Tag Archives: Printed Circuit Board

PC Board Debugging & Troubleshoot Guidelines

PC Board Debugging & Troubleshoot Guidelines

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Engineers have to test the PCB thoroughly to see if it’s functional and fulfills its purpose of design. But, some manufacturers don’t do it which leads to intermittent issues or PCB failure, and such issues are hard to deal with while debugging. Whereas it becomes a disaster if a PCB fails in the field. You can avoid PCB issues by testing it thoroughly, besides it should be built by a good manufacturer. First, you should know the basic troubleshooting methods, so let’s begin.

Basic PCB Troubleshooting and Debugging

PCB of a printed circuit board has copper traces and insulators to connect heavy components to develop an advanced circuit. It is a great challenge to troubleshoot a circuit board in terms of thickness, size, signals, layers, and the types of different components as they are all very important.
Some circuit boards are simple and don’t need a deep inspection, but there are also complex PCB designs that need special tools for troubleshooting. Generally, the basic test is easy to do through ordinary equipment to assess the currents, traces, and signals on the PC Board.

Choosing the Right Tools

Simple troubleshooting of a Printed Circuit Board involves a few tools, such as a multimeter which is quite common. But, deep troubleshooting of complex boards depends on high-end tools, especially if the problem is big. Like, you will have to use the oscilloscope, an LCR meter, a logic analyzer, and the power supply to assess a circuit board’s response in terms of function.

A Visual Inspection

Initially, you have to test your circuit board visually to see some obvious issues, such as overheating, overlapping of traces, burnt or damaged components, as well as the missing parts of a PCB. You can detect the burnt components through smell as they are not easy to detect otherwise. PCB components often get burnt due to overheating or excessive current. Sometimes the components bulge due to high temperature or heat which helps you identify the damage, like in the case of electrolytic capacitors.

PC Board Debugging & Troubleshoot Guidelines
PC Board Debugging & Troubleshoot Guidelines

Physical Testing

After visual inspection of your PCB comes the physical testing by applying the power to the board. You can easily find hot spots on the circuit board by touching its surface. So, you don’t need a costly thermographic camera to find heated areas. After finding the hot parts, you should cool them with compressed air to see how PCB components function at low temperatures.

How To Troubleshoot Or Debug A PCB Deeply

Experts use four techniques for PCB tests which come up with both pros and cons. Some common methods are ICT, cable scan, flying probe, and a functional test, so let’s study them one by one.

1: The Flying Probe Technique

This method of PCB troubleshooting involves multiple probes that check the PCB by flying around. Like, there are two to six probes in this case. This technique is ideal for large circuit boards, like backplanes. It is also cheaper than the ICT, and it debugs the pcb assembly issues that occur due to poor solder connections. The flying probe also checks components’ presence and their polarities and different values. It is a simple test and can handle the revisions of a PCB.

Cons of The Flying Probe

The flying probe techniques have some flaws in terms of PCB functionality testing, unlike ICT. The flying probe also works slowly compared to ICT because several probes contact the entire PCB testing points. However, it is ideal for low volume PCBs and its total cost is also lower than other techniques.

2: ICT Or In-Circuit For PCB Troubleshoot

The ICT is a PCB testing technique that involves multiple probes which are also called the bed of nails. In this process, the ICT probes connect with the testing points of the entire PCB to check its circuits to see if the assembly is correct or wrong. Like, it tests the bad solder joints or short circuits.

This method can perform even a deeper test by adding other modules or adapters to it. ICT also tests the overall function of PCB and values of the critical components.

Cons Of ICT

Though ICT is a great tool for PCB testing, it has some disadvantages too. Like, it has costly fixtures ranging from $8000, and they go up to $ 15000. Besides, the cost increases with any changes in the technique.

You can have maximum benefits from ICT if the technician knows the testing software and other tools. ICT is the best method for large volume testing.

3: The CableScan

Another troubleshooting technique is the cablescan, which is ideal for PCBs with several connectors having a complicated interface, like the backplanes. The tester attaches the cablescan with the circuit board and it tests all the pins against each other to evaluate the assembly issues, like a solder opening or shorts.

Cablescan also helps check jumpers’ configuration and quality of the diode, besides, it also accesses the capacitance and resistance.

Cons Of Cablescan

There are some flaws with cablescan due to its limits. Like, you have to see the size of the connectors it can test in one go. Moreover, it involves an additional cost to create the hardware interface.

You have to get wetting connectors, but their wiring with the system gets delayed due to the cost or other issues. The cablescan technique and its setup take lots of time, depending on the number of connectors and their complexity.

4: Functional Testing Technique

Another essential thing is to see if a PCB is ready to function or not. The functional test consists of test probes, software, and connected cables, and it determines PCB behavior according to design specifications.

The CM can also create the hardware and software or test fixtures to test the PCB function. This process is ideal for simple and small PCB layout designs. The engineers also develop fixtures for a bench test and make a plan to target the assembly issues involving less time and cost to assess the components. The functional test also helps see if the entire circuitry is working as you want. However, you need detailed debugging to find different faults and remove them.

Role of Engineers and Technicians In PCB Troubleshooting

You need experienced people to troubleshoot a PCB, such as engineers and technicians. Besides, these experts should know how to use the testing tools. Like, in the case of ICT, the engineer should know how to test the semiconductor. He should also know the DFT, end-user applications, as well as ICT optimization. The knowledge of hardware and software development is equally important.

When it comes to the cablescan, the troubleshoot company should have a huge inventory of already built connector interfaces. You can reduce the development cost and time by having all resources in hand.

Likewise, the technicians should debug with a flying probe according to the circuit board. In other words, the testing method should be compatible with the PCB design.

Most engineers use the LabView for a functional test, as it works according to the frequencies, variable supply levels, and several other PCB requirements. Such a deep examination of the PCB involves less amount of hardware, unlike surface-level testing.
Both basic and deep troubleshooting methods help you to find the right PCB issues, leading to an effective product by removing those issues.

Frequently Asked Questions

What Is ICT In PCB Troubleshooting?
ICT is a PCB testing technique that involves multiple probes which are also called the bed of nails. The ICT probes connect with the testing points of the entire PCB to check its circuits to see if the assembly is correct or wrong.
What Is The Flying Probe In PCB Debugging?
This method of PCB troubleshooting involves multiple probes that check the PCB by flying around. There are two to six probes in this case. This technique is ideal for large circuit boards, like backplanes. It debugs the assembly issues that occur due to poor solder connections.

What Is The Role Of A Functional Test In PCB?
The functional test consists of test probes, software, and connected cables, and it determines PCB behavior according to design specifications. The functional test also helps see if the entire circuitry is working as you want.
Is Basic Troubleshooting Enough For Circuit Boards?
No, the basic testing involves only visual and physical tests at basic levels. You need deep testing with specific tools, especially for complicated circuits.

Final Thoughts

PCB of a printed circuit board has copper traces and insulators to connect heavy components to develop an advanced circuit. It is a great challenge to troubleshoot a circuit board in terms of thickness, size, signals, layers, and the types of different components as they are all very important.
Some circuit boards are simple and don’t need a deep inspection, but there are also complex PCB designs that need special tools for troubleshooting. Generally, the basic test is easy to do through ordinary equipment to assess the currents, traces, and signals on the PCB. Whereas deep troubleshooting involves different techniques.
Would like to know more about PCB debugging, troubleshooting printed circuit board assembly? Email us at sales@pnconline.com

Identify SMT Components Polarity on a PC Board

Identify SMT Components Polarity on a PC Board

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The design of PCB and its assembly involves different components. The smart era has resulted in a compact PCB design and the components’ polarity is hard to identify now. Here, we will see how to recognize the polarity of the SMT components to avoid its reversal during production, ensure a correct PCB, and enhance the quality of engineers’ knowledge regarding the polarized components’ direction.

Understand the Polarity of Components In PCB?

The polarity of SMT components is the position of the SMT components’ first pin or it’s the direction of the component. In other words, when you mount a component during the SMT assembly process, it should be installed in a specific direction and that is polarity.
You have to make sure that both negative and positive poles of the components are connected to the circuit board. If the components’ direction is wrong while mounting, it would result in a blocked circuit, causing a short circuit. Moreover, the body of the component gets burned and the circuit does not function correctly due to wrong placement.

Polar Components and Their Type

PCB has several SMT components having polarity, such as
• Shaped capacitors
• Transistors
• Diodes
• Field effect tube
• IC integrated circuit
• Coil
• Crystal oscillator
• Transformer
• Shielding frame
• Row socket

All these connectors have different symbols, however, there are also several other types of components.

Marking of Polar Components

Components with polarity have specific marks that show the direction of both poles or the direction of the components’ first pin. The two-pin components have mostly positive and negative marks. Whereas in the case of multi-pin components, the mark is the placement of the components’ first pin.

The poor reverse happens if the circuit board has polar components with the wrong polarity. Reverse components are not suitable in terms of Printed Circuit Board function even their mounting and soldering are fine on the board pad. This issue can also burn the PCBA while testing it, making the board less functional.

You have to identify the SMT components’ polarity considering a few things

Identifying The Body Polarity of The Component

It is the position or direction of components’ positive and negative poles. You can also say that it is the first pin of the part marked on the component body.

Identifying the Component Polarity in The Circuit

• It is the position or direction of the positive and negative poles of electronic components. It can also be the direction of the first pin in the circuit.
• Another thing to consider is the mounting of the electronic components on the PCB. Whereas the component body’s polarity corresponds to the circuit’s polarity.

PCB has electronic components mounted on it through surface mount technology. The component body’s polarity corresponds to the circuit’s required polarity.

Printed circuit boards made by SMT are getting more integrated with precise components layout. Moreover, the components are getting smaller than before due to smart PCBs.

In mobile phones’ motherboards, you won’t find any components. So, you can’t identify the components’ polarity intuitively. In such products, the components tag map is used to create a material release map to identify the polarity, and the location specification to help quality personnel ensure the first piece which also becomes a sample for testing. This test ensures a flawless identification of the component polarity.

Identifying the Capacitor Polarity

• The chip resistors have no polarity.
• The ceramic capacitor is non-polarized.
• Polarity of the tantalum capacitors is determined by positive and color band marking of the components on PCB and diagonal marking.
• The capacitance and electrolysis of aluminum come up with polarity. The color band of components shows a negative marking. Whereas the PCB mark is positive.

Identifying the Inductor Polarity

• There is no need to identify the polarity for a chip coil package and welding areas.
• There are polarity requirements for multi-pin inductors. The polarity point is indicated by dot/1. Whereas the PCB mark is indicated by dot /circle / “*” for the polarity point.

Identifying the Diode Polarity

The surface-mounted LED in PCB has polarity. The components’ negative polarity is indicated by green. Whereas PCB’s negative polarity is indicated by the vertical bar, color band, and silk screen’s sharp corner.

Identifying the IC Polarity

• You can identify the polarity of the integrated circuit through SOIC packaging. It is indicated as a color band, groove, symbol, concave point, and bevel.

• The polarity of the SOP and QFP packaging is indicated by groove, concave, and two different points.

• The polarity of the QFN packaging is indicated by a beveled edge to the marking, a symbol like a horizontal bar, and two different points in terms of size and shape.

Identifying the Polarity of Ball Grid Array, BGA

In this case, the component polarity is indicated by a dot, concave point, groove, and a circle mark. Whereas the PCB polarity is indicated by dot, circle, and diagonal to mark. Moreover, the components’ polarity point corresponds to PCB’s polarity point.

Things To Consider In PCB Manufacturing For Components Direction

PCB assembly gets wrong if the components are not compatible with their orientation. However, certain warning signs regarding the PCB design guidelines can help in this case. The manufacturer has to consider a few things while reviewing a PCB design, such as:

Quality of design: the CM can enhance PCB production by finding the defective parts during assembly and replacing them with the right material or parts.

Standard assembly: PCB design should be compatible with assembly and the CM can ensure low-cost manufacturing by reducing the time and labor.

Assembly issues: the CM can also enhance PCB production by removing the potential assembly problems. This can also reduce the overall assembly cost due to reduced time and labor.

Thermal performance: certain components have to be positioned at a certain angle to enhance the airflow around the circuit board. This step keeps the parts cool and effective.

PCB going through a solder reflow also has issues with components orientation. Sometimes, the passive parts are placed together to connect all the pins to one power bus. When the direction of such components is unable to change, the power bus connection should be through a thin trace to remove the large metal areas that flood the pin.

The passive components having irregular metal connections between two pins might be vulnerable to floating on the pad surface or can cause tombstoning in solder reflow.

The direction of the parts is also a concern if they lie on PCB edges. In the case of V-groove scoring, the direction and placement of the components should allow some space for the scoring tool to work. It helps to remove the defects in PCB and the parts also stay safe. Moreover, you should also consider the direction of the components in terms of their function.

Identify SMT Components Polarity on a PC Board
Identify SMT Components Polarity on a PC Board

Frequently Asked Questions

What Is SMT Component Polarity In PCB?
The polarity of SMT components is the position of the SMT components’ first pin or it’s the direction of the component. When you mount a component through SMT, it should be installed in a specific direction and that is polarity.
What is SOP in PCB?
SOP means the small outline package that is an IC package of SMT.

What is QFP in PCB?
QFP in PCB means the quad flat package and it is also an integrated package for surface mounting.
What is QFN in PCB?
QFN in PCB means the quad flat no-lead package and it is leadless, small, and provides heat dissipation in PCB.
What are some SMT components with polarity?
PCB has several SMT components having the polarity, such as shaped capacitors transistors, diodes, field-effect tube, IC integrated circuit, coil, crystal oscillator, transformer, shielding frame, and the row socket.

Final Thoughts

The polarity of SMT components is the position of the SMT components’ first pin or it’s the direction of the component. In other words, when you mount a component through SMT, it should be installed in a specific direction and that is polarity.
You have to make sure that both negative and positive poles of the components are connected to the circuit board. If the components’ direction is wrong while mounting, it would result in a blocked circuit, causing a short circuit. Moreover, the body of the component gets burned and the circuit does not function correctly due to wrong placement.
Components with polarity have specific marks that show the direction of both poles or the direction of the components’ first pin. The two-pin components have mostly positive and negative marks. Whereas in the case of multi-pin components, the mark is the placement of the components’ first pin.

The poor reverse happens if the circuit board has polar components with the wrong polarity. Reverse components are not suitable in terms of PCB function even their mounting and soldering are fine on the board pad. This issue can also burn the PCBA while testing it, making the board less functional.

Would like to know more about SMT Components or pcb assembly? Email us at sales@pnconline.com

PCB Design

DFM Issues in PCB Design

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You need a well-designed PCB for the effective functioning of the device, and you can have it by focusing on the DFM or Design for Manufacturing. Different requirements are there in terms of PCB design, management, and fabrication that you have to follow. At the same time, you should consider the timeline to have a circuit board within your budget.

PCB and DFM Issues

Having well-executed CAD tools is easy, but these tools cause certain DFM issues which need lots of effort to solve. Sometimes a PCB is correct in terms of electrical requirements, but it is hard to manufacture because you don’t focus on the design layout. The layout issues stay hidden, making it hard for you to assemble a PCB, besides the testing also becomes difficult.
However, you can overcome the DFM problems if you understand the entire process of manufacturing. Now, we will discuss a few DFM issues, including tolerances, acid traps, SMD issues like open vias and uneven connections, a wrong opening of the solder mask, and the violation of standards.
Once you know these problems, it becomes easier for you to resolve them and have an easy fabrication that involves less time to review the design. So, let’s discuss the DFM issues one by one and find their solutions to have the best device.

Connection Issues On The SMD Pads

The connections on the SMD pads often become uneven as components are so small and hard to handle. These connections should be even to avoid the tombstoning while soldering reflow. Likewise, this rule also applies to the BGA pads for precise soldering. In other words, you should place a compatible pad according to the footprints of the components, so the size of the pad matters a lot. Generally, the pad sizes are standard for common components.
The designer can easily check the pad sizes without exporting the Gerber files, like through a 3D, as the manufacturer won’t do this for you. Manufacturers only see the Gerber files to compare the sizes of the components’ in the BOQ.
You also need testing after PCB fabrication to make sure that the connection is even and it involves deep inspection like an X-ray. So, the designer should inspect the footprints to see if they are according to the lead size of the component.

A Wrong Solder Mask Opening

The term solder mask or solder aperture is an opening that helps the solder stay intact on the SMD pads while soldering, be it the wave or hand soldering. A solder ball develops on the pad while soldering which can collapse if it’s too large, moving around at high temperatures. Designers leave a small opening in the solder mask to keep the solder ball intact while soldering, even if the ball is too large. This technique also works in the BGA where a solder dam develops when the mask hinders the pad from circuit board’s via.
You can eliminate this issue by creating the footprints of the components having a proper solder mask opening which often crosses the pad edges about 4 to 5 mils. When the solder aperture is very large, it is not able to block the flow of a solder ball while wave soldering.

Open Via Issues In The SMD Pad

The designer should not give via-in-pad in the PCB. When you place a through-hole via very near to the soldering area, it causes the solder to move through a circuit board’s back. When via is attached to the internal layer’s large plane, it will cause the heat dissipation into that plane. So, it results in tombstoning during pcb assembly.
Though the via-in-pad has a great role in the HDI PCB having BGAs with a fine pitch, it should be avoided in smart circuit boards. You should insert plated-over vias for small boards to avoid the heat dissipation that occurs during soldering and also makes via the connection for thermal relief.

PCB Design
DFM Issues in PCB Design

Understanding the Acid Traps

Printed circuit boards consist of various copper images. Engineers remove extra copper from the laminate with the help of chemicals that sometimes get trapped in a PCB with narrow corners, and this is called an acid trap. This process results in rough copper, damaging the PCB.

There is a way to avoid the acid traps by using low-viscosity chemicals. Acid traps also happen when the routing is done at 90 degrees, so beware of the solution that a PCB manufacturer uses, in this case, to see if it is causing acid traps. The best practice is to route the traces at 45 degrees to avoid the acid traps.

Design Tolerances

PCB design depends on precise parameters and tolerances and you have to maintain them. If you don’t use specific design requirements, the routing tools will create any tolerance. You should keep traces at some distance from other traces, from pads, and from the copper pours. The clearances help in etching and leave a space for manufacturing clearances.
These tolerances are also essential in high voltage layouts. According to the IPC 2221 standards, the difference between conductive elements determines the minimum clearance between the conductor and a trace. The purpose is to avoid the unintended ESD or, conductive filamentation in the case of adjacent conductors, and electrochemical corrosion.

IPC Standards and Their Violation

There are unlimited IPC standards that you have to follow for a reliable PCB. Such standards are regarding tolerances, the annular ring size of the via as per aspect ratio, teardrops on vias and pads, land patterns, sizes of micro vias, trace width as per current, and high temperatures.
Some manufacturers check the Gerber files and testing rules to see if you have violated any standards. Generally, the IPC standards are not mandatory, unlike high-end industries, but following them makes a Printed Circuit Board more reliable.

Accessing The DFM Issues Through PCB Design Software

The above DFM issues are the common ones in PCB manufacturing, but there are several other issues. If you manage all the design rules, you and your manufacturer would end up with a reliable PCB. You need the right software to create a rules-based PCB, avoiding the DFM issues.

Frequently Asked Questions

What Is DFM In A PCB?
DFM is Design for Manufacturing which means you have to have a special layout design for a PCB to be manufactured correctly. You will have to face many issues if there is no DFM.
How to Check the DFM Issues?
There are certain PCB testing tools to check the data set, finding issues that can delay the manufacturing. Many online platforms also offer DFM testing tools.
What is SMD in a PCB Design?
SMD stands for Surface Mount Device, and SMD components are parts being soldered to the PCB by using the surface mount technique. There are several types of SMD components having different forms.
What is BGA in a PCB Design?
BGA means a ball grid array, and it’s a surface mount technique for integrated circuits. It helps mount devices permanently, like in microprocessors.
What are PCB Tolerances?
PCB design depends on precise parameters and tolerances, and you have to maintain them. If you don’t use the specific design requirements, the routing tools will create any tolerance. You should keep traces at some distance from other traces, from pads, and from the copper pours. The clearances help in etching and leave a space for manufacturing clearances.
What Are IPC Standards in PCB?
There are unlimited IPC standards that you have to follow for a reliable PCB. Such standards are regarding tolerances, the annular ring size of the via as per aspect ratio, teardrops on vias and pads, land patterns, sizes of micro vias, trace width as per current, and high temperatures.

Final Thoughts

Having well-executed CAD tools is easy, but these tools cause certain DFM issues which need lots of effort to solve. Sometimes a PCB is correct in terms of electrical requirements, but it is hard to manufacture because you don’t focus on the design layout. The layout issues stay hidden, making it hard for you to assemble a PCB, besides the testing also becomes difficult.
However, you can overcome the DFM problems if you understand the entire process of manufacturing. Now, we will discuss a few DFM issues, including tolerances, acid traps, SMD issues like open vias and uneven connections, a wrong opening of the solder mask, and the violation of standards.
There are several DFM issues, and if you manage all the design rules, you and your manufacturer would end up with a reliable PCB. You need the right software to create a rules-based PCB, avoiding the DFM issues.
Contact us at sales@pnconline.com to know more about DFM issues or pcb assembly services.

PCB Design

Possible Problems & Solutions in a PCB Design Process

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Whatever electronic and digital device you have, it depends on a printed circuit board for signals transmission to help it operate. These devices need a well-designed structure and manufacturing, but you have to encounter many issues in this case that we will discuss here.
Any issue in the design of a PCB would cause delays in its manufacturing, so you must know how to avoid them. Similarly, some problems happen before the design that designers can avoid through proper strategies.

PCB Issues before Its Design

The designer should consider certain steps for a successful design, such as project management and its timeline. You should allocate the project resources and time like there should be enough time to edit your design according to the rules. Sometimes the designers miss certain schedules in a hurry, delivering an incomplete design having many errors.
The designer should be an expert in using the latest design tools. You must have a complete library of CAD materials and should also know the basic design rules. Though these steps look minor, they should be in hand before starting a PCB layout. Now, we will discuss some common PC design issues, so let’s begin.

Component Problems

Sometimes the designers choose the wrong components just to speed up the process, but it can affect a circuit board’s effectiveness. Designers often go for an existing circuitry or select an old and familiar library as it’s convenient for them. But, it becomes a problem when such components or parts are not feasible due to their price or they are not available. So, the designers should be well-informed in terms of design libraries and should choose the Printed Circuit Board parts wisely.

Issues with Physical Parameters

The designers often choose familiar things related to materials, board layout, and outline, as well as the stack-up for layers. However, the prices of such materials may change, besides, their availability can also become an issue. Such changes can affect the design rules according to a different substrate. Likewise, the outline of the PCB also changes due to the design and fabrication limits. So, the designer should discuss all design parameters with their manufacturer before designing the layout.

Locating the PCB Components

A PCB has different components and their footprints should be well-placed on a PCB for precise manufacturing, and it’s called the DFM or Design for Manufacturing for a circuit board manufacturer. If you ignore the DFM, it would result in a high-cost and less effective PCB.
There are certain DFM rules to follow in terms of distance between the components and the circuit board’s edges, the distance between different components, and spacing between various features of the board and components.
There should be enough space around the test points to help a circuit board get tested automatically. You should also consider the placement of the parts that get hot as it can result in thermal issues, affecting a PCB’s performance. Moreover, the high-frequency components should be located in such a way as to have powerful signals.

Routing Issues of Traces

Another PCB design issue is regarding the incorrect trace routing. Like, the widths of the traces and their distance should be correct. The designer should discuss these parameters with their manufacturers to have a precise trace width. Moreover, the weight of the copper should also be correct for perfect routing.
At the same time, the designers should input these values into the design rules while working through CAD. By having well-planed rules and design limits, you can avoid issues regarding a controlled impedance or routing. You can also reduce the burning of traces that occurs due to a lack of copper in case of high currents. You can also eliminate poor signals, and poor copper balancing that happens on the layers of a PCB.
Similarly, the issue of the thin high-voltage traces is also there. Sometimes the trace of a circuit board needs a high voltage that a small trace of less width can’t handle. So, you must calculate the trace width through PCB software, like CAD which has a width calculator for PCB traces.
The designer also has to consider the suitable rise in the temperature for certain traces that helps them to evaluate the current capacity of the trace to choose a compatible copper weight
Moreover, you need high-frequency routing for high-speed signals. Trace routing is not an issue in the case of microcontroller PCBs because they do not need high-speed signals. But, the trace paths need attention for the high-frequency circuit boards because of the address bus and external data.

PCB Design
Possible Problems & Solutions in a PCB Design

Ground Planes and Power Issues

Most designers ignore a network that delivers the power and sometimes they don’t even think about it. If you don’t have a well-designed ground, it would result in poor signals with the noise and EMI emissions. So, the designer should focus on these issues with proper planning after discussing them with the manufacturer. You should know the precise configuration and planes’ location in the layer stack of a PC BOARD.
The design of the ground planes is important to avoid the blockage of signals’ return paths. Moreover, you can also control the interference of the ground and analog with each other by considering these points. Both ground and analog are different in terms of circuitry.
The electric devices involve the linear and switching regulators in terms of voltage. There is low energy by linear regulators, but they are less costly and many PCB designers use them for this reason. But, the linear regulators are not easy for low-noise applications that use high power.
Whereas the switching regulators involve more complicated designs than linear regulators. They are effective in terms of energy, but they need a detailed design for a PCB. So, you have to be careful in this case and should follow the datasheet rules strictly.

System Design Issue

A PCB is just a part of a large electronic device having a specific system that a designer has to consider. However, most designers focus on just the design of a circuit board. Such ignorance can cause several issues during the PCB assembly, such as incompatible wires and board connectors, inaccessible human interfaces or switches, and the lack of space for repair or system debugging. So, the electrical engineers should focus on the design of the full system instead of just a circuit board.

Wrong Usage of Decoupling Capacitors

The electrical parts of a circuit board need stable electricity without interruption. The hardware of a PCB involves decoupling capacitors for stable voltage and this decoupling happens on the rail that supplies the power. You must place the decoupling capacitors close to the pin for maximum and stable current to help it pass through the decoupling capacitors before it reaches the pin.
All these issues are technical that affect the hardware of circuit boards. You must solve these issues to have an effective and functioning product or device.

How to Find the Design Resources for PCB

You can avoid or eliminate the above problems by accessing suitable design resources. You can easily find them online from different companies that offer PCB design, manufacturing, and also provide calculators to calculate specific design parameters. Such companies also offer PCB design and manufacturing services other than just guiding you in a PCB design.

Frequently Asked Questions

What Is Meant By PCB?
PCB is an abbreviation of Printed Circuit Board. It is used in electrical devices to provide them with signals or current to operate. Printed circuit boards are used in different industries, including networking, electronics industry, gadgets, aerospace, and much more.
What Is DFM In A PCB?
DFM is Design for Manufacturing which means you have to have a special layout design for a PCB to be manufactured correctly. You will have to face many issues if there is no DFM.
What Are PCB Design Issues?
PCB design involves different issues regarding its components, power supply, routing, design parameters, decoupling of capacitors, layers stuck-up, copper weight, etc.

Final Thoughts

Any issue in the design of a PCB would cause delays in its manufacturing, so you must know how to avoid them. PCB design involves different issues regarding its components, power supply, routing, design parameters, decoupling of capacitors, layers stuck-up, copper weight, etc.
The designer should consider certain steps for a successful PCB design, such as project management and its timeline. You should allocate the project resources and time like there should be enough time to edit your design according to the rules. Sometimes the designers miss certain schedules in a hurry, delivering an incomplete design having many errors.
All these issues are technical that affect the hardware of circuit boards. You must solve these issues to have an effective and functioning product or device. You can avoid or eliminate the above problems by accessing suitable design resources. You can easily find them online from different companies that offer PCB design, manufacturing, and also provide calculators to calculate specific design parameters.
Would like to know more about the PCB design process or PC Board assembly? Email us at sales@pnconline.com

Significance of Copper Coating in PCB Design

Significance of Copper Coating in PCB Design

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Printed circuit boards have a certain unused area, which is coated with copper known as copper coating or filling. There are several benefits of copper coating and one of them is to minimize the impedance of ground wire, as well as enhance the anti-interference and power supply, and minimize the voltage droppings.
The copper coating also helps prevent the deformation of a PCB during soldering. However, you have to manage copper coating properly to avoid certain issues that we will discuss here and find ways to resolve.

PCB has wirings distributed capacitance regarding high frequencies. The designer knows that when the length is higher than 1/20 of the corresponding wavelength of the noise frequency, it will cause the antenna effect causing the noise emission through wiring. Poor grounding of copper results in noise, so the ground line should have a hole with a pitch that is lower than λ/20 to have a good grounding on a multi-layered Printed Circuit Board.

The grid has traces in multiple directions and the trace width comes up with a corresponding electrical length to help a PCB operate. If the operating frequency is low, the gridline becomes less effective. But, the electrical length compatible with a PCB’s operating frequency causes bad effects and the PCB stops working transmitting the signals somewhere else.

High-frequency PCB resists a multi-purpose grid having high-interference requirements. On the other hand, the low-frequency PCB comes up with a wide current circuit and the designers use it for copper plating.
The grid should be compatible with the PC design, otherwise, the signals get scattered interfering with the entire system. The high-frequency PCB should have a high multi-purpose grid, and low-frequency PCB involves copper laying.

There are two methods of copper coating known as grid copper and large-area coating. In a large-area copper coating, bubbles develop due to wave soldering. In large-area coating, some slots are opened and the foaming of the copper foil is alleviated. Whereas the grid coating provides shielding to reduce heat dissipation, and it also provides electromagnetic shielding.

  • Sometimes the PCB has several grounds, including GND, AGND, and SGND. The main surface of a circuit board becomes a reference to use copper plating, or as a digital or analog ground. However, copper pouring does not need to be separated. Moreover, the designer has to increase the thickness of the power connections, such as 3.3V and 5.0V which helps make different deformed surfaces having different shapes.
  • When it is about different grounds single-point connection, the process involves a connection through magnetic beads or 0-ohm resistors.
  • You also have to take care of copper coating in areas adjacent to the crystal oscillator, which is a source of high-frequency emission. The basic technique is to shield a copper coating of the crystal oscillator and ground it separately.
  • There is another issue of a dead zone, also known as the Island. However, you can reduce it by defining a hole.
  • PCB ground should have equal treatment while wiring. You can’t depend on copper coating by adding a hole to remove a pin’s connection, as it would affect the signals badly.
  • The PCB design should not have sharp angles, such as 180 degrees, because they cause a transmitting effect in terms of electromagnetism.
  • The multi-layered PCB’s middle layer has open wiring that should not have copper as it is harder to manage and keep it grounded.
  • You should also properly ground the metal reinforcement and a metal heat sink.
  • You should also properly ground the metal block that causes heat dissipation regarding a three-terminal regulator. The isolation belt of the crystal oscillator should also be grounded properly.

So, you can make a copper coating significant by managing the grounding issues. Such management can reduce the signal path’s backflow issue and also reduce electromagnetic interference.

Many unused surfaces in a PCB are coated with copper known as copper coating or filling. There are several benefits of copper coating and one of them is to minimize the impedance of ground wire, as well as enhance the anti-interference and power supply, and minimize the voltage droppings.

The copper coating also helps prevent the deformation of a PCB during soldering. However, you have to manage copper coating properly to avoid certain issues that we will discuss here and find ways to resolve. PCB has wirings distributed capacitance regarding high frequencies. The designer knows that when the length is higher than 1/20 of the corresponding wavelength of the noise frequency, it will cause the antenna effect causing the noise emission through wiring. Poor grounding of copper results in noise, so the ground line should have a hole with a pitch that is lower than λ/20 to have a good grounding on a multi-layered PCB.

Moreover, the grid has traces in multiple directions and the trace width comes up with a corresponding electrical length to help a PCB operate. If the operating frequency is low, the gridline becomes less effective. But, the electrical length compatible with a PCB’s operating frequency causes bad effects and the PCB stops working transmitting the signals somewhere else.

As you know that high-frequency PCB resists a multi-purpose grid having high-interference requirements. On the other hand, the low-frequency PCB comes up with a wide current circuit and the designers use it for copper plating. The grid should be compatible with the PC design, otherwise, the signals get scattered interfering with the entire system. The high-frequency PC Board should have a high multi-purpose grid, and low-frequency PCB involves copper laying.
There are two methods of copper coating known as grid copper and large-area coating. In a large-area copper coating, bubbles develop due to wave soldering. In large-area coating, some slots are opened and the foaming of the copper foil is alleviated. Whereas the grid coating provides shielding to reduce heat dissipation, and it also provides electromagnetic shielding.

Significance of Copper Coating in PCB Design
Copper Coating in PCB Design

Also, PCB has several grounds, including GND, AGND, and SGND. The main surface of a circuit board becomes a reference to use copper plating, or as a digital or analog ground. However, copper pouring does not need to be separated. Moreover, the designer has to increase the thickness of the power connections, such as 3.3V and 5.0V which helps make different deformed surfaces having different shapes. When it is about different grounds single-point connection, the process involves a connection through magnetic beads or 0-ohm resistors.
Similarly, you must take care of copper coating in areas adjacent to the crystal oscillator, which is a source of high-frequency emission. The basic technique is to shield a copper coating of the crystal oscillator and ground it separately. There is another issue of a dead zone, also known as the Island. However, you can reduce it by defining a hole.

Moreover, the PCB ground should have equal treatment while wiring. You can’t depend on copper coating by adding a hole to remove a pin’s connection, as it would affect the signals badly. The PCB design should not have sharp angles, such as 180 degrees, because they cause a transmitting effect in terms of electromagnetism.
The multi-layered PCB’s middle layer has open wiring that should not have copper as it is harder to manage and keep it grounded. You should also properly ground the metal reinforcement and a metal heat sink. You should also properly ground the metal block that causes heat dissipation regarding a three-terminal regulator. The isolation belt of the crystal oscillator should also be grounded properly.

You can make PCB more effective by applying copper plating the right way. The design of the PCB matters a lot in this case because you need the right tools. Lots of software are there that designers use according to their requirements. You can also get customized PCBs through online platforms by giving your requirements.

At the same time, you need to follow specific design rules, and the fabrication should also be of high quality. Both designer and manufacturer should be experienced to provide the best PCB with correct copper coatings.

Wrap Up

PCB has wirings distributed capacitance regarding high frequencies. The designer knows that when the length is higher than 1/20 of the corresponding wavelength of the noise frequency, it will cause the antenna effect causing the noise emission through wiring. Poor grounding of copper results in noise, so the ground line should have a hole with a pitch that is lower than λ/20 to have a good grounding on a multi-layered PCB. The grid has traces in multiple directions and the trace width comes up with a corresponding electrical length to help a PCB operate. If the operating frequency is low, the gridline becomes less effective. But, the electrical length compatible with a PCB’s operating frequency causes bad effects and the PCB stops working transmitting the signals somewhere else.

High-frequency PCB resists a multi-purpose grid having high-interference requirements. On the other hand, the low-frequency PCB comes up with a wide current circuit and the designers use it for copper plating. The grid should be compatible with the PC design, otherwise, the signals get scattered interfering with the entire system. The high-frequency PCB should have a high multi-purpose grid, and low-frequency PCB involves copper laying.

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