PCB Designing Guidelines
Hi Friends,
Today we discuss important PCB DESIGN GUIDELINES.There are many things need to be taken care while PCB design.Some of them are as-
1.While starting component placement on the PCB,first Place main components like micro controller,Processor,Memory and Clock devices and then place the support components like resistors,capacitors around them.Means place the active component first and then place passive components.
2.Isolate the Analog,digital and power supply section.The analog supply should be noise and ripple free.If we use same supply for analog and digital then it would cause de-functioning of the circuit.If you are not able to use different power supply source then at least use proper filtering technique.
3. Arrange components in rows and columns and oriented uniformly for ease of installation,inspection and rework.
4. Don't place routes under transformers and EMI chokes.Keep at least 200ml clearance from the transformer to other components.
5. Don't route any other signal near the crystal,oscillator and resonator.There should be atleast 3W spacing between the clock signals and other signals.
6. Place decoupling capacitors close as much as possible to Vcc pin on active components.
7. High frequency circuit design requires careful grounding.The ground in a circuit is supposed to be at same potential,but in reality it is not.To minimize these voltage differences,use ground plane.
8. Minimize areas and lengths of the loops which contain high frequency switching currents.
9. Don't use the traces at right angles,they are a common point of failure when the board is being routed.Instead use track at an angle of 45 degrees.
10. Use oval shaped solder pads instead of circular pads to ease soldering.
11. Minimum track width depends on the copper thickness as well as current requirement.For low power circuits 12 mil is the minimum trace width for DIY method of PCB design.
Today we discuss important PCB DESIGN GUIDELINES.There are many things need to be taken care while PCB design.Some of them are as-
1.While starting component placement on the PCB,first Place main components like micro controller,Processor,Memory and Clock devices and then place the support components like resistors,capacitors around them.Means place the active component first and then place passive components.
2.Isolate the Analog,digital and power supply section.The analog supply should be noise and ripple free.If we use same supply for analog and digital then it would cause de-functioning of the circuit.If you are not able to use different power supply source then at least use proper filtering technique.
3. Arrange components in rows and columns and oriented uniformly for ease of installation,inspection and rework.
5. Don't route any other signal near the crystal,oscillator and resonator.There should be atleast 3W spacing between the clock signals and other signals.
6. Place decoupling capacitors close as much as possible to Vcc pin on active components.
7. High frequency circuit design requires careful grounding.The ground in a circuit is supposed to be at same potential,but in reality it is not.To minimize these voltage differences,use ground plane.
8. Minimize areas and lengths of the loops which contain high frequency switching currents.
9. Don't use the traces at right angles,they are a common point of failure when the board is being routed.Instead use track at an angle of 45 degrees.
10. Use oval shaped solder pads instead of circular pads to ease soldering.
11. Minimum track width depends on the copper thickness as well as current requirement.For low power circuits 12 mil is the minimum trace width for DIY method of PCB design.
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