Difference between revisions of "PCB Design Interview Questions"
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=====What is need for a PCB?===== | =====What is need for a PCB?===== | ||
*Designs on bread boards or perf boards are cumbersome, to have neat placement of components without jumpers or wires a PCB is designed. It also helps in providing physical stability and overall circuit is more reliable. | *Designs on bread boards or perf boards are cumbersome, to have neat placement of components without jumpers or wires a PCB is designed. It also helps in providing physical stability and overall circuit is more reliable. | ||
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*Oscillator circuit: Ensure oscillator is placed near to MCU pins. Distance depends on specific MCU. It is done so that MCU receives stable oscillations without noise. | *Oscillator circuit: Ensure oscillator is placed near to MCU pins. Distance depends on specific MCU. It is done so that MCU receives stable oscillations without noise. | ||
=====What are basic checks for RF design?===== | =====What are basic checks for RF design?===== | ||
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=====What are units for measuring footprints?===== | =====What are units for measuring footprints?===== | ||
*Millimeter: SMD components | *Millimeter: SMD components | ||
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=====Why is it used?===== | =====Why is it used?===== | ||
The dimensions of most of the through hole components are in mils. e.g pitch between IC pins(100 mils), Width of ICs (300 mil, 600 mil) etc. Hence if measurement of these in mm will not round figures. | The dimensions of most of the through hole components are in mils. e.g pitch between IC pins(100 mils), Width of ICs (300 mil, 600 mil) etc. Hence if measurement of these in mm will not round figures. | ||
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=====We use the form below to verify our PCB design, answering them would give you a good idea of what the interview for?===== | =====We use the form below to verify our PCB design, answering them would give you a good idea of what the interview for?===== | ||
{{#widget:Iframe|url=https://docs.google.com/forms/d/1r1SKhGSUyOvHcarxYyzDa1V1Tr2iMA67j6aupjamXEY/viewform?usp=send_form|width=680|height=400|border=0}} | {{#widget:Iframe|url=https://docs.google.com/forms/d/1r1SKhGSUyOvHcarxYyzDa1V1Tr2iMA67j6aupjamXEY/viewform?usp=send_form|width=680|height=400|border=0}} | ||
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Latest revision as of 06:22, 4 July 2014
Contents
- 1 What is need for a PCB?
- 2 What software or EDA tools are you familiar with?
- 3 What if schematic symbols and footprints are not available in component library?
- 4 How do you verify schematic symbols or footprints?
- 5 What are basic checks while laying out MCU based design
- 6 What are basic checks for RF design?
- 7 What are units for measuring footprints?
- 8 What is Mil?
- 9 Why is it used?
- 10 We use the form below to verify our PCB design, answering them would give you a good idea of what the interview for?
What is need for a PCB?
- Designs on bread boards or perf boards are cumbersome, to have neat placement of components without jumpers or wires a PCB is designed. It also helps in providing physical stability and overall circuit is more reliable.
What software or EDA tools are you familiar with?
What if schematic symbols and footprints are not available in component library?
- Create them!
How do you verify schematic symbols or footprints?
- cross verify with datasheets, print footprints and match with actual devices before production.
What are basic checks while laying out MCU based design
- Power path:Ensure that the power flow tracks have sufficient trace width.
- Oscillator circuit: Ensure oscillator is placed near to MCU pins. Distance depends on specific MCU. It is done so that MCU receives stable oscillations without noise.
What are basic checks for RF design?
What are units for measuring footprints?
- Millimeter: SMD components
- Mils:Through hole
What is Mil?
- 1 mil is 1/1000 inch.
Why is it used?
The dimensions of most of the through hole components are in mils. e.g pitch between IC pins(100 mils), Width of ICs (300 mil, 600 mil) etc. Hence if measurement of these in mm will not round figures.
We use the form below to verify our PCB design, answering them would give you a good idea of what the interview for?
{{#widget:Iframe|url=https://docs.google.com/forms/d/1r1SKhGSUyOvHcarxYyzDa1V1Tr2iMA67j6aupjamXEY/viewform?usp=send_form%7Cwidth=680%7Cheight=400%7Cborder=0}}