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What are the design rules for analog PCB, power system and DA/AD converters?

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EDA_hg81

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What are the basic design rules for PCB design of analog circuit? (Anti-current disturbance?)
What are the design rules for power system design? (Below 18 V)
What are the design rules for DA and AD converts selection? ( micro-processor interface and convert accuracy bits selection?)

Thank you.
 

Syukri

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Re: About Analog design

What are the design rules for DA and AD converts selection?

Analog design is an art and science, there is no rule unless to achive your spec(unless for the DRC)...
 

wwfeda

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Re: About Analog design

Books are written on how a good layout should be for analog design. Normally, noise is an important factor and for sensitive signals you should have good grounding layouts. If your circuit board is a mix signal circuit, then you should have separate grounds for the analog signal and digital signal. Digital signal tends to be noisy and if you don't separate it from the analog ground, it will distrupt your analog part.

You don't really have design rules like you have for IC layouts. In case of IC layouts, the rules are set by the manufacturer for their process. You cross the rules, you automatically destroy your circuit.

PCB design is different. You can get good layouts and bad layouts and that doesn't automatically mean your circuit is destroyed. It might just be working badly.

Rules of thumb guides the layout of a PCB board. Some examples are
1. Straight signal traces with bends no more than 45 degrees.
2. Ground and power planes.
3. Put the components as close as possible.
4. Put the noisy part as far from the analog/sensitive part as possible.
5. Bypass all DC points with different values of caps 0.01uF, 0.1uF, 4.7uF and 10uF at power points.
 

    EDA_hg81

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evehits

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