want to know the rules for analog PCB design

[EDA_hg81]

want to know the rules for analog PCB design.

 

[rikie_rizza]

What analog design PCB you want to know? Analog signal comm, grounding, adc component positioning, what? be more specific will ya.

 

[EDA_hg81]

Since most PCBs include digital and analog signals.

I want to get some ideas how to define each section for analog and digital parts.

How to layout communication traces between analog chips.

Since the star ground is the best, in most of systems there is one main star and few sub stars, how I should connect signal sub star with main star?

Since every sub star can generate noise which can be coupled to digital signal, how can I avoid this?

Using differential signals? and how to avoid ground loop?

Thanks.

 

[jason99pan]

Maybe you can refer to "Printed Circuit Boards - Design, Fabrication and Assembly", R.S.Khandpur.

Maybe there will have the informations you needed.

Hope it can helpl you...

 

[funnynypd]

Now, there is few pure analog design, most of them are mixtures of both digital and analog.

 

[Iouri]

Digital section on the schematic is digital part on PCB analog is analog.

NO you should have separate ground planes between digital and analog section, AGND and DGND meets under the neath of ADC or CODEC,

if Switching power supply is on the board, use LDO to power up analog section

if "digital" signal needs to travel to analog section ie gain control use optocouplers

Digital traces and analog are not crossing each other

ADC DAC never use same power supply for digal and analog section

and etc..