How to design a 12bit CMOS sigma-delta ADC?

[staric]

cmos sigma-delta adc

The frequency is 200kHz. Where can find a detail circuit for me to use?

 

[sunking]

muti bit adc with dem technology

 

[extraord]

12bit under 200k hz if the technology is good enough, even 2 or 3 stage sigle bit is enough

 

[piao]

you mean the input frequency or the sampling frequency, be careful about this, this is related to OSR.

you can use the general design methodology about sigma delta modulator. if it is the input frequency, I think 2 stages - single bit one may be a good choice.

 

[echolee79]

i have done a 12bit sigma-delta ADC, i use 2 order

modulator. i think it's enough. maybe you can see

ALLen's book and use matlab make model.

Added after 1 minutes:

And i want to know what's mean 200kHz

the signal frequency or sample frequency?

 

[mists]

for 2 order single bit modulator, must we add dither?

 

[yibinhsieh]

Maybe you can refer the following site:
Yibin.