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How to define and Sigma Delta Converter comparator gain?

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schwang1970

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Hi, ALL
Did anyone know how to define the Sigma Delta converter's comparator gain
and simulation it by Hspice in differential mode?
Thank you!
 

I think it's the same way u define any other gain...you draw a line that defines the input-output relationship and find the slope of that line.
 

I think after finding the SNR you can find the conversion gain by reducing the noise level in your bandwidth from the signal gain.
 

ok，if your circuit comparator outputs diff +3.3 or -3.3 for 1 and-1 then ,the gain is 3.3, so when feedback this to dac, you should take account it

on the other hand,in digital would if you see 3.3v for 1 and -3.3v for -1, then 1/3.3 as gain is automatically added

jowong1 didn't say clearly ,but the fact is you say how gainy is ,than you can do how gainy is

so
 

in the comparator circuit,use ac in input and run ac analysis.plot output with bode plot.
this way is same way for amplifier gain.
 

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