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Op Amp gain required for Sigma-Delta ADC (Read 187 times)
ashrafSazid
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Posts: 5
Germany
Op Amp gain required for Sigma-Delta ADC
Sep 30
th
, 2016, 2:33pm
Hi,
I need help to determine the op amp gain required to match certain ADC specifications. I need to design a delta sigma 14 bit ADC and need to find out required op-amp gain. Is there any certain formula to find out that?
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jdp
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Posts: 42
Re: Op Amp gain required for Sigma-Delta ADC
Reply #1 -
Oct 2
nd
, 2016, 7:11pm
If you search literature, you will frequently see that the opamp gain required is of the order of the OSR or more. Higher the better (like 60-75dB), but minimum is ~ OSR.
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-- jdp
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deba
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Posts: 84
Re: Op Amp gain required for Sigma-Delta ADC
Reply #2 -
Oct 15
th
, 2016, 12:01am
The loop gain required is of the order of (OSR/pi)^n, n is the order of the loop filter. But across corners, to have margin you need to design it for a higher loop gain.
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