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https://designers-guide.org/forum/YaBB.pl Design >> Mixed-Signal Design >> Op Amp gain required for Sigma-Delta ADC https://designers-guide.org/forum/YaBB.pl?num=1475271217 Message started by Mohammad Ashraful Alam on Sep 30th, 2016, 2:33pm |
Title: Op Amp gain required for Sigma-Delta ADC Post by Mohammad Ashraful Alam on Sep 30th, 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? |
Title: Re: Op Amp gain required for Sigma-Delta ADC Post by jdp on Oct 2nd, 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. |
Title: Re: Op Amp gain required for Sigma-Delta ADC Post by deba on Oct 15th, 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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