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CMRR of differential op amp

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tompham

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Hi all

Im checking CMRR of full differential opamp. From what I know CMRR = Ad(dB) - Ac(dB).

I got Ad(dB) = 65dB and Ac(dB) = -27dB ---> CMRR = 92dB?

Ac(dB) < 0 is correct?

Thanks a lot
 

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