A certain diff. amplifier has a differential voltage gain of 2000 and a common mode gain of 0.2. The CMMR is decibels (dB) is:

A certain diff. amplifier has a differential voltage gain of 2000 and a common mode gain of 0.2. The CMMR is decibels (dB) is:

Given that, differential voltage gain (A_d) = 2000

Common mode gain (A_c) = 0.2

Common mode rejection ratio (CMRR) is given by,

$(CMRR = 20\log \left| {\frac{{{A_d}}}{{{A_c}}}} \right| = 20\log \left| {\frac{{2000}}{{0.2}}} \right| = 80\;dB)$

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