Question
Download Solution PDFThe differential voltage gain and common mode voltage gain of a differential amplifier are 50 dB and 3 dB respectively, then common mode rejection ratio is
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
The output voltage of op-amp is given by:
V0 = Ad Vd + Ac Vc
Where, Vd = V1 – V2
Ad = differential voltage gain
Ac = common mode voltage gain
Calculation:
Given,
Differential voltage gain = 50 dB
Common mode voltage gain = 3 dB
CMRR = 20 log(Ad) - 20 log(Ac)
= 50 - 3 = 47 dB
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