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Analog circuits miscellaneous

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Analog circuits miscellaneous
  1. If differential amplifier has a differential gain of 20,000. CMRR = 80 dB, then common mode gain is
    1. 2
    2. 1
    3. 1 / 2
    4. 0
Correct Option: A

20 log
Ad
 = 80
Ac

⇒
Ad
 = 104
Ac

⇒
Ad
 = Ac
104

⇒ Ac =
2 × 104
 = 2
104


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