A common-mode rejection ratio CMRR of an-amp, that has a

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A common-mode rejection ratio CMRR of an-amp, that has a differential gain of 2,00,000 and a common mode gain 6.33:

1. 90 dB
2. 70 dB
3. 80 dB
4. None of these

Correct Option: A

CMRR in dB= 20 log₁₀		A_d
		A_c

= 20 log₁₀		2‚00‚000
		6·33

= 89.99
= 90 dB