If the differential and common mode gains of a differential

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If the differential and common mode gains of a differential amplifier are 50 to 0·2 respectively, then the CMRR will be—

1. 100 dB
2. 49·8 dB
3. 8·7 dB
4. 10·7 dB

Correct Option: D

Given, differential mode gain A_d = 50 and common mode gain A_c = 0·2

CMRR in dB = 20 log₁₀	A_d
	A_c

= 20 log₁₀	50
	0.2

= 20 logv10 250
= 10·7 dB