Multiple choice

If the differential voltage gain and the common mode voltage gain of a differential amplifier are 48 dB and 2 dB respectively, then its common mode rejection ratio is

  1. 23 dB

  2. 25 dB

  3. 46 dB

  4. 50 dB
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C Correct answer
Explanation

$$CMMR = \dfrac{A_d}{A_c}$$

OR

$$20\ log\ CMMR = 20\ log\ A_d - 20\ log\ A_c$$

OR

$$ = 48-2 = 46 dB$$

Where $A_d \rightarrow$ Differential Voltage Gain and $A_c \rightarrow$ Common Mode Voltage Gain

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