The ability of a differential amplifier (or other device) to reject common-mode signals is measured using the common mode rejection ratio (CMRR). The CMRR of a differential amplifier should be infinite, however this is not practical. The non-inverting amplifier has a positive gain while the inverting amplifier has a negative gain.
How much gain does an inverting versus a non-inverting amplifier have?
The ratio of the resistances determines the gain that the inverting amplifier offers. Contrarily, the non-inverting amplifier's gain is calculated by adding 1 to the resistances' respective ratios.
What is the ratio of cm gain to non-inverting gain?
Remember that non-inverting gain is 1+k while inverting voltage gain has the ratio =-k. For a given R ratio, k=R2/R1, therefore A v (C M) = (R 2 R 1 + 1) (R 2 ′ R 1 ′ + R 2 ′) (R 2 R 1) = 0 for a given CM gain to a certain bias current DC offset voltage.
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