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Discuss the Voltage Gains of DA

Discuss the Voltage Gains of DA

Answers

- The voltage gain of a DA operating in differential mode is called differential-mode voltage gain and is denoted by A_DM. The voltage gain of DA operating in common-mode is called common-mode voltage gain and is denoted by A_CM.
- Ideally, a DA provides a very high voltage gain for differential-mode signals and zero gain for common-mode signals. However, practically, differential amplifiers do exhibit a very small common- mode gain (usually much less than 1) while providing a high differential voltage gain (usually several
thousands). The higher the differential gain w.r.t. the common-mode gain, the better the performance of the DA in terms of rejection of common-mode signals.
- A differential amplifier should have high differential voltage gain (ADM) and very low common mode voltage gain (A_CM). The ratio A_DM/A_CM is called common-mode rejection ratio (CMRR) i.e.,

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Wilfykil answered the question on August 15, 2019 at 13:53

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