The op-amp has a differential voltage gain of 1200 and common mode gain of 1.5. Then, the CMRR of op-amp is
Question and options
The op-amp has a differential voltage gain of 1200 and common mode gain of 1.5. Then, the CMRR of op-amp is
- 1200
- 1.5
- 800
- 1800
Answer and explanation
Correct answer: C - 800
The common-mode rejection ratio is the differential-mode gain divided by the common-mode gain: CMRR = 1200/1.5 = 800. Quoting 1200 or 1.5 gives only one of the two gains, and 1800 comes from multiplying instead of dividing.
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