Differential anplifier as an input stage in op-amps

Q.  Which among the following serves as an input stage to most of the op-amps due to its compatibility with IC technology?
- Published on 25 Nov 15

a. Differential amplifier
b. Cascode amplifier
c. Operational transconductance amplifiers (OTAs)
d. Voltage operational amplifier

ANSWER: Differential amplifier

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