Analog Electronics
A differential amplifier is invariably used in the i/p stage of all OP-amps.This is dome basically to provide the OP-amps with a very high

Bandwidth
Open-loop gain
Slew rate
CMRR

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Analog Electronics
The typical input stage of an opamp has a

  single - ended input and differential output.
  differential input and differential output.
  differential input and single - ended output.
  single - ended input and single-ended output.

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