Analog Electronics
In a differential amplifier, the CMRR is limited mostly by the

  tolerance of the resistors.
  supply voltages .
  CMRR of the opamp.
  gain - bandwidth product.

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Analog Electronics
In all base driver amplifiers

ac collector voltage is 180° out of phase with ac base voltage
None of these
ac collector voltage is in phase with ac base voltage
ac emitter voltage is 180° out of phase with ac base voltage

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