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

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

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Analog Electronics
Voltage Series (feedback also called series-shunt feedback) results in

Decrease in input impedance & increase in output impedance
Decreases in both input & output impedances
Increase in input impedance & decreases in output impedance
Increase in both input & output impedances

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