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

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

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Analog Electronics
The ICBO is the electric current that flows when some DC voltage is applied

  in the reverse direction to the collector junction with emitter open.
  in the reverse direction to the emitter junction with collector open.
  in the forward direction to the collector junction with emitter open.
  in the forward direction to the emitter junction with collector open.

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