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

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

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Analog Electronics
Why is silicon preferred than germanium ?

 Leakage current due to minority charge carrier is less in silicon
 Silicon has higher tolerance to temperature
 Current sensitivity of silicon with temperature is less
 All the above

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