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

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

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Analog Electronics
A working diode must have

 Low resistance when forward biased, while high resistance when reverse bias
 Low resistance when forward or reverse biased
 High resistance when forward biased, while low resistance when reverse bias
 High resistance when forward or reverse biased

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