Analog Electronics
The typical input stage of an opamp has a

  single - ended input and single-ended output.
  single - ended input and differential output.
  differential input and differential output.
  differential input and single - ended output.

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Analog Electronics
The magnitude of electric current ICBO

  increases with the increase in temperature.
  depends largely upon the emitter doping.
  is generally greater in silicon than in germanium transistor.
  depends largely upon emitter-base junction base potential.

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