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 single - ended output.
  differential input and differential output.

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Analog Electronics
The magnitude of electric current ICBO

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

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