Analog Electronics
The typical input stage of an opamp has a

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

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Analog Electronics
The magnitude of electric current ICBO

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

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