Analog Electronics
Which of the following is expected to have highest input impedance?

  Common collector bipolar transistor
  JEFT amplifier.
  MOSFET.
  CE bipolar transistor.

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Analog Electronics
In all base driver amplifiers

ac collector voltage is in phase with ac base voltage
ac emitter voltage is 180° out of phase with ac base voltage
ac collector voltage is 180° out of phase with ac base voltage
None of these

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