Analog Electronics
For transistor action

  the emitter should be heavily doped.
  the base region must be very thin and lightly doped.
  all of these.
  Je must be forward biased and Jc should be reverse biased.

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Analog Electronics
Voltage Series (feedback also called series-shunt feedback) results in

Decrease in input impedance & increase in output impedance
Increase in input impedance & decreases in output impedance
Decreases in both input & output impedances
Increase in both input & output impedances

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