Analog Electronics
A JFET has disadvantage of

  being noisy.
  having small gain-bandwidth product.
  having low input impedance.
  possessing positive temperature coefficient.

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Analog Electronics
For an NPN transistor in normal bias

  only holes cross the collector junction.
  Je is forward biased and Jc is reverse biased.
  the emitter junction has high resistance.
  only majority carriers cross the collector junction.

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