Analog Electronics
The following are the necessary requirements of an oscillator

 Amplitude stability
 Power stability
 Both A and B
 Frequency stability

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Analog Electronics
The common-source JFET amplifier has

  a high input impedance and a voltage gain less than 1.
  no voltage gain.
  a very high input impedance and a relatively low voltage
  a high input impedance and a very high voltage gain.

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