With very low harmonic distortion, 2N4416 JFET is suitable to smoothly oscillate in a circuit. On application where low harmonic content is required for a good mixer circuit, JFET local oscillator is very good. Below is the circuit diagram of Low Distortion Oscillator:

Low Distortion Oscillator circuit schematic

And here’s the 20 MHz Oscillator Values

  • C1 = 700 pF L1 = 1.3 mH
  • C2 = 75 pF L2 = 10T  3/8″  DIA  3/4″  LONG
  • VDD = 16V ID = 1 mA

20 MHz OSCILLATOR PERFORMANCE

  • LOW DISTORTION 20 MHz OSC.
  • 2ND HARMONIC -60 dB
  • 3RD HARMONIC > -70 dB

[Source: National Semiconductor Application Note]