Simple Low Distortion Oscillator Circuit

This is the design circuit for oscillator. This circuit is based on FET as controller. This is the figure of the circuit;


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.

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

[Circuit Schematic Source: National Semiconductor Application Note]