A tunnel-diode oscillator with an SAW resonator

Experiments were conducted to investigate the effect of changes in the bias voltage on the frequency of a tunnel-diode oscillator stabilized by a surface-acoustic-wave resonator. For an oscillator with a parallel resonance frequency of 78.901 MHz, a change in the bias voltage from 0.15 to 0.54 V produces a 4-percent change in the generation frequency. The frequency instability is described by an N-shaped curve, which is attributed to the effect of higher harmonics. However, in the bias voltage range 0.226-0.372, the frequency instability of the oscillator does not exceed 2 x 10 to the -4th.