Superregenerative circuits using tunnel diodes

CONSIDERABLE DIFFICULTY has been experienced by tunnel diode circuit designers in attempting to bias the tunnel diode in the negative-resistance region and still maintaining a reasonable degree of stability. In the super regenerative circuit we may bias the tunnel diode outside of the negative resistance region, as shown in Figure 1 and periodically permit the operating point to be driven into the negative resistance region. The initial operating point may be in the forward or reverse voltage region depending upon the quench magnitude.