A super-regenerative receiver uses controlled Q-quenching and may limit
the resonant tank circuit amplitude by loading the tank circuit as soon
as regenerative oscillation is detected. An amplitude detector is coupled
to the regenerative amplifier and controls a Q loading circuit coupled to
the tank circuit of the regenerative amplifier. The amplitude detector
turns on the Q loading circuit which then stops the regenerative
amplifier from oscillating, and the Q-loading remains on for a brief time
to insure that the regenerative amplifier has stopped oscillating. After
the brief time, the Q loading circuit is turned off and the regenerative
amplifier goes into oscillation again. This cycle repeats controllably
over and over, resulting in a lower self-induced noise floor and improved
received signal sensitivity. The super-regenerative receiver may be used
in the very low frequency (VLF), low frequency (LF), medium frequency
(MF), high frequency (HF), very high frequency (VHF) and super high
frequency (SHF) ranges to receive continuous wave (CW), amplitude
modulated (AM) and frequency modulated (FM) radio signals.