Transistorized superregenerative radio frequency detector
First Claim
1. Superregenerative detector apparatus which comprises(a) an oscillatory circuit tuned to the frequency of the signals to be detected, said circuit comprising(i) a transistor having a base, a collector and an emitter,(ii) a circuit including a resonant circuit providing the only direct current path to said base, said resonant circuit being connected between said base and said collector,(b) a quenching circuit comprising(i) means including a capacitor for establishing a quench frequency,(ii) means connecting said capacitor between the collector and emitter of said transistor,(iii) means for applying operating voltage to said capacitor,(iv) said capacitor supplying current to said oscillatory circuit until the voltage at said base reaches the turn on voltage of said transistor thereby establishing the quench frequency of said circuit without additional biasing means connected to said base.
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Abstract
A transistorized superregenerative radio frequency detector which utilizes neither biasing circuits nor a base decoupling capacitor is described herein. The detector is nevertheless self-quenching and operates at a much higher quenching frequency than is the case in conventional superregenerative detectors. Simplifications are afforded over such conventional superregenerative detectors in that the number of components is reduced and the extraction of the demodulated signal as well as the stabilization of the detector is rendered more effective.
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Citations
23 Claims
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1. Superregenerative detector apparatus which comprises
(a) an oscillatory circuit tuned to the frequency of the signals to be detected, said circuit comprising (i) a transistor having a base, a collector and an emitter, (ii) a circuit including a resonant circuit providing the only direct current path to said base, said resonant circuit being connected between said base and said collector, (b) a quenching circuit comprising (i) means including a capacitor for establishing a quench frequency, (ii) means connecting said capacitor between the collector and emitter of said transistor, (iii) means for applying operating voltage to said capacitor, (iv) said capacitor supplying current to said oscillatory circuit until the voltage at said base reaches the turn on voltage of said transistor thereby establishing the quench frequency of said circuit without additional biasing means connected to said base.
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14. Superregenerative detector apparatus which comprises
(a) a transistor having a control electrode and a first and a second electrodes, (b) a resonant circuit including a capacitor and an inductor tuned to the frequency of the signal to be detected, (c) a circuit including said resonant circuit providing the only direct current path to said control electrode, (d) said inductor being connected directly between said control electrode and said first electrode, and (e) a quench capacitor which supplies current to said resonant circuit at a quench frequency connected in a circuit which includes said first and second electrodes, (f) wherein said quench frequency of said detector apparatus is established without additional biasing means connected to said control electrode.
Specification