Electrically tuned RF receiver, apparatus and method therefor

Details Electrically tuned RF receiver, apparatus and method therefor Electrically tuned RF receiver, apparatus and method therefor

1991-06-20

1992-04-14

Mis, Davis

Demodulators

Amplitude modulation demodulator

Input signal combined with local oscillator or carrier...

331107A, 331177V, 455336, H03B 500, H03D 1104

Patent

active

051051621

ABSTRACT:
An electrically tuned super-regenerative receiver (10) comprises a feedback type oscillator having a signal output and a signal input, phase shift components (30) connected in a feedback loop for coupling the signal output to the signal input to cause oscillations, and a quench oscillator (35) coupled to the signal input for switching the oscillator between an oscillating and a non-oscillating condition. A variable capacitance device (40), such as a varactor diode, is connected between the signal output and a reference potential (21), and a microprocessor (105) provides a tuning voltage (42) which is applied at the signal output for varying the current in the varactor diode, thereby varying the oscillator center operating frequency. The oscillator center operating frequency is detected by a spectrum analyzer (112) and compared to a desired center operating frequency by a controller (118). The controller controls a signal generator (123) to transmit a control signal which is received by the receiver and provided to the microprocessor for varying the tuning voltage to change the oscillator center operating frequency to be equal to the desired center operating frequency. An EEPROM (108) is provided for storing the tuning voltage required to produce oscillations at the desired center operating frequency.

REFERENCES:
patent: 2936428 (1960-05-01), Schweitzer
patent: 3868595 (1975-02-01), Capps, Jr. et al.
patent: 4325032 (1982-04-01), Gilden
patent: 4749964 (1988-06-01), Ash
patent: 5043681 (1991-08-01), Tanemura et al.

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