Homodyne automatic frequency control circuit

Details Homodyne automatic frequency control circuit Homodyne automatic frequency control circuit

1975-09-26

1977-02-01

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With intermittent comparison controls

325148, 331 23, 332 19, H03B 310, H03C 300

Patent

active

040064298

ABSTRACT:
Homodyne automatic frequency control circuitry maintains the mean or center output frequency of a controlled oscillator, e.g., the output of a voltage controlled oscillator effecting frequency modulation, equal to the output frequency of a reference oscillator. The composite AFC circuitry employs ganged sampling switches and a common mode error obviating common frequency detector (e.g., a discriminator) to alternately store voltages representative of the reference and controlled oscillator frequencies in capacitors connected to the inputs of a difference amplifier. The difference amplifier acts through an integrator to supply any necessary correction potential to the control port of the controlled oscillator when the signals stored in the two capacitors differ, signalling that the mean output frequency of the controlled oscillator has departed from that of the reference oscillator.

REFERENCES:
patent: 3297965 (1967-01-01), Chadima
patent: 3614648 (1971-10-01), Byrne
patent: 3857108 (1974-12-01), Kanow

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