Local oscillator frequency drift compensation circuit

Details Local oscillator frequency drift compensation circuit Local oscillator frequency drift compensation circuit

1981-02-23

1982-07-20

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455316, 331 22, 331 31, H04B 126

Patent

active

043409741

ABSTRACT:
The invention provides a double superheterodyne receiver having the usual first and second frequency changers associated with first and second local oscillators. The second local oscillator is provided as a voltage controlled oscillator and means are provided for determining the difference frequency between the two local oscillators to produce a control signal which is applied to the second local oscillator to tend to maintain the difference frequency constant.

REFERENCES:
patent: 3001068 (1961-09-01), Morita et al.
patent: 3584305 (1971-06-01), Leostic
patent: 3761835 (1973-09-01), Cook
patent: 3806826 (1974-04-01), Schlosser
patent: 3922609 (1975-11-01), Grohmann
patent: 4004232 (1977-01-01), Amaya

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