Phase lock loop for a voltage controlled oscillator

Details Phase lock loop for a voltage controlled oscillator Phase lock loop for a voltage controlled oscillator

1976-01-06

1977-02-22

Kominski, John

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

331 9, 331 12, 331 36C, H03B 304

Patent

active

040094480

ABSTRACT:
A phase lock loop configuration having a voltage controlled oscillator utilized, for example, in radar systems wherein false locking is prevented and loop bandwidth is maintained substantially constant. The voltage controlled oscillator includes a cavity resonator within which is located two tuning varactor diodes, one of which is heavily coupled to the resonator and comprises a coarse tuning port and one of which is lightly coupled and comprises the fine tuning port. The configuration is such that when the loop is locked, following a sweep mode of the coarse tuning voltage, the fine tune voltage is held constant at a predetermined DC level thereby making the fine tuning sensitivity essentially constant as the coarse tuning voltage changes the frequency over the band of interest.

REFERENCES:
patent: 2969458 (1961-01-01), Parkinson
patent: 3091740 (1963-05-01), Murphy, Jr.
patent: 3825855 (1974-07-01), Basset et al.
patent: 3852682 (1974-12-01), Dawe et al.

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