Phase-locked loop oscillator circuit utilizing a sub-loop with a

Details Phase-locked loop oscillator circuit utilizing a sub-loop with a Phase-locked loop oscillator circuit utilizing a sub-loop with a

1981-05-11

1984-01-17

Miller, Stanley D.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 17, 331 25, H03L 718, H03L 722

Patent

active

044266278

ABSTRACT:
A phase-locked loop oscillator circuit having a reference signal generator, a voltage-controlled oscillator and a phase comparator comprises a second phase comparator. The first phase comparator is supplied with an output of the reference signal generator whose frequency has been lowered and also an output of the voltage-controlled oscillator whose frequency has been lowered. The second phase comparator is supplied with a signal which has been derived from an intermediate position of a higher-frequency path extending from the reference signal generator to the first phase comparator and also a higher-frequency signal which has been derived from an intermediate position of a path extending from the voltage-controlled oscillator to the first phase comparator. Outputs of the first and second phase comparators are added and applied to the voltage-controlled oscillator to reduce residual FM noise.

REFERENCES:
patent: 3579281 (1971-05-01), Kam et al.
patent: 3600700 (1971-08-01), Matsuo
patent: 4114110 (1978-09-01), Nossen
patent: 4131861 (1978-12-01), Malaviya
patent: 4205277 (1980-05-01), Poinas

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