Phase locked loop with D.C. modulation and use in receiver

Details Phase locked loop with D.C. modulation and use in receiver Phase locked loop with D.C. modulation and use in receiver

1990-05-24

1992-02-25

Grimm, Siegfried H.

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

331 23, 331 25, 332128, 455113, 455209, 455260, 455346, H03C 309, H03L 7197, H04B 126

Patent

active

050917064

ABSTRACT:
A D.C. modulated phase locked oscillator (60, 80, 100, 140, 160, or 190) and a radio frequency receiver (200) that utilizes the D.C. modulated phase locked oscillator (60, 80, 100, 140, 160, or 190) both include a phase locking oscillator (70, 90, 128, 180, or 192) and a D.C. modulator (72, 92, 130, 156, 182, or 194). Both a forward path (14) and a feedback path (16) are D.C. modulated. D.C. modulation of the feedback path (16) optionally includes changing the frequency in the feedback path (16) as a function of the frequency of a modulation oscillator (64), changing the frequency in the feedback path (16) by a plurality of pulses for each cycle of the modulation oscillator (64), removing pulses from the feedback path (16), adding pulses to the feedback path (16), dividing the frequency in the feedback path (16) by higher and lower dividing ratios, preventing one cycle in the feedback path (16) from developing a " high" in the feedback path (16), and holding a "high" in the feedback path (16) between two adjacent pulses.

REFERENCES:
patent: 3346814 (1967-10-01), Haggai
patent: 3622913 (1971-11-01), Shipley
patent: 3805192 (1974-04-01), Ocnaschek et al.
patent: 4516083 (1985-05-01), Turney
patent: 4653117 (1987-03-01), Heck
patent: 4837853 (1989-06-01), Heck

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