Phase locked loop frequency synthesizer and frequency modulator

Details Phase locked loop frequency synthesizer and frequency modulator Phase locked loop frequency synthesizer and frequency modulator

1978-04-18

1980-01-29

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

331 2, 331 23, 331 25, 332 22, 332 23R, 332;23R, H03B 304, H03C 302

Patent

active

041863569

ABSTRACT:
Frequency-modulated electrical signal generator comprising two oscillators, the first delivering a modulated output frequency and driving a mixer which receives in addition the output of the second oscillator. The latter is phase-controlled by a loop comprising the mixer, a filter and a first phase comparator which receives an intermediate frequency. The first oscillator is controlled by a loop including the second oscillator followed by an adjustable frequency divider and a second comparator receiving a reference frequency.

REFERENCES:
patent: 3319178 (1967-05-01), Broadhead, Jr.
patent: 3480883 (1969-11-01), Gaunt, Jr.
patent: 3838355 (1974-09-01), Papaieck

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