Frequency modulation system

Details Frequency modulation system Frequency modulation system

1977-01-24

1977-11-29

Kominski, John

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

331 2, H03C 300

Patent

active

040607739

ABSTRACT:
An output frequency of a first variable frequency oscillator is frequency-divided and the frequency divided signal is compared in phase with the output frequency of a reference frequency oscillator. The result of the phase comparing is fed back to the first variable frequency oscillator for controlling the output frequency of the first variable frequency oscillator. The output frequency of a second variable frequency oscillator is mixed with the output frequency of a fixed frequency oscillator to produce a difference frequency between both output frequencies. The difference frequency is compared in phase with the output frequency of the first variable frequency oscillator. The result of the phase comparing is used for controlling the output frequency of the second variable frequency oscillator. The output frequency of the fixed frequency oscillator is frequency-modulated by the frequency of a modulating signal.

REFERENCES:
patent: 2958768 (1960-11-01), Brauer
patent: 3319178 (1967-04-01), Broadhead, Jr.
patent: 3361986 (1968-01-01), Catania
patent: 3414842 (1968-12-01), Broadhead, Jr.

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