Frequency modulator having LC oscillator with switchable frequen

Details Frequency modulator having LC oscillator with switchable frequen Frequency modulator having LC oscillator with switchable frequen

1995-04-04

1996-04-09

Grimm, Siegfried H.

Modulators

Frequency modulator

Including discrete semiconductor device

331117R, 331179, 348724, 358330, 360 30, 455113, H03C 309, H04N 5922

Patent

active

055065473

ABSTRACT:
A frequency modulation circuit which varies the resonance frequency of an LC resonance circuit, and which corresponds to the frequency modulation conversions of all TV methods with a simple constitution. Each of a plurality of passive element series circuits for varying a time constant of the LC resonance circuit is composed of, for instance, a capacitor and a resistor, which is switched and controlled by connecting to or separating from the LC resonance circuit by a switching circuit such as a transistor. Thereby, the oscillation frequency of the LC resonance circuit can be easily converted to a predetermined frequency.

REFERENCES:
patent: 3775555 (1973-11-01), Carlson
patent: 4533882 (1985-08-01), Shinbara

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