FM Modulator using variable transistor capacitance

Details FM Modulator using variable transistor capacitance FM Modulator using variable transistor capacitance

1980-02-04

1981-12-01

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

331117R, 331177V, 332 30V, H03C 314

Patent

active

043038948

ABSTRACT:
In an FM modulation circuit, a variable capacitance circuit employs a transistor as a variable capacitance element. The transistor has resistors connected between the emitter and base thereof and between the collector and base thereof, respectively, and is connected under the unbiased state to an oscillating transistor of an oscillation circuit constituting the FM modulation circuit. In correspondence with an input signal applied across the emitter and collector of the variable capacitance transistor, the emitter--collector capacitance of this transistor is varied to vary the oscillation frequency of the oscillation circuit.

REFERENCES:
patent: 2888648 (1959-05-01), Herring
patent: 3108234 (1963-10-01), Burns
patent: 3728645 (1973-04-01), Rosen et al.
patent: 4021737 (1977-05-01), Trask

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