Frequency modulator

Details Frequency modulator Frequency modulator

1990-12-24

1991-12-24

Mis, David

Modulators

Frequency modulator

Including discrete semiconductor device

332136, 331117R, 331177R, 331177V, 331185, 455113, H03C 300, H03B 500

Patent

active

050756435

ABSTRACT:
An improved frequency modulation apparatus (100) is provided comprising a generator (102), a biasing voltage line (116), and an interface circuit (110). The generator (102) is utilized to generate a carrier signal. A control line input (104) on the generator (102) adjusts the frequency of the carrier signal. The biasing voltage line (116) provides DC power in order to DC bias the generator (102). The interface circuit (110) couples an information signal (114) to the biasing voltage line (116) for altering the biasing of the generator (102) in response to the information signal (114). The alteration of the biasing of the generator (102) results in the carrier signal being frequency modulated by the information signal (114).

REFERENCES:
patent: 3246258 (1966-04-01), Boreen
patent: 3509492 (1970-04-01), Gim Yee Pong et al.
patent: 4088968 (1978-05-01), Pradal et al.
patent: 4343219 (1982-08-01), Uetrecht
Modern Communication Circuits, "7.6 Voltage Controlled Oscillators and Voltage Controlled Crystal Oscillators"; by Jack Smith; pp. 269-270, 1989.

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