Circuit arrangement for compensating temperature-dependent frequ

Details Circuit arrangement for compensating temperature-dependent frequ Circuit arrangement for compensating temperature-dependent frequ

1980-06-11

1981-09-15

Bookbinder, Marc E.

Telecommunications

Transmitter

Angle modulation

332 18, 455118, 455119, H04B 104

Patent

active

042901456

ABSTRACT:
A subcarrier frequency-modulated with a message signal is heterodyned with a carrier from a crystal-controlled oscillator in a mixer whose output is fed to a filter eliminating one of the resulting sidebands. In order to compensate temperature-dependent fluctuations of the carrier frequency, a function generator produces a corrective signal which is added to the message signal in the input of the frequency modulator traversed by the subcarrier. The corrective signal varies as a quadratic or a cubic function of temperature, depending upon the type of cut used on the quartz crystal controlling the carrier oscillator, with a polarity determined by which of the two sidebands is passed by the filter.

REFERENCES:
patent: 3360746 (1967-12-01), Weidknecht
patent: 3531739 (1970-09-01), Groves
patent: 3534295 (1970-10-01), Gregory
patent: 3550006 (1970-12-01), Harner
patent: 3821665 (1974-06-01), Irwin et al.

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