FM Transceiver frequency synthesizer

Details FM Transceiver frequency synthesizer FM Transceiver frequency synthesizer

1982-09-12

1985-07-09

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 16, 331 23, 332 18, 332 19, 455 76, 455 77, H03L 722, H03C 308

Patent

active

045285225

ABSTRACT:
A frequency synthesizer used for a frequency modulation (FM) transceiver which uses negative feedback to make the modulation characteristics linear and stable over a wide frequency range. The negative feedback is comprised of a frequency mixer, which mixes the outputs of a local oscillator and a voltage controlled oscillator, and a frequency divider and demodulator, which act on the output of the frequency mixer and supply the demodulated output signal to an adder, where it is added in reverse phase to the modulating signal.

REFERENCES:
patent: 3307119 (1967-02-01), Holzwarth et al.
patent: 4409563 (1983-10-01), Vandegraaf

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