Fast-switching frequency synthesizer

Details Fast-switching frequency synthesizer Fast-switching frequency synthesizer

1990-02-02

1991-06-25

Grimm, Siegfried H.

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

331 10, 331 14, 331 16, 331 17, 331 25, H03C 309, H03L 7085, H03L 718

Patent

active

050270877

ABSTRACT:
An improved fast-switching frequency synthesizer is disclosed. The fast-switching frequency synthesizer, according to the invention, utilizes presteering voltage injection at the voltage controlled oscillator ("VCO") with feedback to allow the VCO, and synthesizer, to quickly transition between two given frequencies. This presteering mechanism, with the feedback, allows the presteering voltage to track the variations in the VCO gain from device to device, and gain changes while in operation. This same information is used to implement a means of automatically adjusting the FM deviation of the transmitter since that information varies with the gain of the VCO as does the FM deviation.

REFERENCES:
patent: 4105948 (1978-08-01), Wolkstein
patent: 4410860 (1983-10-01), Kipp et al.
patent: 4511858 (1985-04-01), Charavit et al.
patent: 4634998 (1987-01-01), Crawford

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