Cordless telephone with digital frequency adjustment

Details Cordless telephone with digital frequency adjustment Cordless telephone with digital frequency adjustment

1998-01-21

1999-09-07

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 16, 331 25, 331158, 327156, 379 55, 379387, 455125, 455297, H03L 700, H03B 536, H04M 900

Patent

active

059492910

ABSTRACT:
A digitally-controlled frequency synthesizer circuit is provided. The synthesizer circuit has a synthesizer that provides as an output a signal that is based on a reference frequency supplied from a resonator circuit. The reference frequency of the resonator circuit can be tuned by varying the control voltage applied to a voltage variable capacitor that is coupled to the resonator circuit. The voltage variable capacitor is located on the synthesizer. A digital-to-analog converter is also located on the synthesizer. The digital-to-analog converter provides the analog control voltage for the voltage variable capacitor based on digital voltage control data.

REFERENCES:
patent: 4598257 (1986-07-01), Southard
patent: 4726051 (1988-02-01), Schuermann
patent: 4746879 (1988-05-01), Ma et al.
patent: 4752748 (1988-06-01), Grzeszykowski
patent: 5381475 (1995-01-01), Cavallo
patent: 5459435 (1995-10-01), Taki
patent: 5473284 (1995-12-01), Jantti et al.

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