Radio receiver frequency control system

Details Radio receiver frequency control system Radio receiver frequency control system

1989-08-01

1991-07-02

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455183, 455255, 455262, 455343, H04B 106, H04B 116

Patent

active

050292374

ABSTRACT:
Frequency control in a miniature receiver is effected by a synthesizer that is operated briefly to provide a tuning voltage to a voltage controlled local oscillator. A capacitor is shunted across the output of the synthesizer and is charged to the level of the tuning voltage. After the capacitor is charged, the synthesizer is deenergized and the diminishing voltage provided to the oscillator by the discharging capacitor is correspondingly supplemented by an AFC voltage that tracks drift of the received signal in the IF passband. The deenergizing of the synthesizer eliminates synthesizer noise and reduces the receiver's power consumption.

REFERENCES:
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patent: 4384361 (1983-05-01), Masaki
patent: 4521918 (1985-06-01), Cheillen
patent: 4590618 (1986-05-01), Heath et al.
patent: 4598288 (1986-07-01), Babano
patent: 4631496 (1986-12-01), Borras et al.
patent: 4703520 (1987-10-01), Rozanski, Jr. et al.
patent: 4713808 (1987-12-01), Gaskill et al.
patent: 4743857 (1988-05-01), Childers
patent: 4743864 (1988-05-01), Nakagawa et al.
patent: 4890094 (1990-01-01), Herold et al.

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