Radio receiver with programmable digital tuner immune to manufac

Details Radio receiver with programmable digital tuner immune to manufac Radio receiver with programmable digital tuner immune to manufac

1996-09-24

1998-11-24

Vo, Nguyen

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551861, H04G 118

Patent

active

058421203

ABSTRACT:
A storing circuit for storing control data for a varactor diode, a frequency divided data generating circuit for generating frequency divided data to set the local oscillating frequency of a local oscillating circuit, a determining circuit for computing a receiving frequency from the frequency divided data and determining whether or not the receiving frequency is within a designated frequency range and an arithmetic circuit for executing computation in compliance with data indicating the receiving frequency and control data stored in the storing circuit are provided, and the capacitance of the variable capacitance element is controlled by analog-conversion of an output signal from the arithmetic circuit, thus tracking errors caused by variation in tuning elements are prevented and an RF tuning circuit control interval is reduced.

REFERENCES:
patent: 4061982 (1977-12-01), Kawashima
patent: 4128849 (1978-12-01), Rhee
patent: 4142157 (1979-02-01), Tanaka
patent: 4152654 (1979-05-01), Tanaka
patent: 4236251 (1980-11-01), Ohgishi et al.
patent: 4419769 (1983-12-01), Cohen
patent: 4794650 (1988-12-01), Yokoyama
patent: 5212817 (1993-05-01), Atkinson
patent: 5417661 (1995-05-01), Atkinson
patent: 5552749 (1996-09-01), Nowatski et al.
European search report dated Dec. 12, 1996 for application serial No. EP 96 30 7110.

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