Method for tuning channels in a voltage synthesizer tuning circu

Details Method for tuning channels in a voltage synthesizer tuning circu Method for tuning channels in a voltage synthesizer tuning circu

1996-10-25

1998-08-18

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551841, 4551972, H04B 118

Patent

active

057970866

ABSTRACT:
A method for tuning to channels in a voltage synthesizer tuning circuit. Pulse width modulation data corresponding to an average error value of a variable capacitance diode is set to cope with an error of a tuning voltage varying with an error of the variable capacitance diode. An initial channel is tuned on the basis of an average value of the set pulse width modulation data and an automatic fine tuning operation is performed while the set pulse width modulation data is varied. The error of the variable capacitance diode is determined by comparing the average value of the set pulse width modulation data with the varied step. The set pulse width modulation data is corrected by such a value that can cope with upper and lower limit values of the determined error of the variable capacitance diode and then output to a tuner driver. The subsequent channel is tuned on the basis of the corrected pulse width modulation data. The set and corrected pulse width modulation data are stored in a memory and then output so that the subsequent channel can be tuned. A frequency of the tuned channel is displayed on a screen.

REFERENCES:
patent: 3593154 (1971-07-01), Blass
patent: 4058772 (1977-11-01), Mogi et al.
patent: 4160213 (1979-07-01), Carter
patent: 4187467 (1980-02-01), Cammings
patent: 4264976 (1981-04-01), Yamashita
patent: 4404686 (1983-09-01), Moon
patent: 4450587 (1984-05-01), Beyers, Jr.

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