Circuit arrangement for tuning and range or band switching of an

Details Circuit arrangement for tuning and range or band switching of an Circuit arrangement for tuning and range or band switching of an

1975-03-14

1976-09-14

Griffin, Robert L.

Tuners

Tuner unit with electromagnetic operator

Predetermined center frequency selector

334 15, H04B 106

Patent

active

039809579

ABSTRACT:
A television tuner features a switching voltage generator that resets the voltage across the varicap tuning diodes to about zero voltage when a new tuning range is switched on. This allows the full steepness of the capacitance-voltage characteristics of the diodes to be used in each range. This in turn allows more ranges to be tuned and reduces the effects of stray capacitances.

REFERENCES:
patent: 3611154 (1971-10-01), Kupfer
patent: 3617915 (1971-11-01), Amemiya et al.
patent: 3646450 (1972-02-01), Ma
patent: 3813615 (1974-05-01), Okazaki
patent: 3825858 (1974-07-01), Amemiya et al.
patent: 3889210 (1975-06-01), Matsuura et al.

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