Circuit arrangement for a tuner for changing over two frequency

Details Circuit arrangement for a tuner for changing over two frequency Circuit arrangement for a tuner for changing over two frequency

1986-03-11

1988-04-05

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455190, 455339, 455340, 334 14, 334 47, H04B 116

Patent

active

047364572

ABSTRACT:
The invention relates to a circuit arrangement for a tuner, particularly a television tuner, for a change over switching between two frequency bands with the aid of a switching diode, said frequency bands, particularly the VHF band and the hyperband, being filtered out by means of bandpass filters (1,7). The bandpass filters have at their inputs and outputs capacitance diodes for the purpose of tuning. The filtered signals are applied to a common tunable circuit (15) on the secondary side of the bandpass filters. The bandpass filter for the hyperband is constructed and dimensioned such that the signal is switched through by means of a switching diode (83) arranged at the low end of the bandpass filter (1). When this diode (83) is conducting a smaller output reactance, whereas in the case of a blocking switching diode (83), this bandpass filter (1) cuts off the signal and has a larger output reactance. Furthermore, the bandpass filter (7) for the VHF band is constructed and dimensioned such that it filters out the desired frequency range in the case of a larger output reactance of the first bandpass filter (1) and is detuned in the case of a smaller output reactance of the first bandpass filter (1).

REFERENCES:
patent: 3696302 (1972-10-01), Gossard
patent: 3727140 (1973-04-01), Rodrigalvarez Nieto et al.
patent: 4118679 (1978-10-01), Hiday et al.
patent: 4326295 (1982-04-01), Matsumoto et al.
patent: 4397037 (1983-08-01), Theriavlt
patent: 4408348 (1983-10-01), Theriavlt
patent: 4418428 (1983-11-01), Evans

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