Switchable bandpass filter for a multiband tuner

Details Switchable bandpass filter for a multiband tuner Switchable bandpass filter for a multiband tuner

1997-06-26

2000-05-16

Bost, Dwayne D.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551881, 4551932, 4551933, 455266, 455339, 455340, H04B 118, H04B 116, H04B 106

Patent

active

06064866&

ABSTRACT:
To achieve a high passband attenuation, a switchable bandpass filter for a multiband tuner, includes at least a capacitance diode for frequency-tuning of at least a resonant circuit of the bandpass filter, and a switching diode arranged at the input and the output, this switching diode being switchable to either the blocked state or to the conducting state by DC voltages. The capacitance diode is additionally usable for blocking the bandpass filters and is integrated in the resonant circuit of the bandpass filter in such a way that, in dependence upon a switching potential, the capacitance diode couples the resonant.

REFERENCES:
patent: 4573211 (1986-02-01), Kupfer
patent: 4905306 (1990-02-01), Anderson
patent: 4972509 (1990-11-01), Maejima
patent: 5752179 (1998-05-01), Dobrovolny
patent: 5835853 (1998-12-01), Enoki et al.

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