Switchable bandpass filter

Details Switchable bandpass filter Switchable bandpass filter

1981-12-29

1984-03-13

Safourek, Benedict V.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330107, 330294, 179 2DP, H03H 1112

Patent

active

044369565

ABSTRACT:
A bandpass filter suitable for use in modem circuitry and other applications which require the filter's center frequency to be switched is disclosed. The filter circuit has the characteristic that although the center frequency is changed the overall gain of the filter remains constant. This characteristic results from using a plurality of filter sections which each have low individual gain and providing compensating gain at the input of the filter. In addition, compensating gain elements are used in each filter section so that when the center frequency of the filter is changed, the gain of each filter stage remains constant.

REFERENCES:
patent: 3602849 (1971-08-01), Geffe
patent: 3852531 (1974-12-01), Fretwell et al.
patent: 4009400 (1977-02-01), Harris et al.
patent: 4275453 (1981-06-01), Wagner

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