Active bandpass filter

Details Active bandpass filter Active bandpass filter

1995-06-07

1996-11-12

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327551, 327552, 330306, 330303, H03K 500, H03H 1108

Patent

active

055743986

ABSTRACT:
An active bandpass filter offers freely settable values of quality factor Q and peak gain. The active bandpass filter has a first transistor, the base of which is connected to an input terminal of the filter via a first capacitance element, the collector of which is connected to a first constant voltage source, and the emitter of which is connected to a first constant current source or a resistance element. The active bandpass filter also has a second transistor, the base of which is connected both to a second constant voltage source via a first resistance element and to the emitter of the first transistor via a second capacitance element, the collector of which is connected both to an output terminal of the filter and, via a second resistance element, to the first constant voltage source, and the emitter of which is connected both to the base of the first transistor via a third resistance element, and also to a second constant current source or a resistance element.

REFERENCES:
"24 Active Filters-A Wide Choice For The Designer", Electronics, vol. 42, No. 15, Jul. 21, 1969.

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