Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1995-06-07
1996-10-01
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327552, 330294, 330107, H03K 500
Patent
active
055613942
ABSTRACT:
An active bandpass filter offers freely settable values of quality factor Q and peak gain. The active bandpass filter has a first, a second and a third transistor. The first transistor has a base connected to an input terminal of the filter via a first resistance element, a collector connected both to a constant voltage source via a second resistance element and to an output terminal of the filter and an emitter connected to a first constant current source. The second transistor has a base connected to the emitter of the first transistor via a third resistance element, a collector connected to the constant voltage source via a fourth resistance element and an emitter connected both to the base of the first transistor via a first capacitance element and to a second constant current source. The third transistor has a base connected to the collector of the second transistor, a collector connected to the constant voltage source and an emitter connected both to the base of the second transistor via a second capacitance element and to a third constant current source. Resistors can be used instead of the constant current sources.
REFERENCES:
patent: 3949316 (1976-04-01), Tsurushima
patent: 3974399 (1976-08-01), Oyama et al.
patent: 4524332 (1985-06-01), Gay
Callahan Timothy P.
Kabushiki Kaisha Toshiba
Le Dinh T.
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