The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 01, 1996
Filed:
Jun. 07, 1995
Hideyuki Hagino, Kumagaya, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
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.