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:
Jul. 04, 2000
Filed:
Nov. 30, 1998
Applicant:
Inventors:
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03F / ; H03F / ;
U.S. Cl.
CPC ...
330252 ; 330303 ;
Abstract
In this filter circuit, the emitter of a transistor Q1 is connected to the collector of a transistor Q2, and the base of the transistor Q2 is connected to the emitter of a transistor Q3 and the collector of a transistor Q4. The base of the transistor Q4 is connected to the collector of the transistor Q2. A capacitor C1 is connected between the emitters of the transistors Q2 and Q4, and a capacitor C2 is connected between the collectors of the transistors Q2 and Q4. With this arrangement, the filter circuit consumes a small power, is hardly influenced by the parasitic capacitance, can operate at high frequencies, and has a wide dynamic range.