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:
May. 05, 1992
Filed:
Nov. 29, 1990
Masayuki Hachiuma, Kawasaki, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
In a current amplifier circuit having a feedback type operational amplifier, the operational amplifier has at an output stage a signal detecting transistor through which a signal current flowing through the feedback loop flows. The current amplifier circuit further comprises a bias current adder circuit, a bias current subtractor circuit, and a reference bias generator. The bias current adder circuit allows a bias current to flow steadily through the signal current detecting transistor of the operational amplifier. The bias current subtracter circuit has a further transistor through which a current flows of a magnitude equal to the sum current of the signal current flowing through the signal current detecting transistor and the bias current, and subtracts the bias current from the current flowing through the transistor to output only the signal current. The reference bias generator circuit determines a magnitude of the bias current.