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. 29, 1990
Filed:
Apr. 28, 1989
Kazuo Imanishi, Yokohama, JP;
Kubushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
An amplifier circuit comprises an amplifying section for amplifying an input signal voltage, and feedback resistances for supplying part of an output voltage of the amplifying section as a negative feedback signal voltage thereto. The amplifying section of the amplifier circuit includes a first voltage-current converting amplifier for converting an input signal voltage into a corresponding current, a second voltage-current converting amplifier for converting a negative feedback signal voltage into a corresponding current, an active load circuit for coupling output currents of the first and second voltage-current converting amplifier, which are set in an opposite phase relation, and for generating an output voltage corresponding to the sum of the coupled currents, a voltage amplifier for amplifying the output voltage of the active load circuit, and a control circuit for controlling the ratio of the mutual conductances of the first and second voltage-current converting amplifiers.