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. 10, 1994
Filed:
Dec. 22, 1992
Hideyuki Terane, Itami, JP;
Hiroyuki Sugino, Itami, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
There is disclosed an amplifier circuit providing a stable gain independently of fluctuations in power supply voltage, in which resistors (13, 14) and corrective switches (25, 26) having the same construction as analog switches (21 to 24) are provided in a feedback path from an output of an operational amplifier (1) to a negative input thereof, and in which resistors (15, 16) and corrective switches (27, 28) having the same construction as the analog switches (21 to 24) are provided in a reference voltage positive input path from a positive input of the operational amplifier (1) to a reference voltage (VR). An L level logical signal is applied to control inputs (C) of the corrective switches (25 to 28) and an H level logical signal is applied to control inputs (D) thereof. The corrective switches (25 to 28) are constantly set to an ON-state under the same conditions as the analog switches (21 to 24) in the ON-state.