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:
Jan. 23, 1990
Filed:
Oct. 26, 1988
Richard A Johnson, Murrysville Boro, PA (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
The present invention provides a precision variable gain current-to-voltage amplifier which has a test mode of operation wherein the gain is independent of the gain of the amplifier when operated in the normal amplification mode. The invention enables a test signal, preferably a test voltage, to be injected into the amplifier circuit to test the functioning of the op amp and thus the amplifier. Because the gain of the amplifier in the test mode is independent of the gain of the amplifier when in the normal mode, a simple and easy method of checking the functioning of the op amp is provided which does not require knowing the gain of the amplifier and then selecting the proper test input to use.