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. 21, 2013
Filed:
Feb. 03, 2010
Applicant:
Hiroyuki Kobatake, Kanagawa, JP;
Inventor:
Hiroyuki Kobatake, Kanagawa, JP;
Assignee:
Renesas Electronics Corporation, Kanagawa, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R 31/02 (2006.01); G01R 31/26 (2006.01);
U.S. Cl.
CPC ...
Abstract
A test circuit includes a signal level modifying circuit. The signal level modifying circuit modifies at least one of signal levels of an inverting input signal and a noninverting input signal supplied to a differential input circuit in response to a test signal outputted from a signal output circuit to make a difference between signal levels of the inverting input signal and the noninverting input signal smaller than that in a normal operation. Here, the test signal indicates a test mode in which input/output characteristics of the differential input circuit is tested.