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:
Feb. 23, 1999
Filed:
Aug. 06, 1996
Tetsuyoshi Shiota, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A semiconductor circuit includes an internal circuit of plural transistors formed in a well of semiconductor substrate and, for each transistor, a threshold level indicator voltage generating circuit which detects a threshold level of the respective one of the plurality of transistors, a control signal generating circuit which generates a control signal in accordance with the threshold level detected by the threshold level indicator voltage generating circuit and a switching circuit responsive to a received control signal for switching to a designated one of plural power supplies of respective, different voltages for connection to the well. The switching circuit is controlled in accordance with the detected threshold level, so that the well is connected to an appropriate power supply. Any variation in the threshold level thereby is corrected since the well potential is controlled to a proper level so that a desired threshold level is obtained, for each of the plural transistors.