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. 22, 2001
Filed:
Apr. 15, 1999
Toshio Takeshima, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A level detector enables high speed operation at low voltage with eliminating dependency to fluctuation of a power source voltage and tolerance in a device, and further permits stable operation. The level detecting circuit performs predetermined level shifting of a voltage level of an input signal input from a load voltage generating circuit, with a resistance type potential division by a voltage dividing resistor element using a reference power source voltage independent of a power source voltage to be supplied to own circuit. In this case, a differential amplifier feeds an output depending upon a difference between a level shifted signal from the level shifter and a predetermined reference voltage for leading an output thereof as a detection output. Also, since the reference power source independent of the power source voltage is used, influence of fluctuation of the power source voltage for the circuit is restricted to realize stable operation.