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:
Jun. 15, 2004
Filed:
Apr. 30, 2001
Applicant:
Inventors:
David C. McClure, Carrollton, TX (US);
Rong Yin, Coppell, TX (US);
Assignee:
STMicroelectronics, Inc., Carrollton, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K 5/22 ;
U.S. Cl.
CPC ...
H03K 5/22 ;
Abstract
A circuit and method are disclosed for monitoring the voltage level of an unregulated power supply. The circuit includes a voltage reference circuit for generating a first reference voltage signal and a trim circuit which generates a trimmed reference voltage signal based upon the first reference voltage signal. A comparator compares the unregulated power supply voltage to the trimmed reference voltage signal and asserts an output signal based upon the comparison. The output signal is fed back as an input to the trim circuit so that the trim circuit provides a hysteresis effect.