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:
Nov. 25, 2014
Filed:
Jun. 16, 2011
Andre Luis Vilas Boas, Campinas, BR;
Alfredo Olmos, Austin, TX (US);
Edgar Mauricio Camacho Galeano, Campinas, BR;
Fabio DE Lacerda, Niteroi, BR;
Andre Luis Vilas Boas, Campinas, BR;
Alfredo Olmos, Austin, TX (US);
Edgar Mauricio Camacho Galeano, Campinas, BR;
Fabio de Lacerda, Niteroi, BR;
Freescale Semiconductor, Inc., Austin, TX (US);
Abstract
A low voltage detector () includes a power supply voltage monitor circuit () that produces a voltage Vrelated to a first a power supply voltage, and a voltage generator (), which includes a plurality of self-cascode MOSFET (SCM) structures (-) in a cascade configuration, that generates a reference voltage V. A voltage comparator () outputs an output signal in response to a differential between Vand V, wherein Vand Vhave proportional to absolute temperature behavior (PTAT) over temperature with respect to a second power supply voltage. The output signal changes state when the first power supply voltage equals a trip point of the comparator. Each SCM structure is sized to provide a rate of change with temperature of the PTAT behavior of Vthat matches a rate of change with temperature of the PTAT behavior of V.