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. 23, 1999
Filed:
Oct. 13, 1998
Davide Giacomini, Valdengo, IT;
STMicroelectronics, S.r.L., Agrate Brianza, IT;
Abstract
A generator circuit for a reference voltage independent of temperature variations uses a Brokaw cell biased by a current generator. The generator circuit includes a start-up circuit for delivering a current to the load of the generator using a transistor from the power-on instant until the switching on of the Brokaw cell and the consequent switching-off of the transistor. The circuit further includes a first field effect transistor having a gate coupled to a bandgap voltage node of the Brokaw cell and operatively connected in series with at least one diode between a biasing current generator of the start-up circuit and ground. The circuit also includes a second bipolar junction transistor having a base coupled to the power supply node of the Brokaw cell and operatively connected to a load resistance that is, in turn, connected to the supply rail and to the output transistor of the Brokaw cell for supplying current to the load during the start-up phase.