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:
Jul. 09, 1991
Filed:
Jan. 11, 1990
Patrick Bernard, Eybens, FR;
Christophe Magnier, Saint Jeoire en Valdaine, FR;
SGS-Thomson Microelectronics S.A., Gentilly, FR;
Abstract
A stable reference voltage generator using a current mirror circuit comprising a primary branch and a secondary branch, is shown and described. A first bipolar transistor (Q1) has its collector connected in series with the primary branch of the current mirror, and a voltage divider bridge comprising at least two series-connected resistors (R1, R2), is connected in series between the secondary branch of the current mirror and the collector of a second bipolar transistor (Q2). The base of the second transistor (Q2) is connected to the common point of the series resistors, the base of the first transistor (Q1) is connected to the collector of the second transistor (Q2), and the output of the generator (V.sub.REF) is connected to the terminal of the bridge opposite that connected to the collector of the second transistor (Q2). The geometry of said transistors being such that the first transistor (Q1) is equivalent to 'N' transistors identical to the second transistor (Q2) connected in parallel. An isolation bipolar transistor (Q7) is connected in series between the primary branch of the current mirror circuit and the first transistor, the collector of the latter being connected to the emitter of the isolation transistor.