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:
Apr. 17, 2001
Filed:
Sep. 15, 1999
Klaas-Jan De Langen, Hoofddorp, NL;
Johan H. Huijsing, Schipluiden, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A reference circuit contains a PTAT (Proportional To Absolute Temperature) core. In the PTAT core there is a difference between the currents densities flowing through a first and second transistor. This difference results in a difference in junction voltage in the first and second transistor. The currents are adjusted by a local feedback loop in proportion to one another until the difference in junction voltage equals a voltage drop across a resistor. According to the invention the currents to both transistors are supplied by current sources, and the currents are adjusted by deviating a fraction of the supplied current from the transistors. This makes it possible to reference all control voltages for the transistors and the local feedback loop to the same supply connection, which increases the stability and power supply rejection of the circuit.