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:
Feb. 26, 2002
Filed:
Apr. 13, 2001
J. Marcos Laraia, Pocatello, ID (US);
AMI Semiconductor, Inc., Pocatello, ID (US);
Abstract
A current reference circuit provides a reference current that has a controlled temperature coefficient and is relatively stable with supply voltage fluctuations. The reference leg includes a series of MOS transistors including at least one PMOS transistor that is electrically closer in the series to a high voltage source, at least one NMOS transistor that is electrically closer in the series to the low voltage source. The series composite resistor comprises at least two resistors coupled in series within the current path. The size of the resistors may be designed so as to lower the temperature dependency of the circuit. A bipolar transistor is also coupled in the reference leg. The mirror leg is similar to the reference leg except that no series resistor is provided, and the emitter area of the bipolar resistor in the reference leg is larger than the emitter area of the bipolar transistor in the mirror leg.