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:
Aug. 13, 2002
Filed:
Apr. 09, 2001
Gregory J. Smith, Tucson, AZ (US);
Yinming Chen, Tucson, AZ (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A bias current source circuit with high power supply rejection. In one embodiment, the present invention is comprised of a bias current source circuit. The bias current source circuit is comprised of a primary current source coupled to a power supply, a secondary current source for biasing the primary current source and also coupled to the power supply, and a gain stage. In the present embodiment, the primary current source includes a first transistor having a first region coupled to a second resistor and a second transistor having a first region coupled to the second resistor. In the present embodiment, the gain stage includes a first input coupled to the second region of the first transistor. The simple gain stage further includes a second input coupled to the second region of the second transistor. The gain stage also includes an output coupled to the first regions of the first and second transistors.