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:
Jan. 13, 2004
Filed:
Aug. 16, 2002
S. Chen Sean, Sunnyvale, CA (US);
Don R. Sauer, San Jose, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A voltage reference circuit is arranged in a CMOS process based technology to provide a configurable voltage reference. The voltage reference includes bipolar transistors that are implemented as parasitic devices in the CMOS process. Two of the bipolar transistors are configured to generate a &Dgr;Vbe signal in the voltage reference circuit. An error amplifier cooperates with the two bipolar transistors via a control signal such that the control signal is related to &Dgr;Vbe/R. A first current source is coupled to another bipolar device, which is parallel connected to a resistor divider. The output of the resistor divider provides a divided reference signal that is related to the Vbe of the other bipolar device. Another resistor is coupled between a second current source and the output of the resistor divider such that an adjustable/temperature compensated reference signal is provided.