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:
Mar. 05, 2013
Filed:
Jun. 30, 2010
Harish Raghavan, Austin, TX (US);
John Christopher Tucker, Austin, TX (US);
Scott Allan Woodford, Austin, TX (US);
Daniel John Allen, Austin, TX (US);
Anand Ilango, Austin, TX (US);
Harish Raghavan, Austin, TX (US);
John Christopher Tucker, Austin, TX (US);
Scott Allan Woodford, Austin, TX (US);
Daniel John Allen, Austin, TX (US);
Anand Ilango, Austin, TX (US);
Cirrus Logic, Inc., Austin, TX (US);
Abstract
A voltage reference circuit provides a precision voltage reference output without requiring a filter capacitor. The voltage reference output is generated by a digitally-controlled source, which has a value set by the output of a digital filter that filters the output of a comparison circuit that compares the voltage reference output to another reference. A selectable mode can be provided to provide a fast response during a startup/reset period and an optional hold or narrowband response after startup. The mode selection may also offer selection of an externally-supplied digital control value and/or a resistor divider type voltage reference as an alternative to the digitally-controlled source.