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:
Oct. 18, 2005
Filed:
Dec. 12, 2003
Ka Y. Leung, Austin, TX (US);
Doug Piasecki, Austin, TX (US);
Ka Y. Leung, Austin, TX (US);
Doug Piasecki, Austin, TX (US);
Silicon Labs CP, Inc., Austin, TX (US);
Abstract
Open loop common mode driver for switched capacitor input to SAR. A method for selectively switching capacitors in a SAR capacitor array that have a common plate thereof interfaced to the input of a comparator. The method includes the step of first initiating a SAR compare cycle. Then. the other plates the capacitors switched such that they are disposed at either a first capacitor reference voltage or a second capacitor reference voltage in a combination and sequence of switching operations defined by a successive approximation search algorithm. Each switching operation in the sequence requires, after the step of switching, a comparison of the voltage input to the comparator with a compare reference voltage after a predetermined settling time from the time the capacitor combination for the switching operation has been switched. The duration of the settling time is controlled for each of the switching operations in the sequence such that at least two of the durations are different.