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:
Nov. 12, 2013
Filed:
May. 04, 2011
Yan Wang, Tucson, AZ (US);
Timothy V. Kalthoff, Tucson, AZ (US);
Michael A. Wu, Audubon, PA (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A switched-capacitor circuit (orA) samples a first signal (V) onto a first capacitor (Cor C) by switching a top plate thereof via a summing conductor () to a first reference voltage (V) and switching a bottom plate thereof to the first signal. A second signal (V) is sampled onto a second capacitor (Cor C) by switching a top plate thereof to the second signal and switching a bottom plate thereof to the first reference voltage. After the sampling, the top plate of the second capacitor is coupled to the top plate of the first capacitor. The bottom plate of the second capacitor is coupled to the first reference voltage. The bottom plate of the first capacitor is coupled to a second reference voltage (Vor V), to thereby cancel at least a portion of a common mode input voltage component from the first conductor (), hold the sampled differential charge on the summing conductor and establish a predetermined common mode voltage thereon, and prevent the summing conductor from having a voltage which allows the leakage of charge therefrom. The switched-capacitor circuit may be a SAR, an integrator, or an amplifier.