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:
Sep. 01, 2026
Filed:
Dec. 18, 2022
Cirrus Logic International Semiconductor Ltd., Edinburgh, GB;
Arashk Norouzpourshirazi, Austin, TX (US);
CIRRUS LOGIC, INC., Austin, TX (US);
Abstract
Switched-capacitor circuits having reduced charge injection offset are implemented by differentially interchanging pairs of charge transfer switches of the switched-capacitor circuit at a frequency other than the sampling frequency of the switched-capacitor circuit, thereby chopping the switch signal paths. The circuits include a pair of capacitors, a switching circuit that alternatively charges the pair of capacitors from a differential input and transfers the charge from the pair of capacitors, according to corresponding phases of a reference sampling clock. The circuits also include a chopping circuit that alternates differential connections to at least some of the switches. The chopping circuit is operated at a chopping frequency, so that DC offset caused by charge-injection in the switching circuit due to the reference sampling clock coupling through the switches of the switching circuit is removed by modulating the charge injection of the switching circuit away from DC.