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:
Jul. 14, 1998
Filed:
Mar. 19, 1996
Sherman Weisbrod, Skillman, NJ (US);
Thomson multimedia S.A., Boulogne, FR;
Abstract
In a switched capacitor type digital-to-analog (D/A) converter, a group of n bits of the binary word are applied to n parallel branches of the D/A converter, respectively. In a given branch, the corresponding bit is applied to a control terminal of a corresponding switch associated with a corresponding switched capacitor. Depending on the logic level of the bit, the switched capacitor is charged to a reference voltage or remains discharged. Then, the switched capacitor of the given branch is coupled by a transfer switch in parallel with a summing capacitor to provide for charge redistribution. The capacitances of the switched capacitor and of the summing capacitor are equal. The time allocated for either discharging the switched capacitor or charge redistribution is made shorter than the time allocated for charging the capacitor. Charging/discharging the capacitor is accomplished via a common transistor.