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:
Dec. 25, 2012
Filed:
Jan. 11, 2011
Vincent Quiquempoix, Divonne les Bains, FR;
Yann Johner, Preverenges, CH;
Gabriele Bellini, Froideville, CH;
Vincent Quiquempoix, Divonne les Bains, FR;
Yann Johner, Preverenges, CH;
Gabriele Bellini, Froideville, CH;
Microchip Technology Incorporated, Chandler, AZ (US);
Abstract
A sigma-delta modulator has a chopper voltage reference providing a reference signal having a clock dependent offset voltage, a single-bit or a multi-bit digital-to-analog converter (DAC); a plurality of capacitor pairs; a plurality of switches to couple any capacitor pair to an input or reference signal; and a control unit controlling sampling through said switches to perform a charge transfer in two phases wherein any capacitor pair can be selected to be assigned to the input or reference signal, wherein after a plurality of charge transfers a gain error cancellation is performed by rotating the capacitor pairs cyclically, and wherein a DAC output value and a reference offset state define switching sequences wherein each switching sequence independently rotates said capacitor pairs and wherein at least one switching sequence is selected depending on a current DAC output value and a current reference offset state.