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:
Jan. 01, 2008
Filed:
Mar. 31, 2004
Douglas Holberg, Wimberly, TX (US);
Ka Y. Leung, Austin, TX (US);
Douglas Holberg, Wimberly, TX (US);
Ka Y. Leung, Austin, TX (US);
Silicon Labs CP, Inc., Austin, TX (US);
Abstract
Gain control for delta sigma analog-to-digital converter. A method is disclosed for driving the input of an integrator in a delta-sigma converter having an amplifier with a non-inverting input, an output and a positive input connected to a reference voltage and an integration capacitor connected between the non-inverting input and the output. An input voltage is sampled at a first rate onto an input sampling capacitor and then charge is dumped from the input sampling capacitor to the non-inverting input of the amplifier at a second time and at the first rate. A reference voltage is sampled onto a feedback sampling capacitor at substantially the first rate, and charge stored on the feedback sampling capacitor is dumped to the non-inverting input of the amplifier at a second rate different than the first rate. The amount of time that charge is dumped from the feedback sampling capacitor is controlled to be substantially equal to the amount of time that charge is being dumped from the input sampling capacitor, wherein varying the second rate relative to the first rate changes the gain of delta-sigma converter.