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:
Feb. 28, 2006
Filed:
May. 11, 2004
Ian Galton, Del Mar, CA (US);
Ian Galton, Del Mar, CA (US);
The Regents of the University of California, Oakland, CA (US);
Abstract
Devices for performing analog-to-digital conversion with reduced noise. In one implementation, an analog-to-digital converter includes at least one internal digital-to-analog converter (DAC) that comprises a plurality of analog components and converts an intermediate digital signal into an associated intermediate analog signal, a dynamic element matching (DEM) circuit coupled to the DAC to permute configurations of the analog components within the DAC, a noise cancellation circuit and a digital subtractor block. The noise cancellation circuit is coupled to receive a first digital sequence comprising a component of a digitized representation of an analog output of the DAC, and a second digital sequence representing a state of the DEM circuitry. The noise cancellation circuit is operable to combine the first and the second digital sequences so as to estimate a digital representation of a DAC noise caused by error sequence introduced mismatches among the analog components within the DAC. The digital subtractor block is coupled to the noise cancellation circuit and operable to use the estimated digital representation of the DAC noise to reduce the DAC noise.