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:
Mar. 24, 2009
Filed:
Jul. 06, 2007
Anthony James Magrath, Edinburgh, GB;
Anthony James Magrath, Edinburgh, GB;
Wolfson Microelectronics plc, Edinburgh, GB;
Abstract
In a dynamic element matching stage of a digital-to-analogue converter, in which a pair of quantizer outputs are generated, and are constrained such that their sum is equal to the parity of a received bit value, steps are taken to improve baseband noise performance. Each of the quantizers has a feedback loop associated with it, and the performance is improved by determining the quantizer outputs based on these loop values, in order to reduce the overall quantization noise. However, during time periods when these loop values are equal, there are two possible pairs of quantizer outputs that could be chosen, without adversely impacting on the overall quantization noise. the quantizer outputs are monitored during such time periods, and steps are taken to control the quantizer outputs during such time periods, in order to ensure that the two possible pairs of quantizer outputs are chosen with equal probability.