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:
Sep. 20, 2005
Filed:
Oct. 25, 2004
Ola Andersson, Svedala, SE;
Jacob Wikner, Vikingstad, SE;
Ola Andersson, Svedala, SE;
Jacob Wikner, Vikingstad, SE;
Telefonaktiebolaget L M Ericcson, Stockholm, SE;
Abstract
The values X(n) input to a current-steering digital-to-analog converter () are modified () before the actual conversion to compensate for conversion errors of the digital-to-analog converter. The input values are modified according to a model () of the digital-to-analog converter in which each output value of the digital-to-analog converter Y(n) is a sum of a desired value directly proportional to the respective input value and an error. The error is a product of the settled output value, i.e. the difference between the desired value and the previous output value Y(n−1) actually provided by the digital-to-analog converter, and a relative step error that is a function only of the respective input signal and is stored in a table. The relative step error can be a function also of the previous output signal and of the previous input signal. This model has a low complexity and is suitable for on-chip implementation.