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. 07, 2004
Filed:
Feb. 05, 2003
Freescale Semiconductor, Inc., Austin, TX (US);
Abstract
A method for selecting cells in response to input codes of a digital-to-analog converter distributes noise based on cyclicality of selection patterns to reduce its value, without being dependent upon the input codes. A 6-bit current output type digital-to-analog converter has 63 current source cells C through C . A prime number of, or 61, current source cells are used as cyclically selected cells. That is, 61 current source cells C -C , ranging from the second left-most current source cell C to the second right-most current source cell C , are used as cyclically selected cells. The remaining left-most current source cell C and right-most current source cell C are used as non-cyclically selected cells. The cyclically selected cells, including the 61 current source cells, are selected in response to input codes using a Data Weighted Average (DWA) technique.