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:
Nov. 22, 2011
Filed:
Nov. 06, 2008
Saska Lindfors, Espoo, FI;
Kari Stadius, Helsinki, FI;
Liangge Xu, Espoo, FI;
Tapio Rapinoja, Kerava, FI;
Jussi Ryynanen, Vantaa, FI;
Risto H. S. Kaunisto, Espoo, FI;
Aarno Parssinen, Espoo, FI;
Saska Lindfors, Espoo, FI;
Kari Stadius, Helsinki, FI;
Liangge Xu, Espoo, FI;
Tapio Rapinoja, Kerava, FI;
Jussi Ryynanen, Vantaa, FI;
Risto H. S. Kaunisto, Espoo, FI;
Aarno Parssinen, Espoo, FI;
Nokia Corporation, Espoo, FI;
Abstract
Described is an apparatus that includes a frequency source and a plurality of time domain direct digital synthesizers each having an input connected to an output of the frequency source and an output providing an output frequency signal. A particular time domain direct digital synthesizer includes a sigma-delta modulator that functions as a second order multi-stage noise shaping sigma-delta modulator. In one exemplary embodiment sigma-delta modulator outputs provide a unitary-weighted word used to switch certain unit capacitors that comprise part of a delay modulator to produce a time-varying delay having a time-averaged value that directly corresponds to a binary value appearing on a plurality of phase accumulator outputs.