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. 11, 2020
Filed:
Aug. 30, 2018
Applicant:
University College Cork—national University of Ireland, Cork, Cork, IE;
Inventors:
Hongjia Mo, Cork, IE;
Michael Peter Kennedy, Cork, IE;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03L 7/197 (2006.01); H03M 7/36 (2006.01); H03M 3/00 (2006.01); H03L 7/093 (2006.01);
U.S. Cl.
CPC ...
H03L 7/1976 (2013.01); H03M 3/438 (2013.01); H03M 7/3022 (2013.01); H03L 7/093 (2013.01);
Abstract
A nested mixed-radix DDSM can guarantee zero systematic frequency error when used as a divider controller in a fractional-N frequency synthesizer is described. This disclosure presents a nested cascaded mixed-radix DDSM architecture which can also guarantee zero systematic frequency error. In addition, the disclosure allows one to use higher order auxiliary modulators and shaped dither signal to eliminate feedthrough spurs completely. By increasing the number of levels in the cascade, the moduli of the individual modulator stages can be reduced, thereby increasing the speed of the synthesizer.