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:
May. 23, 2023
Filed:
Mar. 30, 2022
Applicant:
Nxp B.v., Eindhoven, NL;
Inventors:
Ulrich Moehlmann, Moisburg, DE;
Kai Hendrik Misselwitz, Hanburg, DE;
Assignee:
NXP B.V., Eindhoven, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03L 7/099 (2006.01); H03L 7/081 (2006.01); H03L 7/093 (2006.01); H03L 7/083 (2006.01);
U.S. Cl.
CPC ...
H03L 7/0818 (2013.01); H03L 7/083 (2013.01); H03L 7/093 (2013.01); H03L 7/0991 (2013.01); H03L 2207/50 (2013.01);
Abstract
A fractional-N all digital phase locked loop (ADPLL) includes a randomly modulated delay having a triangular distribution to a frequency reference at an input of the fractional-n ADPLL to reduce spurious tones introduced by delta-sigma modulation of a frequency control word without requiring active control or calibration. In some embodiments, a delay line generates the randomly modulated delay based on a uniformly distributed random number with a flat spectrum that is shaped by a high pass filter.