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. 20, 2007
Filed:
Aug. 03, 2005
Mostafa Ghazali, Grenoble, FR;
Jouffre Pierre-olivier, Grenoble, FR;
Mostafa Ghazali, Grenoble, FR;
Jouffre Pierre-Olivier, Grenoble, FR;
STMicroelectronics S.A., Montrouge, FR;
Abstract
A frequency synthesizer is provided with a PLL, including a divider by N circuit and a phase generation circuit which is connected to the output of the VCO of the PLL. The phase generation circuit generates a predetermined number of phases synchronized on the frequency of the VCO and at intervals from each other equal to a time difference representative of a phase error measured by a phase comparator of the PLL. A signal generation circuit provides an intermediate signal starting from the phases, the period of which is dependent on the time difference and a first adjustment parameter. The intermediate signal is applied to the divider by N circuit. A correction circuit determines the phase error accumulated during N−1 periods of the intermediate signal and makes a correction of the intermediate signal every N periods of the intermediate signal as a function of the accumulated phase error such that the loop becomes stable.