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:
Jul. 02, 2013
Filed:
Sep. 13, 2012
Wen-yen Chan, Thornhill, CA;
Nasserullah Khan, Waterloo, CA;
Nagula Tharma Sangary, Waterloo, CA;
Qingzhong Jiao, Nepean, CA;
Xin Jin, Waterloo, CA;
Wen-Yen Chan, Thornhill, CA;
Nasserullah Khan, Waterloo, CA;
Nagula Tharma Sangary, Waterloo, CA;
Qingzhong Jiao, Nepean, CA;
Xin Jin, Waterloo, CA;
Research In Motion Limited, Waterloo, CA;
Abstract
A communications subsystem for a wireless device for correcting errors in a reference frequency signal. The communications subsystem comprises a frequency generator for generating the reference frequency signal and a closed loop reference frequency correction module that generates a reference frequency adjustment signal for correcting the reference frequency signal when the communications subsystem operates in closed loop mode. The subsystem further includes an open loop frequency correction means that that samples values of the reference frequency adjustment signal during the closed loop mode and generates a frequency correction signal for correcting the reference frequency signal when the communications subsystem operates in a mode other than closed loop mode.