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:
Jun. 27, 2000
Filed:
Dec. 13, 1996
Johan Jansson, Ljustero, SE;
Telefonaktiebolaget LM Ericsson, Stockholm, SE;
Abstract
A discrete phase-locked loop and method for supporting global synchronization of data communications in a mobile communications system is disclosed. In order to provide for air frame synchronization, air frame data clocks and a synchronization signal must be phase locked to a global time reference signal. This is accomplished through a fully discrete phase lock loop in ASIC or software wherein a state machine is clocked by a high frequency, high accuracy, fixed frequency source already available in the radio terminal equipment. The state machine generates the required air frame data clocks and synchronization signals by completing a counter cycle. At regular intervals, this counter can skip, or double step, for one count to adjust the output phase closer to the phase of the reference signal. The interval for which this correction is maintained is settable by an interval counter. This implementation mimics an elliptic low pass filter.