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:
Mar. 05, 2002
Filed:
Apr. 17, 1998
Mats Wilhelmsson, Hägersten, SE;
Peter Lundh, Skärholmen, SE;
Clarence Fransson, Älvsjö, SE;
Anders Bjenne, Huddinge, SE;
Telefonaktiebolaget LM Ericsson (publ), Stockholm, SE;
Abstract
A phase-locked loop having very fast acquisition, and low output phase jitter and stability at steady-state is provided. In general, the phase-locked loop is used for synchronizing an output signal of said phase-locked loop with an input reference signal. The filter circuit of the phase-locked loop includes a differentiator responsive to the phase difference representing signal from a phase detector in the PLL for providing a differentiated signal, and a filter responsive to both the phase difference representing signal and the differentiated signal to provide a filter output signal. Preferably, the filter is a low-pass filter. The output signal source of the PLL is controlled by a control signal which is generally based on the filter output signal.