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:
Oct. 31, 2006
Filed:
May. 24, 2002
Applicants:
Jacob Midtgaard, Frederiksberg, DK;
Oluf Bagger, Copenhagen, DK;
Inventors:
Jacob Midtgaard, Frederiksberg, DK;
Oluf Bagger, Copenhagen, DK;
Assignee:
Nokia Corporation, Espoo, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03L 7/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A phase-locked loop circuit has an output amplifier () and a main feedback path from the output of the output amplifier (). A subsidiary feedback path is provided directly from the output of the circuit's VCO (). At the start of operation, the output amplifier () is disabled and the subsidiary feedback path is used until lock is achieved. Then the output amplifier () is enabled and the main feedback loop is used. This avoids spurious outputs from the outer amplifier while to loop locks.