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:
Sep. 03, 2002
Filed:
Sep. 26, 2000
Applicant:
Inventors:
Jens Peter Eilken, Munich, DE;
Harry Siebert, Germering, DE;
Assignee:
Siemens Aktiengesellscaft, Munich, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03L 7/087 ; H03L 7/099 ; H03L 7/18 ;
U.S. Cl.
CPC ...
H03L 7/087 ; H03L 7/099 ; H03L 7/18 ;
Abstract
For controlling frequency and phase of an output clock signal dependent on a reference signal, a digital phase locked loop comprises a ring oscillator connected to a switch-over unit for generating the output clock signal. The ring oscillator has a plurality of serially arranged delay units. A phase comparator for comparing the phase of the reference signal and of the output clock signal. At least one switchable frequency divider unit is provided between the phase comparator and the output clock signal. A control unit controls the ring oscillator frequency by cut-in or cut-outs of delay units with the assistance of the switchover unit.