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. 08, 2004
Filed:
Jan. 03, 2002
Siegfried Hart, Kleinhoehenrain, DE;
Heinz Werker, Huglfing, DE;
Infineon Technologies AG, Munich, DE;
Abstract
A digital phase detector compares the output clock signal of the oscillator with the reference clock signal, an analog phase detector, and a lock detection circuit connected to a digital phase detector and an analog phase detector for avoiding a phase quantization error. The lock detection circuit activates the analog phase detector to run simultaneously with a digital phase detector if the phase error is zero. The activated analog phase detector regulates the output clock signal of the digitally controllable oscillator in a continuously variable manner until the respective clock signal edges of the output clock signal and the reference clock signal are fully synchronous. The lock detection circuit deactivates the analog phase detector and continuously checks and regulates the digital phase detector until the phase error between the output clock signal and the reference clock signal is zero.