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:
Dec. 23, 2014
Filed:
Apr. 18, 2014
Richtek Technology Corp, Hsinchu, TW;
Richtek Technology Corp, Hsinchu, TW;
Abstract
A phase/frequency detector module, applicable to a digital phase-locked loop, includes: an edge detector for receiving a reference clock signal and a counting clock signal, where when a positive edge of the counting clock signal occurs, if a positive edge of the reference clock signal has occurred, the edge detector outputs an edge-detected signal, else the edge detector outputs an edge-not-detected signal; a counter coupled to the edge detector, where if receiving the edge-detected signal, the counter outputs a counting result forming a frequency error signal, resets, and loads a count value, and if receiving the edge-not-detected signal, the counter continues to count on the positive edge of the counting clock signal; and a frequency phase converter for performing integration over the counting result, where the integral forms a phase error signal.