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:
Aug. 12, 2014
Filed:
Aug. 22, 2011
Yong Quan, Chengdu, CN;
Guosheng Wu, Chengdu, CN;
Yong Quan, Chengdu, CN;
Guosheng Wu, Chengdu, CN;
IPGoal Microelectronics (SiChuan) Co., Ltd., Chengdu, Sichuan Province, CN;
Abstract
A frequency detector includes a multi-phase clock generation unit, a sampling unit connected to the multi-phase clock generation unit and a digital logic unit connected to the sampling unit. An inputted single-phase clock is received by the multi-phase clock generation unit and transformed into a multi-phase clock. Inputted random data are received by the sampling unit and sampled by the multi-phase clock. Each data bit of the random data is divided into several sampling intervals according to a phase number of the multi-phase clock. The digital logic unit analyzes sampling values logically, judges the corresponding sampling interval of each sampling value and outputs signals for indicating that a frequency of the random data is higher or lower than the frequency of the single-phase clock based on differences in the corresponding sampling intervals of the sampling values at two adjacent times. A method for detecting frequencies is further provided.