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:
Jul. 14, 2015
Filed:
Oct. 15, 2014
Ipgoal Microelectronics (Sichuan) Co., Ltd., Chengdu, Sichuan, CN;
Ziche Zhang, Sichuan, CN;
IPGoal Microelectronics (Sichuan) Co., Ltd., Chengdu, Sichuan Province, CN;
Abstract
A frequency locking system for locking a clock frequency in a CDR circuit without crystal oscillator is provided. Reference data information is inputted into a first low-pass filter; the first low-pass filter is connected to a first swing detector; the first swing detector is connected to a non-inverting terminal of a comparator; an output terminal of the comparator is connected to a charge pump; the charge pump is connected to a first terminal of a capacitor; the capacitor is grounded. The capacitor is also connected to a voltage-controlled oscillator; the voltage-controlled oscillator is connected to a code pattern conversion generator; the code pattern conversion generator is connected to of a second low-pass filter; the second low-pass filter is connected to an input terminal of a second swing detector; an output terminal of the second swing detector is connected to an inverting terminal of the comparator.