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:
Nov. 22, 2011
Filed:
Dec. 31, 2007
Kwan-dong Kim, Kyoungki-do, KR;
Kwan-Dong Kim, Kyoungki-do, KR;
Hynix Semiconductor Inc., , KR;
Abstract
A phase locked loop can reduce a locking time, thereby efficiently reducing power in a locking operation. The phase locked loop includes a phase detector, a control voltage generator, a voltage controlled oscillator and a start-up driver. The phase detector detects a phase difference between a reference clock and a feedback clock to generate a detection signal corresponding to the detected phase difference. The control voltage generator generates a control voltage having a voltage level corresponding to the detection signal. The voltage controlled oscillator generates an internal clock having a frequency corresponding to a voltage level of the control voltage. The start-up driver drives a control voltage terminal to a predefined start-up level in response to a start-up level multiplex signal corresponding to a frequency of the reference clock prior to activation of the voltage controlled oscillator.