发明申请
- 专利标题： Frequency Detector and Phase Locked Loop Having the Same
- 专利标题（中）： 频率检测器和相位锁相环
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申请号： US12430691申请日： 2009-04-27
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公开(公告)号： US20090310730A1公开(公告)日： 2009-12-17
- 发明人: Sergey Zhidkov , Jun Ho Huh , Ki Seop Kwon
- 申请人： Sergey Zhidkov , Jun Ho Huh , Ki Seop Kwon
- 优先权： KR10-2008-0054626 20080611
- 主分类号： H04L7/00
- IPC分类号： H04L7/00 ; G01R23/02 ; H03K9/06 ; H03L7/06 ; H03L7/00 ; G01R31/26 ; G01R23/00
摘要：
A frequency detector includes an error measurement unit measuring a time interval between zero-crossing points of an input signal that is modulated. An error conversion unit quantizes the measured time interval using one of modulation time intervals. An error calculation unit calculates a frequency error based upon a difference between the measured time interval and the quantized time interval. An error generation control unit controls whether to output the frequency error based upon the quantized time interval, the calculated frequency error, and a predetermined critical value.
公开/授权文献
- US08331519B2 Frequency detector and phase locked loop having the same 公开/授权日：2012-12-11
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