Invention Grant
- Patent Title: Spread spectrum control PLL circuit and its start-up method
- Patent Title (中): 扩频控制PLL电路及其启动方式
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Application No.: US12595008Application Date: 2008-03-18
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Publication No.: US07986175B2Publication Date: 2011-07-26
- Inventor: Tsuyoshi Ebuchi , Yoshihide Komatsu , Michiyo Yamamoto
- Applicant: Tsuyoshi Ebuchi , Yoshihide Komatsu , Michiyo Yamamoto
- Applicant Address: JP Osaka
- Assignee: Panasonic Corporation
- Current Assignee: Panasonic Corporation
- Current Assignee Address: JP Osaka
- Agency: McDermott Will & Emery LLP
- Priority: JP2007-143261 20070530; JP2007-294371 20071113
- International Application: PCT/JP2008/000639 WO 20080318
- International Announcement: WO2008/146433 WO 20081204
- Main IPC: H03L7/06
- IPC: H03L7/06
Abstract:
A calibration circuit (19) adjusts at least one of one of a charging current of a charge pump circuit (12) and a capacitance value of a filter capacitor in a loop filter circuit (13) and a gain of a voltage controlled oscillator (14), depending on a frequency of a reference clock signal input to a calibration circuit (10).
Public/Granted literature
- US20100127739A1 SPREAD SPECTRUM CONTROL PLL CIRCUIT AND ITS START-UP METHOD Public/Granted day:2010-05-27
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