发明申请
US20070241798A1 DELAY LOCKED LOOP HAVING CHARGE PUMP GAIN INDEPENDENT OF OPERATING FREQUENCY
有权
具有充电泵的延迟锁定环路与运行频率无关
- 专利标题: DELAY LOCKED LOOP HAVING CHARGE PUMP GAIN INDEPENDENT OF OPERATING FREQUENCY
- 专利标题(中): 具有充电泵的延迟锁定环路与运行频率无关
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申请号: US11279446申请日: 2006-04-12
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公开(公告)号: US20070241798A1公开(公告)日: 2007-10-18
- 发明人: Charles Masenas
- 申请人: Charles Masenas
- 主分类号: H03L7/06
- IPC分类号: H03L7/06
摘要:
A delay looked loop (DLL) having a charge pump gain independent of the operating frequency of the DLL. A charge pump is disclosed for providing a charge to a capacitive element on a voltage controlled delay line, wherein the charge is independent of a control voltage step cycle time of the DLL, the charge pump includes: a charge/dump signal generation stage that generates a charge signal and a dump signal during each period of a reference clock signal; a first switched capacitor stage that charges a first capacitor in response to the charge signal and dumps a positive charge from the first capacitor in response to the dump signal; a second switched capacitor stage that charges a second capacitor in response to the charge signal and dumps a negative charge from the second capacitor in response to the dump signal; and an output stage that selectively loads either the positive charge or the negative charge to the capacitive element on the voltage controlled delay line in response to an input signal from a phase detector.
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