发明名称 |
SPARK CURRENT CANCELLATION IN CHARGE PUMP OF HIGH SPEED PHASE LOCK LOOP CIRCUIT |
摘要 |
A structure and associated method to control spark current in a phase lock loop circuit. The phase lock loop circuit includes a voltage controlled oscillator, a phase comparator circuit, and a charge pump circuit. The voltage controlled oscillator is adapted to provide a first signal comprising a first frequency. The phase comparator is adapted to compare the first signal comprising the first frequency to a reference signal comprising a reference frequency. The phase comparator is further adapted to provide a control signal representing a phase difference between the first signal and the reference signal. The charge pump circuit is adapted to receive the control signal and control the voltage controlled oscillator such that a phase of the first signal equals a phase of the reference signal. The charge pump circuit is farther adapted to compensate for a spark current resulting from a switching mode of the control signal.
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申请公布号 |
US2005099213(A1) |
申请公布日期 |
2005.05.12 |
申请号 |
US20030605982 |
申请日期 |
2003.11.12 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
FENG KAI D. |
分类号 |
H03L7/06;H03L7/089;(IPC1-7):H03L7/06 |
主分类号 |
H03L7/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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