发明名称 |
Apparatus for reducing jitter of a spectrum spread clock signal and method therefor |
摘要 |
An accumulator stores a signal representation of an accumulated angle that is incremented by an input angle in response to a reference clock pulse. The most significant bit (MSB) of the accumulated angle signals drives the input of a phase locked loop of the type that includes a loop filter, a frequency divider and a voltage controlled oscillator (VCO). A charge is injected into the loop filter during an overshoot interval during which the output of the frequency divider differs from the MSB. A compensating charge is injected into the loop filter to compensate for the charge injected during the overshoot interval. Jitter free spectrum spread clock pulses are provided by the VCO in response to the MSB.
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申请公布号 |
US5651035(A) |
申请公布日期 |
1997.07.22 |
申请号 |
US19950430575 |
申请日期 |
1995.04.28 |
申请人 |
INTERNATIONAL MICROCIRCUITS, INC. |
发明人 |
TOZUN, ORHAN;MCCUNE, JR., EARL WILLIAM |
分类号 |
H03L7/18;(IPC1-7):H04L7/00;H04L25/36;H04L25/40 |
主分类号 |
H03L7/18 |
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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