发明名称 |
Quotient phase-shift processor for digital phase-licked-loops. |
摘要 |
<p>A quotient phase-shift processor is provided which includes novel techniques for realizing phase corrections of a digital phase-locked-loop. A binary phase-detector of the "early-late" type is combined with range-phase-detector circuitry to generate a variable lock acquisition speed. Phase measure and speed control are performed by incremental manipulation which feeds a novel "quotient" processor. The quotient processor integrates the incremental phase errors and performs phase corrections in a nonperiodic fashion, resulting in lower effective proportional loop gain than that provided in standard phase-locked-loops. Wide capture-range and low jitter are obtained by dynamically varying a loop time constant. Pattern dependent noise is reduced by a novel gating technique. High crystal-frequency requirements are reduced, extending the spectral application of digital phase-locked-loops.</p> |
申请公布号 |
EP0311973(A2) |
申请公布日期 |
1989.04.19 |
申请号 |
EP19880116847 |
申请日期 |
1988.10.11 |
申请人 |
NATIONAL SEMICONDUCTOR CORPORATION |
发明人 |
GUINEA, JESUS;WONG, HEE |
分类号 |
H03L7/093;H03L7/099;H04L7/033;H03L7/06 |
主分类号 |
H03L7/093 |
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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