发明名称 |
Serial digital data communications receiver with improved automatic cable equalizer, AGC system, and DC restorer |
摘要 |
A serial digital data communications receiver with an improved automatic cable equalizer that is less susceptible to jitter and has greater multi-standards capability, and an improved automatic gain control system with a DC restorer that provides optimal edge jitter performance while avoiding the possibility of a latch-up condition at the start of data transmission. The automatic cable equalizer for equalizing signals received over cables of different lengths has multiple stages each having a transfer function of 1+Ki[fi(jomega)] wherein each of the Ki vary in accordance with a sequential gain control methodology. The AGC system uses the difference between band-pass filtered versions of the amplitudes of the input and output of a DC restorer based on quantized feedback, to regulate the AGC circuit. The DC restorer comprises a comparator for generating a quantized output and further clamps the input with a clamping circuit so that a version of the quantized output is fed back to the input while avoiding the possibility of operational failure of the comparator at the onset of data transmission.
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申请公布号 |
US6501792(B2) |
申请公布日期 |
2002.12.31 |
申请号 |
US20010946799 |
申请日期 |
2001.09.06 |
申请人 |
GENNUM CORPORATION |
发明人 |
WEBSTER STEPHEN PAUL |
分类号 |
H04B3/04;H03G3/30;H03G5/00;H04L25/06;(IPC1-7):H03H7/30 |
主分类号 |
H04B3/04 |
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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