发明名称 |
APPARATUS AND METHOD FOR DETECTING LOSS OF HIGH-SPEED SIGNAL |
摘要 |
An apparatus and method is provided for detecting loss of differential signal carried by a pair of differential signal lines. According to the method, a common mode level is detected from voltages on the pair of differential signal lines. A threshold level is generated, referenced to the detected common mode level. A signal level is generated from the voltages on the pair of differential signal lines, the signal level being averaged over a first period of time. From the threshold level and the detected common mode level a reference level is generated, the reference level being averaged over a second period of time longer than then the first period of time. The signal level is compared to the reference level to determine if a signal is present on the pair of differential signal lines.
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申请公布号 |
US2005040864(A1) |
申请公布日期 |
2005.02.24 |
申请号 |
US20030604799 |
申请日期 |
2003.08.18 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
FICKEN WESTERFIELD J.;HSU LOUIS L.;MASON JAMES S.;MURFET PHIL J. |
分类号 |
G05F1/10;H03K5/08;H03K5/19;H03K5/22;H04L25/02;H04L25/08;(IPC1-7):H03K5/22 |
主分类号 |
G05F1/10 |
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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