公开(公告)号：US20050040864A1

公开(公告)日：2005-02-24

申请号：US10604799

申请日：2003-08-18

申请人： Westerfield Ficken ,  Louis Hsu ,  James Mason ,  Phil Murfet

发明人： Westerfield Ficken ,  Louis Hsu ,  James Mason ,  Phil Murfet

IPC分类号： G05F1/10 ,  H03K5/08 ,  H03K5/19 ,  H03K5/22 ,  H04L25/02 ,  H04L25/08

CPC分类号： H03K5/19 ,  H03K5/08 ,  H04L25/0272 ,  H04L25/085

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.

摘要翻译： 提供一种用于检测由一对差分信号线携带的差分信号的损耗的装置和方法。 根据该方法，从该对差分信号线上的电压检测共模电平。 产生阈值电平，参考检测到的共模电平。 信号电平由一对差分信号线上的电压产生，信号电平在第一时间段内被平均化。 从阈值电平和检测到的共模电平产生参考电平，在比第一时间段长的第二时间段内平均参考电平。 将信号电平与参考电平进行比较，以确定信号对是否存在于该对差分信号线上。