公开(公告)号：US20050070228A1

公开(公告)日：2005-03-31

申请号：US10910155

申请日：2004-08-02

申请人： Susuma Hara ,  Mark Callicotte

发明人： Susuma Hara ,  Mark Callicotte

IPC分类号： H04B1/00 ,  H04B1/04 ,  H04B1/10 ,  H04B3/23 ,  H04B3/32 ,  H04B5/00 ,  H04B15/00 ,  H04Q20060101

CPC分类号： H04B3/23 ,  H04B3/32

摘要： Interference reduction with a current-mode transversal filter having taps including binary current sources is provided. Each binary current source provides an output current having either of two distinct values, depending on a binary input. The product of a tap coefficient and an interference data signal value is obtained by independently generating the contribution from each interference data bit using a binary current source and providing these contributions to a current summing junction. Binary current sources can be implemented in analog, digital, or mixed-mode circuitry. Echo, near end cross talk, and far end cross talk are examples of interference that can be reduced in this manner. The use of binary current sources provides significant flexibility, especially in connection with multilevel modulation schemes such as pulse amplitude modulation (PAM).

公开(公告)号：US06934265B2

公开(公告)日：2005-08-23

申请号：US10910155

申请日：2004-08-02

申请人： Susuma Hara ,  Mark Callicotte

发明人： Susuma Hara ,  Mark Callicotte

IPC分类号： H04B1/00 ,  H04B1/04 ,  H04B1/10 ,  H04B3/23 ,  H04B3/32 ,  H04B5/00 ,  H04B15/00 ,  H04Q20060101

CPC分类号： H04B3/23 ,  H04B3/32

摘要： Interference reduction with a current-mode transversal filter having taps including binary current sources is provided. Each binary current source provides an output current having either of two distinct values, depending on a binary input. The product of a tap coefficient and an interference data signal value is obtained by independently generating the contribution from each interference data bit using a binary current source and providing these contributions to a current summing junction. Binary current sources can be implemented in analog, digital, or mixed-mode circuitry. Echo, near end cross talk, and far end cross talk are examples of interference that can be reduced in this manner. The use of binary current sources provides significant flexibility, especially in connection with multilevel modulation schemes such as pulse amplitude modulation (PAM).

摘要翻译： 提供了具有包括二进制电流源的抽头的电流模式横向滤波器的干扰减少。 根据二进制输入，每个二进制电流源提供具有两个不同值之一的输出电流。 抽头系数和干扰数据信号值的乘积是通过使用二进制电流源独立地产生来自每个干扰数据位的贡献，并将这些贡献提供给电流求和结点。 二进制电流源可以在模拟，数字或混合模式电路中实现。 回波，近端串扰和远端串扰是可以以这种方式减少的干扰的示例。 使用二进制电流源提供了显着的灵活性，特别是与诸如脉冲幅度调制（PAM）的多电平调制方案有关。