发明申请
US20030112960A1 Cascade low-pass filter to improve xDSL band attenuation for POTS splitter
有权
级联低通滤波器，以改善POTS分离器的xDSL频带衰减
- 专利标题： Cascade low-pass filter to improve xDSL band attenuation for POTS splitter
- 专利标题（中）： 级联低通滤波器，以改善POTS分离器的xDSL频带衰减
-
申请号： US10119485申请日： 2002-04-10
-
公开(公告)号： US20030112960A1公开(公告)日： 2003-06-19
- 发明人: Jie Dong Wang
- 申请人： ADC DSL Systems, Inc.
- 申请人地址： null
- 专利权人： ADC DSL Systems, Inc.
- 当前专利权人： ADC DSL Systems, Inc.
- 当前专利权人地址： null
- 主分类号： H04M001/00
- IPC分类号： H04M001/00 ; H04M009/00
摘要：
Cascade low-pass filters are useful in attenuating the xDSL band in a POTS splitter. The design of the low-pass filter is a sixth-order filter having two stages. A first stage includes a fourth-order filter, preferably with a stop-band frequency of approximately 48 kHz. A second stage includes a second-order filter in cascade with the fourth-order filter. For this filter, the stop-band frequency is preferably approximately 29 kHz. The inductance value of the second stage is relatively small in comparison to the inductance values of the first stage. In this manner, improvements in xDSL band attenuation are facilitated with little or no eroding of the voice band performance such as insertion loss, pass-band attenuation and return loss.