Cascade low-pass filter to improve xDSL band attenuation for POTS splitter
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United States of America Patent
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Feb 8, 2005
Grant Date -
Jun 19, 2003
app pub date -
Apr 10, 2002
filing date -
Dec 14, 2001
priority date (Note) -
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Abstract
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.
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