De-emphasizing cable equalizer

Details De-emphasizing cable equalizer De-emphasizing cable equalizer

2008-04-11

2011-12-20

Payne, David C. (Department: 2611)

Pulse or digital communications

Equalizers

C342S151000, C375S233000, C375S234000, C381S103000, C386S269000, C708S323000

Reexamination Certificate

active

08081675

ABSTRACT:
In accordance with the teachings described herein, an extended equalizer circuit is provided for equalizing a digital communication signal transmitted over a transmission medium that causes a frequency-dependent attenuation of the digital communication signal. An equalizer may be used that includes a linear equalization circuit and a non-linear equalization circuit, the linear equalization circuit being configured to apply a linear filter to the digital communication signal to compensate for the frequency-dependent attenuation caused by a first portion of the transmission medium, and the non-linear equalization circuit being configured to apply one or more non-linear operations to the digital communication signal. A de-emphasizing equalizer circuit may be coupled in series between the transmission medium and the equalizer and configured to apply an additional linear filter to the digital communication signal in order to compensate for the frequency-dependent attenuation caused by a second portion of the transmission medium.

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Maxim, “1Gbps to 12.5Gbps Passive Equalizer for Backplanes and Cables”, Maxim Integrated Products, Sunnyvale, California, 2005, 15 pages.
National Semiconductor, “DS80EP100 5 to 12.5 Gbps, Power-Saver Equalizer for Backplanes and Cables”, Jul. 2007, 14 pages.
PCT/CA2008/000676 International Search Report dated Jul. 28, 2008, 3 pages.

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