Filtering, equalization, and powers estimation for enabling higher speed signal transmission

a technology of filtering and equalization, applied in pulse manipulation, pulse technique, instruments, etc., can solve the problems of high power consumption and prevent the use of digital fir filters

Inactive Publication Date: 2008-07-03
LIN XIAOFENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This solution enables efficient equalization and power estimation for high-speed signal transmission, reducing noise enhancement and improving adaptation accuracy, thus supporting higher data speed transmissions.

Problems solved by technology

Unfortunately, comparatively large circuit area, high power consumption and speed limitations of analog-to-digital converters (ADC) have prevented digital FIR filters from being used in high frequency (e.g., Gbps range) data equalizer designs

Method used

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  • Filtering, equalization, and powers estimation for enabling higher speed signal transmission
  • Filtering, equalization, and powers estimation for enabling higher speed signal transmission
  • Filtering, equalization, and powers estimation for enabling higher speed signal transmission

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Embodiment Construction

[0020]While this invention is susceptible of embodiment in many different forms, there is shown in the drawings and will herein be described in detail specific embodiments, with the understanding that the present disclosure of such embodiments is to be considered as an example of principles and not intended to limit the invention only to the specific embodiments shown and described. In the description below, like reference numerals are used to describe the same, similar or corresponding parts in the several views of the drawings.

[0021]The term “another”, as used herein, is defined as at least a second or more. The terms “including” and / or “having”, as used herein, are defined as comprising at least the items described, although more than the described items may also be comprised (i.e., open language). The terms “coupled” and “connected”, as used herein are synonymously defined as operatively connected, although not necessarily directly, and not necessarily mechanically. Thus, two de...

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Abstract

An equalizer consistent with certain embodiments has a differential analog tapped delay line made of a plurality of N series connected analog delay cells. Each cell has a pair of differential inputs and a pair of differential outputs. The delay line receives an input signal to be equalized. The differential input pair of the nth cell is connected to the differential output pair of the (n−1)th cell such that current is mirrored from the output pair to the input pair to form N−1 differential taps. Each one of N−1 differential input multiplying digital to analog converters (MDAC) is connected at its differential input at each differential tap, with each MDAC multiplying an analog signal at its input by a digital weighting factor to produce an output at a differential output. A differential slicer receives a sum of the differential outputs from each of the MDACs and produces an equalized output. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.

Description

REFERENCE TO RELATED DOCUMENTS[0001]This application is a divisional application of allowed U.S. patent application Ser. No. 10 / 719,539 filed Nov. 21, 2003, which is hereby incorporated by reference. This application is related to “Pulse Extraction: A Digital Power Spectrum Estimation Method for Adaptation of Gbps Equalizers”, by Xiaofeng Lin, et al, Proceedings of the IEEE International Symposium on Circuits and Systems, May 25-28, 2003; and to “A CMOS Analog Continuous-Time FIR Filter for 1 Gbps Cable Equalizer”, by Xiaofeng Lin, et al, Proceedings of the IEEE International Symposium on Circuits and Systems, May 25-28, 2003, which are hereby incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates generally to high-speed signal transmission technology, and more particularly to improved filtering, equalization, and power estimation that enable higher speed signal transmission.BACKGROUND OF THE INVENTION[0003]Digital or analog equalizers have been w...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): H04L27/01G06G7/00
CPCH04L27/01
InventorLIN, XIAOFENGLIU, JIN
OwnerLIN XIAOFENG