A methodology to design continuous‐time adaptive equalizers. (11th October 2016)

• Record Type: Journal Article
• Authors: Sánchez‐Azqueta, C.; Gimeno, C.; Aguirre, J.; Aldea, C.; Celma, S.
• Is Part Of: International journal of circuit theory and applications. Volume 45:Number 9(2017:Sep.)
• Page Start: 1203
• Page End: 1217
• Publication Date: 2016-10-11
• Subjects: continuous‐time adaptive equalizers -- adaptation loop filters -- high‐speed communications -- design methodology; Electric circuit analysis -- Periodicals; 621.319205
• DOI: 10.1002/cta.2271
• Languages: English
• ISSNs: 0098-9886

Abstract

Summary: Serial communications systems suffer from channel bandwidth limitations that result in eye closure and inter‐symbol interference. Adaptive equalization at the receiver is widely implemented to alleviate this, and a number of continuous‐time techniques aiming multi‐gigabit operation have been proposed. The operation of adaptive equalizers is based on signal filtering carried out by loop filters whose characteristics are usually given ad‐hoc after a trial and error process. This paper presents a unified analysis of the operation of continuous‐time adaptive equalizers that results in a general design methodology to select the frequency characteristics of the filters implemented in the adaptation loop. Using the proposed methodology, a novel adaptation loop filter combination incorporating two low‐pass filters is presented. Copyright © 2016 John Wiley & Sons, Ltd. Abstract : A general methodology to design continuous‐time adaptive equalizers is presented. It uses the frequency characteristics of the data stream, channel, and line equalizer to find the frequency of maximum sensitivity of the output signal power spectral density, which serves as a reference to establish all feasible loop filter combinations and to define their respective cut‐off frequencies. Based on the proposed methodology, a novel combination for the loop filters (two low‐pass filters) is presented.s