An Adaptive PAM-4 Analog Equalizer with Boosting-State Detection in the Time Domain
Document Type
Article
Publication Date
1-1-2017
Publication Title
IEEE Transactions on Very Large Scale Integration (VLSI) Systems
Volume
25
Issue
10
First page number:
2907
Last page number:
2916
Abstract
This paper introduces an improved adaptive analog equalizer that is required in high speed serial receivers using four-level pulse amplitude modulation signaling. By performing boosting-state detection in the time domain, the proposed adaptive analog equalizer can effectively overcome a serious problem that the received signal's eye-opening tends to be compromised by the convergence accuracy of the adaptive control loop. To suppress the pattern-dependent jitters (PDJs), an inductor-less, cross-stage feedback structure is employed in the proposed analog equalizer to help broaden its effective tuning bandwidth. Multichannel simulations have confirmed that the proposed equalizer is able to achieve a 42% improvement in eye-height opening when compared with the equalizers employing popular spectrum-comparing schemes. Trellis diagram analyses under different date rates have revealed that the bandwidth of the proposed equalizer can be extended by as much as 60%, thus effectively bringing the PDJs from 44% down to 27.5%. © 2017 IEEE.
Language
english
Repository Citation
Li, S.,
Jiang, Y.,
Liu, P.
(2017).
An Adaptive PAM-4 Analog Equalizer with Boosting-State Detection in the Time Domain.
IEEE Transactions on Very Large Scale Integration (VLSI) Systems, 25(10),
2907-2916.
http://dx.doi.org/10.1109/TVLSI.2017.2720750