Adaptive Decision Point Control and Eye diagram Reconstruction applied to High Speed Wire Communication
Date Issued
2014
Date
2014
Author(s)
Chiu, Shih-Heng
Abstract
In common Clock and Data Recovery circuits, we usually put the decision point(sampling phase and voltage threshold) at the center of Eye diagram when we concern about the jitter. But in real world, the shape of signal would be effected by noise、dispersion and ISI…etc, which makes the Eye diagram not ideal and symmetric, and the decision point is not at the center of Eye diagram anymore.
To reduce the BER, we have to adjust the decision point to ideal place. Therefore, we need a mechanism to adjust the decision point automatically, it can adjust the sampling phase and voltage threshold according to different condition of distortion. We called it “Adaptive Decision Point Control”.
In this thesis, we proposed a theorem based architecture of ADPC applied to high speed wire communication. After get the synchronous amplitude histogram, we can find the ideal sampling phase and voltage threshold by using Nearest Gaussian algorithm, and we can also improve the BER.
In this thesis, we also proposed an architecture of Synchronous Eye diagram Reconstruction. By transfer the histogram of every phase to correspond one dimensional density, we can reconstruct the Eye diagram. The resolution of the Eye diagram is 256(phase)X256(voltage level). The sample number of Eye diagram is 256(phase)X512(sample number of a histogram).
Subjects
時脈和資料回復電路
決策點
適應性決策點控制
同步直方圖
最近高斯演算法
眼圖重建
Type
thesis
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