Nonlinearity measurements and write precompensation studies for a PRML recording channel
Nonlinearity measurements and write precompensation studies for a PRML recording channel
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PRML 记录通道的非线性测量和写入预补偿研究
DOI：
10.1109/20.490257
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
X. Che
中科院分区：
文献类型：
--
作者：
X. Che
对非线性测量技术进行了全面的综述。对于每一种技术，假设记录系统只有非线性跃迁和部分擦除，对其精度、灵活性和效率进行了解析研究。为了区分局部擦除和非线性跃迁，提出了一种新的频域方法。将该测试方法应用于写入电流优化、半接触记录和MR回放的研究。最后，在SPINSTAND实验的基础上，给出了非线性测量结果与最优写预补偿水平之间的相关系数。然后利用只包括非线性跃迁的分析模型对该关联因子进行了定量验证。
A general overview of nonlinearity measurement techniques is presented. For each technique, its accuracy, flexibility, and efficiency are studied analytically, assuming a recording system having only nonlinear transition shift and partial erasure. To distinguish partial erasure from nonlinear transition shift, a new frequency domain method is proposed. The test method was applied to study write current optimization, semi-contact recording and MR playback. Finally, a correlation factor, that relates the nonlinear measurement result to the optimal write precompensation level, is given based upon spinstand experiments. This correlation factor is then verified quantitatively utilizing an analytical model which includes only nonlinear transition shift.