Adaptive Interference Mitigation for Multilevel Flash Memory Devices

Myeongwoon JEON  Kyungchul KIM  Sungkyu CHUNG  Seungjae CHUNG  Beomju SHIN  Jungwoo LEE  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E94-A   No.11   pp.2453-2457
Publication Date: 2011/11/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E94.A.2453
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Analog Signal Processing
Keyword: 
flash memory,  interference cancellation,  interference mitigation,  error correction,  

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Summary: 
NAND multilevel cell flash memory devices are gaining popularity because they can increase the memory capacity by storing two or more bits to a single cell. However, when the number of levels of a cell increases, the inter-cell interference which shifts threshold voltage becomes more critical. There are two approaches to alleviate the errors caused by the voltage shift. One is the error correcting codes, and the other is the signal processing methods. In this paper, we focus on signal processing methods to reduce the inter-cell interference which causes the voltage shift, and propose two algorithms which reduce the voltage shift effects by adjusting read voltages. The simulation results show that the proposed algorithms are effective for interference mitigation.