Threshold voltage bitmap analysis methodology: Application to a 512kB 40nm Flash memory test chip
Résumé
The reliability requirements of Flash memory become more and more challenging. Flash memory technology development needs test chips to allow large statistical studies and a product-like approach. In this paper, we present a methodology of bitmap analysis to extract and follow the intrinsic and extrinsic parameters of a 40nm eFlash technology during ramp-up. This methodology is, first, based on analog bitmap acquisition on 512kB test chip, followed by correction of spatial variabilities like peripheral circuits' influences, array organization impacts and process-induced effects, to extract supplementary cell electrical parameters such as threshold voltage, transconductance or programing window. Finally, such an analysis tool enhances the advantageous properties of a test chip, its large memory cell statistics and its product-like organization, to give more reliable data. It yields more information about intrinsic cell technology weaknesses and the best way to tackle them when integrated at product level.
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