A latch-up-like new failure mechanism for high-density CMOS dynamicRAMs |
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Authors: | Furuyama T Ishiuchi H Tanaka H Watanabe Y Kohyama Y Kimura T Muraoka K Sugiura S Natori K |
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Affiliation: | Toshiba Corp., Kawasaki; |
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Abstract: | A latch-up-like failure phenomenon that shows hysteresis in the Vcc-Icc characteristics observed in a high-density CMOS dynamic RAM that utilizes an on-chip substrate-bias generator is discussed. This failure is caused by large substrate-current generation due to the depletion-mode threshold voltage of n-channel transistors at near-zero substrate-bias operation. It is increasingly important not only to design a powerful substrate-bias generator but also to suppress the back-gate bias effect on the n-channel transistor |
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