Impact of single pMOSFET dielectric degradation on NAND circuit performance

نویسندگان

  • D. Estrada
  • M. L. Ogas
  • R. G. Southwick
  • P. M. Price
  • R. J. Baker
  • W. B. Knowlton
چکیده

Degradation of CMOS NAND logic circuits resulting from dielectric degradation of a single pMOSFET using constant voltage stress has been examined by means of a switch matrix technique. As a result, the NAND gate rise time increases by greater than 65%, which may lead to timing errors in high frequency digital circuits. In addition, the NAND gate DC switching point voltage shifts by nearly 11% which may be of consequence for analog or mixed signal applications. Experimental results for the degraded pMOSFET reveal a decrease in drive current by approximately 43%. There is also an increase in threshold voltage by 23%, a decrease in source to drain conductance of 30%, and an increase in channel resistance of about 44%. A linear relationship between the degradation of the pMOSFET channel resistance and the increase in NAND gate rise time is demonstrated, thereby providing experimental evidence of the impact of a single degraded pMOSFET on NAND circuit performance.

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عنوان ژورنال:
  • Microelectronics and reliability

دوره 48 3  شماره 

صفحات  -

تاریخ انتشار 2008