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    Single Event Mechanisms in 90 nm Triple-well CMOS Devices

    Roy, Tania
    : https://etd.library.vanderbilt.edu/etd-07252008-100559
    http://hdl.handle.net/1803/13567
    : 2008-07-28

    Abstract

    Triple-well NMOSFETs collect more charge as compared to dual-well NMOSFETs. Single event charge collection mechanisms in 90 nm triple-well NMOS devices are explained and compared with those of dual-well devices. The primary factors affecting the single event pulse width in triple-well NMOSFETs are the separation of deposited charge due to the n-well, potential rise in the p-well followed by the injection of electrons into the p-well by the source, and removal of holes by the p-well contact. Design parameters of p-wells, such as contact area, doping depth and placement, are varied to reduce single event pulse widths. Pulse width decreases as the area of the p-well contacts increases, the p-well contacts becomes deeper, and the p-well contacts are placed more frequently. Increasing the p-well – n-well junction depth also causes the full width half rail (FWHR) pulse width to decrease. In long p-wells with multiple transistors present in them, a potential gradient occurs along the body of the well as regions of the well away from the strike remain unaffected.
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