Latchup in CMOS Technology

Latchup in CMOS Technology

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Why a book on Iatchup? Latchup has been, and continues to be, a potentially serious CMOS reliability concern. This concern is becoming more widespread with the ascendency of CMOS as the dominant VLSI technology, particularly as parasitic bipolar characteristics continue to improve at ever smaller dimensions on silicon wafers with ever lower defect densities. Although many successful parts have been marketed, latchup solutions have often been ad hoc. Although latchup avoidance techniques have been previously itemized, there has been little quantitative evaluation of prior latchup fixes. What is needed is a more general, more systematic treatment of the latchup problem. Because of the wide variety of CMOS technologies and the long term interest in latchup, some overall guiding principles are needed. Appreciating the variety of possible triggering mechanisms is key to a real understanding of latchup. This work reviews the origin of each and its effect on the parasitic structure. Each triggering mechanism is classified according to a new taxonomy.He demonstrated both theoretically and experimentally (using a combination of an NPN and a PNP transistor) that the latter configuration could be used to reduce the gain and make it more uniform as emitter current varied. ... 4.1.2 Semiconductor Contro//ed Rectifier (SCR) The next modeling effort for the PNPN structure occurred during the development of the semiconductor controlled rectifier (SCR), anbsp;...

Title:Latchup in CMOS Technology
Author:R.R. Troutman
Publisher:Springer Science & Business Media - 2013-03-14


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