An Investigation of External Latchup

A new compact model for external latchup

“…Fig. 8 shows that the collection efficiency is higher for a 90°-oriented detector than for a 0°-oriented detector [9]. This explains why others have observed that the trigger current is lower for a 90°-oriented detector [10].…”

“…In Fig. 6, it is shown that a 4Â increase in W det produces only a 1.2Â increase in collection efficiency [9]. In Fig.…”

“…G det I and G det II are geometric factors that model the effective collection areas; these are functions of detector width and length, W det and L det . Note that W det is set equal to the width of the N-well, rather than the width of the N + diffusion inside the well, because measurement data show that a is a far stronger function of the former dimension [9].…”

“…The latchup trigger current is also an increasing function of temperature [1]. As a result of these two temperature dependencies, external latchup is more strongly temperature accelerated than is standard, internal latchup [9].…”

Analytical modeling of external latchup

“…det I G and det II G are geometric factors that model the effective collection areas; these are functions of detector width and length, W det and L det . Note that W det is set equal to the width of the N-well, rather than the width of the N + diffusion inside the well, because measurement data show that α is a far stronger function of the former dimension [8].…”