In latch-up condition, parasitic component gives rise to __________ conducting path
In latch-up condition, parasitic component gives rise to low resistance conducting path between Vdd and Vss with disastrous results. Carefull control during fabrication is necessary to avoid this problem.
Latch-up can be induced by
Latch-up can be induced by glitches on the supply rail or by incident radiation.
How many transistors might bring up latch up effect in p-well structure?
Two transistors and two resistances might bring up the latch-up effect in p-well structure. These are associated with p-well and with regions of the substrate.
Substrate doping level should be decreased to avoid the latch-up effect.
An increase in substrate doping level with a consequent drop in the value of Rs can be used as a remedy for latch-up problem.
What can be introduced to reduce the latch-up effect?
The introduction of guard rings can reduce the effect of latch-up problem. Guard rings are diffusions which decouple the parasitic bipolar transistors.
Which process produces circuit which are less prone to latch-up effect?
BiCMOS process produces circuits which are less likely to suffer from latch-up problems where as CMOS circuits are very highly prone to latch-up problems.
One of the factor in reducing the latch-up effect is
One of the main factor in reducing the latch-up effect is reduced n-well resistance Rw. Reduction in Rw means that a larger lateral current is necessary to invite latch-up and higher value of holding current is also required.
The parasitic pnp transistor has the effect of _______ carrier lifetime
The parasitic pnp transistor has the effect of reducing carrier lifetime in the n-base region.
The reduction in carrier lifetime brings about
The parasitic pnp transistor has the effect of reducing carrier lifetime in the n-base region which results in radiation in beta.
Latch-up is the generation of
Latch-up is the generation of low-impedance path in CMOS chips between the power suppply and ground rails.