omsi said:How can we know that the charge formed on metal is positive or negative?
Omsi
protonixs said:NAC/tie down/vt-shift diodes are different from antenna diodes .
analayout said:Hi,
if we put p+ then it is same as the gate is connected to substrate.
Regards,
Analayout.
Doesn't create a good diode, anyway ;-)analayout said:hi,
if its n+ diode in Nwell then its not allowed.
Only so protection diodes make sense!analayout said:so my point is the diode should be reverse biased.
Why should it? At pMOS gates I've often used p+nwell diodesanalayout said:its better to put in substate than in nwell.
because this will cause well antenna error.
The antenna effect generates stress-induced leakage currents that can lead to either immediate or delayed failure of the ovestressed dielectrics. The plasma itself contains an equal number of positive and negative particles.
can you plz explain a bit...???
If doide breaks down then the doide distroys and make path between gate singanl and grnd rite..??
or it is operated in reverse direction (e.g. an n+p substrate diode discharging positively charged plasma ions)..
... when the positive charge bulid up the voltage at n+ is positive voltage and the p sub is at 0 volt so how can it discharge the positive charge to ground(diode is revers biased) ??
... or it is operated in reverse direction (e.g. an n+p substrate diode discharging positively charged plasma ions). In this latter case, such an antenna diode has a breakdown voltage of only a few volts, and the breakdown power is low enough to not destroy the diode.
n+p substrate diodes are used to protect NMOS gates, p+n well diodes to protect PMOS gates.
Not at all.This is technology dependant right?.
Possible, but IMHO impractical: it's much simpler to add one more (min. area) p+ diffusion (the antenna diode) next to the p+ source diffusion of the pMOS, and connect it to its gate. --> Shorter connection to the gate to be protected.Few Technology might have n+p for both pMOS and nMOS protection.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?