vp1953
|
Hi Newic,
It probably does not hurt to have a double guard ring around the pre-driver. Aside from latch up prevention, it also helps to keep substrate currents confined to the local area, a factor that is of importance if the IO driver is sourcing large currents. 1.5mA does not seem like a huge current but if there are VCO's, bias generators etc in close proximity, having a double guard ring around the predriver would be helpful.
|