Guys
I'm doing hyperlynx power integrity analysis on a Stratix 4 0v9 power plane. It is showing a 30mV voltage drop across the BGA itself, let alone getting the power to the BGA which is dropping another 50mV.
Surely the 30mV cannot be true as there is a power plane in the BGA package itself.
Historically I would look at the size of the plane and assume that everything is fine and I can't help wondering whether this worst case analysis is a bit pointless.
Any opinions?
BTW I'm already just beyond the PCB thickness I'm allowed so I can't just use thicker copper.
Colin
PS. sorry about using Google, I'm sitting in the UK behind a firewall controlled by an Indian call centre.