In pad rings, it has vdd, gnd..etc. I would like to have separate vdd for digital and analog. Let's say I am sharing ground.
How should I use "power cut" cell from foundary to separate power ring.
After I use this "cut", then original vdd (say, for digital) won't make a circle any longer?
I am wondering what does look like for my pad/pad ring after power cut is used.
What you say is correct. If you use power cut cell, usually the VDD are connected by several reverse biased diode. You do this to help ESD of the analog pad.
Another way is to physically separate the pads. In this way, the gnd and vdd are cut.
You need to use the correct pad types in different style. Refer to the analog pad application for instruction.
I'm quite confused with so much sepetated supply rails,pad ring,esd rail,power cut....
can anyone give a figure as example...
THX
Added after 1 minutes:
hi,I'm quite confused with so much seperated supply rails,esd rail,pad ring,power cut... stuffs,can anyone give a figure to illustrate them clearly?
THX!!