different power supply for analog and digital part

[varunmjman]

mised

Hi all...

I need a small help...
I am kind of using the circuit i have attached. I need to use separate power supplies for digital, vdd! and gnd!, and for analog, vdda! and gnda!. But i am getting the results all wrong. But if i use the same ground,gnd!, the circuit works normally. I checked the netlist and found that the gnd! is taken as node '0'. Thats why my result is all going wrong.

So how can i use different power supply for my analog and digital part and proceed all the way to the layout....[/img]

 

[erikl]

Mised signal doubt....

Insert a vdc source between gnda! and 0 (or gnd!) with vdc=0