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Design Languages >> Verilog-AMS >> switch model in DC-sweep analysis
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Message started by spinfab on Jul 19^th, 2013, 6:31am

Title: switch model in DC-sweep analysis
Post by spinfab on Jul 19^th, 2013, 6:31am

Hello,

I wrote a .va model for a switch with a "if then else" approach using $discontinuity(0) and transition(..) commands to improve management of the sharp transition.
For a transient analysis it is functional, but for a DC-sweep analysis ( to plot an I vs V curve), it fails.

Any idea to help me

fab
nb: code skeleton

if (state==0) G=Gmax;
else if (state==1) G=Gmin;
G = transition(G_digital,0,1p);
I(b1) <+ G*V(b1);

Title: Re: switch model in DC-sweep analysis
Post by Ken Kundert on Jul 19^th, 2013, 8:18am

Your code is nonsensical. If you cannot give the original code, at least provide a complete model that actually exhibits the problem.

-Ken

Title: Re: switch model in DC-sweep analysis
Post by spinfab on Jul 22^nd, 2013, 2:04am

Hello,

Finally I succeed by defining a dedicated bloc for DC analysis "analysis('dc')", with the sharp transition transformed in a linear approach.

fab