Simultaneous DC and TRAN simulations?

Hi there

I was wondering if there would be any ways of doing dc and tran optimizations simultaneously. Briefly speaking, I can get dc to perform optimization on W and L of my gate's transistors to have it run properly according my required area and noise characteristics but at the same time I want HSPICE to do a tran optimization on power and wave shape. I want the resulting W L to be optimizaed for both analysises but it sounds impossible at least with out interference of scripting in MATLAB ot tcl.

Other words, I wanted this obviously wrong code to work:

.dc ... sweep optimize=opt1 results=comp1,ar,tot_power model=optmod
.meas dc comp1 find ...
.meas dc ar min par('area') ...
.meas tran tot_power avg power goal=1p

If I add a tran optimization, it will do another optimization independently but I want dc and tran to be done at the same time.
Thanks

It's been a long time since I've done SPICE, but doesn't a Transient simulation do a DC analysis to generate the initial conditions in the circuit?

enjunear said:

It's been a long time since I've done SPICE, but doesn't a Transient simulation do a DC analysis to generate the initial conditions in the circuit?

Click to expand...

Thanks for your reply.

Yes, I suppose so. but I have nothing to do with initialization. I am stuck with doing a simultaneous dc&tran optimization.

Thanks anyway.

Of course, a TRAN analysis is NOT identical to a DC analysis. The DC analysis consists of a continuous variation of a DC source (or a component value). In this analysis all capacitors (inductors) are assumed to be an open (short) circuit.
In TRAN analyses a time-varying source is applied and all voltages and currents are computed as a function of time (TRAN: calculation of all transients over time)