Help with variable parameters in a HSPICE simulation

[Geoar]

Hello,
I'm new to HSPICE and to the forum as well...

I need to simulate a CMOS inverter varying just the width W of both transistors for 3 cases... Then I need to plot the transfer characteristics (Vin VS Vout) of the inverter.

Is there a way to vary just the two parameters for the three cases in the same program? I think I need to use .param. Can someone explain how I vary the two parameters for each case?

Is there a way to plot Vin VS Vout for the three cases in just one plot? Thanks a lot

.temp 70
.option post
.include 'models.sp'

*------------------------------------------------
* Simulation netlist
*------------------------------------------------

Vin A gnd DC 0 1 .01
Vdd D gnd 1
M1 Y A gnd gnd CMOSN W=360n L=180n
M2 Y A D D CMOSP W=720n L=180n

.plot V(A) V(Y)
.end

 

[apmrao]

In the schematic or netlist make the width as variable by giving some name say WM1 & WM2 and then vary these as per your requirement. You will be able to get the results in a single plot.

 

[erikl]

Try this (can't try it myself right now):

Vdd  D gnd  1
M1 Y A gnd gnd CMOSN W='width'   L=180n
M2 Y A  D   D  CMOSP W='2*width' L=180n
.DC Vin A gnd 0 1 0.1 SWEEP width POI 3 360n 720n 1080n
.plot V(A) V(Y)
.end

Good luck!