[Moved]: Problem with optimizing delay of inverter in Hspice

hi. I want to Optimize the delay of inverter with sweep wn and wp. this is my code:




but it is not work.
Does anyone know where is my fault?

Re: Problem with optimizing delay of inverter in Hspice

ali206 said:

hi. I want to Optimize the delay of inverter with sweep wn and wp. this is my code:

---

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*** opt inverter ***
.options post=2
.lib 'mm018.l' tt
.temp 27
.param vsup=1.8
.MODEL model1 OPT
.PARAM   wp=OP T1(0.25u,0.25u,9u)
.PARAM   wn=OP T1(0.25u,0.25u,9u)
*****************
VDD vdd GND vsup
VA  IN  GND PULSE   0                vsup           0NS            0NS         0NS             1NS      2NS
*****************
m1  OUT IN  GND GND nch W=wn    L=0.18u
m2  OUT IN  Vdd Vdd pch            W=wp L=0.18u
*****************
.op
.TRAN   0.0000001ns     20ns    SWEEP       OPTIMIZE=OPT1      RESULTS=tpd        MODEL=model1
 
.MEASURE TRAN tplh TRIG V(IN) VAL='vsup/2' FALL=1 TARG V(OUT) VAL='vsup/2' RISE=1
.MEASURE TRAN tphl TRIG V(IN) VAL='vsup/2' RISE=1 TARG V(OUT) VAL='vsup/2' FALL=1
.measure tpd param='(tplh+ tphl)/2'    goal=0
 
.end

---

but it is not work.
Does anyone know where is my fault?

Click to expand...

what is the error ?

Re: Problem with optimizing delay of inverter in Hspice

ali206 said:

VA IN GND PULSE 0 vsup 0NS 0NS 0NS 1NS 2NS

Click to expand...

Not sure if it works with tr=tf=0

ali206 said:

.TRAN 0.0000001ns 20ns SWEEP OPTIMIZE=OPT1 RESULTS=tpd MODEL=model1

Click to expand...

Time resolution of 10^-16s may be way too small, try a greater value!

Also, I'm not sure if your optimization syntax is correct. What's the parameter (or name) OPT1 ?

Here is a documented example of a working optimization: View attachment HSPICE_optimization-example.pdf