Reading from a text file in Spectre

I don't think that syntax is currently supported (you'd have to file an enhancement request for this with customer support).

You could just define your file:

myParams paramset {
idep1val itd1val
100u 100p
200u 200p
// etc
}

and then use:

include "paramset.scs"

in the netlist.

Andrew.

 Thank you very much Andrew. I was away for a couple of weeks.

 I tried the way you suggested. But I couldn't get it work.

 Here is what my file contains:

myParams paramset {
idep1val itd1val
100u 100p
}

I included this file to my stimuli file as:

simulatro lang=spectre

include "(path)/paramset.scs"

simulatro lang=spice

Idep1 vdd idep1  idep1val

Itd1  vdd  itd1     itd1val

but still it complains that "unknown parameter name idep1val"

What am I missing here?

Thanks in advance

Mostafa

Mostafa,

The only point of using a paramset is if you want to sweep - so for example you can use a sweep analysis to vary the parameters over the paramset. But you need a default value defined in a parameters statement:

// parameter set example
parameters p1=1 p2=2 p3=3 p4=4 val1
r1 1 2 resistor r=p1
r2 2 3 resistor r=p2
r3 3 4 resistor r=p3
r4 4 0 resistor r=p4
v1 1 0 vsource dc=1

mydata paramset {
p2 p3
1 2
1 0.5
2 3
}

sweep1 sweep param=p1 start=1 stop=2 step=1 {
  sweep2 sweep paramset=mydata {
      sweep4 sweep param=p4 start=1 stop=5 step=1 {
        dc dc start=0.5 stop=5 step=0.5 param=dc dev=v1
      }
    }
}

 Hopefully that's clearer

 Thank you Andrew,

Your example makes everything clear for me. I guess this approach is not useful for me.

What I'm going to do is,

(1) reading the bias values from a file,

(2) simulating the circuit using those bias values,

(3) computing an error value using the outputs of the circuit,

(4) checking a termination criteria,

(5) writing a new bias set to the file again till my termination criteria is satisfied.

(6) back to (1) 

 I already did that in Hspice, but I can't do that in Spectre. Maybe I'll do the whole thing again in Hspice.

Anyway, thank you very much for your time.

Mostafa

Thank you Andrew,

I give it a try.

I'll be around and ask you more questions soon!

Merry christmas and have a good one.

Mostafa