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# HSpice simulation for getting the vref variation

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#### jc2

##### Member level 3
**********FIRST SIMULATION********
.temp 27
.dc temp -25 125 1
.print vref
*******************************

********SECOND SIMULATION********
.dc temp -25 125 1
.print vref
********************************

The vref variation in the first simulation is very diferent to the vref variation in the second simulation.

Why does HSpice get diferent results between the two simulations?.

Which is the correct simulation for getting the vref variation?

What is the function of .temp?

thanks

hspice .temp

There should not be aby difference in the two simulations.If you do not define .temp 27 , then Hspice should take the default value.In the .DC simulation, the OP would be done for each value of the DC step.Any comments?

### jc2

Points: 2
spice simulation .temp

Hi
maybe it relates to tref or tnom options.
see hspice user manual.
regards

### jc2

Points: 2
hspice temp

**********FIRST SIMULATION********
.temp 27
.dc temp -25 125 1
.print vref
*******************************

********SECOND SIMULATION********
.dc temp -25 125 1
.print vref
********************************

The vref variation in the first simulation is very diferent to the vref variation in the second simulation.

Why does HSpice get diferent results between the two simulations?.

Which is the correct simulation for getting the vref variation?

What is the function of .temp?

thanks

I agree with dhasmana, there should not be any difference.

If I write in the simulation script .temp -25 or .temp 125, HSpice shows the same vref variation of the simulation with .temp 27(FIST SIMULATION).

What do I have to do?

thanks

hspice change temp

try using

.param temp = 27
.dc temp -25 125 1

.temp in hspice

.temp defines the operating temperature of your circuit. There is no correct result, it all depends on your application.

In your case however, it is interesting point. Did you see the manual, what did it say?

I think it is not the .temp which is problematic. The .DC command should be looked at, may be the temperature should not be defined this way.

Cheers

Re: .temp HSpice

**********FIRST SIMULATION********
.temp 27
.dc temp -25 125 1
.print vref
*******************************

********SECOND SIMULATION********
.dc temp -25 125 1
.print vref
********************************

The vref variation in the first simulation is very diferent to the vref variation in the second simulation.

Why does HSpice get diferent results between the two simulations?.

Which is the correct simulation for getting the vref variation?

What is the function of .temp?

thanks

I don't know what the problem is. Maybe, it's not possible to use .temp and .dc temp together.

thanks

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