offset pins of general purpose OPAMP

[root2hell]

the OFFSET pins of OPAMP TL081 are not modeled in pspice library but i want to use them.
can anybody help me in that.

 

[FvM]

What's the unclear point of "not modelled"? What do you want to achieve?

You can e.g. make your own transistor level or behavioral model. It will most likely not represent the device behaviour very well, but at least model the offset pins.

 

[D.A.(Tony)Stewart]

OFFSET ADJUST pins are not modeled by any company (AFAIK) unless they are high performance parts due to model complexity.

 

[Audioguru]

Maybe your simulation program assumes that there is no input offset voltage (that occurs only in a real circuit).

 

[FvM]

Maybe your simulation program assumes that there is no input offset voltage (that occurs only in a real circuit).

It depends on the models. Some implement an arbitrary offset voltage as "reality" factor, others are ideal in this regard.

In any case it's really easy in a simulation to add a variable offset respectively offset adjustment voltage to the circuit. In so far I don't yet understand the problem behind the question.

 

[D.A.(Tony)Stewart]

I looked at a bunch of PSpice models formOA's with offset adjust pins and found none in the model. Then I read on one site they are never supplied unless a high precision chip.

You can however , model an input offset.

**broken link removed**

 

[root2hell]

i don't know how to make own transistor level or behavioral model.