Spice code for IC741 OpAmp

[srivatsan]

pspice code for an opamp

I am trying to implement (transistor-level and NOT macromodel) the op-amp LM741 on spice for analysis. but it is not working. Has anyone tried similarly before?

 

[srik]

spice code for opamp

hi,
look up for the circuit in Gayakwad textbook.
look for the region of operation of all the devices.

BTW, which spice models do you use for the transistors?

 

[srivatsan]

pspice code for opamp

I got the spice code working for the op-amp uA741. Now the interesting thing is: if the level is set to 2, the output is wierd (5mv for open-loop inverting amplifier), but for level = 1 the output is near- prefect. i am still thinking about the reason. how about level = 4. they dont seem to merge well as in MOSFET's model.

if anyone knows the reason, please reply and thank you....

 

[tlihu]

ic 741 op amp

That's because the op-amp circuit is fine-tuned based upon certain model parameter set and different levels specified in SPICE models usually means different model set.