Forums » CircuitLab Support Forum

I have this problem usually when there are Op-amps in play. I run a DC analysis and can sometimes get wrong or just plain bizarre results, but when I run a simple DC Sweep I get different and much more believable results. What gives?

@joeyglloyd,

Can you post an example?

There is a difference between CLs rail opamps and their rail-less models. The answers may be different using these two models in your two cases.

You might be interested in this thread:

https://www.circuitlab.com/forums/support/topic/p28xfm83/incorrect-simulation-of-an-opamp-under-positive-feedback/

Here is my misbehaving circuit:

https://www.circuitlab.com/circuit/vhcz88/bad-dc-simulation/