Trying to simulate TL071 with LTSpice

[Grandchuck]

I have been getting reasonable results, except for power.  Is there a model better than TL071.301 that I can download and use?

[Kleinstein]

In many cases one should get away with the AD711 as a replacement for the TL071. It is sopposed to be a slight improvement (e.g. lower R_ou), but still very close. The AD711 model is normally included with LTspice. It is also one of the few models that seems to no have an internal hidden ground.

[Grandchuck]

Thanks Kleinstein.  It behaves better (less quiescent power), but is still a bit higher than expected.  I have attached one circuit that I have been experimenting with.  The results mostly appear to be the same as when using the TL071 model.

Perhaps this is an area where simulations are less realistic?

[MariuszD]

Thanks Kleinstein.  It behaves better (less quiescent power), but is still a bit higher than expected.  I have attached one circuit that I have been experimenting with.  The results mostly appear to be the same as when using the TL071 model.

Perhaps this is an area where simulations are less realistic?

Simulation models always have simplifications. Most often, amplifier models do not replicate the schematic at the transistor level, but instead use ideal controlled sources to simulate basic properties. Such a model may not draw the same current from the power supply as the actual component, and an increase in output load does not necessarily result in increased power supply current. Sometimes the manufacturer writes in the file which properties the model realistically replicates, but most often it is not known.

Usually, in LTspice, I use a universal model and set the parameters that are relevant to the given application.

[macaba]

I use ltspice to get intuition about a circuit, and to increase the chances of it working when built, so exact models aren't really needed.

I use UniversalOpamp2 most of the time now with the parameters pulled from opamp datasheets.

[Grandchuck]

OK, I am now getting a more reasonable simulation using the information found here:

https://www.diyaudio.com/community/threads/tl071-hand-made-simulation-using-discretes.163905/page-2#post-2142379