Virtual ground simulation

[Roff]

This sim works with other op amps I have tried (only 2 or 3 others), but TL072 gets it all wrong, at least using the model that I have.
Has anyone else seen this?

 

[ericgibbs]

This sim works with other op amps I have tried (only 2 or 3 others), but TL072 gets it all wrong, at least using the model that I have.
Has anyone else seen this?

hi Ron,
My model suffix is .301 from YLTS.
I got exactly the same result values as you did.

The only work around I could find, is the 'COM' symbol on the 072 output.

Eric

 

[Roff]

Hi Eric,
SgtWookie on AAC found that TI had used GND (node 0) in their models. He changed them to the vee node, and all was well.
I believe SgtWookie also posts here, but under a different name.

Are you there, Wookie?

 

[QuietMan]

I've had the impression not, but if he does I would be interested in knowing.

 

[Roff]

hi Ron,
My model suffix is .301 from YLTS.
I got exactly the same result values as you did.

The only work around I could find, is the 'COM' symbol on the 072 output.

Eric

What is YLTS?

 

[ericgibbs]

What is YLTS?

hi Ron,

Yahoo User Group for LTspice

**broken link removed**

 

[Roff]

hi Ron,

Yahoo User Group for LTspice

**broken link removed**

Ahhh... I had never heard it called that.

 

[ericgibbs]

Ahhh... I had never heard it called that.

Hi,
Sorry Ron, I guess the txtspeak virus has infected my brain.

Did you get any further with a solution.? I think SgtWookie is aka on ETO as SgtWook

 

[Roff]

Hi,
Sorry Ron, I guess the txtspeak virus has infected my brain.

Did you get any further with a solution.? I think SgtWookie is aka on ETO as SgtWook

[URL="https://forum.allaboutcircuits.com/showpost.php?p=418083&postcount=3"]SgtWookie posted a link[/URL] to a TL07x model that works. He also mentioned some other models with a similar problem, which he solved by changing node 0 to the vee node.