Simulation only working with LTSpice v17.0.37.0

Hi bonelli ,

I need your custom symbols and subcircuits. Zip everything up and drag to reply window.

mike

vca810 - filter.zip

Hello,

.asc, .lib and .asy attached in the zip file.

Thank you

Hi bonelli ,

That is interesting. Fails to find DC operating point in v17.1 and 24.0.12, but it does run in the latest 24.1 Beta and in XVII. I don't see your stepped data, though. It is possible there are settings to get it to run in 24.0, but would take some time to track down, and 24.0 will be old news, soon. if you want to try the beta version (it's very stable), check it out here (it installs the latest 24.0 and 24.1):

 (Missing Wiki Page) 

mike

I've just installed the 24.1 Beta. Simulation ended without error. But the simulation results are absolutely wrong ! The voltage controlled amplifier seems to work has a simple comparator.

Greetings,

Have you found a solution to this issue?

I'm experiencing similar problems while simulating the VCA810. The simulation only runs correctly when the output is left open. As soon as I connect a load, the simulation freezes on version 17 and automatically stops on version 24 (it says that iteration limit has been reached) 

When using an open output, the simulation runs on version 17, but the results are completely incorrect in version 24.

Any insights or solutions would be greatly appreciated!

Lucas 

Hi bonelli ,

Ah, some more data points. In 24.1.5. I can run the simulation for -2V, -0.5V, and 0V for second VCA810, it appears to work, though I'm guessing the results are not what you expect. Other control voltages fail. I can only recommend building up the filter with similar ADI components to get a baseline, then replace the ADI op amps with the VCA810 one at a time. Sorry, can't be of more help.

I'm guessing is a problem with the VCA810 model. Hard to debug a third party model, unfortunately. 

mike