ADA8282 SPICE model failure

Hello mohammadsdtmnd,

I have simulated ADA8282 using LTspice and the provided Spice model. I don't see any issues, as shown below:

I followed this procedure to create the symbol within LTspice:

https://www.analog.com/en/technical-articles/ltspice-simple-steps-to-import-third-party-models.html

I also made sure I have a path to ground from each input (E1, and V1).

Here is the simulation file and the symbol file *.asy, for your review:

7725.ADA8282 Ezone question 5_13_19.zip

Please review and let me know.

Regards,

Hooman

I followed this procedure to create the symbol within LTspice:

https://www.analog.com/en/technical-articles/ltspice-simple-steps-to-import-third-party-models.html

I also made sure I have a path to ground from each input (E1, and V1).

Here is the simulation file and the symbol file *.asy, for your review:

7725.ADA8282 Ezone question 5_13_19.zip

Please review and let me know.

Regards,

Hooman

Thank so much, have you tested it for long time, will it stay stable for 1 secound?

Look, in first one millisecond I have what you've achieved, but it deviate as the time passes:

Thanks for your sharing of model, as I think our models are the same except for it's model pin arrangement, I didn't upload it but only check on your model for long time simulation.

The best requard

Hi mohammadsdtmnd,

Yes, I see the same strange behavior of the model if I let Transient Response run beyond about 45ms. I cannot tell what's causing the ADA8282 model to misbehave like that!

The Spice model file does hint that the model may be very minimal, copied below:

"*This model was created for the purposes of simulating functionality only.
*Parameters modeled include:
* Output Voltage Swing
* Bandwidth
* Functionality at 36dB gain
* Supply current"

I think in normal applications dealing with typical signal frequencies / periods, that's a probably a "don't care".

Is there a particular reason that you need to let your simulation run that long?

Regards,

Hooman

Hi Hooman!

regards!

Hi mohammadsdtmnd,

I think you are asking about the source E1 in my schematic?

That's just a "voltage dependent voltage source" to help me create the differential input by specifying its gain to be "-1V/V" so that it'd be inverted compared to the other source V1.

I'll forward the question about the misbehavior of ADA8282 pspice time-domain transient response issue going past 45ms to people in charge and if I get a resolution I'll post it here.

Regards,

Hooman

Hi Hooman, thank you so much.

best regard.