AD8031 simple buffer not working

[cforte]

Strange values on output of this simple buffer.

[_user32 · Accepted solution]

cforte,

It does appear that this model for the AD8031 (and the variations for the AD8032) in Multisim v12 has some issues and is incorrect, however, in the updated model version for the AD803X it does look like it has been updated (so in future Multisim updates it should be fixed).

In the mean time, here is an updated version of the AD8031 for you and others:

Regards,

Pat Noonan

NI

[ksielewi]

Hi!

I try to use the AD8032 in Multisim v13 and the output of the amplifier still doesn't seem to work. Can you do something with that?

Regards,

Krzysztof

[Tien_P]

Hi Ksielewi,

Please post the Multisim file, I can have a lot at it.

[Tien_P]

Hi Ksielewi,

Please post the Multisim file, I can have a lot at it.

[ksielewi]

I attach the file.

As you'll see from the simulation the output of AD8031 is high all the time. There must be something wrong with the opamp spice model.

Regards,

Krzysztof

[Tien_P]

Hi  Krzysztof,

It doesn't look like AD8031 model will work with a single rail voltage source.  Try the models mention in the following page:

http://www.analog.com/library/analogdialogue/archives/42-05/clock_buffer.html

Also, you should avoid using zero ohm resistors it can potentially be divided by 0 and it can cause convergence errors.