Products Mentioned

AD8047 Production
The AD8047 and AD8048 are very high speed and wide bandwidth amplifiers. The AD8047 is unity gain stable. The AD8048 is stable at gains of two or greater...
Datasheet
AD8047 on Analog.com

Simulation doesn't advance after changing opamp

Pavel47

on Sep 29, 2022

Category: Software

Hello,

In this setup when I change U5 for AD8047, simulation starts, advance a little bit, then due do convergence problems advance extremely slowly.

Any suggestions ?

Thanks.

0 Pavel47
on Sep 29, 2022 8:39 AM
Similar setup, where I changed once more opamps.

Simulation runs until the end ... but can I trust the results (e.g. out6 goes up to 14) ?

Thanks.
Cancel
Up 0 Down

Reply

Verify Answer

Cancel
0 John Kevin

on Sep 30, 2022 1:50 AM in reply to Pavel47
Hi Pavel47,

Thank you very much for your participation in this community by reporting a possible issue in one of our device models.
I will reach out to the ADI experts on this device to review the application circuit design and the LTspice model.

Can you please upload your simulation files? Thanks again.
Cancel
Up 0 Down

Reply

Verify Answer

Cancel
0 Pavel47
on Sep 30, 2022 4:16 AM in reply to John Kevin
Hi John,

Here it is

analog_new_concept5.asc
Cancel
Up 0 Down

Reply

Verify Answer

Cancel
0 Pavel47
on Oct 4, 2022 4:08 AM in reply to Pavel47
Hi John,

Could you reproduce the case.

Sincerely
Cancel
Up 0 Down

Reply

Verify Answer

Cancel
0 John Kevin

on Oct 17, 2022 2:58 AM in reply to Pavel47
Hi Pavel47,

There simulation time of this circuit takes around 200seconds. SPICE Error Log contains a long list of instances of convergence problems.

By changing the last op-amp stage with the AD8040 instead of the AD8047(and connecting R6 to out 5) the simulation is much faster (12 seconds only).
Cancel
Up 0 Down

Reply

Verify Answer

Cancel

Partner Forums

Partner Libraries

Products Mentioned

Simulation doesn't advance after changing opamp