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AGC problem on LTspice with AD8330 and LTC5507

Question asked by Dario90 on Jan 8, 2018
Latest reply on Jan 8, 2018 by Bruce_H

I'm trying to simulate an AGC circuit employing AD8330 as VGA, LTC5507 as power detector and AD8601 as a general OPA in the feedback loop, as in the attached schematic. I'm finding the same simulation problem that I had when I was testing the AD8330 VGA alone: "Analysis: time step too small; trouble with node u1:gainlo". With only AD8330 I added the spice directive ".options cshunt=1e-15" but it seems no more enough.

 

Could someone help me? 

 

Thank you very much

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