I drew 2 different test circuits on AD8671 in LT Spice and try to perform a transient analysis on the chip . When I ran the two test circuits individually, both of them behave well. But If I include both of them in the same schematic, the simulation always get stuck in the very beginning.
The first picture is the test circuit I drew according to Fig 35 in the chip manual and the simulation looks good (shown in the second picture)
The third picture is the 2nd test circuit I drew. It is simple inverted amplifier. The simulation results also look fine (shown in the fourth picture)
BUT if I include both them in the same window as shown in picture 5, the simulation get stuck in pico-second region...... shown in the last picture
I don't know if I am doing something wrong with the LT Spice or there is some intrinsic problem of the schematic when the two circuits are put together ? The original ".asc" file is attached in the zipped file below.
try to add this statement on your schematic ".options cshunt=1e-15"
Can you attach your actual LTspice schematic file ".asc" extension?
Did that statement work?I was also facing same problem.And still not able to find the solution of it.I tried it and it didn't work.If it did pls tell me mybkexperience
The statement solves the converging issue of LuMA's schematic. Can you attach your LTspice schematic having a convergence problem?