i was told that this is due to the high gain (mine is 90dB) of the Opamp, and the transient step in cadence is not small enough to resolve it. I previously had similar situation with an a very high gain opamp when i sim it in transient (open loop, standalone, so i finally had to sim it in close loop to fix the issue), and got a similar explanation for that. But in my current case, i just don't understand
why increase the simulation time would fix the probelm. the two attachment are the simulation record correspondnig to 50u and 500u, and i highlight the crucial data inside, can you intepret why longer simulation time will solve the issue?