When I simulated the same two-stage op amp circuit in spectre many times, spectre gave different dc operating point simulation results (the following three pictures are the dc operating point simulation results of the same circuit, each time M6 and M7Ids are different).
The last two simulation results do not satisfy KCL (the id of M6 and M7 are not equal).Are these phenomena caused by errors in the simulator itself? Or are there other reasons?Is there any way to avoid simulation results that do not meet KCL? Thank you very much.