As mentioned in the question, during the trans simulation, I found that the sum of node currents did not meet the KCL law when checking the trans operating point. I don't know why. Some people say it's parasitic diode current? May I ask how to look parasitic diode current? The pipe in the white box above flows through 5.18u, and the pipe in the white box below flows through 8.63u.
I want to echo what Andrew Beckett said:
t's pretty unusual for Spectre to suffer from gross KCL errors because meeting KCL is one of the convergence criteria. Debugging this via screenshots (which are hard to read) in the forums without any knowledge of the PDK you're using is going to be pretty difficult, so I would strongly advise you contacting customer support (submit a support case after logging in).
If there is a problem with Spectre (unlikely), customer support has direct access to R&D and can resolve your issue. If it's a setup or PDK issue, they can also help. That is the fastest way (and most accurate) to debug and resolve your issue.
Thank you for your suggestion. Seeking the instructor's consent for customer support is a difficult task, and I am ready to overlook the issue with this PDK model.