I have a CMOS inverter that I've extracted to a dspf file using Calibre xACT.
When I save any of the terminal currents of the extracted block in a harmonic balance simulation, the circuit ceases to oscillate and the output is just a dc signal.
Does anyone know why this happens? The simulation completes without error and it was just luck that I noticed this was the cause. I've tried it with transient and dc simulations but they run fine.
I'm using Cadence ICADVM18.1-64b.83.