Hi

This is with reference to Ken Kundert's book, The Designer's Guide to Spice and Spectre, Chapter4: Section 4.2.2.1-Stiff circuits under Transient analysis. I am trying to understand  the three numerical methods discussed and recreate the graphs shown on page 136-138. The problem is for trapezoidal method, I am unable to see the ringing shown for higher values of pole frequencies. I have tried with very small time constants and very high time steps(forced cadence to follow the required time step only). I changed the settings to Conservative/Liberal and traponly. When I code the same equation in Matlab, the results come as expected. Has the cadence done some error correction for this, and I should indeed not see the trapezoidal ringing in this case?

I have checked the traponly in transient options. Is there any other setting pertaining to this as well?

If I understand correctly, the simulator uses break-points at every sharp corner of the stimuli. This circuit, however, has no such source. It is a rc circuit, with an initial condition.
The idea actually is to understand in which circuit to expect trapezoidal ringing, and if there are some differences between theory and practice.