sigxp & sigwave: PCB SI 610, Cadence SPB 15.2. Originally posted in cdnusers.org by Agathon
1. Why does sigxp ONLY give Reflection measurements if for a PULSE simulation? With custom periodic stim, the measurements are ""NA"" if monotonic test fails. But this doesn't stop Pulse stim. results from reporting everything. Also, there's no apparent specs for ""Pulse"" in the stimulus dialog. Where does the simulator get the duty cycle and freq??
2. Main question: All I did was change from Pulse to custom periodic (without changing freq in the stim dialog). The Settle Delays agree with a manual measurement in sigwave: from buffdly (driver into ref load) to load at vil/vih, but it's the UNLOADED TLINE PROP DELAY!
The Pulse stim gives the apparently correct settle delays. Both have the same toplogy (loaded tline).