I am running the circuit below and get the phase noise using pss/pnoise as well as hb/hbnoise. It is a frequency divider(divide-by-two) in which I used sample-and-hold circuits instead of latches to keep it "analog". pss/pnoise gives expected results whereas hb/hbnoise shows zero phase noise at the divided outputs ckI and ckQ. Is the switch not supported by hbnoise or could there be another problem? The log shows the following warning. The frequency in the warning is always the last point I specify for hbnoise.
Warning from spectre at freq = 10 MHz during HBNOISE analysis `hbnoise'.
WARNING (SPECTRE-16518): Arithmetic exception in analysis `hbnoise' .
Schematic snapshot and netlist attached.
Virtuoso IC6.1.7-64b.500.3
Spectre Version 17.1.0.307.isr6 64bit -- 4 Jul 2018
Nagendra
