Hello,
I have a switched cap gain stage which has 1/f noise and dc offset cancellation circuit, it is driven by a 2 phase non overlap clock.
When I run pnoise analysis on it, I expect to see equivalent output noise spectrum showing attenuation at low frequencies but I do not ?

My pss and pnoise deck is attached below
Any recommendations would be greatly appreciated
thanks
analog2000


simulatorOptions options reltol=1e-3 vabstol=1e-6 iabstol=1e-12 temp=55.0 \ tnom=27 scalem=1.0 scale=1.0 gmin=1e-12 rforce=1 maxnotes=5 maxwarns=5 \ digits=5 cols=80 pivrel=1e-3 sensfile="../psf/sens.output" \ checklimitdest=psf

pss pss fund=16.384K harms=10 errpreset=conservative tstab=10u + annotate=status

pnoise ( out ) pnoise sweeptype=relative relharmnum=0 + start=0.1 stop=200 dec=20 maxsideband=50 iprobe=V7 + refsideband=0 annotate=status