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Simulators >> RF Simulators >> Pnoise sims. for CDS SC integrator
https://designers-guide.org/forum/YaBB.pl?num=1268390275

Message started by mvaibhav on Mar 12^th, 2010, 2:37am

Title: Pnoise sims. for CDS SC integrator
Post by mvaibhav on Mar 12^th, 2010, 2:37am

Hi,

I'm trying to simulate a SC integrator with correlated double sampling technique using Cadence SpectreRF. I used pss-pnoise simulations but I don't see any noise shaping from 0-fs/2 in the autozeroing phase as I would expect due to the PSD shaping function of CDS -- 2(1-cos2pifT). I tried both "sources" and "tdomain" pnoise.

Thanks.

Title: Re: Pnoise sims. for CDS SC integrator
Post by mvaibhav on Mar 12^th, 2010, 3:31am

Analysis statements:

simulatorOptions options reltol=1e-3 vabstol=1e-6 iabstol=1e-12 temp=27 \
tnom=25 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=100M harms=100 errpreset=moderate saveinit=yes
+ writefinal="final.ic" swapfile="swap" method=gear2only
+ annotate=status
pnoise ( net0140 net0112 ) pnoise start=1 stop=50M dec=10
+ maxsideband=100 annotate=status

Signal sources (only clocks active):
V14 (phi2 0) vsource type=pulse val0=0 val1=1.5 period=10.0n delay=0 \
rise=150.00p fall=150.00p width=4.0n
V15 (phi1 0) vsource type=pulse val0=0 val1=1.4 period=10.0n delay=4.9n \
rise=150.00p fall=150.00p width=4.5n