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Design >> Analog Design >> Question about "Simulating Switched-Capacitor Filters with SpectreRF" by Ken
https://designers-guide.org/forum/YaBB.pl?num=1669622793

Message started by Chien TA on Nov 28^th, 2022, 12:06am

Title: Question about "Simulating Switched-Capacitor Filters with SpectreRF" by Ken
Post by Chien TA on Nov 28^th, 2022, 12:06am

Has anyone had difficulties reproduce Table 2 in the article? The total noise results from my simulation are significantly lower than the results in the paper. I simply execute "spectre -E tah.ckt" from a command prompt. From the pnoise result, I calculated integrated noise power from 0 to 4MHz then I took square root of the result to get the total noise.

What settings can affect my result this much?

maxsideband maxacfreq Ken's total noise My total noise
5 6 MHz 9.28 uV 10.35 uV
10 8 MHz 12.44 uV 12.15 uV
20 12 MHz 15.49 uV 14.09 uV
50 24 MHz 18.14 uV 14.14 uV
100 44 MHz 19.36 uV 14.17 uV
200 84 MHz 20.13 uV 14.16 uV
500 204 MHz 20.51 uV 14.19 uV
1000 404 MHz 20.48 uV 14.18 uV

Thanks,