[SOLVED] Spectrum cadence for ADC SNDR measurement issues

[yugi_nhc]

Hi, I am trying to use spectrum in Cadence Virtuoso to measure ADC ENOB and SINAD of output signal.
However it always shows the red line
" The signal x-axis vector values are not uniformely distributed. Data was interpolated, which would create numerical noise and differences.
To remove these errors, use uniform raw data".
And the ENOB, SINAD results are totally wrong.
Even I tried with sine wave, the error like that always happen.
Could you please tell me
How can I fix this? How can I use uniform raw data points?
I found one person also had this problem, but no solution has found...

https://www.edaboard.com/threads/how-to-simulate-sndr-in-cadence-virtuoso.381096/

Thank you so much.

 

[sutapanaki]

use strobeperiod in Spectre transient simulation to sample uniformly. Make sure your total FFT sample points span integer number of periods. The number of periods and the number of sample points better be prime numbers.

 

[yugi_nhc]

use strobeperiod in Spectre transient simulation to sample uniformly. Make sure your total FFT sample points span integer number of periods. The number of periods and the number of sample points better be prime numbers.

Thank you so much, it worked