Hi all,
I would ask you a help regarding a simple SC circuit. Attached you can find the circuit.
Target of my simulation is to find the Input Referred Noise in [0:Fs/2] at the first input
Sv_in_TOT of the KTC and OPAMP contributions, using the PSS and the PNOISE (bottom picture).
I'm able to compute the
OUTPUT referred noise at the output of the OPAMP with the timedomain option, but the problem is that with this option spectre doesn't compute the
INPUT Referred Noise.
Why with timedomain option is not possible to see the input referred noise but only the output referred noise density?
I've read the paper of Ken Kundert about to compute the noise in SC filters and he advices to substitute the sampling process done by:
- timedomain option
- number of points = 1
- add specific point = 0
with the ideal S/H and using the psnoise standard (no timedomain).
But if I use this method, how can I remove the sinc(x) shaping done by the S/H to the spectral noise density?
Do you have any other solutions?
Thanks in advance, if you can find a minute for helping me,
I'm looking forward to hearing you,
Have a nice day at all,
Rino