J
Jan Mikkelsen
Guest
Hi
I am having a problem with the PSS/PNOISE simulations in Spectre. I have
a sampling mixer followed by a series of Switched-Capacitor sections.
The SC sections use :8/:4/:4 down sampling rations as the signal passes
through the chain.
For the PSS simulation I have the beat frequency set to the LO frequency
divided by 8*4*4 = 128. The LO is at 2GHz.
When I simulate the noise I would expect to see "traces" of the
frequency response, but the noise curve produced shows a nice flicker
noise term and then a thermal term ... this is to say that the noise
curve is nice and smooth and shows no signs of any filtering.
Question: Am I just stupid for expecting to see effects of the filtering
in the noise simulations? Or have I done something wrong in setting up
the simulation?
Regards,
Jan Mikkelsen
I am having a problem with the PSS/PNOISE simulations in Spectre. I have
a sampling mixer followed by a series of Switched-Capacitor sections.
The SC sections use :8/:4/:4 down sampling rations as the signal passes
through the chain.
For the PSS simulation I have the beat frequency set to the LO frequency
divided by 8*4*4 = 128. The LO is at 2GHz.
When I simulate the noise I would expect to see "traces" of the
frequency response, but the noise curve produced shows a nice flicker
noise term and then a thermal term ... this is to say that the noise
curve is nice and smooth and shows no signs of any filtering.
Question: Am I just stupid for expecting to see effects of the filtering
in the noise simulations? Or have I done something wrong in setting up
the simulation?
Regards,
Jan Mikkelsen