Hi,

In Fig 17 of the paper: "Device noise simulation of DS Modulators", simulation results of the input referred noise PSD of a discrete-time integrator is plotted. The plot shows that at relatively high frequencies (close to fs/2), the noise floor starts to rise significantly. In the paper, it is mentioned that this is due to the small integrator gain near fs/2. However, this is not clear to me. The reason is I think the integrator gain should only affect the output noise spectrum, not the input-referred spectrum. (The input-referred spectrum should not depend on the transfer function H(z).)
On the other hand, I thought the input PSD should be white at medium to high frequencies.

Any feedback or comments are very much appreciated.

Thank you,

Alireza

On page 14 of the paper, it says Figs 15-17 are plotted up to the frequency fs/2=62.5KHz. However, the plots extend over 1MHz freq. range. Why is that?

What I am looking for is whether pnoise (time-domain) or pnoise (sources) were used to obtain the plots in Figs 15-17.

Regards.