Thanks Ken and Frank for the replies. As Ken mentioned:
Quote:The interpretation of sampled PXF is that of traditional PXF applied to your original circuit with a sampler added to it. And it is not an ideal sampler. It is a sampler that uses the time points of the underlying PSS analysis, that is why the transfer functions tend to droop with frequency.
I'd like to confirm my understanding here. Conceptually, the signal at the output of this added sampler is still considered a continuous-time signal (that is,
vout(t)), not a discrete-time signal (i.e.
vout[n]) as I originally thought. I understand that as a numerical tool, the simulator still needs to look at the continuous-time signal at specific time points for the purpose of computation, but that is an implementation issue; the signal itself is still a continuous-time signal. Is this correct?
Also, if this added sampler is not an ideal sampler, what kind of sampler is it, and how will it shape the output signal spectrum? Will it introduce any sinc-like characteristics at all? If drooping the only effect, how much drooping should I expect?