pnoise timedomain

Hi Svilen,

Pick "Sampled Phase" as follows:

Having set it up with the output node and the points to add etc, hit the Add button. You can add more than one sampled noise analysis this way.

Andrew

Thanks, Andrew, for the prompt reply. Here is an attachment of my setup - hopefully it is correct. One additional question. There used to be an option of also specifying the input voltage source or port to which I could refer the noise. Now I see only an output node. Can I still refer the noise to the input?

Dear Svilen64,

First, I am not Andrew and will not even pretend to provide his insight to your latest question! However, I will add my comments if you bear with my response!

Svilen64 said:

There used to be an option of also specifying the input voltage source or port to which I could refer the noise. Now I see only an output node. Can I still refer the noise to the input?

I believe the sampled jitter capabilities inherently can refer the edge jitter to the input edge - which I think is what you mean. In other words, is it really meaningful to compare the non-sampled noise of the input to the sampled jitter of the output? Hence, in the GUI for noise, set the trigger for the output voltage to a transition of the input. Does this make sense Svilen64 - or did I misunderstand your question?

A full description of the sampled jitter pnoise analysis may be accessed from the Cadence On-line support portal at URL: 

Spectre Circuit Simulator and Accelerated Parallel Simulator RF Analysis in ADE Explorer User Guide -- Single Input Large and Small-signal Analyses - Noise Type=sampled(jitter)

Shawn

Dear Svilen64,

First, I am not Andrew and will not even pretend to provide his insight to your latest question! However, I will add my comments if you bear with my response!

Svilen64 said:

There used to be an option of also specifying the input voltage source or port to which I could refer the noise. Now I see only an output node. Can I still refer the noise to the input?

I believe the sampled jitter capabilities inherently can refer the edge jitter to the input edge - which I think is what you mean. In other words, is it really meaningful to compare the non-sampled noise of the input to the sampled jitter of the output? Hence, in the GUI for noise, set the trigger for the output voltage to a transition of the input. Does this make sense Svilen64 - or did I misunderstand your question?

A full description of the sampled jitter pnoise analysis may be accessed from the Cadence On-line support portal at URL: 

Spectre Circuit Simulator and Accelerated Parallel Simulator RF Analysis in ADE Explorer User Guide -- Single Input Large and Small-signal Analyses - Noise Type=sampled(jitter)

Shawn

Hi Shawn,

Thanks for your input. Yes, I know we are discussing the sampled jitter noise type but actually my initial question was about noise in sampled or switched capacitos setting - for example a sample and hold or SC integrator. So, I don't really need jitter type of a noise but rather just regular noise with all the folding effects because of switching. In this regard if we find the noise at the output of the circuit, we should be also able to refer it to the input. At least this was possible in the old GUI for pnoise 3-4 years back.

Regards
Svilen