Well, the reason they set things up to get noise free resistors is so that you can look at the noise contributors from just your circuit elements.

Since you have to live with this stuff in your design in the real world, why would you want to do this in a design?

puzzled in southern california,


Jerry

Yes, I know I can use noise summary but sometimes I feel it would be more convenient to directly plot the noise, especially when I want to check the cyclostationarity of each noise sources. For example, it would be very convenient to do so if I want to find the ISF function for each contributer in an oscillator.

Thanks Sheldon,

Actually that's is exactly what I do currently. but I just want to find out an easy way to get the ISF function in order to
check if my derivation is correct or not since I am developing an analytical solution for oscillators. Rather than inject a
finite width pulse to the osc and measure the phase shift, which is practically difficult to estimate the measurement error,
I try to inject a white noise current to the osc and do the time domain pnoise. This should be much faster and more accurate
than transient approach since the circuit is linearized through PSS solution.


Sincerely,

I know of no way of doing it. I see no point to it. Turning off all the noise sources and then sequentially turning them on one at a time is hard and slow. You get the same information in the noise summary, and you get it from every noise source with one noise analysis.

-Ken