Hi,

 I tried to make an ideal noise source with a predefined noise spectrum in order to find out how
different injecting nodes give different transfer properties.
Is it possible to make a noise source, say, current source with zero DC current and open impedence?

Ken Kundert wrote on Nov 28^th, 2006, 3:01pm:

Hello Ken,

For XF simulation in ADE, only the output terminal can be set. And after the simulation, only the "port" and "vdc" can be available to plot the transfer function. What if the voltage-controlled voltage source. Can I use the method you mentioned above?

And where I can find information about 'stimuli' setting?

Thanks,
Yutao Liu

rfidea wrote on Nov 18^th, 2012, 6:07am:


Thanks for your reply.
Could you tell me some detail?

Actually, I made a phase domain behavioral model of pll with component in analogLib. I used vccs to model the charge pump, vcvs to model an amplifier. I want to simulate the noise shaping effect for a given noise source, like resistor in the loop filter or charge pump.

Is XF simulation able to get what I want? How to do that?


Thanks,
Yutao Liu

I do not have the Virtuoso environment in front of me but there is parameters in the components options list called noise/frequency pairs. Just fill in what you want.

About resistors, yes, spectre will calculate thermal noise from them. That is the idea with a simulator.