Can you understand topology of your Loop Filter surely ?
lwzunique wrote on Feb 6th, 2017, 7:01pm:my question here is, what input source should I use? vdc or idc?
It depends on Loop Filter which you use.
lwzunique wrote on Feb 6th, 2017, 7:01pm:vdc and idc are all ideal source, they have no noise contribution to the output,
why the output voltage noise are different when using vdc or idc?
Surely study and consider Loop Filter which you use.
If your loop filter is a type where an input is a current and an output is a voltage, vdc shorts input and so you have to apply idc.
Rather you don't have to apply any source to input.
This is true for Loop Filter after Charge Pump.
Surely study and consider Loop Filter which you use.And noise from Loop Filter is not phase noise.
Output Noises of charge pump and loop filter are not phase noise even if you use them in phase domain model of PLL.