Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

phase noise simulation setup for PFD/CP

Status
Not open for further replies.

boshiouke

Junior Member level 3
Joined
Aug 11, 2005
Messages
25
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,283
Activity points
1,528
pfd cp noise

Does anyone know the difference between different "noise type" in Pnoise analysis, i.e "sources", "time domain", "modulated", when simulating for PFD/CP? I'd greatly appreciate it if anyone can show me how to set up the PNoise analysis for PFD/CP using those different "noise type"? I heard that using "timedomain" would result in better phase noise result than "sources". Is that right? Thank you so much.
 

rfsystem

Advanced Member level 3
Joined
Feb 25, 2002
Messages
914
Helped
149
Reputation
294
Reaction score
38
Trophy points
1,308
Location
Germany
Activity points
9,548
There is not "better", there is only correct, or less error prone method to do PFD/CHP phase noise analysis.

If you want to do PN analysis you have to separate the edge jitter controlling the current switches from the current noise. The jitter could be extracted by Pnoise with the time domain method. So the Pnoise analyse the spectral distribution at a specific time point. The best time point is where the logic threshold is. The current noise is limited in the best case by the shot noise. Because of the periodic nature of the current pulses the average noise up to half sampling frequency is proportional to the current on time and higher frequency noise components gets folded from higher frequencies to less than half the reference.

I think the second noise contribution could simulated by Pnoise but with the standard method. In this case you have to use a PFD/CHP in locked condition.
 
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top