The Designer's Guide Community
Forum
Welcome, Guest. Please Login or Register. Please follow the Forum guidelines.
Oct 21st, 2020, 12:32pm
Pages: 1
Send Topic Print
Question on PLL's phase noise test (Read 1248 times)
seekconfessor
New Member
*
Offline



Posts: 4

Question on PLL's phase noise test
Jun 08th, 2016, 6:48am
 
I am using a spectrum analyzer to measure a PLL's output normalized phase noise L(f);
My measurement method is Direct Spectrum Measurement and the spectrum analyzer is set: RBW=1KHz, detector=average;
On L(f) calculation, Stanley_J._Goldman's book "Phase-Locked Loop Engineering Handbook for Integrated Circuits" introduced one way as the attached picture show.
While, some Agilent spectrum analyzer manual books say, the phase noise under test should be:
L(fm)=P(fm)-Pc-10*log10(RBW)+2.5;
I am wondering which one is correct for phase noise test.
Thanks.
Back to top
 

1_017.jpg
View Profile   IP Logged
Pages: 1
Send Topic Print
Copyright 2002-2020 Designer’s Guide Consulting, Inc. Designer’s Guide® is a registered trademark of Designer’s Guide Consulting, Inc. All rights reserved. Send comments or questions to editor@designers-guide.org. Consider submitting a paper or model.