The Designer's Guide Community
Welcome, Guest. Please Login or Register. Please follow the Forum guidelines. Aug 23rd, 2017, 2:48am
  HomeHelpSearchLoginRegisterPM to admin  
Pages: 1
Send Topic Print
Phase noise using noisetype=sources vs noisetype=pmjitter (Read 77 times)
Community Member

Posts: 59

Phase noise using noisetype=sources vs noisetype=pmjitter
Jul 19th, 2017, 6:20am

I have few question regarding pnoise available in spectreRF.

1) For a square wave, the phase information is only present at the rising or falling edges. Thus, the phase noise(in dBc/Hz) obtained from noisetype=sources will be equal to the one obtained from the one using noisetype=pmjitter(the voltage noise is converted to phase noise).

Is the above reasoning applicable to sinusoid oscillators(VCO,crystal)? I think pmjitter cannot be applied to these cases. So if there are sinusoid then only noisetype=sources is applicable.

2) For a driven circuit, if one limits the amplitude using a VCVS(limiter with gain=1 around the threshold crossing) and use noisetype=sources. The phasenoise obtained using this method will be the same as the one obtained using pmjitter. So the utility of pmjitter is not clear. Can someone clarify?


Back to top
View Profile   IP Logged
Pages: 1
Send Topic Print
Trouble viewing this site? Copyright © 2002-2014 Designer's Guide Consulting. 'Designer's Guide' is a registered trademark of Designer's Guide LLC. All rights reserved.

Our colleges are not as safe as they seem. Sexual assault is pervasive and the treatment of the victim by the adminstration is often as damaging as the assault: Campus Survivors, Campus Survivors Forum.

Some of our other sites that you might find useful: QuantiPhy.