What does rad2/Hz unit for VCO phase noise mean?

For a VCO I measured in lab -30dBrad2/Hz of phase noise. Most of the examples I've seen express the phase noise in units of dBc/Hz, which I understand is the ratio of noise with respect of the carrier at a frequency offset.

What does rad2/Hz mean ?

regards !

Sounds like you measured integrated jitter instead. That's an unusual unit, what did you use to measure it?

Dave

I used a vector signal analyzer Agilent 89410A. Want to measure the phase noise but the units rad2/Hz confuse me. Someone has used a similar instrument to obtain phase noise in dBc/Hz units ?

www.minicircuits.com/appnote/vco15-6.pdf

http://surf.syr.edu/projects/vco/Phase_Noise.htm

Play around with the marker menu. That is where Agilent likes to hide those sorts of things.

Dave