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how to calculate Jitter in spectre

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Jitter of a vco

Hi,

I'm trying to measure the phase noise of my CMOS vco at 8GHz. I get pretty decent phase noise curve at higher tuning voltages (i.e. lower capacitance value) but at lower tuning voltages the drift is too much to make a decent phase noise measurement using a PSA.

NOw I want to quantify the instability at lower tune voltages by measuring the jitter. My questions are:

1. is measuring jitter the best way to judge the stability of the vco
2. If so, then how to measure jitter with a 6GHz LeCroy scope?

Thanks,
Adil.
 

Jitter of a vco

Hi,
What is 6GHz the bandwidth or sampling rate pls?
If its a 6GHz bandwidth scope, & it will triggern_I think you can calculate/compensate for ca. 6dB/octave less amplitude...
K.
 

Re: Jitter of a vco

karesz said:
Hi,
What is 6GHz the bandwidth or sampling rate pls?
If its a 6GHz bandwidth scope, & it will triggern_I think you can calculate/compensate for ca. 6dB/octave less amplitude...
K.
Click to expand...

It's the b/w. Could you elaborate further please.

Thanks,
Adil.

Added after 6 minutes:

biff44 said:
use a delay line frequency discriminator.
Click to expand...

That's a good suggestion. I've not done it before but I'll try to find out more about it. IN the meantime I'm trying to get my hands on a signal source analyzer which has a reference source in quadrature & it locks the vco for a phase noise measurement. Anybody has experience with a signal source analyzer?

Thanks,
Adil.
 

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