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Design >> Mixed-Signal Design >> Comparison of RMS Jcc [40,000] in BW vs. Manual Integrated Noise in a BW.
https://designers-guide.org/forum/YaBB.pl?num=1333569725

Message started by ic_engr on Apr 4^th, 2012, 1:02pm

Title: Comparison of RMS Jcc [40,000] in BW vs. Manual Integrated Noise in a BW.
Post by ic_engr on Apr 4^th, 2012, 1:02pm

Hello,

I have a ring oscillator. I ran pss-pnoise (modulated). I then tried to calculate Jcc using the form. I have the following questions:

1. Jcc [k] cycles. Does k refer to 1000s or just number of cycles. What I am asking is if I enter 100 is the calculation based on k=100 cycles or is it assuming 100K cycles i.e. 100,000 cycles.

I then caclulated Jcc for 40,000k cycles and I integrated the BW from 1kHz to 2MHz and I got Jcc=2.2nsec. I set the calculation as RMS.

2. I also ploted PNOISE magnitude and performed square, integrated in 1kHz-2MHz and then Square rooted. I got 23.7mV. I measured the slew rate of one cycle of the oscillator in pss simulation The SR=70MV/sec.
I divided 23.7mV/70MV/sec and got 338.7psec. I am assuming this is RMS.

So now can anyone explain me the relation of JCC based on 40,000 cycles for the same BW giving me 2.2nsec and the (2) jitter manual calculation is giving 338psec. Can Jcc be assumed peak to peak of 338pSec.

Please enlighten.

Regards

ic_engr