mario
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Can I estimate ring pll jitter by measuring ring VCO tuning voltage ripple?
After measuring loop filter output voltage : Vtune average and Vtune peak voltages for locked PLL
Calculation: VCO average freq = Fvco_av [Hz] = Vtune_av [V] * Kvco[Hz/V]; VCO average period =Tvco_av= 1/Fvco_av [s] VCO peak freq= Fvco_pk = Vtune_pk [V] * Kvco[Hz/V]; Jitter [s] = {(Fvco_pk - Fvco_av)/Fvco_av } * Tvco_av [s]
Is the above correct estimation of ring pll jitter?
Thank you
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