Peak to peak Vref AC noise amplitude

Hi,In DDR2, VREF(t) may temporarily deviate from VREF(DC) by no more than +/-1% VDD.When I referred few datasheets and the signal level- diagrams from variouswebsites, I get different values.***Please confirm me which one is right?***Let us take Vref (DC) is 0.9V                VDD= 1.8VThen Peak to peak Vref AC noise amplitude = 18mvOrThen Peak to peak Vref  AC noise amplitude = 36mvORThen Peak to peak Vref  AC noise amplitude = 72 mv  (Please refer Micronâ??sdatasheet)Please clarify.-- Best Regards,Balamanikandan.K
kbmanick 7 years 3 months 26 days

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