Patent ID: 6185509
Filing Date: 2001-02-06
Classification: G01R

Abstract:
An apparatus for generating an auto-correlation function representing periodic jitter in a repetitive waveform, including:a signal timing circuit for timing a duration of a series of ""N"" consecutive periods in a repetitive waveform, where N is an integer, to provide a time value associated with the value N;a span select logic circuit for controllably altering the number N, to facilitate a timing of different durations associated with different period spans;a memory for storing the time values in multiple sets, each set including multiple time values associated with a different value of N;processing circuitry for determining multiple variance values, each variance value associated with one of the sets, and generated based on the data in its associated set; anda function generating circuit for generating an array of the variance values as a function of the values of N.