Patent ID: 7813297

Claim:
A system for testing a high-speed repeating data signal, comprising: a time-base generator responsive to a reference clock signal so as to generate a high-speed repeating signal; a one-bit voltage digitizer for digitizing the high-speed repeating data signal into a digitized signal as a function of the high-speed repeating signal; a digital comparator for comparing the digitized signal to a selected digital value and outputting comparator results as a function of the high-speed repeating signal; a bit-shift and frequency-divider block responsive to the high-speed repeating signal so as to produce a slowed clock signal; a sub-sampler for sub-sampling the comparator results as a function of the slowed clock signal so as to output sub-sampled results; a modulo N address counter, wherein N is greater than zero, for providing write addresses as a function of the high-speed repeating signal; and an accumulation memory for storing ones of the sub-sampled results as a function of the slowed clock signal and corresponding respective ones of the write addresses.