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High-speed signal testing system having oscilloscope functionality

  • US 7,813,297 B2
  • Filed: 07/12/2007
  • Issued: 10/12/2010
  • Est. Priority Date: 07/14/2006
  • Status: Expired due to Fees
First Claim
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1. 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.

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