Patent ID: 8335950

Claim:
A test and measurement instrument, comprising: an input configured to receive an input analog signal; a digitizer coupled to the input and configured to receive and digitize the input analog signal and produce a digitized representation of the input analog signal; an acquisition circuit coupled to the digitizer and configured to acquire the digitized representation of the input analog signal; a data recovery circuit, coupled to the input via a path not including the digitizer and the acquisition circuit, and configured to recover digitized data encoded in the input analog signal; and a bit-error trigger circuit coupled to the data recovery circuit and configured to trigger an acquisition of the acquisition circuit in response to detection of a bit-error in the recovered digitized data; wherein the bit-error trigger circuit comprises: a pattern detector configured to identify a reference sequence of reference digitized data in the recovered digitized data and generate a synchronization signal in response thereto; a memory configured to store reference digitized data and output the reference digitized data in response to the generation of the synchronization signal by the pattern detector; and a comparator configured to compare the digitized data to the output reference digitized data and generate a comparison signal in response thereto.