Digital trigger
AssigneeTektronix, Inc.
InventorsSteven K. Sullivan, Kristie Veith, Terrance R. Beale
Life of this patent
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Abstract
An improved digital trigger circuit has a plurality of data samples extracted from an input electrical signal for each sample clock cycle. The plurality of data samples are compared in parallel with a high threshold level and a low threshold level which provides hysteresis for noise rejection. Also the plurality of data samples are used to determine sub-sample trigger positioning. The comparison outputs are input to a digital trigger logic circuit for identifying a selected trigger event and generating a trigger for the acquisition of data from the input electrical signal for analysis and display. The digital trigger logic provides edge event triggering, pulse width triggering and transition time triggering, among others.
Claims6
An improved digital trigger circuit of the type having a plurality of data samples digitized by a sample clock from an input electrical signal for each system clock cycle wherein the improvement comprises:
- means for comparing each of the plurality of data samples with a low threshold value and a high threshold value to produce a plurality of above-high and a plurality of below-low threshold signals per system clock cycle;
- and
- means for logically processing in parallel the plurality of above-high and a plurality of below-low threshold signals to identify a selected trigger event.
Dependencies are inferred from the claim text.