Combined analog and DSP trigger system for a digital storage oscilloscope
AssigneeTektronix, Inc.
InventorsJohn J. Pickerd, Que Thuy Tran
Life of this patent
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Abstract
A combined analog and DSP trigger system for a digital storage oscilloscope (DSO) enables the DSO to real-time trigger on events in an input analog signal based on traditional trigger events in the input analog signal and/or predetermined anomalous events detected in digitized samples of the input analog signal. A processor receives the digitized samples at the input of an acquisition memory to detect the anomalous events and provides an event detect signal to the trigger system. Predetermined amounts of the digitized samples around the events are acquired in an acquisition memory for further processing and display.
Claims13
An acquisition system for a digital storage oscilloscope comprising:
- an input terminal for receiving a signal under test;
- an analog-to-digital converter having an input coupled to said input terminal for receiving said signal under test and for producing digital samples of said signal under test at an output;
- a trigger circuit having an input coupled to said input terminal for receiving said signal under test to produce a first trigger signal at an output of the trigger circuit in response to detection of a first predetermined trigger event in said signal under test;
- an acquisition memory having an input for receiving and storing said digital samples of said signal under test in a data record;
- and
- processor circuitry having an input coupled to said input of said acquisition memory for receiving and examining said digital samples in a real-time mode of operation and for producing an EVENT DETECT signal in response to detection of a predetermined anomalous event in said digital samples to cause a predetermined amount of said digital samples to be sent to a signal processing portion of said oscilloscope for processing and display, said predetermined amount being related in time to said predetermined anomalous event.
Dependencies are inferred from the claim text.