Acquisition system for a long record length digital storage oscilloscope
First Claim
1. Acquisition System for a long record length digital 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 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, and producing a trigger signal at an output in response to detection of a predetermined trigger event in said signal under test;
an acquisition memory for storing said digital samples of said signal under test in a data record; and
processor circuitry for examining said stored digital samples in a post acquisition mode of operation and producing an event detect signal in response to detection of a predetermined event in said stored digital samples, and causing a predetermined amount of said stored digital samples to be read from said acquisition memory and sent to a signal processing portion of said oscilloscope for processing and display;
said predetermined amount of said stored digital samples being less than the whole data record and being related in time to said event detect signal.
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Accused Products
Abstract
A real time digital storage oscilloscope acquires a long data record in an acquisition memory and processes the data of the long data record to search for predetermined events. Upon detection of such a predetermined event, circuitry generates an event detect signal, and data comprising an acquisition frame surrounding the event is applied to a waveform processing and display system. The long data record can be replayed in order to perform additional searches throughout the data record using different search criteria, thereby permitting multiple waveforms to be displayed simultaneously, each being captured as a result of a different user-defined event. A screen display may be programmed to display a different kind of event such as Runt signal, Overshoot, or Pulsewidth Violation in each waveform, or to display multiple occurrences of the same kind of event such as Runt signal in each waveform.
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Citations
31 Claims
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1. Acquisition System for a long record length digital oscilloscope, comprising:
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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 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, and producing a trigger signal at an output in response to detection of a predetermined trigger event in said signal under test;
an acquisition memory for storing said digital samples of said signal under test in a data record; and
processor circuitry for examining said stored digital samples in a post acquisition mode of operation and producing an event detect signal in response to detection of a predetermined event in said stored digital samples, and causing a predetermined amount of said stored digital samples to be read from said acquisition memory and sent to a signal processing portion of said oscilloscope for processing and display;
said predetermined amount of said stored digital samples being less than the whole data record and being related in time to said event detect signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A long record length digital oscilloscope, comprising:
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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 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, and producing a trigger signal at an output in response to detection of a predetermined trigger event in said signal under test;
an acquisition memory for storing said digital samples of said signal under test in a data record;
a demultiplexer unit coupled between said analog-to-digital converter and said acquisition memory for receiving said digital samples and controlling the flow of said samples to said acquisition memory in response to said trigger signal received from said trigger circuit;
processor circuitry for examining said stored digital samples in a post acquisition mode of operation and producing an event detect signal in response to detection of a predetermined event in said stored digital samples, and producing memory address signals indicative of a range of memory locations containing data relating to said predetermined event; and
a system processor for causing a predetermined amount of said stored digital samples to be read from said acquisition memory and sent to a signal processing portion of said oscilloscope for processing and display in response to said event detect signal and said memory address signals;
said predetermined amount of said stored digital samples being less than the whole data record and being related in time to said event detect signal. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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24. A long record length digital oscilloscope, comprising:
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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 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, and producing a trigger signal at an output in response to detection of a predetermined trigger event in said signal under test;
an acquisition memory for storing said digital samples of said signal under test in a data record;
a demultiplexer unit coupled between said analog-to-digital converter and said acquisition memory for receiving said digital samples and controlling the flow of said samples to said acquisition memory in response to said trigger signal received from said trigger circuit; and
a system processor for examining said stored digital samples in a post acquisition mode of operation for detecting a predetermined event in said stored digital samples;
said system processor causing a predetermined amount of said stored digital samples to be read from said acquisition memory and sent to a signal processing portion of said oscilloscope for processing and display in response to said detection of said predetermined event;
said predetermined amount of said stored digital samples being less than the whole data record and being related in time to said event detect signal. - View Dependent Claims (25, 26, 27, 28)
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29. A method for use in an oscilloscope for displaying a waveform of interest extracted from an acquisition of a long data record, comprising the steps of:
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acquiring a long data record in an acquisition memory;
examining the data of the long data record in a post processing mode of operation for the occurrence of a user-defined event;
upon detection of such a predetermined event, applying data comprising an acquisition frame surrounding the event to a waveform processing and display system. - View Dependent Claims (30, 31)
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Specification