Apparatus and method for performing burst triggering in a test and measurement instrument
First Claim
1. A method for isolating an interval of interest in a signal under test in a test and measurement device, the test and measurement device including trigger circuitry and an envelope detector circuit, the method comprising:
- receiving the signal under test at a terminal of the test and measurement device;
the envelope detector circuit producing an envelope signal representing the duration of the envelope from the signal under test, the envelope detector circuit further detecting an edge transition within the signal under test, starting a timer to measure an inactivity time between the detected edge transition and a following adjacent edge transition, resetting the timer at the following adjacent edge transition, and setting an end of the envelope signal when the timer exceeds a predetermined amount;
the trigger circuitry receiving the envelope signal from the envelope detector circuit; and
the trigger circuitry isolating the interval of interest in the signal under test by using the envelope signal, the method further including;
latching a first occurrence of an edge transition in the signal under test as a beginning of the envelope signal, wherein the edge transition is in a certain direction;
responsive to the latched first occurrence of the edge transition, setting the envelope signal to HIGH;
starting the timer upon each occurrence of an edge transition in an opposite direction;
resetting the timer upon each occurrence of an edge transition in the certain direction;
timing out the timer when the timer exceeds the predetermined amount prior to the resetting step; and
responsive to the timer timing out, setting the envelope signal to LOW.
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Accused Products
Abstract
A test and measurement apparatus, system, and method for synchronizing an acquisition or triggering system to a specific burst of interest. The subject apparatus and method triggers on varying energy content of a signal qualified by time in the presence of high-frequency input signal bursts, by using an adjustable pulse width envelope detector, disposed in the signal path of the trigger circuitry, as a digital rectifier or to otherwise process and extract an envelope signal. An RF envelope probe having an analog envelope detector among other suitable components is disclosed. A method is implemented for isolating an interval of interest in a signal under test. An envelope detector circuit produces an envelope signal from the signal. Trigger circuitry receives the envelope signal from the envelope detector, and isolates the interval of interesting in the signal under test using the envelope signal.
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Citations
11 Claims
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1. A method for isolating an interval of interest in a signal under test in a test and measurement device, the test and measurement device including trigger circuitry and an envelope detector circuit, the method comprising:
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receiving the signal under test at a terminal of the test and measurement device; the envelope detector circuit producing an envelope signal representing the duration of the envelope from the signal under test, the envelope detector circuit further detecting an edge transition within the signal under test, starting a timer to measure an inactivity time between the detected edge transition and a following adjacent edge transition, resetting the timer at the following adjacent edge transition, and setting an end of the envelope signal when the timer exceeds a predetermined amount; the trigger circuitry receiving the envelope signal from the envelope detector circuit; and the trigger circuitry isolating the interval of interest in the signal under test by using the envelope signal, the method further including; latching a first occurrence of an edge transition in the signal under test as a beginning of the envelope signal, wherein the edge transition is in a certain direction; responsive to the latched first occurrence of the edge transition, setting the envelope signal to HIGH; starting the timer upon each occurrence of an edge transition in an opposite direction; resetting the timer upon each occurrence of an edge transition in the certain direction; timing out the timer when the timer exceeds the predetermined amount prior to the resetting step; and responsive to the timer timing out, setting the envelope signal to LOW. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification