Apparatus and method for testing high-speed serial transmitters and other devices
First Claim
1. A method comprising:
- generating a plurality of first beats based on a comparison of first differential signals to one another using a first comparator, the first differential signals from a device under test;
generating a plurality of second beats based on a comparison of (i) the first differential signals and (ii) second differential signals from a digital-to-analog converter using a second comparator;
receiving at an analyzer the first and second beats, the analyzer coupled to outputs of the first and second comparators; and
determining one or more characteristics of the device under test using the first and second beats at the analyzer.
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Abstract
A testing device for testing a high-speed serial transmitter or other device includes an input stage having a first comparator, a second comparator, and a digital-to-analog converter. The first comparator compares first differential signals from a device under test. The second comparator compares the first differential signals and second differential signals from the digital-to-analog converter. An analysis unit identifies first beats based on an output of the first comparator and second beats based on an output of the second comparator. The analysis unit identifies one or more characteristics of the device under test (such as jitter, differential signal swing, and transition time) based on the first and second beats. A clock unit provides an adjustable clock signal to the comparators. The clock signal may have a frequency shift with respect to a frequency of the device under test.
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Citations
20 Claims
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1. A method comprising:
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generating a plurality of first beats based on a comparison of first differential signals to one another using a first comparator, the first differential signals from a device under test; generating a plurality of second beats based on a comparison of (i) the first differential signals and (ii) second differential signals from a digital-to-analog converter using a second comparator; receiving at an analyzer the first and second beats, the analyzer coupled to outputs of the first and second comparators; and determining one or more characteristics of the device under test using the first and second beats at the analyzer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus comprising:
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a first comparator configured to receive first differential signals from a device under test and to compare the first differential signals to one another and generate a plurality of first beats; a second comparator configured to compare (i) the first differential signals and (ii) second differential signals from a digital-to-analog converter and generate a plurality of second beats; and an analyzer coupled to outputs of the first and second comparators and configured to receive the plurality of first beats from the first comparator, a receive the plurality of second beats from the second comparator, and determine one or more characteristics of the device under test using the first and second beats. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A system comprising:
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a device under test; and a testing device comprising; a first comparator configured to receive first differential signals from the device under test and generate a plurality of first beats based on a comparison of the first differential signals to one another; a second comparator configured to generate a plurality of second beats based on a comparison of (i) the first differential signals and (ii) second differential signals from a digital-to-analog converter; and an analyzer coupled to outputs of the first and second comparators and configured to determine one or more characteristics of the device under test using the first and second beats. - View Dependent Claims (18, 19, 20)
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Specification