System for measuring timing relationship between two signals
First Claim
1. A system for measuring a timing relationship between at least two signals comprising:
- first means for measuring waveforms of said at least two signals; and
second means for storing said signals and establishing a reference point for said signals and processing said stored signals to detect a time difference between said signals;
wherein said first means includes an optical system for converting an electrical field of each of said signals to a light signal by light modulation for detecting said signal, and a measuring system for measuring said waveform of each of said signals based upon said electrical field of the signal detected by said first means.
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Accused Products
Abstract
A system for measuring timing relationship between two signals for accurately measuring a timing relationship between signals includes an electro-optic measuring unit and a waveform storage and processing unit. The electro-optic measuring unit samples electrical signals from a device under measurement via a strobe light so as to measure the signal waveform. The electro-optic unit uses a laser diode as a light source. The waveform storage and processing unit stores the electrical signal waveforms measured by the electro-optic measuring unit in digital form. The waveform storage and processing unit also calculates a correlation between two stored electrical signal waveforms via a correlation calculation unit, and also detects a peak of the correlation to detect a timing relationship between the signals.
30 Citations
26 Claims
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1. A system for measuring a timing relationship between at least two signals comprising:
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first means for measuring waveforms of said at least two signals; and second means for storing said signals and establishing a reference point for said signals and processing said stored signals to detect a time difference between said signals; wherein said first means includes an optical system for converting an electrical field of each of said signals to a light signal by light modulation for detecting said signal, and a measuring system for measuring said waveform of each of said signals based upon said electrical field of the signal detected by said first means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A system for measuring a timing relationship between at least two signals comprising:
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first means for measuring waveforms of said at least two signals; and second means for storing said signals and establishing a reference point for said signals and processing said stored signals to detect a time difference between said signals; wherein said first means includes a pulse signal source for supplying pulse signals to pins of an IC under measurement, a plurality of channels for receiving said at least two signals with a number of said channels corresponding to the pins connected to said pulse signal source, means for measuring said at least two signals, and means for adjusting timing of the pulses supplied from said pulse signal source to said pins in accordance with the time difference detected by said second means.
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Specification