Optimized wavelength photon emission microscope for VLSI devices
First Claim
1. A system, comprising:
- a detector sensitive to electromagnetic radiation having wavelengths of at least from 1000 nm to 2200 nm;
a plurality of shortpass optical filters;
a selector for selectively placing one of said shortpass optical filters in an optical path that couples a semiconductor device under test (DUT) to the detector; and
,a controller connected to said detector and to said selector, the controller configured to selectively operate in a calibration mode and in a test mode, and wherein;
during calibration mode, the controller operates the selector to successively insert each of said shortpass optical filters within said optical path as the controller records emission signals received by the detector from the DUT, and compares the signal-to-noise ratios of the recorded emission signals; and
,during test mode, the controller operates said selector to insert the shortpass optical filter associated with the highest signal-to-noise ratio of the plurality of shortpass optical filters for a selected test voltage of a plurality of test voltages into the optical path while the controller records emission signals received by the detector from the DUT.
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Abstract
A method for emission testing of a semiconductor device (DUT), by mounting the DUT onto an test bench of an emission tester, the emission tester having an optical detector; electrically connecting the DUT to an electrical tester; applying electrical test signals to the DUT while keeping test parameters constant; serially inserting one of a plurality of shortpass filters into an optical path of the emission tester and collecting emission test signal from the optical detector until all available shortpass filters have been inserted into the optical path; determining appropriate shortpass filter providing highest signal to noise ratio of the emission signal; inserting the appropriate shortpass filter into the optical path; and, performing emission testing on the DUT.
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Citations
15 Claims
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1. A system, comprising:
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a detector sensitive to electromagnetic radiation having wavelengths of at least from 1000 nm to 2200 nm; a plurality of shortpass optical filters; a selector for selectively placing one of said shortpass optical filters in an optical path that couples a semiconductor device under test (DUT) to the detector; and
,a controller connected to said detector and to said selector, the controller configured to selectively operate in a calibration mode and in a test mode, and wherein; during calibration mode, the controller operates the selector to successively insert each of said shortpass optical filters within said optical path as the controller records emission signals received by the detector from the DUT, and compares the signal-to-noise ratios of the recorded emission signals; and
,during test mode, the controller operates said selector to insert the shortpass optical filter associated with the highest signal-to-noise ratio of the plurality of shortpass optical filters for a selected test voltage of a plurality of test voltages into the optical path while the controller records emission signals received by the detector from the DUT. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification