Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1987-12-07
1990-01-23
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324 77A, 324158D, G01R 3126
Patent
active
048961094
ABSTRACT:
A photoconductive reflectometer for characterizing semiconductor devices at millimeter wavelength frequencies where a first photoconductive circuit element (PCE) is biased by a direct current voltage source and produces short electrical pulses when excited into conductance by short first laser light pulses. The electrical pulses are electronically conditioned to improve the frequency related amplitude characteristics of the pulses which thereafter propagate along a transmission line to a device under test. Second PCEs are connected along the transmission line to sample the signals on the transmission line when excited into conductance by short second laser light pulses, spaced apart in time a variable period from the first laser light pulses. Electronic filters connected to each of the second PCEs act as low-pass filters and remove parasitic interference from the sampled signals and output the sampled signals in the form of slowed-motion images of the signals on the transmission line.
REFERENCES:
patent: 3278846 (1966-10-01), Patten et al.
David H. Auston, "Impulse Response of Photoconductors in Transmission Lin" IEEE J. Quantum Electron, vol. QE-19, No. 4, 639-647, (Apr. 1983).
William R. Eisenstadt, Robert B. Hammond and Robert W. Dutton, "On-Chip Picosecond Time-Domain Measurements for VLSI and Interconnect Testing using Photoconductors," IEEE Trans. Electron Devices, vol. ED-32, No. 2, 364-369, (Feb. 1985).
Gaetjens Paul D.
Karlsen Ernest F.
Moser William R.
The United States of America as represented by the Department of
Wyrick Milton D.
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