During immunity testing (ESD, EFT) of a digital circuit, the waveforms of critical signal nets need to be measured for analyzing the failure mechanism. However, it is difficult to measure the induced voltage in the circuit under test due to the unwanted coupling by the non-ideal shielding of the probe cable, especially, if large common mode currents are present. Fiber optical connection avoids this problem. Semiconductor lasers have frequently been used for converting the voltage into an optical signal. The paper shows novel implementations of powering the laser, leading to a small, low cost optical probe.
C. Ding and D. Pommerenke, "Laser Optical In-circuit Measurement System for Immunity Applications," Proceedings of the 2006 IEEE International Symposium on Electromagnetic Compatibility, 2006, Institute of Electrical and Electronics Engineers (IEEE), Jan 2006.
The definitive version is available at http://dx.doi.org/10.1109/ISEMC.2006.1706373
2006 IEEE International Symposium on Electromagnetic Compatibility, 2006
Electrical and Computer Engineering
Keywords and Phrases
EM Coupling; Non-Ideal Shielding; Optical Link; Susceptibility Test
Article - Conference proceedings
© 2006 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.