Abstract
This paper describes a measurement principle for calculating component values from measurements conducted under less than optimal conditions, as is the case in the IEEE Std 1149.4 environment. Also presented are equations that take into account switch resistances on the signal paths, the output resistance of the signal generator, and the loading effect caused by the input impedance of the voltmeter together with the pin capacitances in parallel to the voltmeter. In addition, the paper presents characterization methods to determine values for these impedances. The inaccuracies achieved in the impedance range from kΩ to MΩ are of the order of few percent.
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References
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Acknowledgments
National Semiconductor Corp. is thanked for providing us with the STA400s. To JTAG Technologies we are grateful for the boundary-scan controller and the software. In addition, the Finnish Funding Agency for Technology and Innovation (Tekes), Nokia and Elektrobit Group are gratefully acknowledged for funding the Embedded Testing of Mixed-Signal Devices Project, under which this work was carried out. Finally, we wish to acknowledge Polar Electro.
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Saikkonen, T., Moilanen, M. Component Value Calculations and Characterizations for Measurements in the IEEE 1149.4 Environment. J Electron Test 23, 569–579 (2007). https://doi.org/10.1007/s10836-007-5008-4
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DOI: https://doi.org/10.1007/s10836-007-5008-4