Voltage source measurement unit with minimized common mode errors
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United States of America Patent
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Sep 30, 2008
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app pub date -
Nov 20, 2007
filing date -
Nov 20, 2007
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Abstract
A particular configuration of voltage source measurement (VSM) circuitry minimizes common mode errors in measurement of current through a device under test (DUT), even across a wide range of output voltages. The current I.sub.DUT is not affected by common-mode errors, since the current measurement is based on the output voltage of an operational amplifier or a differential amplifier, and the circuit configuration is such that the current measurement is made while the operation amplifier or differential amplifier has very low common-mode input voltage.
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