Teradyne, Inc.

J Anson Whealler, Jr

Michael R Ferland

Roger V Burns, Jr

Apparatus for measuring the difference between two voltages in which a first current proportional to the voltage difference is generated at a first point, and there is circuitry for delivering at a second point a second current that is based on the first current and is indicative of the voltage difference; the circuitry includes an uninterrupted current path from the first point to the second point and the current path has a circuit element across which at least a portion of the common mode voltage appears; and the circuit element provides an output current to the path which is independent of the voltage across the circuit element.

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Cohasset, MA, United States of America

J Anson Whealler, Jr