International Business Machines Corporation

Joseph Zauchner

Edward S Hoyt

A high impedance voltage probe with excellent high frequency response and extremely light loading of the circuit under test. The probe uses an IGFET input device having its source connected to a constant current source and to an amplifying device, and its drain connected to a variable voltage source. The output of the amplifying device is connected to a constant current source, to a non-linear voltage translating device and to an output terminal. The voltage translating device is also connected to the variable current source.

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South Hero, VT, United States of America

Joseph Zauchner