NASA NTRS · 19780000148
Symmetric voltage-controlled variable resistance
Abstract
Feedback network makes resistance of field-effect transistor (FET) same for current flowing in either direction. It combines control voltage with source and load voltages to give symmetric current/voltage characteristics. Since circuit produces same magnitude output voltage for current flowing in either direction, it introduces no offset in presense of altering polarity signals. It is therefore ideal for sensor and effector circuits in servocontrol systems.
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Vanelli, J. C.. 1978-10-01. Symmetric voltage-controlled variable resistance. https://ntrs.nasa.gov/citations/19780000148
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