USA As Represented by Secretary of the Navy

Gene L Haviland

Patrick A Shoemaker

Isaac Lagnado

Alfons Tuszynski

James R Feeley

A non-volatile analog memory circuit includes charge depositing and storing ircuitry, voltage sensing circuitry, and closed-loop control circuitry. The charge depositing and storing circuitry includes a floating gate operable to receive charge deposited on it. The voltage sensing circuitry supplies an analog output in response to the sensed gate potential. The closed-loop control circuitry is used to control charge deposition. The control circuitry is operable to change the charge on the gate by directing electrical pulses of appropriate polarity to the charge depositing and storing circuitry. This is done to diminish the error between the analog output signal of the charge sensing circuitry and an analog input signal for providing a substantially accurate representation of the analog input signal.

Non-volatile analog memory circuit with closed-loop control

A four-quadrant analog multiplier circuit provides an output which is proportional to two voltage inputs. The circuit includes a pair of depletion mode transistors having gain constants equal in magnitude and threshold voltages equal in magnitude. The gates of the transistors are coupled in common. One input is applied to the common gates. The other input and its inverse are separately applied to source/drain terminals of the two transistors.

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San Diego, CA, United States of America

Gene L Haviland