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Analog Multiplier and Control Device

IP.com Disclosure Number: IPCOM000098920D
Original Publication Date: 1958-Dec-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Smith, JT: AUTHOR

Abstract

Photo magneto electric (PME) effect in semiconductors is utilized to provide multiplication of two or three variables. When a semiconductor is placed in a magnetic field and is illuminated in a direction perpendicular to this field, a voltage is developed across the semiconductor by the PME effect in a direction mutually perpendicular to the direction of illumination and of the magnetic field. The magnitude of the PME voltage is dependent upon the intensity of the illumination, the area illuminated, and the strength of the magnetic field.

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Analog Multiplier and Control Device

Photo magneto electric (PME) effect in semiconductors is utilized to provide multiplication of two or three variables. When a semiconductor is placed in a magnetic field and is illuminated in a direction perpendicular to this field, a voltage is developed across the semiconductor by the PME effect in a direction mutually perpendicular to the direction of illumination and of the magnetic field. The magnitude of the PME voltage is dependent upon the intensity of the illumination, the area illuminated, and the strength of the magnetic field.

One variable to be multiplied modulates the intensity of illumination from the light source, another variable controls the opening of the variable aperture, and a third variable controls the current supplied to the electromagnet, to produce across the semi-conductor strip a voltage having a magnitude which is a measure of the product of the three variables. Alternatively, an alternating current signal of known frequency may be substituted for one of the variable inputs to produce an alternating current output signal to facilitate amplification.

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