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Electronic Analog Output

IP.com Disclosure Number: IPCOM000096774D
Original Publication Date: 1963-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Propster, CH: AUTHOR

Abstract

This analog storage device produces a continuous AC output which is proportional to the stored analog value. The device has a 4 legged magnetic structure. The analog input signal applied to the control terminals is in the form of a steady current or a series of direct current or voltage pulses. Since the control winding is wound on leg 1, made of square loop material, the analog input signal has the effect of driving the leg along the hysteresis curve and establishing a steady state flux phi(1) which is a function of the input signal.

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Electronic Analog Output

This analog storage device produces a continuous AC output which is proportional to the stored analog value. The device has a 4 legged magnetic structure. The analog input signal applied to the control terminals is in the form of a steady current or a series of direct current or voltage pulses. Since the control winding is wound on leg 1, made of square loop material, the analog input signal has the effect of driving the leg along the hysteresis curve and establishing a steady state flux phi(1) which is a function of the input signal.

AC is applied to the drive winding on leg 3 to saturate the square loop portion of this leg. Saturation of a portion of this leg greatly increases the reluctance of the path including legs 1 and 3. The result of the increased reluctance is to divert flux into leg 4. Rapid changes in flux in leg 2 are prohibited by the shorted turn. The output winding provides an AC signal proportional to the diverted flux which in turn is proportional to the flux M in the leg 1.

Since the residual flux M1 is a function only of the analog input signal and the air gap in leg 4, the AC output signal is completely independent of drive current excursions above a minimum level. The use of a separate leg for the feedback winding allows compensation for temperature sensitivity, improved linearity, and various dynamic or DC load changes.

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