Browse Prior Art Database

Analog To Digital Converter

IP.com Disclosure Number: IPCOM000098367D
Original Publication Date: 1960-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Henle, RA: AUTHOR

Abstract

The magnetic core circuit performs analog to digital conversion.

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Analog To Digital Converter

The magnetic core circuit performs analog to digital conversion.

The bias line B is supplied with a constant D. C. current of ten units magnitude. Each of the paralleled current sink resistors R carries one unit of current to ground so the bias level of the cores descends from ten units for core 10 to one unit for core 1. The cores are identical and have a non linear hysteresis cycle similar to that shown above. The magnitude of one unit of bias compared with the hysteresis characteristic of the core is sufficient to carry the core well into saturation.

The D. C. analog signal to be digitalized is admitted to input winding A. This signal opposes the bias in each core. The forces H(b), due to the bias, and H(a), due to the analog input, produce a net difference force in each core, holding each core but one in either a positive or negative saturation condition. The one core having a bias force equal to the analog input force has no net difference bias. A limited amplitude A. C. exciting signal is applied to all cores through a sample winding S. The cores having a net difference bias of one unit or more are unaffected by the A. C. signal, since they are biased well into saturation. The core having equal bias and analog input forces, however, is driven through its hysteresis cycle and induces an A. C. output, thus providing a signal on the digit output line corresponding to the amplitude of the input signal.

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