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# Binary to Analogue Converter

IP.com Disclosure Number: IPCOM000098950D
Original Publication Date: 1962-Feb-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 42K

IBM

## Related People

Pettus, C: AUTHOR [+2]

## Abstract

The binary to analogue converter utilizes magnetoresistive elements. These vary in resistance in accordance with the applied magnetic field. The elements are connected in series with a constant current source. When the applied magnetic field is parallel to current flow, the resistance of the element increases. When the magnetic field is perpendicular to the direction of current flow, the resistance decreases.

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Binary to Analogue Converter

The binary to analogue converter utilizes magnetoresistive elements. These vary in resistance in accordance with the applied magnetic field. The elements are connected in series with a constant current source. When the applied magnetic field is parallel to current flow, the resistance of the element increases. When the magnetic field is perpendicular to the direction of current flow, the resistance decreases.

The number of magnetoresistive elements M, arranged in a column, is according to the binary weight 1, 2, 4, 8, etc., of the input. All elements M are connected in series with battery B. Voltage taps are connected to each element M at right angles to the direction of current flow. The various voltage taps are connected in series to provide a single output from the array. An electromagnet E is provided for each column of elements M, the inputs to the various magnets being A, B, C, D, etc.

The binary inputs are energized in the selected pattern to switch the resistance state of elements M in the corresponding columns. Since the output taps on the elements are in series, the total output varies in accordance with the number of elements switched. For example, a binary input of 0101 (decimal 10) energizes the B and D inputs to switch ten elements.

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