Browse Prior Art Database

Analog to Digital Converter

IP.com Disclosure Number: IPCOM000098640D
Original Publication Date: 1959-Aug-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Melan, EH: AUTHOR [+2]

Abstract

A multi-apertured bistable ferrite core is used for conversion of an instantaneous analog signal to a digit pulse. The core is constructed so that the cross sectional area of leg 0 is equal to the sum of the areas of the other legs. This configuration provides nine flux paths of uniformly increasing lengths, each linking leg 0 and one of the other legs.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 83% of the total text.

Page 1 of 2

Analog to Digital Converter

A multi-apertured bistable ferrite core is used for conversion of an instantaneous analog signal to a digit pulse. The core is constructed so that the cross sectional area of leg 0 is equal to the sum of the areas of the other legs. This configuration provides nine flux paths of uniformly increasing lengths, each linking leg 0 and one of the other legs.

Legs 1-9 are initially saturated in a reset direction by energizing the reset winding in the direction shown. A force in the opposite direction is applied by the bias winding to bias leg 1 toward threshold so that a predetermined additional applied field causes the leg to switch. The analog current sample is applied to the input winding in the direction shown. The force developed by the analog current causes a flux reversal in certain of the legs 1-9. Since the field developed by the input current varies inversely with distance and the flux paths linking the legs 1-9 are of uniformly.increasing length, the number of legs switched varies in direct proportion to the current amplitude. The sense lines 1-9 have voltages induced in them when the associated legs are switched, and the outputs on the sense lines provide digit pulses. The INVERTER 10 and EXCLUSIVE OR circuits 11 provide an output only from the highest numbered sense line energized.

A converter providing several digit orders may be constructed by using one circuit of the type shown for each order. The characteristics of the cores...