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Bubble Domain Analog To Digital Converter

IP.com Disclosure Number: IPCOM000076023D
Original Publication Date: 1971-Dec-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Chang, H: AUTHOR [+2]

Abstract

This converter can be used for analog-to-digital and digital-to-analog conversion. The basic circuit is shown in Fig. 1 in which one arm 10 of the bridge circuit 12 contains a series of connected magnetoresistive elements, which are shown in more detail in Fig. 2. A null detector 14 is located in the center of the bridge and is also connected to a control loop which regulates the number of bubble domains entered into magnetoresistive arm 10. This connection is indicated by lead 16. An analog signal V(t) is applied to the bridge.

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Bubble Domain Analog To Digital Converter

This converter can be used for analog-to-digital and digital-to-analog conversion. The basic circuit is shown in Fig. 1 in which one arm 10 of the bridge circuit 12 contains a series of connected magnetoresistive elements, which are shown in more detail in Fig. 2. A null detector 14 is located in the center of the bridge and is also connected to a control loop which regulates the number of bubble domains entered into magnetoresistive arm 10. This connection is indicated by lead 16. An analog signal V(t) is applied to the bridge.

In operation, the number of bubble domains in the vicinity of magnetoresistive arm 10 determines the signal developed by that arm. As the signal increases it will balance the analog signal V(t).

The null detector will then activate control loop 16 to stop further emission of bubbles into magnetoresistive arm 10.

The magnetoresistive arm 10 is shown in more detail in Fig. 2, while Fig. 3 shows the analog signal V(t). In Fig. 2, a bubble generator 18 emits bubbles at six intervals delta t. These bubbles enter the vicinity of magnetoresistive arm 10 if a control signal is not present in control loop 16. In Fig. 2, arm 10 is comprised of series connected magnetoresistive elements 10A-10F. These elements are connected to constant-current source 22 which supplies measuring current I(s). As the number of bubbles passing arm 10 increases, there is an incremental increase in voltage across arm 10 due to th...