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Bubble Domain Divide by 4 Frequency Divider

IP.com Disclosure Number: IPCOM000082568D
Original Publication Date: 1974-Dec-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Lin, YS: AUTHOR [+2]

Abstract

An AC coupled flip-flop circuit may be used as a single stage in a frequency divider. Conventionally, a chain of such binary divider circuits is used to provide a frequency divider. A new implementation of a divide-by-4 bubble domain circuit is provided using only a single stage to perform a division of 4, therefore offering significant space savings.

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Bubble Domain Divide by 4 Frequency Divider

An AC coupled flip-flop circuit may be used as a single stage in a frequency divider. Conventionally, a chain of such binary divider circuits is used to provide a frequency divider. A new implementation of a divide-by-4 bubble domain circuit is provided using only a single stage to perform a division of 4, therefore offering significant space savings.

The basic divide-by-4 stage uses ion-implanted structures in which the background is an ion-implanted region, while the shaded regions are non-ion implanted. Each non-implanted disk-shaped region has a three-fold symmetry, due to the anisotropy of the magnetostriction tensor. Therefore, in response to an in-plane rotating field, bubble domains move from channel A to the right until they come to idler 1. Initially, there is no bubble domain in the idler. Because of the three-fold symmetry, three consecutive bubbles will be loaded into the idler.

As the fourth bubble comes along channel A and reaches position 1, bubble domain interactions will occur causing this fourth bubble to be repelled by the bubble domains in the idler. As a result, the fourth bubble will travel to channel B while the three bubbles initially in the idler will be forced into channel C, where they can eventually be annihilated.

When the idler is emptied, the circuit is ready for the loading of the next three consecutive bubble domains. The output channel B receives only every fourth input bubble domain f...