Browse Prior Art Database

Sense Amplifier

IP.com Disclosure Number: IPCOM000095765D
Original Publication Date: 1964-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Levi, MW: AUTHOR

Abstract

A magnetic thin film cylindrical device is utilized as a sense amplifier. The device includes cylindrical tube 10 with a magnetic film on its surface, bit drive line 2, word drive line 4 and output windings 6.

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Sense Amplifier

A magnetic thin film cylindrical device is utilized as a sense amplifier. The device includes cylindrical tube 10 with a magnetic film on its surface, bit drive line 2, word drive line 4 and output windings 6.

Device 10 is fabricated such that the direction of easy magnetization is along the longitudinal axis in the direction of arrow A. The direction of hard magnetization is circumferential about device 10 in the direction of arrow B. With the magnetization in the direction of arrow A, a reset pulse along line 2 serves to orient the magnetization in the circumferential direction of arrow B.

The lower drawing indicates dipole and anisotropic energy versus orientation. Dipole energy is at a minimum when the magnetization is entirely in the hard direction. Therefore, when the reset pulse alters the magnetization from the direction of arrow A to that of arrow B, the magnetization is in a position of metastable equilibrium. When in this position, a pulse less than magnitude C does not disturb the magnetization sufficiently to produce a readout signal. A pulse equal to magnitude C produces a much larger pulse of magnitude D, thus providing the device with amplifying characteristics.

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