Browse Prior Art Database

Signal Shaping in a Magnetic Thin Film Storage Device

IP.com Disclosure Number: IPCOM000093973D
Original Publication Date: 1966-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Siegle, WT: AUTHOR

Abstract

In the operation of a magnetic thin-film storage device, the tendency arises for the word line voltage transients to capacitively couple to the sense lines. On interrogation, since the device and noise signals arising from the capacitive coupling occur essentially simultaneously, but are out of phase, the possibility of an erroneous detection arises when noise and sense signals are of opposite polarity. A mode of operation is provided that alters the shape of the device signal to reduce the phase difference between that device signal and the noise signal.

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Signal Shaping in a Magnetic Thin Film Storage Device

In the operation of a magnetic thin-film storage device, the tendency arises for the word line voltage transients to capacitively couple to the sense lines. On interrogation, since the device and noise signals arising from the capacitive coupling occur essentially simultaneously, but are out of phase, the possibility of an erroneous detection arises when noise and sense signals are of opposite polarity. A mode of operation is provided that alters the shape of the device signal to reduce the phase difference between that device signal and the noise signal.

Conventionally, in interrogating a thin-film device, the magnetic dipoles are rotated upon the application of a word pulse, from an alignment along the easy axis of magnetization 2, drawing A, to a direction 90 degrees away from that easy axis of magnetization, the hard axis 3. The sense loop detects the easy axis component of flux, which is related to, but not directly proportional to, the rate of change of interrogation current. Accompanying this flux signal is a noise signal which is directly proportional to the rate of change of interrogation current.

Now, by biasing the magnetic dipole alignment along arrow 4 from the easy axis of magnetization 2, the phase difference between the device and the capacitive noise signals is reduced. Thus when the device signal and noise signal are of opposite polarity, the possibility of an erroneous detection is reduced,...