Browse Prior Art Database

Strobe Switch

IP.com Disclosure Number: IPCOM000097769D
Original Publication Date: 1961-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Laczko, L: AUTHOR

Abstract

Signal to noise discrimination in a magnetic core memory sensing system is improved by gating or strobing the output only during the periods when an information signal is expected to appear. This is usually accomplished by gating devices provided at the output of the sense amplifier. This circuit is an improved system employing a strobe switch between a memory sense line and a sense amplifier.

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Strobe Switch

Signal to noise discrimination in a magnetic core memory sensing system is improved by gating or strobing the output only during the periods when an information signal is expected to appear. This is usually accomplished by gating devices provided at the output of the sense amplifier. This circuit is an improved system employing a strobe switch between a memory sense line and a sense amplifier.

Information and noise signals appearing on the sense line S of the memory matrix, which may be, for example, one plane of a conventional three- dimensional core memory, are applied to the primary Wp of step up transformer
T. The secondary Ws is center tapped to ground through transistor Tx and its opposite ends are connected through diodes D1 and D2 to the input of the sense amplifier.

The transistor Tx is normally held non-conductive so that the center tap of Ws is not grounded. With the center tap disconnected, D1 and D2 prevent current flow in either direction in Ws and it appears as an open circuit. During the strobing interval, a negative pulse is applied to the base of Tx to render it conductive, thus, reconnecting the center tap to ground. With the center-tap grounded, Ws operates as a full wave rectifier to transmit signals of either polarity from line S to the sense amplifier.

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