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Circuit for Forced Recovery of Capacitive Memory Word Lines

IP.com Disclosure Number: IPCOM000091277D
Original Publication Date: 1967-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Andersen, SR: AUTHOR [+2]

Abstract

Word lines 10 of this capacitive read-only memory are recovered by charging them through transistor T1 and diodes D1...DN. Word read-out in a capacitive read-only storage device is accomplished by discharging capacitors 12 coupling the particular drive line 10 to the sense lines 14. After this discharge, it is necessary to allow capacitors 12 to recover before the drive line 10 can be driven again. To recharge the capacitors, the base of T1 is pulsed positively after each memory drive cycle. This causes a positive pulse on the anode of each of diode D1... DN joining the drive lines 10 to T1. If a particular drive line 10 is driven on a previous cycle, the cathode of the diode joining it to T1 is low. Therefore capacitors 12 are charged by current flowing through T1 and the particular diode.

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Circuit for Forced Recovery of Capacitive Memory Word Lines

Word lines 10 of this capacitive read-only memory are recovered by charging them through transistor T1 and diodes D1...DN. Word read-out in a capacitive read-only storage device is accomplished by discharging capacitors 12 coupling the particular drive line 10 to the sense lines 14. After this discharge, it is necessary to allow capacitors 12 to recover before the drive line 10 can be driven again. To recharge the capacitors, the base of T1 is pulsed positively after each memory drive cycle. This causes a positive pulse on the anode of each of diode D1... DN joining the drive lines 10 to T1. If a particular drive line 10 is driven on a previous cycle, the cathode of the diode joining it to T1 is low. Therefore capacitors 12 are charged by current flowing through T1 and the particular diode. Once the word line is recovered, T1 is again biased nonconductive so that the diodes now become backbiased by source -V2 and the words are conditioned for the next readout.

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