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Browse Prior Art Database

Monolithic Memory Array Selection

IP.com Disclosure Number: IPCOM000077213D
Original Publication Date: 1972-Jun-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Tsui, F: AUTHOR

Abstract

The proposed driving arrangement for word selection in a storage cell matrix is shown schematically in the drawing. A switch Si is provided for each word line Wi (i = 1,2...N). N switches share a common series resistance Rs which leads to voltage source V+. A diode Di is provided. for each word line Wi. The cathodes of the diodes are connected in parallel and to a pulsed voltage generator G.

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Monolithic Memory Array Selection

The proposed driving arrangement for word selection in a storage cell matrix is shown schematically in the drawing. A switch Si is provided for each word line Wi (i = 1,2...N). N switches share a common series resistance Rs which leads to voltage source V+. A diode Di is provided. for each word line Wi. The cathodes of the diodes are connected in parallel and to a pulsed voltage generator G.

During stand-by, all switches S1...SN are closed and pulsed generator G has a quiescent voltage VO at its output. The current shared by all cells in the array is determined by (V+ -VQ) divided by the sum of Rs and the combined resistances of the switches, cells and diodes. Points Wi' have a potential equal to (VQ + VDi), where VDi is the voltage drop across a diode, and points Wi have a potential equal to (VQ + VDi + VCell), where VCell is the column-average voltage drop across a cell.

For selection, all switches are opened, except the one connected to the word line being selected. At the same time, pulsed generator G raises its output voltage from VQ to VP. Opening of all switches for the unselected word lines causes a reduction in the current through Rs (since the powered-up current increase in the cell column selected is usually designed to be less than the sum of stand-by currents through (N-1) columns), so that the potential of point W of the word line selected rises, because this line is connected to Rs by the only switch that remains c...