Browse Prior Art Database

Array Line Driver Reference System

IP.com Disclosure Number: IPCOM000060922D
Original Publication Date: 1986-Jun-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Houghton, RJ: AUTHOR

Abstract

A push-pull driver circuit provides high current drive for both select and deselect to achieve high data rate in an unclocked memory system. In applying this reference system, the emitters of the NPN pull-down devices of each word line driver are connected to a common node voltage Vref driven by a current source. The unselected word bottom nodes WB are referenced with respect to the chip high voltage source VH. This reference system is insensitive to supply voltage tolerances and permits wide choice of decoders. In the figure, the push-pull driver circuit 10 is connected between VH and a node Vref common to a plurality N of driver circuits. The node Vref is fed by a constant current source equal to N times the unselect current I0 of an individual driver. The resulting Vref voltage tracks with VH, i.e., Vref = VH - V0 - 2.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Array Line Driver Reference System

A push-pull driver circuit provides high current drive for both select and deselect to achieve high data rate in an unclocked memory system. In applying this reference system, the emitters of the NPN pull-down devices of each word line driver are connected to a common node voltage Vref driven by a current source. The unselected word bottom nodes WB are referenced with respect to the chip high voltage source VH. This reference system is insensitive to supply voltage tolerances and permits wide choice of decoders. In the figure, the push-pull driver circuit 10 is connected between VH and a node Vref common to a plurality N of driver circuits. The node Vref is fed by a constant current source equal to N times the unselect current I0 of an individual driver. The resulting Vref voltage tracks with VH, i.e., Vref = VH - V0 - 2.5 Vbe, where V0 is a DC potential source and Vbe is a base-emitter voltage. The word top WT and the word bottom WB voltage levels are determined by V0 and the internal voltage drops of the driver. V0 may be selected to meet cell requirements. During switching of the driver the transient current i(t) is absorbed by the current source N(I0). The peak value of this current is typically much less than the current source N(I0). Therefore, Vref is essentially unchanged during switching of the driver.

1

Page 2 of 2

2

[This page contains 3 pictures or other non-text objects]