P-channel sense amplifier pull-up circuit incorporating a voltag

Details P-channel sense amplifier pull-up circuit incorporating a voltag P-channel sense amplifier pull-up circuit incorporating a voltag

1993-06-09

1994-11-22

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

36518911, 327 77, 327530, G11C 706

Patent

active

053672135

ABSTRACT:
This invention is an improved pull-up circuit for P-channel sense amplifiers in dynamic random access memory arrays having non-bootstrapped wordlines. The improved pull-up circuit features a voltage-comparator-controlled P-channel device which couples the power supply bus to a pull-up node for high current flow to the node and to digit lines which are coupled to the node via P-channel isolation devices. During the pull-up cycle, the P-channel device remains "on" as long as a reference voltage is greater than a variable voltage which represents the voltage level on portions of the digit lines farthest from the P-channel sense amplifier. The pull-up circuit also has an N-channel device which couples the power supply node to the pull-up node for maintenance of a desired voltage level equal to V.sub.cc minus the threshold voltage of the N-channel device.

REFERENCES:
patent: 4723225 (1988-02-01), Kaszubinski et al.
patent: 5122986 (1992-06-01), Lim
patent: 5175451 (1992-12-01), Ihara
patent: 5250854 (1993-10-01), Lien
patent: 5253201 (1993-10-01), Atsumi et al.

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