Drive signal generating circuit for sense amplifier

Details Drive signal generating circuit for sense amplifier Drive signal generating circuit for sense amplifier

1995-12-28

1998-07-07

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 73, 327563, H03K 524

Patent

active

057774935

ABSTRACT:
A drive signal generating circuit for a sense amplifier compatible with a semiconductor memory device by driving a sense amplifier using both voltage applied from the outside and voltage outputted from a voltage generator. In a conventional circuit, when operating voltage of a sense amplifier is lowered, it is difficult to operate the sense amplifier in high speed as efficiency is lowered. Further, when only using output voltage outputted from the voltage generator, refresh characteristic of the memory cell is lowered because load is great and the sense amplifier is unstably operated in initial sensing state. To overcome the above problems, according to the invention, a drive signal generating circuit for a sense amplifier drives pull-up transistors by using both voltage applied from the outside and voltage outputted from a voltage generator, and enhances the refresh characteristic of the memory cell, thereby preventing decrease of sensing speed, lowering of data restoration level of the memory cell, and lowering of the refresh characteristic appeared when the sense amplifier is driven only by voltage outputted from the voltage generator.

REFERENCES:
patent: 4697112 (1987-09-01), Ohtani et al.
patent: 5192878 (1993-03-01), Miyamoto et al.
patent: 5544110 (1996-08-01), Yuh
"Circuit Technique for Optimizing Access Time in Static Random Access Memories", IBM Technical Disclosure Bulletin, vol. 38, No. 5, pp. 483-488, May 1995.

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