Active sense amplifier with dynamic pre-charge transistor

Details Active sense amplifier with dynamic pre-charge transistor Active sense amplifier with dynamic pre-charge transistor

1990-05-29

1991-10-08

Clawson, Jr., Joseph E.

Static information storage and retrieval

Read/write circuit

Differential sensing

365203, 307530, G11C 11409

Patent

active

050560638

ABSTRACT:
A sense amplifier including a pair of P-conductivity-type current-mirror transistors, a N-conductivity-type reference transistor and a cascode-connected N-conductivity-type transistor and inverter connected according to prior-art. The amplifier also includes a N-conductivity-type pre-charge transistor with source-drain path connected in parallel with the source-drain path of P-conductivity-type mirror load transistor. The gate of the pre-charge transistor is connected to the gate of the N-conductivity-type cascode transistor, which is also connected to the output of cascode inverter.
The pre-charge transistor functions to bypass the mirror load transistor when a discharged bitline is selected. As a result, the current charging the bitline capacitance is increased and the time needed for charging is decreased. As an additional benefit, the bitline-charging current through the pre-charge transistor bypasses the current mirror load transistor, greatly diminishing the probability of a read error being mirrored to the output of sense amplifier.

REFERENCES:
patent: 4567387 (1986-01-01), Wacyk
patent: 4742253 (1988-05-01), Giebel
patent: 4788460 (1988-11-01), Kobatake
patent: 4800297 (1989-01-01), Novosel et al.
patent: 4962482 (1990-10-01), Jinbo

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