Sense amplifier with offset cancellation and charge-share...

Details Sense amplifier with offset cancellation and charge-share... Sense amplifier with offset cancellation and charge-share...

2006-09-26

2006-09-26

Ton, My-Trang Nu (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

Reexamination Certificate

active

07113004

ABSTRACT:
A sense amplifier adapted to sense an input signal on global bitlines, having an amplifier offset cancellation network and an offset equalization network. The amplifier offset cancellation network mitigates an inherent offset signal value, a dynamic offset signal value, or both, yet produces a residual offset signal value, which is substantially eliminated by the offset equalization network. The sense amplifier also can include an isolation circuit to isolate the sense amplifier from the corresponding global bitlines when the sense amplifier is unused. Also, a charge-sharing circuit is used to share charge between the bitlines when the sense amplifier is activated, thus producing a limited voltage swing on the bit lines. The sense amplifier uses an amplifier offset cancellation network having multiple precharge-and-balance transistors, and an offset equalization network having at least one balancing transistor. Furthermore, the charge-sharing circuit includes a precharging circuit, and a charge reservoir, which selectively sources and sinks charge when the sense amplifier is used. The sense amplifier is a latch-type differential sense amplifier.

REFERENCES:
patent: 3656003 (1972-04-01), Chen et al.
patent: 4843264 (1989-06-01), Galbraith
patent: 5953259 (1999-09-01), Yoon et al.

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