Power saving sense amplifier that mimics non-toggling bitline st

Details Power saving sense amplifier that mimics non-toggling bitline st Power saving sense amplifier that mimics non-toggling bitline st

1995-03-03

1996-06-04

Nelms, David C.

Static information storage and retrieval

Read/write circuit

Flip-flop used for sensing

36518911, 365207, 365208, 365227, 327 51, G11C 706

Patent

active

055240976

ABSTRACT:
A sense amplifier of the present invention provides power savings of between 30% to 70% for typical usage of a programmable logic device. In one embodiment, this sense amplifier includes circuitry for detecting and propagating the logic state on a bit line, an amplifier for amplifying the propagated logic state, and configuration logic for receiving a first configuration bit and a second configuration bit. If the first configuration bit and the second configuration bit have different logic states (indicating a non-toggling state), then the sense amplifier mimics the bit line at either a first logic state or a second logic state. Specifically, if the first configuration bit has the first logic state and the second configuration bit has the second logic state, then the sense amplifier mimics the bit line at the first logic state. However, if the first configuration bit has the second logic state and the second configuration bit has the first logic state, then the sense amplifier mimics the bit line at the second logic state. The sense amplifier of the present invention in its non-toggling states prevents the formation of a current branch, thereby eliminating undesirable power consumption. In contrast, if the first and second configuration bits have the same logic state (indicating a toggling state), then the sense amplifier toggles based on the change in voltage on the bit line.

REFERENCES:
patent: 5017815 (1991-05-01), Shah et al.
patent: 5030859 (1991-07-01), Ihara
patent: 5189322 (1993-02-01), Chan et al.

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