Single ended dynamic sense amplifier

Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude

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Details

327 55, 327309, H03K 19094, G11C 706

Patent

active

056191499

ABSTRACT:
A single-ended sense amplifier circuit for sensing the state of a bitline in a memory array. The sense amplifier includes an output circuit having an input and an output, the output for indicating a state of the bitline in response to a bitline voltage level. A precharge circuit is coupled to the input for charging the input to a first voltage level when the input is decoupled from the bitline. A discharge circuit is coupled between the bitline and the input. In one embodiment, the discharge circuit includes a field effect transistor coupled as a cascode device for coupling and decoupling the input to the bitline. The discharge circuit couples the input to the bitline when the discharge voltage level exceeds a threshold voltage level of the discharge circuit. The sense amplifier circuit also includes a noise margin circuit coupled to the bitline for charging the bitline to a voltage level that is less than the first voltage level such that the discharge voltage level is less than the threshold voltage level by a predetermined noise margin voltage.

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patent: 5268600 (1993-12-01), Yeu
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patent: 5357156 (1994-10-01), Herrington

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