Sense amplifier and related method
First Claim
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1. A device comprising:
- a first current mirror electrically connected to a reference current source of a memory array;
a second current mirror electrically connected to a cell current source of the memory array, wherein the first current mirror and the second current mirror have an equivalent structure;
a first inverter having;
a first input terminal electrically connected to the first current mirror; and
a first output terminal; and
a second inverter having;
a second input terminal electrically connected to the second current mirror and the first output terminal; and
a second output terminal electrically connected to the first current mirror and the first input terminal;
a first clamp transistor directly connected to the first current mirror and a first select transistor;
a second clamp transistor electrically connected to the second current mirror and a second select transistor;
the first select transistor directly connected to the first clamp transistor and the reference current source; and
a second select transistor electrically connected to the second clamp transistor and the cell current source.
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Abstract
A device includes first and second current mirrors electrically connected to reference and cell current sources of a memory array. A first inverter is electrically connected to the first current mirror, and a second inverter is electrically connected to the second current mirror. The first and second inverters are cross-coupled.
8 Citations
20 Claims
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1. A device comprising:
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a first current mirror electrically connected to a reference current source of a memory array; a second current mirror electrically connected to a cell current source of the memory array, wherein the first current mirror and the second current mirror have an equivalent structure; a first inverter having; a first input terminal electrically connected to the first current mirror; and a first output terminal; and a second inverter having; a second input terminal electrically connected to the second current mirror and the first output terminal; and a second output terminal electrically connected to the first current mirror and the first input terminal; a first clamp transistor directly connected to the first current mirror and a first select transistor; a second clamp transistor electrically connected to the second current mirror and a second select transistor; the first select transistor directly connected to the first clamp transistor and the reference current source; and a second select transistor electrically connected to the second clamp transistor and the cell current source. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device comprising:
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at least two sense amplifier blocks, each sense amplifier block including; a first multiplexer having at least two inputs electrically connected to first bit cells of a memory array; a second multiplexer having at least two inputs electrically connected to second bit cells of the memory array, the second multiplexer being physically disconnected from the first multiplexer; a reference current source having; a first reference line electrically connected to a first reference bit cell; and a second reference line electrically connected to a second reference bit cell; a first sense amplifier having a first input electrically connected to an output of the first multiplexer, and a second input electrically connected to a first output terminal of the reference current source; and a second sense amplifier having a first input electrically connected to an output of the second multiplexer, and a second input electrically connected to a second output terminal of the reference current source; and at least one switch configured to merge reference currents supplied through the first and second reference lines of the at least two sense amplifier blocks, wherein the merged reference currents continuously pass along a same conductive path, the conductive path extending to each of the at least two sense amplifier blocks. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method comprising:
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(a) receiving a reference current; (b) mirroring the reference current to generate a mirrored reference current; (c) receiving a cell current; (d) mirroring the cell current to generate a mirrored cell current; (e) receiving a first sense amplifier enable signal from a controller by a first transistor and a second transistor of a sense amplifier, a drain electrode of the first transistor being directly connected to a current mirror that mirrors the cell current and a drain electrode of the second transistor being directly connected to a current mirror that mirrors the reference current, the first sense amplifier enable signal having a voltage that is sufficiently high to turn off the first transistor and the second transistor; (f) charging a first input node of the sense amplifier to a first voltage by the mirrored reference current; (g) charging a second input node of the sense amplifier to a second voltage by the mirrored cell current; (h) receiving a second sense amplifier enable signal by the first transistor and the second transistor of the sense amplifier, the second sense amplifier enable signal having a voltage that is sufficiently low to turn on the first transistor and the second transistor; and (i) latching the first and second voltages. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification