ARCHITECTURE FOR A 3D MEMORY ARRAY
First Claim
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1. An integrated circuit device, comprising:
- a memory array; and
bias circuits that compensate for variations in threshold voltages corresponding to memory states of memory cells in the array by applying different bias conditions to selected bit lines.
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Abstract
Techniques are described herein for compensating for threshold voltage variations among memory cells in an array by applying different bias conditions to selected bit lines. Techniques are also described herein for connecting global bit lines to a variety of levels of memory cells in a 3D array, to provide for minimizing capacitance differences among the global bit lines.
47 Citations
21 Claims
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1. An integrated circuit device, comprising:
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a memory array; and bias circuits that compensate for variations in threshold voltages corresponding to memory states of memory cells in the array by applying different bias conditions to selected bit lines. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An integrated circuit, comprising:
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a plurality of blocks, blocks in the plurality of blocks comprising a plurality of levels L(z), levels L(z) in the plurality of levels including respective two dimensional arrays of memory cells, respective two dimensional arrays including a plurality of local bit lines coupled to corresponding memory cells in the array; a plurality of global bit lines, global bit lines in the plurality of global bit lines including a plurality of connectors, connectors in the plurality of connectors coupled to a given global bit line being coupled to corresponding local bit lines in the plurality of blocks, and wherein the corresponding local bit line in one of the plurality of blocks is on a different level L(z) than the corresponding local bit line in another of the plurality of ii blocks; and switch circuits coupled to the plurality of global bit lines, the switch circuits configured to apply respective bias voltages to corresponding global bit lines depending on the level L(z) of a selected memory cell. - View Dependent Claims (9, 10, 11, 12, 13)
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14. An integrated circuit comprising:
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a memory array including a plurality of levels of memory cells, levels in the plurality of levels including local bit lines and memory cells coupled to the local bit lines; global bit lines coupled to corresponding sets of local bit lines in the array; decoding circuitry to select memory cells in the plurality of levels; and bias circuits coupled to the global bit lines for providing selected bias voltages, and responsive to control signals to select a bias voltage for the global bit line that corresponds to the level of a selected memory cell. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification