Memory array incorporating noise detection line
First Claim
1. An integrated circuit, comprising:
- a multi-level memory array of memory cells having at least one layer of word lines and more than one layer of bit lines, each layer of bit lines includes a bit line group;
at least one noise detection line associated with each layer of bit lines;
a selection circuit that selects a selected bit line associated with a particular bit line group, and a selected noise detection line associated with said particular bit line group; and
a bit line sensing circuit, said bit line sensing circuit senses a signal on said selected bit line and a signal on said selected noise detection line, said bit line sensing circuit includes a voltage sensing circuit;
said voltage sensing circuit includes a first precharge circuit for precharging said selected noise detection line to an unselected word line bias voltage; and
a second precharge circuit for precharging said selected bit line to a voltage other than the unselected word line bias voltage.
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Accused Products
Abstract
A memory array includes a sensing circuit for sensing bit line current while keeping the voltage of the selected bit line substantially unchanged. The word lines and bit lines are biased so that essentially no bias voltage is impressed across half-selected memory cells, which substantially eliminates leakage current through half-selected memory cells. The bit line current which is sensed arises largely from only the current through the selected memory cell. A noise detection line in the memory array reduces the effect of coupling from unselected word lines to the selected bit line. In a preferred embodiment, a three-dimensional memory array having a plurality of rail-stacks forming bit lines on more than one layer, includes at least one noise detection line associated with each layer of bit lines. A sensing circuit is connected to a selected bit line and to its associated noise detection line.
58 Citations
22 Claims
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1. An integrated circuit, comprising:
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a multi-level memory array of memory cells having at least one layer of word lines and more than one layer of bit lines, each layer of bit lines includes a bit line group; at least one noise detection line associated with each layer of bit lines; a selection circuit that selects a selected bit line associated with a particular bit line group, and a selected noise detection line associated with said particular bit line group; and a bit line sensing circuit, said bit line sensing circuit senses a signal on said selected bit line and a signal on said selected noise detection line, said bit line sensing circuit includes a voltage sensing circuit; said voltage sensing circuit includes a first precharge circuit for precharging said selected noise detection line to an unselected word line bias voltage; and a second precharge circuit for precharging said selected bit line to a voltage other than the unselected word line bias voltage. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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2. An integrated circuit, comprising:
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a multi-level memory array of memory cells having at least one layer of word lines and more than one layer of bit lines, each layer of bit lines includes a bit line group; at least one noise detection line associated with each layer of bit lines; a selection circuit that selects a selected bit line associated with a particular bit line group, and a selected noise detection line associated with said particular bit line group; and a bit line sensing circuit, said bit line sensing circuit senses a signal on said selected bit line and a signal on said selected noise detection line; wherein alternating bit lines on a bit line layer form a first group and are associated with a selection circuit and sensing circuit disposed to one side of the array, and remaining bit lines on the layer form a second group and are associated with a selection circuit and sensing circuit disposed to a side of the array opposite the one side. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification