Bit line selection transistor layout structure
First Claim
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1. A memory device comprising:
- a bit line;
a first Bit Line Transistor (BLT) coupled to the bit line, the first BLT comprising a channel; and
a second BLT coupled to the bit line, the second BLT comprising a channel, the dimensions of which are different from the dimensions of the first BLT channel, wherein the channel dimensions for the first and second BLTs comprise a channel width, and wherein the channel width for the first BLT is wider than the channel width for the second BLT.
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Abstract
A BLT can include a different channel length, channel width, or both to compensate for bit line loading effects. The channel length and/or channel width of the transistor structure can be configured so as to achieve a desired loading. Thus, the bit line transistor structure can improve global metal bit line loading uniformity and provide greater uniformity in bit line bias. Additionally, the greater uniformity in bit line bias can improve reliability.
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Citations
24 Claims
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1. A memory device comprising:
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a bit line; a first Bit Line Transistor (BLT) coupled to the bit line, the first BLT comprising a channel; and a second BLT coupled to the bit line, the second BLT comprising a channel, the dimensions of which are different from the dimensions of the first BLT channel, wherein the channel dimensions for the first and second BLTs comprise a channel width, and wherein the channel width for the first BLT is wider than the channel width for the second BLT. - View Dependent Claims (2, 3, 4, 5)
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6. A method of designing a memory device comprising:
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determining desired bit line loading; calculating a bit line transistor dimension that will achieve the desired bit line loading; and modifying the bit line transistor dimension based on the calculation. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A method of manufacturing a memory device comprising:
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determining desired bit line loading; calculating a bit line transistor dimension that will achieve the desired bit line loading; modifying the bit line transistor dimension based on the calculation; and manufacturing a memory device comprising a bit line transistor that includes the modified bit line transistor dimension. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A memory device comprising:
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a bit line; a first Bit Line Transistor (BLT) coupled to the bit line, the first BLT comprising a channel; and a second BLT coupled to the bit line, the second BLT comprising a channel, the dimensions of which are different from the dimensions of the first BLT channel, wherein the channel dimensions for the first and second BLTs comprise a channel width and length, and wherein the channel width and length for the first BLT are different than the channel width for the second BLT. - View Dependent Claims (21, 22, 23, 24)
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Specification