3-D column select circuit layout in semiconductor memory devices
First Claim
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1. A column select circuit in a Static Random Access Memory (SRAM) having a three-dimensional layout, the column select circuit comprising:
- a lower CMOS layer in a substrate;
an upper NMOS layer above the lower layer; and
an intermediate PMOS layer between the upper NMOS layer and the lower CMOS layer.
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Abstract
A column select circuit in a Static Random Access Memory (SRAM) having a three-dimensional layout can include a lower CMOS layer in a substrate and an upper NMOS layer above the lower layer. An intermediate PMOS layer is located between the upper NMOS layer and the lower CMOS layer.
15 Citations
30 Claims
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1. A column select circuit in a Static Random Access Memory (SRAM) having a three-dimensional layout, the column select circuit comprising:
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a lower CMOS layer in a substrate; an upper NMOS layer above the lower layer; and an intermediate PMOS layer between the upper NMOS layer and the lower CMOS layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A column path circuit layout in a semiconductor memory device, the semiconductor memory device comprising a column path circuit for enabling one of a plurality of partial bit lines to be operatively connected to one global bit line, the column path circuit layout comprising:
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a metal oxide semiconductor (MOS) layer as a first layer formed in a substrate; a second layer over the MOS layer for forming precharge transistors; and a third layer for forming path switching transistors, the third layer being divided and formed over the second layer other than a region through which a contact of a power line for supplying a power to the second layer passes. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A column path circuit layout in a semiconductor memory device, wherein:
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when first and second P-type metal oxide semiconductor (MOS) transistors and first and second N-type MOS transistors constitute part of the column path circuit, the first and second P-type MOS transistors having sources connected to a power supply voltage in parallel, drains connected to first and second corresponding partial bit lines, respectively, and gates for receiving first and second column select signals, respectively, and the first and second N-type MOS transistors having drains and gates connected to the corresponding drains and gates of the first and second P-type MOS transistors, respectively, and sources connected to a global bit line in common, the first and second P-type MOS transistors have active regions formed as a first silicon layer which is formed over an MOS layer, the first and second N-type MOS transistors have active regions formed as a second silicon layer which is formed over the first silicon layer, and the second silicon layer is divided into two with a boundary therebetween being a contact region formed for applying the power supply voltage to the first silicon layer. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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28. A column path circuit layout in a semiconductor memory device, wherein:
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when part of the column path circuit is configured by laminating and laying out first and second metal oxide semiconductor (MOS) transistors of a first conduction type and first and second MOS transistors of a second conduction type on different conductive substrate layers, the first and second MOS transistors having sources connected to a power supply voltage in parallel, drains connected to first and second corresponding partial bit lines, respectively, and gates for receiving first and second column select signals, respectively, and the first and second MOS transistors having drains and gates connected to the corresponding drains and gates of the first and second MOS transistors of the first conduction type, respectively, and sources connected to a global bit line in common, the first and second MOS transistors of the first conductive type share one active region which is formed on the first conductive substrate layer while the first and second MOS transistors of the second conductive type are laid out in divided active regions of the second conductive substrate layer, respectively, with a boundary therebetween being a contact region for power feed. - View Dependent Claims (29, 30)
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Specification