Stacked semiconductor memory
First Claim
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1. A semiconductor memory comprising:
- a first transistor for writing, said first transistor having a gate electrode, and source and drain regions;
a second transistor for amplifying, said second transistor having a gate electrode, and source and drain regions; and
a third transistor for reading, said third transistor having a gate electrode, and source and drain regions,wherein said drain or source of said first transistor is connected to said gate electrode of said second transistor,wherein said drain or source of said second transistor is connected to said source or drain of said third transistor, andwherein at least a part of said first transistor is stacked on said third transistor in such a manner that an insulating film is formed on said gate electrode of said third transistor and said first transistor is stacked over said insulating layer.
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Abstract
In a 3-transistor random access memory for dynamic operation, the invention discloses a structure in which one of the transistors is stacked on the other transistor. A transistor for writing is disposed on a transistor for reading, and one of its terminals is used in common with the gate electrode of a transistor for judging data. The other terminal is connected to one of the terminals of the transistor for reading.
A memory cell capable of extremely large scale integration can be obtained.
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Citations
10 Claims
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1. A semiconductor memory comprising:
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a first transistor for writing, said first transistor having a gate electrode, and source and drain regions; a second transistor for amplifying, said second transistor having a gate electrode, and source and drain regions; and a third transistor for reading, said third transistor having a gate electrode, and source and drain regions, wherein said drain or source of said first transistor is connected to said gate electrode of said second transistor, wherein said drain or source of said second transistor is connected to said source or drain of said third transistor, and wherein at least a part of said first transistor is stacked on said third transistor in such a manner that an insulating film is formed on said gate electrode of said third transistor and said first transistor is stacked over said insulating layer. - View Dependent Claims (2, 3, 4, 5)
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6. A semiconductor memory including:
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a semiconductor substrate; a first region used as a source region or a drain region, a second region used as a drain region and a source region, and a third region used as a drain region or a source region on one major surface of said substrate; a first insulating film formed on said surface of said substrate between at least said first and second regions; a first electrode formed on said first insulating film; a second insulating film formed on said surface of said substrate between at least said second region and said third region; a second electrode formed on said second insulating film; a third insulating film formed on said first electrode and extending from an area above said first region to an area above said second region; a semiconductor layer formed over said third insulating film, one edge of said semiconductor layer electrically being connected to said first region and the other edge of said semiconductor layer electrically being connected to said second electrode; a fourth insulating film formed on a part of said semiconductor layer; and a third electrode formed on said fourth insulating film. - View Dependent Claims (7, 8, 9, 10)
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Specification