Compact semiconductor memory device having reduced number of contacts, methods of operating and methods of making
First Claim
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1. A semiconductor memory device comprising:
- a plurality of semiconductor memory cells connected in series, wherein at least two of said memory cells each include;
a floating body region configured to store data as charge therein to define a state of said memory cell selected from at least first and second states, wherein current flow through said memory cell is larger when said memory cell is in one of said first and second states than when said memory cell is in the other of said first and second states; and
a back-bias region configured to inject charge into or extract charge out of said floating body region to maintain said state of said memory cell.
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Abstract
An integrated circuit including a link or string of semiconductor memory cells, wherein each memory cell includes a floating body region for storing data. The link or string includes at least one contact configured to electrically connect the memory cells to at least one control line, and the number of contacts in the string or link is the same as or less than the number of memory cells in the string or link.
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Citations
20 Claims
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1. A semiconductor memory device comprising:
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a plurality of semiconductor memory cells connected in series, wherein at least two of said memory cells each include; a floating body region configured to store data as charge therein to define a state of said memory cell selected from at least first and second states, wherein current flow through said memory cell is larger when said memory cell is in one of said first and second states than when said memory cell is in the other of said first and second states; and a back-bias region configured to inject charge into or extract charge out of said floating body region to maintain said state of said memory cell. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A semiconductor memory device comprising:
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a plurality of semiconductor memory cells connected in series, wherein at least two of said memory cells each include; a floating body region configured to store data as charge therein; a first region in electrical contact with said floating body region; a second region in electrical contact with said floating body region and spaced apart from said first region; a gate positioned between said first and second regions; and a back-bias region; wherein said back-bias region is configured to establish at least two different stable floating body charge levels by application of voltage to said back-bias region; wherein current flow through said memory cell is larger when said memory cell is in one of said at least two different stable floating body charge levels than when said memory cell is in the other of said at least two different stable floating body charge levels. - View Dependent Claims (9, 10, 11, 12)
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13. A semiconductor memory device comprising:
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a plurality of semiconductor memory cells connected in series, wherein at least two of said memory cells each include; a floating body region configured to store data as charge therein to define a state of said memory cell selected from at least first and second states; wherein current flow through said memory cell is larger when said memory cell is in one of said first and second states than when said memory cell is in the other of said first and second states a first region in electrical contact with said floating body region; a second region in electrical contact with said floating body region and spaced apart from said first region; a gate positioned between said first and second regions; and a back-bias region commonly connected to said at least two of said memory cells. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification