DRAM memory cell having a vertical bipolar injector
First Claim
1. A memory cell comprising:
- a horizontal FET transistor having a source connected to a source line, a drain connected to a bit line and a floating body between the source and the drain; and
an injector that can be controlled to inject a charge into the floating body of the FET transistor, the injector comprising a bipolar transistor having an emitter connected to an injection line, a base and a collector formed by the floating body of the FET transistor, with the injection line running below the surface of the memory cell;
wherein the emitter of the bipolar transistor is arranged so that the emitter/source assembly forms a vertical stack, the source of the FET transistor serving as the base for the bipolar transistor.
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Accused Products
Abstract
The invention relates to a memory cell having an FET transistor with a source, a drain and a floating body between the source and the drain, and an injector that can be controlled to inject a charge into the floating body of the FET transistor. The injector includes a bipolar transistor having an emitter, a base and a collector formed by the body of the FET transistor. Specifically, in the memory cell, the emitter of the bipolar transistor is arranged so that the source of the FET transistor serves as the base for the bipolar transistor. The invention also includes a memory array comprising a plurality of memory cells according to the first aspect of the invention, and to methods of controlling such memory cells.
114 Citations
20 Claims
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1. A memory cell comprising:
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a horizontal FET transistor having a source connected to a source line, a drain connected to a bit line and a floating body between the source and the drain; and an injector that can be controlled to inject a charge into the floating body of the FET transistor, the injector comprising a bipolar transistor having an emitter connected to an injection line, a base and a collector formed by the floating body of the FET transistor, with the injection line running below the surface of the memory cell; wherein the emitter of the bipolar transistor is arranged so that the emitter/source assembly forms a vertical stack, the source of the FET transistor serving as the base for the bipolar transistor. - View Dependent Claims (2, 5, 8, 10, 11, 12, 13, 15, 16, 18, 19)
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3. A memory cell comprising:
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a horizontal FET transistor having a source connected to a source line, a drain connected to a bit line and a floating body between the source and the drain; and an injector that can be controlled to inject a charge into the floating body of the FET transistor, the injector comprising a bipolar transistor having an emitter connected to an injection line, a base and a collector formed by the floating body of the FET transistor; wherein the emitter of the bipolar transistor is arranged in a bottom region of the source so that the emitter/source assembly forms a vertical stack, the source of the FET transistor serving as the base for the bipolar transistor. - View Dependent Claims (4)
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6. A memory cell comprising:
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a horizontal FET transistor having a source connected to a source line, a drain connected to a bit line and a floating body between the source and the drain; and an injector that can be controlled to inject a charge into the floating body of the FET transistor, the injector comprising a bipolar transistor having an emitter connected to an injection line, a base and a collector formed by the floating body of the FET transistor; wherein the emitter of the bipolar transistor is arranged in a top region of the source so that the emitter/source assembly forms a vertical stack, the source of the FET transistor serving as the base for the bipolar transistor, and wherein the source comprises a lightly doped top region and a strongly doped bottom region arranged below the top region, and in which the emitter is integrated in the top region. - View Dependent Claims (7)
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9. A memory cell comprising:
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a horizontal FET transistor having a source connected to a source line, a drain connected to a bit line and a floating body between the source and the drain; and an injector that can be controlled to inject a charge into the floating body of the FET transistor, the injector comprising a bipolar transistor having an emitter connected to an injection line, a base and a collector formed by the floating body of the FET transistor; wherein the emitter of the bipolar transistor is arranged below a buried insulating layer and is linked to the source via a connecting passage extending through the insulating layer so that the emitter/source assembly forms a vertical stack, the source of the FET transistor serving as the base for the bipolar transistor. - View Dependent Claims (20)
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14. A memory cell comprising:
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a FET transistor having a source, a drain and a floating body between the source and the drain; and an injector that can be controlled to inject a charge into the floating body of the FET transistor, the injector comprising a bipolar transistor having an emitter, a base and a collector formed by the floating body of the FET transistor, wherein the emitter is connected to an injection line that runs below the surface of the memory cell. - View Dependent Claims (17)
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Specification