DRAM cell with enhanced SER immunity
First Claim
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1. A memory coil formed on a substrate, comprising:
- first and second fully depleted transfer devices each having a body region and first and second diffused electrodes, wherein said first diffused electrode of said first transfer device, said body region of said first transfer device, said second diffused electrode of said first transfer device, and a portion of said first node of said differential storage capacitor are all disposed in sequence on a first rail of semiconductor material and a single differential storage capacitor having two nodes abutting and in electrical contact with said first diffused electrodes of each of said transfer devices, said storage capacitor having a primary capacitance and a plurality of inherent capacitances, wherein said primary capacitance has a capacitive value that is at least five times greater than that of said plurality of inherent capacitances which substantially reduces differential charge loss.
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Abstract
A memory cell that has first and second fully depleted transfer devices each having a body region and first and second diffused electrodes. The cell has a differential storage capacitor having at least one node abutting and in electrical contact with one of the first and second diffused electrodes of each of the transfer devices. The storage capacitor has a primary capacitance and a plurality of inherent capacitances, wherein the primary capacitance has a capaictive value that is at least approximately five times greater than that of the plurality of inherent capacitances.
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15 Claims
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1. A memory coil formed on a substrate, comprising:
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first and second fully depleted transfer devices each having a body region and first and second diffused electrodes, wherein said first diffused electrode of said first transfer device, said body region of said first transfer device, said second diffused electrode of said first transfer device, and a portion of said first node of said differential storage capacitor are all disposed in sequence on a first rail of semiconductor material and a single differential storage capacitor having two nodes abutting and in electrical contact with said first diffused electrodes of each of said transfer devices, said storage capacitor having a primary capacitance and a plurality of inherent capacitances, wherein said primary capacitance has a capacitive value that is at least five times greater than that of said plurality of inherent capacitances which substantially reduces differential charge loss. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A differential DRAM cell, comprising a plurality of rails of semiconductor material formed on a semiconductor substrate, each rail having source and drain diffusions therein separated by respective fully depleted channel regions that are controlled by a gate electrode to form a transistor, each of said drain diffusions being coupled to a first node of a differential capacitor disposed on adjacent ones of said plurality of rails, at least one of said adjacent ones of said plurality of rails having a storage dielectric disposed on said first node, and a plate electrode of said differential capacitor being disposed on said storage dielectric which substantially reduces differential charge loss.
Specification