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Well isolation type anti-SEU multi-node overturning storage unit layout structure

A storage unit and layout structure technology, applied in electrical components, transistors, electric solid-state devices, etc., can solve the problems of ordinary DICE storage unit flipping, improve anti-SEU performance, reduce the probability of multi-node flipping, and increase the distance Effect

Active Publication Date: 2016-05-25
BEIJING MXTRONICS CORP +1
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Problems solved by technology

[0005] The technical problem solved by the present invention is to overcome the problem that common DICE storage units in the ultra-deep sub-micron process will cause multiple storage nodes in the unit to flip under the influence of SEU, and eventually lead to the flipping of common DICE storage cells

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  • Well isolation type anti-SEU multi-node overturning storage unit layout structure

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Embodiment Construction

[0026] The invention overcomes the disadvantage that common DICE memory cells in the ultra-deep sub-micron process will cause multiple storage nodes in the unit to flip under the influence of SEU, and eventually lead to the flipping of common DICE memory cells, and proposes a new well-isolated anti-corrosion The SEU multi-node flip memory cell layout structure can effectively separate all sensitive node pairs in the common DICE memory cell structure and increase the distance between sensitive node pairs. Among them, for PMOS transistors, N-well isolation can effectively stabilize the N-well voltage. Reduces the chance of flipping multiple storage nodes due to parasitic bipolar transistor effects. For NMOS transistors, the N-well isolation effectively shunts the holes generated by incoming particles, reducing the occurrence of multiple storage nodes due to charge sharing effects. The probability of flipping, thereby suppressing the multi-node flipping caused by SEU in the DICE u...

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Abstract

The invention relates to a well isolation type anti-SEU multi-node overturning storage unit layout structure. The well isolation type anti-SEU multi-node overturning storage unit layout structure comprises well isolation areas (201), (202), (203), DICE unit areas (101), (103), (105), (107) and DICE units (102), (104), (106), (108). The well isolation areas are arranged between two DICE unit areas in a crossed manner. According to the well isolation type anti-SEU multi-node overturning storage unit layout structure, compared with the prior art, the distance between sensitive node pairs is further increased while all the sensitive node pairs in a DICE storage unit structure are effectively separated; and the well isolation structure is also beneficial for reducing the parasitic bipolar transistor effect and charge sharing effect between the sensitive node pairs, so that multi-node overturning caused by SEU in the DICE units is greatly inhibited, and the anti-SEU performance of anti-radiation SRAM is greatly improved.

Description

technical field [0001] The invention relates to the technical field of memory cells, in particular to a layout structure of a well-isolated anti-SEU multi-node flip memory cell. Background technique [0002] The single event flip effect refers to the radiation produced by high-energy protons or high-energy neutrons hitting the atomic nucleus and the heavy nuclear particles in cosmic rays, which generate high-density charges, which cause the state change of the internal nodes of the storage unit, thereby causing the storage data of the storage unit to flip , this effect is the result of the action of a single particle, commonly known as the Single Event Upset Effect (SEU). [0003] For SRAM, according to the single event effect analysis, the most sensitive place to single event is the memory unit body, because once a single event hits any sensitive node in the memory body, the storage state can be changed. In a traditional CMOSSRAM memory cell, the nodes that store informati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L27/11H10B10/00
CPCH10B10/12
Inventor 赵元富刘皓陆时进刘琳岳素格李鹏张晓晨李阳
Owner BEIJING MXTRONICS CORP
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