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1TnC memory bit-cell having stacked and folded planar capacitors with lateral offset

專利號
US11997853B1
公開日期
2024-05-28
申請人
Kepler Computing Inc.(US CA San Francisco)
發(fā)明人
Rajeev Kumar Dokania; Amrita Mathuriya; Debo Olaosebikan; Tanay Gosavi; Noriyuki Sato; Sasikanth Manipatruni
IPC分類
H10B53/30
技術(shù)領(lǐng)域
capacitors,capacitor,bit,in,electrode,node,layer,some,memory,wherein
地域: CA CA San Francisco

摘要

A configuration for efficiently placing a group of capacitors with one terminal connected to a common node is described. The capacitors are stacked and folded along the common node. In a stack and fold configuration, devices are stacked vertically (directly or with a horizontal offset) with one terminal of the devices being shared to a common node, and further the capacitors are placed along both sides of the common node. The common node is a point of fold. In one example, the devices are capacitors. N number of capacitors can be divided in L number of stack layers such that there are N/L capacitors in each stacked layer. The N/L capacitors are shorted together with an electrode (e.g., bottom electrode). The electrode can be metal, a conducting oxide, or a combination of a conducting oxide and a barrier material. The capacitors can be planar, non-planar or replaced by memory elements.

說明書

FIG. 9E illustrates timing diagram 950 for read operation for 1T1C bit-cells with the PL parallel to the BL and where the word-lines (WLPs) for switch transistors for multiple plate-lines within a bit-cell are driven by a same signal, in accordance with some embodiments. In some embodiments, read operation begins by asserting the selected WL. In some embodiments, the selected WL is boosted for read operation. WL is boosted above Vdd to Vdd+Vboost level. In some embodiments, a writeback scheme is implemented after the read operation to restore the data value stored in the selected bit-cell due to the destructive nature of the read operation. In one such embodiment, the data which is read is also written back in the writeback time window after the read time window. In some embodiments, PL (e.g., PL0_1) is asserted for the bit-cell which is being read. Other unselected PLs (e.g., PL0_2, PL_3, . . . PL0_n) of the bit-cell are kept at 0V during read operation, and then to Vdd/2 during writeback if the first scheme is followed. Here, here, ‘x’ in PLx_n indicates the same orientation as BL. For example, plate-lines PL0_1, PL0_2, and PL0_3 are parallel to BL0. Likewise, plate-lines PL1_1, PL1_2, and PL1_3 are parallel to BL1, and so on.

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