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Non-linear polar material based low power multiplier with NOR and NAND gate based reset mechanism

專利號
US11888479B1
公開日期
2024-01-30
申請人
Kepler Computing Inc.(US CA San Francisco)
發(fā)明人
Amrita Mathuriya; Rafael Rios; Ikenna Odinaka; Rajeev Kumar Dokania; Sasikanth Manipatruni
IPC分類
H03K19/23; H03K19/0185; G06F7/487; H03K19/017; G06F7/501; H03K19/17736
技術(shù)領(lǐng)域
reset,gate,majority,pull,capacitors,adder,minority,multiplier,gates,node
地域: CA CA San Francisco

摘要

A multiplier cell is derived from a 1-bit full adder and an AND gate. The 1-bit full adder is derived from majority and/or minority gates. The majority and/or minority gates include non-linear polar material (e.g., ferroelectric or paraelectric material). A reset mechanism is provided to reset the nodes across the non-linear polar material. The multiplier cell is a hybrid of majority and/or minority gates and complementary metal oxide semiconductor (CMOS) based inverters and/or buffers. The adder uses a non-linear polar capacitor to retain charge with fewer transistors than traditional CMOS sequential circuits. The non-linear polar capacitor includes ferroelectric material, paraelectric material, or non-linear dielectric. Input signals are received by respective terminals of capacitors having non-linear polar material. The other terminals of these capacitors are coupled to a node where the majority function takes place for the inputs.

說明書

FIG. 8C illustrates 1-bit full adder 830 with a reset mechanism having two NOR gates, wherein the 1-bit full adder includes majority or minority gates with ferroelectric capacitors that are sequentially reset, in accordance with some embodiments. 1-bit full adder 830 is derived from multiplier cell 800 after AND gate 302, pull-up device MP1, and pull-down device MN1 are removed. Inputs X, Y, and Sum_in are repurposed. For example, input Sum_in is removed, input Y is relabeled as ‘A’ and input B is relabeled as ‘B’. During reset phase, rst is asserted, and inputs A, B, and C_in are conditioned as 0, 1, and 0, respectively. Note, A, B, and Cin are symmetric and can be swapped with one another. In this example, input terminals of capacitors CFE4, CFE5, and CFE6 are conditioned to 0, 1, and 0, respectively while input terminals of capacitors CFE7, CFE8, CFE9, CFE10, and CFE11 are conditioned to 0, 0, 0, 1, and 1 respectively. Floating node c1 is then pulled up and then pulled down using rh2 and r12, respectively, in accordance with various embodiments. In some embodiments, floating node s1 is pulled up and then pulled down using rh3 and r13, respectively. In some embodiments, floating node s1 is pulled up and then pulled down after floating node c1 is being pulled up and pulled down. In this case, the floating nodes are reset in a sequence. During the reset phase the outputs Cout and Sum_out are forced to logical 0 outputs.

權(quán)利要求

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