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    • 34. 发明授权
    • Differential plate line screen test for ferroelectric latch circuits
    • 铁电锁存电路的差分板线屏蔽测试
    • US08441833B2
    • 2013-05-14
    • US13445076
    • 2012-04-12
    • Scott R. SummerfeltJohn Anthony RodriguezHugh P. McAdamsSteven Craig Bartling
    • Scott R. SummerfeltJohn Anthony RodriguezHugh P. McAdamsSteven Craig Bartling
    • G11C11/22
    • G11C29/50G11C11/22
    • Non-volatile latch circuits, such as in memory cells and flip-flops, that are constructed for reliability screening. The non-volatile latch circuits each include ferroelectric capacitors coupled to storage nodes, for example at the outputs of cross-coupled inverters. Separate plate lines are connected to the ferroelectric capacitors of the complementary storage nodes. A time-zero test of the latch stability margin is performed by setting a logic state at the storage nodes, then programming the state into the ferroelectric capacitors by polarization. After power-down, the plate lines are biased with a differential voltage relative to one another, and the latch is then powered up to attempt recall of the programmed state. The differential voltage disturbs the recall, and provides a measure of the cell margin and its later-life reliability.
    • 构建用于可靠性筛选的非易失性锁存电路,例如在存储器单元和触发器中。 非易失性锁存电路各自包括耦合到存储节点的铁电电容器,例如在交叉耦合的反相器的输出端。 单独的板线连接到互补存储节点的铁电电容器。 通过在存储节点设置逻辑状态,然后通过极化将状态编程到铁电电容器中来执行锁存稳定裕度的时间零测试。 掉电后,电路板以相对于彼此的差分电压偏置,然后锁存器上电以尝试调用编程状态。 差分电压会干扰召回,并提供信号余量的测量及其后期寿命的可靠性。
    • 35. 发明授权
    • Modeling of ferroelectric capacitors to include local statistical variations of ferroelectric properties
    • 铁电电容器的建模包括铁电性质的局部统计变化
    • US08380476B2
    • 2013-02-19
    • US12568910
    • 2009-09-29
    • Borna ObradovicKeith R. GreenScott R. Summerfelt
    • Borna ObradovicKeith R. GreenScott R. Summerfelt
    • G06F17/50G06G7/62
    • G06F17/5036
    • Simulation of an electronic circuit including a model of a ferroelectric capacitor. The model of the ferroelectric capacitor includes a multi-domain ferroelectric capacitor, in which each of the domains is associated with a positive and a negative coercive voltage. A probability distribution function of positive and negative coercive voltages is defined, from which a weighting function of the distribution of domains having those coercive voltages is defined. To create a model of a small ferroelectric capacitor, a Poisson probability distribution is assigned to each of an array of gridcells defining the probability distribution function of positive and negative coercive voltages, and a number of domains assigned to each gridcell is randomly selected according to that Poisson distribution and an expected number of domains in the modeled capacitor for that gridcell, based on the area of the modeled capacitor. The electrical behavior of the ferroelectric capacitor is evaluated by evaluating the superposed polarization of each of the randomly selected domains.
    • 包括铁电电容器型号的电子电路仿真。 铁电电容器的模型包括多畴铁电电容器,其中每个畴与正矫顽电压和负矫顽电压相关联。 定义正矫顽电压和负矫顽电压的概率分布函数,从而确定具有矫顽电压的域的分布的加权函数。 为了创建小型铁电电容器的模型,将Poisson概率分布分配给定义正和负矫顽电压的概率分布函数的网格单元阵列中的每一个,并且分配给每个网格单元的域的数量根据该格子随机选择 基于建模电容器的面积,该网格单元的建模电容器的泊松分布和预期数量的域。 通过评估每个随机选择的畴的叠加极化来评估铁电电容器的电性能。