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    • 3. 发明授权
    • Hierarchical partitioning
    • 分层分区
    • US07555733B1
    • 2009-06-30
    • US11532898
    • 2006-09-18
    • Perry GeeSyed Zakir Hussain
    • Perry GeeSyed Zakir Hussain
    • G06F17/50G06F9/45
    • G06F17/5036
    • Some embodiments provide a method of simulating an electrical circuit that receives a circuit description that has a set of sub-circuits. The method defines several partitions for several sub-circuits. The method then simulates the circuit using the partitioned sub-circuits. In some embodiments, the method ranks the sub-circuits prior to partitioning based on a parent-child relationship that shows how a sub-circuit is instantiated by other sub-circuits. These embodiments partition child sub-circuits first. Some embodiments provide a method of partitioning an electrical circuit that has a set of sub-circuits. For a particular sub-circuit that is instantiated from other sub-circuits, the method duplicates the particular sub-circuit into a first copy and a second copy when one port of the particular sub-circuit is connected to a voltage source in at least one instance and the same port is not connected to a voltage source in at least another instance.
    • 一些实施例提供了一种模拟接收具有一组子电路的电路描述的电路的方法。 该方法为几个子电路定义了几个分区。 该方法然后使用分割的子电路来模拟电路。 在一些实施例中,该方法基于显示子电路如何由其他子电路实例化的父子关系在划分之前对子电路进行排序。 这些实施例首先划分子子电路。 一些实施例提供了一种划分具有一组子电路的电路的方法。 对于从其他子电路实例化的特定子电路,当特定子电路的一个端口连接到至少一个电压源的电压源时,该方法将特定子电路复制成第一副本和第二副本 在至少另一个实例中,相同的端口不连接到电压源。
    • 8. 发明申请
    • LIQUID CRYSTAL MOLECULES COMPRISING HYDROAZULENE STRUCTURES
    • 包含氢氟酸结构的液晶分子
    • US20100264368A1
    • 2010-10-21
    • US11993297
    • 2006-06-19
    • Ludwig PohlHenning HopfZakir Hussain
    • Ludwig PohlHenning HopfZakir Hussain
    • C09K19/32C07C255/50C07C69/753
    • C09K19/32
    • Liquid Crystal Molecules Comprising Hydroazulene Structures Compounds of formula (I); R1i-A1i-(Z2i-A2i)m-(Z3i-A3i)n-(Z4i-A4i)o-R2i (i) wherein at least one of the divalent groups Ai is derived from at least partially hydrogenated azulene, R1i and R2i being hydrogen, an optionally substituted alkyl or alkylene residue, R2i also standing for —CN, —N═C═S, —F, —Cl, —SF5, —CF3, —CHF2, CH2F—O—CF3, —O—CHF2, —O—CH2F, —O—CF2—CF2H, or —O—C2F5, A1i, A2i, A3i and A4i being partially or completely hydrogenated 2,6-azulene, trans-1,4-cyclohexylene, 1,4-cyclohexenylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-14-phenylene, 2,3- and 2,6-difluoro-1,4-phenylene, and 3,5-difluoro-1,4-phenylene, pyrimidine-2,5-diyl, and 1,4-dioxane-2,5-diyl, Z1i, Z2i, Z3i and Z4i being a single bond, —CH2—CH2—, —CF2—CF2—, an ester bond —CO—O—, trans and —CF2—O—, m, n and 0 being independently 0, 1, or 2, liquid crystal media comprising these compounds and liquid crystal displays made with mixtures comprising the novel compounds.
    • 包含薁结构的液晶分子式(I)化合物; R1i-A1i-(Z2i-A2i)m-(Z3i-A3i)n-(Z4i-A4i)o-R2i(i)其中至少一个二价基团Ai衍生自至少部分氢化的薁,R1i和R2i 是氢,任选取代的烷基或亚烷基,R2i还代表-CN,-N = C,-S,-F,-Cl,-SF 5,-CF 3,-CHF 2,CH 2 F-O-CF 3,-O-CHF 2 ,-O-CH2F,-O-CF2-CF2H或-O-C2F5,A1i,A2i,A3i和A4i是部分或完全氢化的2,6-薁,反式-1,4-亚环己基,1,4-亚环己烯 ,1,4-亚苯基,2-氟-1,4-亚苯基,3-氟-14-亚苯基,2,3-和2,6-二氟-1,4-亚苯基,以及3,5-二氟-1 ,4-亚苯基,嘧啶-2,5-二基和1,4-二恶烷-2,5-二基,Z1i,Z2i,Z3i和Z4i为单键,-CH2-CH2-,-CF2-CF2-, 酯键-CO-O-,反式和-CF2-O-,m,n和0独立地为0,1或2,包含这些化合物的液晶介质和由包含新化合物的混合物制成的液晶显示器。
    • 9. 发明授权
    • Real-time adaptive circuit simulation
    • 实时自适应电路仿真
    • US08195439B1
    • 2012-06-05
    • US12264246
    • 2008-11-03
    • Syed Zakir Hussain
    • Syed Zakir Hussain
    • G06F17/50
    • G06F17/5036
    • Some embodiments simulate a mixed-signal circuit design by adaptively applying multiple simulation engines at various regions of the design at various stages of the simulation. Some embodiments partition the mixed-signal design into multiple regions. Some embodiments classify the regions at different time steps of transient analysis. The regions are classified to indicate whether a region is active or inactive at each such time step. Then when analyzing the active regions, some embodiments adaptively apply different solvers to at least two of the active regions based on criteria associated with the active regions. Additionally, some embodiments perform an adaptive bi-direction analysis of the regions. In this manner, some embodiments optimize the circuit simulation by adaptively simulating the design using different solvers that employ greater accuracy where required and greater efficiency when less accuracy is required, thus allowing the simulation to occur with greater overall accuracy, efficiency, and capacity.
    • 一些实施例通过在模拟的各个阶段自适应地在设计的各个区域应用多个模拟引擎来模拟混合信号电路设计。 一些实施例将混合信号设计分成多个区域。 一些实施例在瞬时分析的不同时间步骤对区域进行分类。 区域被分类以指示每个这样的时间步长区域是活动还是非活动。 然后,当分析活动区域时,一些实施例基于与活动区域相关联的标准,将不同的求解器自适应地应用于至少两个活动区域。 另外,一些实施例对区域进行自适应双向分析。 以这种方式,一些实施例通过使用不同的求解器自适应地模拟设计来优化电路仿真,所述求解器在需要时采用更高的精度并且在需要较少的精度时具有更高的效率,从而允许以更高的总体精度,效率和容量发生模拟。