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    • 33. 发明申请
    • Method and system for analyzing single event upset in semiconductor devices
    • 用于分析半导体器件中的单事件不正常的方法和系统
    • US20070096754A1
    • 2007-05-03
    • US11265824
    • 2005-11-03
    • Michael JohnsonKeith GolkePamela VogtDavid Nelson
    • Michael JohnsonKeith GolkePamela VogtDavid Nelson
    • G01R31/302
    • G01R31/3181G01R31/31816
    • A simulation model is used to predict a semiconductor device's response to a single event upset. The simulation model is connected to a model of the semiconductor device to be tested. The simulation model switches in an impedance path between a node to be tested in the semiconductor device model and an opposite voltage supply until a predefined amount of charge has been reached via sourcing (for a low to high voltage transition) or sinking (for a high to low voltage transition). When the predefined amount of charge has been reached, the impedance path is switched out. The switching of the impedance path approximates the charge movement that occurs from a heavy ion strike passing through a sensitive volume. By varying the predefined amount of charge, the semiconductor device's susceptibility to SEU can be predicted without having to resort to physical testing.
    • 模拟模型用于预测半导体器件对单个事件不安的响应。 仿真模型连接到要测试的半导体器件的模型。 模拟模型切换半导体器件模型中要测试的节点之间的阻抗路径和相反的电源,直到通过源(达到低电压转换)或下沉(达到高电平)达到预定量的电荷 到低压转换)。 当达到预定量的电荷时,阻抗路径被切断。 阻抗路径的切换近似于通过敏感体积的重离子冲击发生的电荷运动。 通过改变预定量的电荷,可以预测半导体器件对SEU的敏感性,而无需诉诸于物理测试。
    • 38. 发明申请
    • EFFICIENT METHOD AND MEANS FOR INTEGRATION OF POWER CONTROL AND PREDISTORTION IN A TRANSMITTER
    • 用于集成发电机功率控制和预测的有效方法和手段
    • US20060158254A1
    • 2006-07-20
    • US11038928
    • 2005-01-18
    • Michael JohnsonMichael AndrewsRobert Bramble
    • Michael JohnsonMichael AndrewsRobert Bramble
    • H03F1/26
    • H03F1/3247H03F1/3241H04B2001/0416H04B2001/0425
    • A radio-frequency (RF) transmitter power amplifier circuit provides for practically linear performance by predistorting the amplifier input signals to compensate for amplifier distortion at high power levels, and provides a fine degree of control of amplifier power needed to handle complex modulation schemes with widely and rapidly varying power requirements. A predistortion database (20) contains gain and phase corrections for various transmission types and a separate automatic gain control database (38) contains fine amplifier gain corrections. A real-time processor (26) combines the two types of corrections and applies them to the amplifier input signals, and a background processor (16) continually updates both databases in accordance with a programmable priority scheme. Integration of predistortion and amplifier power control is achieved in a manner that minimizes adverse effects of one type of control on the other. One feature of the invention provides for rapid convergence of the predistortion correction.
    • 射频(RF)发射机功率放大器电路通过预失真放大器输入信号来提供实际的线性性能,以补偿在高功率电平下的放大器失真,并且提供了处理复杂调制方案所需的放大器功率的精细程度 并快速变化的电源要求。 预失真数据库(20)包含各种传输类型的增益和相位校正,并且单独的自动增益控制数据库(38)包含精细的放大器增益校正。 实时处理器(26)组合两种类型的校正并将其应用于放大器输入信号,并且后台处理器(16)根据可编程优先级方案不断更新两个数据库。 预失真和放大器功率控制的集成以最小化一种控制的不利影响的方式实现。 本发明的一个特征提供了预失真校正的快速收敛。