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    • 4. 发明授权
    • Automated system for extracting design and layout information from an
integrated circuit
    • 用于从集成电路中提取设计和布局信息的自动化系统
    • US5086477A
    • 1992-02-04
    • US564175
    • 1990-08-07
    • Kenneth K. YuC. Neil Berglund
    • Kenneth K. YuC. Neil Berglund
    • G06F17/50G06K9/00H01L27/02
    • G06K9/00G06F17/5068H01L27/0203
    • A system for extracting design information from a semiconductor integrated circuit (IC) is disclosed. The system includes a microscope and camera for capturing a composite image of the IC in the form of a video signal. Image capture occurs on a section-by-section basis in which a "snapshot" of each section is taken, the die-holding table stepped to a new section, and a snapshot of the new section obtained. This image capture operation continues until a composite image of the IC is obtained by successive capture of contiguous or partially overlapping images covering all of the different sections of the die. An image processor receives the video signal from the optical means and generates an abstract representation of the die in the form of lists of identifying features such as the size, type and relative location of all transistors, and the width, length and relative location of all of the metal interconnects to the IC. These lists are subsequently compared with reference library circuits by a computer to recognize individual circuit cells. Once all of the ciruit cells on the die have been recognized, the computer then generates a schematic netlist of the IC.
    • 公开了一种从半导体集成电路(IC)提取设计信息的系统。 该系统包括用于以视频信号的形式捕获IC的合成图像的显微镜和相机。 图像捕获发生在逐个部分的基础上,其中采取每个部分的“快照”,模具保持表步进新的部分,并获取新部分的快照。 该图像捕获操作继续进行,直到通过连续捕获覆盖芯片的所有不同部分的连续或部分重叠的图像来获得IC的合成图像。 图像处理器从光学装置接收视频信号,并以所有晶体管的尺寸,类型和相对位置以及所有晶体管的宽度,长度和相对位置等识别特征的列表的形式产生裸片的抽象表示 的金属互连到IC。 这些列表随后通过计算机与参考库电路进行比较以识别各个电路单元。 一旦芯片上的所有电路单元已被识别,计算机然后生成IC的示意网表。
    • 6. 发明授权
    • Current sink for DPT channel unit
    • DPT通道单元的电流吸收器
    • US4440979A
    • 1984-04-03
    • US373814
    • 1982-05-03
    • Gregor D. McGibbonKenneth K. Yu
    • Gregor D. McGibbonKenneth K. Yu
    • H04M7/00H04M7/06H04Q1/38
    • H04M7/0096H04Q1/38
    • DC Saturation effects in the VF transformer of a DPT are reduced or eliminated with apparatus diverting cental office battery loop current away from windings of the transformer when a trunk circuit is seized for an off-hook condition of a calling parties telephone handset. A physically smaller transformer having increased inductance may then be employed for providing increased return loss at low frequencies. The apparatus comprises a current amplifier that is electrically connected across tip and ring lines, with a first switch means in its feedback path, and second switch means for AC coupling a transformer winding to the lines. When the trunk is idle for an on-hook condition of the handset, the amplifier is disabled and the lines are terminated with a large resistance. When the trunk is seized for an off-hook condition of the handset, binary PF and CF signals cause the current amplifier to shunt the resistor and to draw a prescribed amount of DC loop current on the lines for energizing a central office A-relay. This also turns on the second switch means for passing VF signals on the lines to and from the transformer, while blocking DC current from the winding, and terminating the lines with a prescribed impedance. When the calling party is dialing, the CF signal opens the feedback path so that the amplifier is turned hard on and off by pulsing of the PF signal for changing the termination impedance and causing resistive pulsing in the central office.
    • DC在DPT的VF变压器中的饱和效应被降低或消除,当中继电路被抢占主叫方电话听筒的摘机状态时,设备将中心办公室电池回路电流远离变压器的绕组。 可以采用具有增加的电感的物理上较小的变压器来在低频下提供增加的回波损耗。 该装置包括电流放大器,其在尖端和环形线路之间电连接,其反馈路径中的第一开关装置和用于将变压器绕组交流耦合到线路的第二开关装置。 当主干空闲时,手机的挂机状态,放大器被禁用,线路以大电阻终止。 当主干被抓取到手机的摘机状态时,二进制PF和CF信号使得电流放大器分流电阻器,并在线路上引出规定数量的直流回路电流,以激励中心局A继电器。 这也导通第二开关装置,用于使来自变压器的线路上的VF信号通过,同时阻断来自绕组的DC电流,并以规定的阻抗终止线路。 当主叫方正在拨号时,CF信号打开反馈路径,通过脉冲PF信号来改变终端阻抗并引起中心局的电阻脉冲,使放大器变硬。