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    • 2. 发明授权
    • Methodology to guard ESD protection circuits against precharge effects
    • 保护ESD保护电路免受预充电影响的方法
    • US07864494B2
    • 2011-01-04
    • US12783240
    • 2010-05-19
    • Chih-Ming HungCharvaka Duvvury
    • Chih-Ming HungCharvaka Duvvury
    • H02H9/00
    • H02H9/046
    • An ESD protection circuit (710) is guarded by a parallel first precharge elimination circuit (720) relative to an I/O pad (721) and a parallel second precharge elimination circuit (730) relative to a VDD pad (731). The precharge elimination circuits are synchronized with the ESD protection circuit to eliminate any precharge voltage to ground before an ESD pulse affects the I/O pad or VDD pad. A diode (722) is connected between I/O pad and VDD. Circuit (720) is between I/O pad and ground (740) and is powered by the same VDD. Circuit (720) includes a first resistor (723), a first nMOS transistor (724), and a first RC timer including a second resistor (725) and a first capacitor (726). Circuit (730) includes a third resistor (733), a second nMOS transistor (734), and a second RC timer including a fourth resistor (735) and a second capacitor (736).
    • ESD保护电路(710)相对于VDD焊盘(731)相对于I / O焊盘(721)和并行的第二预充电消除电路(730)由并行的第一预充电消除电路(720)保护。 预充电消除电路与ESD保护电路同步,以在ESD脉冲影响I / O焊盘或VDD焊盘之前消除任何对地的预充电电压。 二极管(722)连接在I / O焊盘和VDD之间。 电路(720)位于I / O焊盘和接地(740)之间,由相同的VDD供电。 电路(720)包括第一电阻器(723),第一nMOS晶体管(724)和包括第二电阻器(725)和第一电容器(726)的第一RC定时器。 电路(730)包括第三电阻器(733),第二nMOS晶体管(734)和包括第四电阻器(735)和第二电容器(736)的第二RC定时器。
    • 7. 发明授权
    • Negative contributive offset compensation in a transmit buffer utilizing inverse clocking
    • 使用反向时钟的发送缓冲器中的负贡献偏移补偿
    • US07405685B2
    • 2008-07-29
    • US11178993
    • 2005-07-11
    • Sameh S. RezeqDirk LeipoldRobert B. StaszewskiChih-Ming Hung
    • Sameh S. RezeqDirk LeipoldRobert B. StaszewskiChih-Ming Hung
    • H03M3/00
    • H03F1/0205H03F1/3241H03F2200/331H03F2200/375H03M3/356H03M3/50H03M7/3026H03M7/3037H04L27/368
    • A novel method and apparatus for a negative contributive offset compensation mechanism for a transmit buffer adapted to compensate for the positive offset generated by higher order sigma-delta modulators used to amplitude modulate the transmit buffer. The positive outputs from the sigma-delta modulator are processed differently than the negative outputs. The inverters associated with the negative outputs in the sigma-delta modulator are removed and the clock signal used to drive the transistors corresponding to the negative outputs is negated or shifted 180 degrees from the clock used to drive the transistors corresponding to the positive outputs. A non-inverted version of the clock is used with the positive outputs and an inverse clock is used with the negative outputs. Use of the inverse clock causes a negative contributive offset to be generated that is added on the second half cycle of each clock. The result is an offset compensated RF output signal having zero offset.
    • 一种用于发射缓冲器的负贡献偏移补偿机制的新颖方法和装置,适用于补偿由用于幅度调制发射缓冲器的高阶Σ-Δ调制器产生的正偏移。 来自Σ-Δ调制器的正输出的处理方式与负输出不同。 与Σ-Δ调制器中的负输出相关联的反相器被去除,并且用于驱动对应于负输出的晶体管的时钟信号与用于驱动对应于正输出的晶体管的时钟相反或偏移180度。 时钟的非反相版本与正输出一起使用,反向时钟与负输出一起使用。 使用逆时钟将产生在每个时钟的第二个半周期上添加的负贡献偏移。 结果是具有零偏移的偏移补偿RF输出信号。
    • 10. 发明授权
    • ESD protection for RF power amplifier circuits
    • RF功率放大器电路的ESD保护
    • US07280330B2
    • 2007-10-09
    • US10936308
    • 2004-09-08
    • Ismail H. OguzmanCharvaka DuvvuryChih-Ming Hung
    • Ismail H. OguzmanCharvaka DuvvuryChih-Ming Hung
    • H02H9/00
    • H01L27/0251H03F1/52H03F2200/294H03F2200/372
    • An electrostatic discharge (ESD) device for protecting a power amplifier circuit is disclosed. The ESD device comprises a first ESD protection circuit coupled between a positive terminal of a supply voltage and a negative terminal of the supply voltage, and a second ESD protection circuit coupled between the negative terminal of the supply voltage and an output terminal of the power amplifier circuit, wherein a first current path is formed from the positive terminal to the output terminal through the first and second ESD protection circuits. A circuit device operative to increase impedance of a second current path from the positive terminal to the output terminal through the power amplifier circuit to divert current from the second current path to the first current path in the course of an ESD event.
    • 公开了一种用于保护功率放大器电路的静电放电(ESD)装置。 ESD器件包括耦合在电源电压的正极端子和电源电压的负极端子之间的第一ESD保护电路和耦合在电源电压的负极端子和功率放大器的输出端子之间的第二ESD保护电路 电路,其中通过所述第一和第二ESD保护电路从所述正极端子到所述输出端子形成第一电流路径。 电路装置,其可操作以通过功率放大器电路增加从正端子到输出端子的第二电流路径的阻抗,以在ESD事件的过程中将电流从第二电流路径转移到第一电流路径。