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    • 6. 发明申请
    • Direct down-conversion receiver with transconductance-capacitor filter and method
    • 具有跨导电容滤波器和方法的直接下变频接收器
    • US20050064839A1
    • 2005-03-24
    • US10668638
    • 2003-09-22
    • Malcolm SmithHongjiang Song
    • Malcolm SmithHongjiang Song
    • H04B1/30H04B1/26
    • H04B1/30
    • A direct-down conversion receiver may include a transconductance-capacitor (GmC) filter to filter undesirable mixing products and provide a filtered baseband-differential signal. The GmC filter may include first and second transconductance-capacitor (GmC) circuits in series and a transconductance-feedback circuit in feedback with the second transconductance-capacitor circuit. The GmC circuits may comprise cross-coupled pairs of transistors to receive a baseband-differential signal and generate a differential output current. The GmC circuits may also comprise MOSCAPs coupled respectively between the differential inputs of the GmC circuit and internal-feedback nodes. In some embodiments, a substantially-constant bias voltage may be maintained across the voltage-dependent capacitors to allow the voltage-dependent capacitors to provide a substantially constant capacitance.
    • 直接降压转换接收器可以包括跨导电容(GmC)滤波器,以滤除不期望的混合产物并提供滤波的基带差分信号。 GmC滤波器可以包括串联的第一和第二跨导电容(GmC)电路和与第二跨导 - 电容电路反馈的跨导 - 反馈电路。 GmC电路可以包括交叉耦合的晶体管对以接收基带差分信号并产生差分输出电流。 GmC电路还可以包括分别耦合在GmC电路的差分输入和内部反馈节点之间的MOSCAP。 在一些实施例中,可以在电压相关的电容器两端保持基本上恒定的偏置电压,以允许电压相关的电容器提供基本恒定的电容。
    • 8. 发明授权
    • CMOS switching circuitry of a transmitter module
    • 发射机模块的CMOS开关电路
    • US08843083B2
    • 2014-09-23
    • US13544541
    • 2012-07-09
    • Malcolm Smith
    • Malcolm Smith
    • H04B1/44
    • H04B1/48H03F1/56H03F3/245H03F3/72H04B1/0458
    • Transmit modules typically constitute passive matching circuitry, harmonic trap filters and an antenna switch to provide isolation between the transmit bands as well as between transmit and receive functions. In complementary metal-oxide semiconductor (CMOS) processes the switch function is difficult to implement as a large voltage swing may result in breakdown of the MOS oxide, drain diode, source diode as well as substrate diodes. Therefore a switching function is provided at a node that has low impedance during transmit that limits the voltage swing that the MOS switches experience. The approach is particularly useful, but not limited to, half duplex transmissions such as those used in global system for mobile (GSM) communication, enhanced data for GSM Evolution (EDGE), and time division synchronous code division multiple access (TDSCDMA).
    • 发射模块通常构成无源匹配电路,谐波陷波滤波器和天线开关,以提供发射频带之间以及发射和接收功能之间的隔离。 在互补金属氧化物半导体(CMOS)工艺中,开关功能难以实现,因为大的电压摆幅可能导致MOS氧化物,漏极二极管,源极二极管以及衬底二极管的击穿。 因此,在传输期间具有低阻抗的节点处提供开关功能,从而限制MOS开关经历的电压摆幅。 该方法特别有用,但不限于半双工传输,例如用于移动(GSM)通信的全球系统,用于GSM演进(EDGE)的增强数据和时分同步码分多址(TDSCDMA))的半双工传输。
    • 9. 发明授权
    • Apparatus and method for sensing and converting radio frequency to direct current
    • 用于检测和转换射频到直流电的装置和方法
    • US08766724B2
    • 2014-07-01
    • US13310593
    • 2011-12-02
    • Daniel HoMalcolm Smith
    • Daniel HoMalcolm Smith
    • H03F1/30H03F1/52
    • H03F3/193H03F1/342H03F1/523H03F2200/456H03F2200/462
    • The apparatus and method thereof accurately sense and convert a radio frequency (RF) current signal to direct current (DC) independent of process variation and temperature, and without requiring high speed, high voltage amplifiers for its operation. The apparatus comprises an AC coupled circuit that couples the RF signal from the main device to a sense device with an N:M ratio, a low pass filter system that extracts the DC content of the RF current signal, and a negative feedback loop that forces the DC content of the main device and the sensed device to be equal. Exemplary embodiments include a current sensor that provides feedback to protect an RF power amplifier from over-current condition, and a RF power detection and control in a RF power amplifier (PA) that multiplies the sensed output current by the sensed output voltage to be used as a feedback to control the PA's bias.
    • 其装置和方法能够将射频(RF)电流信号精确地检测并转换成独立于过程变化和温度的直流电流,并且不需要用于其操作的高速高压放大器。 该装置包括AC耦合电路,其将来自主装置的RF信号耦合到具有N:M比率的感测装置,提供RF电流信号的DC内容的低通滤波器系统以及迫使 主设备和感测设备的DC内容相等。 示例性实施例包括提供反馈以保护RF功率放大器免受过电流状况的电流传感器以及RF感测功率放大器(PA)中的RF功率检测和控制,该功率放大器(PA)将感测的输出电流乘以感测的待使用的输出电压 作为反馈,以控制PA的偏见。
    • 10. 发明申请
    • High rate stimulation method for deep, large bore completions
    • 用于深,大孔完井的高速刺激方法
    • US20100044041A1
    • 2010-02-25
    • US12358079
    • 2009-01-22
    • Malcolm SmithLoyd East, JR.Milorad Stanojcic
    • Malcolm SmithLoyd East, JR.Milorad Stanojcic
    • E21B43/26E21B43/114E21B43/27E21B43/267
    • E21B43/26E21B34/14E21B43/114E21B43/267
    • A method of servicing a wellbore comprising inserting a first tubing member having a flowbore into the wellbore, wherein a manipulatable fracturing tool, or a component thereof, is coupled to the first tubing member and wherein the manipulatable fracturing tool comprises one or more ports configured to alter a flow of fluid through the manipulatable fracturing tool, positioning the manipulatable fracturing tool proximate to a formation zone to be fractured, manipulating the manipulatable fracturing tool to establish fluid communication between the flowbore of the first tubing member and the wellbore, introducing a first component of a composite fluid into the wellbore via the flowbore of the first tubing member, introducing a second component of the composite fluid into the wellbore via an annular space formed by the first tubing member and the wellbore, mixing the first component of the composite fluid with the second component of the composite fluid within the wellbore, and causing a fracture to form or be extended within the formation zone.
    • 一种维修井眼的方法,包括将具有流孔的第一管道构件插入井筒中,其中可操纵的压裂工具或其部件联接到第一管道构件,并且其中可操纵压裂工具包括一个或多个端口, 改变通过可操纵的压裂工具的流体流动,将可操纵的压裂工具定位成靠近要形成断层的形成区域,操纵可操纵的压裂工具以建立第一管道构件的流体与井眼之间的流体连通,引入第一组分 复合流体经由第一管道构件的流道进入井眼,通过由第一管道构件和井筒形成的环形空间将复合流体的第二组分引入井筒中,将复合流体的第一组分与 井筒内的复合流体的第二部分,并导致a 断裂形成或在形成区域内延伸。