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    • 61. 发明申请
    • LOW-NOISE, FAST-SETTLING BIAS CIRCUIT AND METHOD
    • 低噪声,快速稳定偏置电路和方法
    • US20050231274A1
    • 2005-10-20
    • US10823711
    • 2004-04-14
    • Stephen Wu
    • Stephen Wu
    • H03B1/00H03F1/26H03F1/30H03F3/14
    • H03F1/305H03F1/26
    • A low-noise, fast-settling bias circuit includes a first and a second low pass filter, such as RC filters. The second filter initially shorts out a resistor of the first filter with a switch (set to low impedance) in parallel. Accordingly, a capacitor of the first filter quickly charges up to the same voltage as the input bias voltage. As the second filter charges up, the switch slowly shuts off (high impedance). By this time, since the capacitor of the first filter has charged to the same voltage as the bias voltage, a large RC formed by the resistor of the first filter and the capacitor of the first filter is available to provide filtering for the desired bias current.
    • 低噪声,快速稳定的偏置电路包括第一和第二低通滤波器,例如RC滤波器。 第二个滤波器首先将开关(设置为低阻抗)并联的第一个滤波器的电阻短路。 因此,第一滤波器的电容器快速充电至与输入偏置电压相同的电压。 当第二个滤波器充电时,开关缓慢关闭(高阻抗)。 此时,由于第一滤波器的电容器被充电到与偏置电压相同的电压,所以由第一滤波器的电阻器和第一滤波器的电容器形成的大的RC可用于为期望的偏置电流提供滤波 。
    • 66. 发明授权
    • High precision continuous time gmC BPF tuning
    • 高精度连续时间gmC BPF调谐
    • US07974376B2
    • 2011-07-05
    • US11968465
    • 2008-01-02
    • Stephen Wu
    • Stephen Wu
    • H03D3/24
    • H03L7/0805H03J3/08H03L7/099
    • High precision continuous time gmC BPF (Band Pass Filter) tuning. A novel approach is presented by which a continuous time signal serves as a BPF control voltage for tuning of a BPF within a communication device (e.g., transceiver or receiver). A PLL (Phase Locked Loop) tunes the center frequency of the BPF using this continuous time signal, and the PLL oscillates at the center frequency of the BPF. The BPF is implemented as a gmC (transconductance-capacitance) filter, and the PLL is implemented using a number of gm (transconductance) cells as well. The PLL's gm cells and the BPF's gm cells are substantially identical in form. All of these gm cells are operated within their respective linear regions. This similarity of gm cells within the PLL and the BPF provide for substantial immunity to environmental perturbations including temperature and humidity changes as well as fluctuations of power supply voltages.
    • 高精度连续时间gmC BPF(带通滤波器)调谐。 提出了一种新颖的方法,其中连续时间信号用作用于调整通信设备(例如,收发器或接收机)内的BPF的BPF控制电压。 PLL(锁相环)使用该连续时间信号调节BPF的中心频率,PLL以BPF的中心频率振荡。 BPF被实现为gmC(跨导电容)滤波器,并且PLL也使用多个gm(跨导)单元实现。 PLL的gm细胞和BPF的gm细胞在形式上基本相同。 所有这些gm电池在其各自的线性区域内操作。 PLL和BPF之间的gm细胞的相似性提供了对包括温度和湿度变化以及电源电压波动在内的环境扰动的实质性免疫。
    • 67. 发明申请
    • RETRIEVING BOOT INSTRUCTIONS FROM NONVOLATILE MEMORY
    • 从非易失性存储器中检索引导指令
    • US20110078432A1
    • 2011-03-31
    • US12961449
    • 2010-12-06
    • Stephen Wu
    • Stephen Wu
    • G06F9/00G06F1/24
    • G06F9/4406G06F1/24G06F9/4401G06F9/4403G06F9/44573G06F12/0246G06F2212/7201
    • Systems and processes for booting a device can be implemented by detecting a reset signal associated with the device and retrieving a predetermined page of data from a nonvolatile memory location into a register associated with the nonvolatile memory. The nonvolatile memory may be designed and implemented such that each page of data is retrieved from the nonvolatile memory as a unit, and the page of data includes instructions for use in booting the device. A command to read data stored in the register is received, and the command can include an address identifying a location of one or more instructions within the register. In response, the one or more instructions are retrieved from the register for execution by a processor.
    • 用于引导设备的系统和过程可以通过检测与设备相关联的复位信号并从非易失性存储器位置检索数据到与非易失性存储器相关联的寄存器中来实现。 可以设计和实现非易失性存储器,使得每个数据页作为一个单元从非易失性存储器检索,并且数据页包括用于引导设备的指令。 接收读取存储在寄存器中的数据的命令,并且该命令可以包括标识寄存器内的一个或多个指令的位置的地址。 作为响应,从寄存器检索一个或多个指令以由处理器执行。
    • 69. 发明申请
    • METHOD AND SYSTEM FOR FREQUENCY CALIBRATION OF A VOLTAGE CONTROLLED RING OSCILLATOR
    • 电压控制振荡器频率校准的方法和系统
    • US20100201451A1
    • 2010-08-12
    • US12367280
    • 2009-02-06
    • Stephen Wu
    • Stephen Wu
    • H03L7/00
    • H03L7/0995H03L2207/06
    • Aspects of a method and system for frequency calibration of a voltage controlled ring oscillator are provided. In this regard, an oscillating voltage may be generated via a voltage controlled ring oscillator comprising a plurality of delay cells. Each of the plurality of delay cells may comprise a MOSFET differential pair coupled to a plurality of variable resistors. A frequency of oscillation and amplitude of the generated oscillating voltage may be controlled by controlling a resistance of the plurality of variable resistors. The frequency of oscillation and amplitude may be controlled via one or more digital control words generated by a baseband processor, a DSP, and/or a memory. The digital control words may comprise a control word for finely tuning the frequency of oscillation and amplitude and a control word for coarsely tuning the frequency of oscillation and amplitude.
    • 提供了一种用于压控环形振荡器的频率校准的方法和系统。 在这方面,可以经由包括多个延迟单元的压控环形振荡器产生振荡电压。 多个延迟单元中的每一个可以包括耦合到多个可变电阻器的MOSFET差分对。 可以通过控制多个可变电阻器的电阻来控制产生的振荡电压的振荡频率和振幅。 可以通过由基带处理器,DSP和/或存储器产生的一个或多个数字控制字来控制振荡频率和振幅。 数字控制字可以包括用于微调振荡频率和幅度的控制字和用于粗调谐振荡频率的控制字。