利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

32 条记录 (耗时 0.019 秒)

    Apparatus and method for feed-forward image rejection in a dual conversion receiver
    3.
    发明申请
    Apparatus and method for feed-forward image rejection in a dual conversion receiver 有权
    双转换接收机中前馈图像抑制的装置和方法

    公开(公告)号：US20050191984A1

    公开(公告)日：2005-09-01

    申请号：US10812949

    申请日：2004-03-31

    申请人： Leonard Dauphinee ,  Lawrence Burns

    发明人： Leonard Dauphinee ,  Lawrence Burns

    IPC分类号： H03D7/18 ,  H04B1/10 ,  H04B1/12 ,  H04B1/18 ,  H04B1/26 ,  H04B1/28 ,  H04N5/44 ,  H04N5/50

    CPC分类号： H04B1/28 ,  H04B1/123 ,  Y10S348/909

    摘要： A receiver portion includes a bandpass filter (e.g. SAW filter) that performs channel selection from an input signal having a plurality of channels, and an image cancellation circuit that is in parallel with the bandpass filter. The bandpass filter performs channel selection to select a desired channel that falls in a passband of the bandpass filter. Since the passband is typically a few channels wide, the image channel falls outside the passband and is attenuated by the stopband attenuation of the bandpass filter. The image cancellation circuit includes an attenuator and a phase shifter. The attenuator is configured to have the same attenuation as the stopband attenuation of the bandpass filter at the image channel frequency, and phase shifter is configured to provide a phase shift of approximately 180 degrees. Therefore, the image cancellation circuit has an output that is equal in amplitude, but opposite in phase, to that of the bandpass filter at the image channel frequency. A summer combines the output of the image cancellation circuit with the bandpass filter output to further suppress the image channel frequency over that achieved by the bandpass filter alone.

    摘要翻译： 接收器部分包括从具有多个通道的输入信号执行信道选择的带通滤波器（例如SAW滤波器）以及与带通滤波器并联的图像消除电路。 带通滤波器执行信道选择以选择落入带通滤波器的通带中的期望信道。 由于通带宽通常为几个通道，所以图像通道落在通带外，并被带通滤波器的阻带衰减衰减。 图像消除电路包括衰减器和移相器。 衰减器被配置为具有与图像通道频率处的带通滤波器的阻带衰减相同的衰减，并且移相器被配置为提供大约180度的相移。 因此，图像消除电路具有在图像通道频率上与带通滤波器的振幅相等但相位相反的输出。 夏天将图像消除电路的输出与带通滤波器输出相结合，以进一步抑制图像通道频率超过仅由带通滤波器实现的频率。

    Gain control methods and systems in an amplifier assembly
    4.
    发明申请
    Gain control methods and systems in an amplifier assembly 有权
    放大器组件中的增益控制方法和系统

    公开(公告)号：US20070159244A1

    公开(公告)日：2007-07-12

    申请号：US11710473

    申请日：2007-02-26

    申请人： Leonard Dauphinee ,  Lawrence Burns

    发明人： Leonard Dauphinee ,  Lawrence Burns

    IPC分类号： H03G3/20

    CPC分类号： H01L22/20 ,  G01R31/2607 ,  G01R31/30 ,  G01R31/31723 ,  H01L2924/0002 ,  H03F3/211 ,  H03G3/3036 ,  H03G3/3052 ,  H03G2201/307 ,  H04N5/4446 ,  H04N5/52 ,  H04N7/102 ,  H01L2924/00

    摘要： A Variable Gain Amplifier (VGA) amplifies an input signal according to a gain, to produce an amplified signal. A detector module detects a power indicative of a power of the amplified signal. A comparator module compares the detected power to a high threshold, a low threshold and a target threshold intermediate the high and low thresholds. A controller module changes the gain of the VGA so as to drive the detected power in a direction toward the middle threshold when the comparator module indicates the detected power is not between the high and low thresholds.

    摘要翻译： 可变增益放大器（VGA）根据增益放大输入信号，以产生放大信号。 检测器模块检测指示放大信号的功率的功率。 比较器模块将检测到的功率与高阈值和低阈值中间的高阈值，低阈值和目标阈值进行比较。 当比较器模块指示检测到的功率不在高阈值和低阈值之间时，控制器模块改变VGA的增益以驱动检测到的功率朝向中间阈值的方向。

    Integrated set-top box
    7.
    发明申请
    Integrated set-top box 有权
    集成机顶盒

    公开(公告)号：US20060026661A1

    公开(公告)日：2006-02-02

    申请号：US11133237

    申请日：2005-05-20

    申请人： Donald McMullin ,  Lawrence Burns ,  Leonard Dauphinee ,  Ramon Gomez ,  Loke Tan

    发明人： Donald McMullin ,  Lawrence Burns ,  Leonard Dauphinee ,  Ramon Gomez ,  Loke Tan

    IPC分类号： H04N7/173

    CPC分类号： H04N21/6168 ,  H04N7/17309 ,  H04N21/40

    摘要： The present invention is an integrated set-top box. In one embodiment, the up-stream path and the down-stream path are integrated on a common semiconductor substrate. The down-stream path can include a TV tuner and a digital receiver portion that is integrated on the common semiconductor substrate with a power amplifier of the up-stream path. In another embodiment, the TV tuner is implemented on a first semiconductor substrate and the digital receiver portion and the power amplifier are configured on a second semiconductor substrate. However, the two substrates are mounted on a common carrier so that the set-top box appears to be a single chip configuration to the user.

    摘要翻译： 本发明是一种集成的机顶盒。 在一个实施例中，上游路径和下游路径被集成在公共半导体衬底上。 下行路径可以包括集成在公共半导体衬底上的TV调谐器和数字接收器部分，其具有上行路径的功率放大器。 在另一个实施例中，TV调谐器被实现在第一半导体衬底上，并且数字接收器部分和功率放大器配置在第二半导体衬底上。 然而，两个基板安装在公共载体上，使得机顶盒看起来是用户的单芯片配置。

    Process monitor for monitoring and compensating circuit performance
    9.
    发明申请
    Process monitor for monitoring and compensating circuit performance 有权
    用于监控和补偿电路性能的过程监控

    公开(公告)号：US20050062491A1

    公开(公告)日：2005-03-24

    申请号：US10963639

    申请日：2004-10-14

    申请人： Lawrence Burns ,  Leonard Dauphinee ,  Ramon Gomez ,  James Chang

    发明人： Lawrence Burns ,  Leonard Dauphinee ,  Ramon Gomez ,  James Chang

    IPC分类号： G01R31/26 ,  G01R31/30 ,  G01R31/317 ,  H01L21/66 ,  H03F3/21 ,  H04N5/44 ,  H04N5/52 ,  H04N7/10 ,  G01R31/02

    CPC分类号： H01L22/20 ,  G01R31/2607 ,  G01R31/30 ,  G01R31/31723 ,  H03F3/211 ,  H04N5/4446 ,  H04N5/52 ,  H04N7/102

    摘要： A method and system for monitoring and compensating the performance of an operational circuit is provided. The system includes one or more integrated circuit chips and a controller. Each integrated circuit chip includes one or more operational circuits, each operational circuit having at least one controllable circuit parameter. Each integrated circuit chip also includes a process monitor module at least partially constructed thereon. The controller is coupled to each process monitor module and to each operational circuit. The controller includes logic for evaluating the performance of an operational circuit based on data obtained from process monitor module and operational circuit related data stored in a memory. Based on the evaluation, the controller determines whether any deviations from desired or optimal performance of the circuit exist. If deviations exist, the controller generates a control signal to initiate adjustments to the operational circuit to compensate for the deviations.

    摘要翻译： 提供了一种用于监测和补偿操作电路的性能的方法和系统。 该系统包括一个或多个集成电路芯片和控制器。 每个集成电路芯片包括一个或多个操作电路，每个操作电路具有至少一个可控电路参数。 每个集成电路芯片还包括至少部分地构建在其上的过程监控模块。 控制器耦合到每个过程监控模块和每个操作电路。 控制器包括用于基于从存储在存储器中的过程监视模块和操作电路相关数据获得的数据来评估操作电路的性能的逻辑。 基于评估，控制器确定是否存在与电路的期望或最佳性能的任何偏差。 如果存在偏差，则控制器产生控制信号以启动对运算电路的调整以补偿偏差。