知搜-全球专利检索

  1. 登录
  2. 注册

搜索结果

15 条记录 (耗时 0.022 秒)

    Method and Apparatus For Automatic Gain Control
    1.
    发明申请
    Method and Apparatus For Automatic Gain Control 审中-公开
    自动增益控制的方法和装置

    公开(公告)号：US20090252347A1

    公开(公告)日：2009-10-08

    申请号：US12125638

    申请日：2008-05-22

    申请人： Srinath Kakkeri ,  Mahabaleshwara R. Bhatt ,  Sridhar Gurram ,  Mazhar K.U Sameullah ,  Narsinga Rao Chella

    发明人： Srinath Kakkeri ,  Mahabaleshwara R. Bhatt ,  Sridhar Gurram ,  Mazhar K.U Sameullah ,  Narsinga Rao Chella

    IPC分类号： H03G3/00

    CPC分类号： H03G3/3026 ,  H03G2201/508 ,  H03G2201/606

    摘要： A method and apparatus for Automatic Gain Control (AGC) that provides an output signal having a smooth gain variation for any input signal. The various embodiments assure that the output signal will reach a required output level in a specified attack or decay period. A curvilinear reference gain characteristic is applied to the gain variations. One example uses an exponential curve and sets an initial and final value of the gain law for both attack and decay periods as presets. The various embodiments further compute intermediate gain values of the curvilinear paths that archives the smooth variations is also proposed. Other possible curvilinear characteristics may be used such as, but not limited to, logarithmic, hyperbolic, sinusoidal, etc. that are expressible as exponentials. Intermediate gain values may be determined either by table lookup or by on the fly computation of the curvilinear characteristic.

    摘要翻译： 一种用于自动增益控制（AGC）的方法和装置，其提供对于任何输入信号具有平滑增益变化的输出信号。 各种实施例确保输出信号将在指定的攻击或衰减期内达到所需的输出电平。 曲线参考增益特性应用于增益变化。 一个例子使用指数曲线，并将攻击和衰减周期的增益定律的初始值和最终值设置为预设。 各种实施例进一步计算了还提出了归档平滑变化的曲线路径的中间增益值。 可以使用其他可能的曲线特征，例如但不限于作为指数表示的对数，双曲线，正弦曲线等。 中间增益值可以通过表查找或曲线特征的飞行计算来确定。

    Dynamically varying linearity system for an RF front-end of a communication device
    2.
    发明授权
    Dynamically varying linearity system for an RF front-end of a communication device 失效
    用于通信设备的RF前端的动态变化的线性系统

    公开(公告)号：US06560446B2

    公开(公告)日：2003-05-06

    申请号：US09811082

    申请日：2001-03-16

    申请人： Balasubramanian Ramachandran

    发明人： Balasubramanian Ramachandran

    IPC分类号： H04Q720

    CPC分类号： H04W52/267 ,  H03G3/004 ,  H03G3/3042 ,  H03G2201/103 ,  H03G2201/307 ,  H03G2201/40 ,  H03G2201/508 ,  H04B1/109 ,  H04L1/0001 ,  H04W52/08 ,  H04W52/38

    摘要： A dynamically varying linearity system “DVLS” capable of varying the linearity of a radio frequency (RF) front-end of a communication device responsive to receiving a condition signal indicating a desired mode of operation of a transmitter. The DVLS may include a condition signal indicative of the desired mode of operation and a controller that adjusts the linearity of the transmitter responsive to the condition signal. The condition signal may be responsive to a user interface. The controller, responsive to the condition signal, may dynamically adjust the operating current of the transmitter.

    摘要翻译： 一种动态变化的线性系统“DVLS”，其能够响应于接收到指示发射机的所需操作模式的条件信号而改变通信设备的射频（RF）前端的线性度。 DVLS可以包括指示期望的操作模式的条件信号和响应于条件信号来调整发射机的线性度的控制器。 条件信号可以响应于用户界面。 控制器响应于条件信号，可以动态地调整发射机的工作电流。

    System and method for minimizing dissipation in RF power amplifiers
    4.
    发明授权
    System and method for minimizing dissipation in RF power amplifiers 有权
    用于最小化RF功率放大器散热的系统和方法

    公开(公告)号：US06683496B2

    公开(公告)日：2004-01-27

    申请号：US09931737

    申请日：2001-08-20

    申请人： Peter John Poggi ,  Tim Dittmer ,  George Cabrera

    发明人： Peter John Poggi ,  Tim Dittmer ,  George Cabrera

    IPC分类号： H03G516

    CPC分类号： H03G3/3042 ,  H03F1/0222 ,  H03F1/0233 ,  H03F1/0244 ,  H03F1/0277 ,  H03F3/211 ,  H03G3/004 ,  H03G2201/103 ,  H03G2201/504 ,  H03G2201/508 ,  H03G2201/702

    摘要： The variable power supply to an amplifier in an electrical circuit is dynamically controlled through the use of a lookup table responsive to one or more operating conditions of the electrical circuit. The lookup table is indexed by one or more of the operating conditions and the amount of amplification to be applied to an input signal to the amplifier is determined. One embodiment of the invention comprises a television transmitter circuit including a power amplifier circuit capable of amplifying a variable frequency COFDM or 8VSB input signal where the amount of amplification applied to the input signal is dynamically controlled through the use of a lookup table as a function of the frequency of the input signal.

    摘要翻译： 通过使用响应于电路的一个或多个操作条件的查找表来动态地控制电路中的放大器的可变电源。 查找表由一个或多个操作条件索引，并确定要施加到放大器的输入信号的放大量。 本发明的一个实施例包括一种电视发射机电路，其包括能够放大可变频率COFDM或8VSB输入信号的功率放大器电路，其中通过使用查找表作为函数来动态地控制施加到输入信号的放大量 输入信号的频率。

    COMPENSATION METHOD FOR CHARACTERISTIC DIFFERENCE OF PHOTOELECTRIC ELEMENT
    5.
    发明公开
    COMPENSATION METHOD FOR CHARACTERISTIC DIFFERENCE OF PHOTOELECTRIC ELEMENT 审中-公开

    公开(公告)号：US20240178809A1

    公开(公告)日：2024-05-30

    申请号：US18080179

    申请日：2022-12-13

    申请人： Teco Image Systems Co., Ltd.

    发明人： Kuei-Chung Chang

    IPC分类号： H03G3/00 ,  H03G3/30

    CPC分类号： H03G3/007 ,  H03G3/3015 ,  H03G2201/506 ,  H03G2201/508

    摘要： A compensation method for a characteristic difference of a photoelectric element is disclosed. The method includes (S1) providing a test substrate with a connector, a photoelectric element and a plurality of gain units, wherein the plurality of gain units are connected in parallel, and each gain unit includes a gain resistor and a disconnection port; (S2) connecting the connector to a test fixture which includes a test resistor and a test control unit, wherein when the test fixture is connected with the connector, the test resistor is electrically connected between the second pin and the third pin; (S3) providing input power to the connector so as to generate a test voltage on the photoelectric element; (S4) selecting the corresponding gain unit according to the test voltage and a classification data table; (S5) driving a production line to connect the first contact and the second contact of the selected gain unit.

    Dynamically varying linearity system for an RF front-end of a communication device
    7.
    发明授权
    Dynamically varying linearity system for an RF front-end of a communication device 失效
    用于通信设备的RF前端的动态变化的线性系统

    公开(公告)号：US06674999B2

    公开(公告)日：2004-01-06

    申请号：US09811082

    申请日：2001-03-16

    申请人： Balasubramanian Ramachandran

    发明人： Balasubramanian Ramachandran

    IPC分类号： H04Q720

    CPC分类号： H04W52/267 ,  H03G3/004 ,  H03G3/3042 ,  H03G2201/103 ,  H03G2201/307 ,  H03G2201/40 ,  H03G2201/508 ,  H04B1/109 ,  H04L1/0001 ,  H04W52/08 ,  H04W52/38

    摘要： A dynamically varying linearity system “DVLS” capable of varying the linearity of a radio frequency (RF) front-end of a communication device responsive to receiving a condition signal indicating a desired mode of operation of a transmitter. The DVLS may include a condition signal indicative of the desired mode of operation and a controller that adjusts the linearity of the transmitter responsive to the condition signal. The condition signal may be responsive to a user interface. The controller, responsive to the condition signal, may dynamically adjust the operating current of the transmitter.

    摘要翻译： 一种动态变化的线性系统“DVLS”，其能够响应于接收到指示发射机的所需操作模式的条件信号而改变通信设备的射频（RF）前端的线性度。 DVLS可以包括指示期望的操作模式的条件信号和响应于条件信号来调整发射机的线性度的控制器。 条件信号可以响应于用户界面。 控制器响应于条件信号，可以动态地调整发射机的工作电流。

    METHOD AND APPARATUS FOR ACHIEVING LINEAR MONOTONIC OUTPUT POWER
    8.
    发明申请
    METHOD AND APPARATUS FOR ACHIEVING LINEAR MONOTONIC OUTPUT POWER 有权
    用于实现线性单色输出功率的方法和装置

    公开(公告)号：US20070229330A1

    公开(公告)日：2007-10-04

    申请号：US11626134

    申请日：2007-01-23

    申请人： Srinivas Guda ,  Kevin Atkinson ,  Amit Butala

    发明人： Srinivas Guda ,  Kevin Atkinson ,  Amit Butala

    IPC分类号： H03M7/00

    CPC分类号： H03G3/3042 ,  H03G2201/508 ,  H04W52/146 ,  H04W52/367

    摘要： Techniques for achieving linear monotonic output power with piecewise non-linear and/or non-monotonic circuits are described. A coarse gain is selected for a first circuit having non-linear and/or non-monotonic characteristics. A fine gain is selected for a second circuit used to account for output power error due to the coarse gain. First and second look-up tables may store output power versus gain for the first and second circuits, respectively. An output power in the first look-up table may be selected based on the requested output power, and the gain corresponding to the selected output power may be provided as the coarse gain. An output power in the second look-up table may be selected based on the output power error, and the gain corresponding to the selected output power may be provided as the second gain.

    摘要翻译： 描述了用分段非线性和/或非单调电路实现线性单调输出功率的技术。 对具有非线性和/或非单调特性的第一电路选择粗增益。 对于用于考虑由于粗增益导致的输出功率误差的第二电路，选择精细增益。 第一和第二查找表可以分别存储第一和第二电路的输出功率与增益。 可以基于所请求的输出功率来选择第一查找表中的输出功率，并且可以将与所选择的输出功率相对应的增益提供为粗增益。 可以基于输出功率误差来选择第二查找表中的输出功率，并且可以将与所选输出功率相对应的增益提供为第二增益。

    Automatic gain control and antenna selection method for a radio communication system
    10.
    发明申请
    Automatic gain control and antenna selection method for a radio communication system 有权
    无线电通信系统的自动增益控制和天线选择方法

    公开(公告)号：US20040259511A1

    公开(公告)日：2004-12-23

    申请号：US10864193

    申请日：2004-06-09

    发明人： Der-Zheng Liu ,  Song-Nien Tang ,  Tai-Cheng Liu ,  Kuang-Yu Yen

    IPC分类号： H03M001/10

    CPC分类号： H03G3/3052 ,  H03G2201/206 ,  H03G2201/302 ,  H03G2201/305 ,  H03G2201/307 ,  H03G2201/502 ,  H03G2201/508 ,  H03M1/185 ,  H04B7/0814

    摘要： The invention provides an automatic gain control and antenna selection method used in a receiver of a radio communication system. The received signal power is estimated by digital signal processing after analog-to-digital conversion in the system, in order to adjust the gain of the front end analog signal until the magnitude of the analog signal is adjusted to an optimum range of the digital signal processing. In addition, the ADC is utilized to estimate the signal power as the basis of the antenna selection.

    摘要翻译： 本发明提供一种在无线电通信系统的接收机中使用的自动增益控制和天线选择方法。 接收到的信号功率通过系统中模数转换后的数字信号处理来估计，以便调整前端模拟信号的增益，直到模拟信号的幅度被调整到数字信号的最佳范围 处理。 此外，ADC用于估计信号功率作为天线选择的基础。