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    一种自动增益控制电路及其控制方法
    1.
    发明公开
    一种自动增益控制电路及其控制方法 无效

    公开(公告)号：CN106230398A

    公开(公告)日：2016-12-14

    申请号：CN201610790998.9

    申请日：2016-08-31

    Applicant: 北京和利时智能技术有限公司

    Inventor： 行增晖 ,  肖素委 ,  李梦晨 ,  王辉

    IPC: H03G3/30

    CPC classification number: H03G3/3005 ,  H03G2201/502

    Abstract: 本发明公开一种自动增益控制电路，其电路拓扑简单，电路可靠，成本适中，能够控制煤矿井下胶带机音频通讯的幅值稳定。当任一个扩音电话模块作为送话方通讯时，该扩音电话模块将模拟音频信号送到音频通讯总线上；其它扩音电话模块作为受话方接收音频通讯总线上的模拟音频信号，受话方扩音电话模块通过音频信号隔离缓冲电路将总线上的各个模块进行隔离；正向峰值检测电路将该音频信号的包络峰值发送给微处理器；微处理器对采集到的峰值进行数字滤波处理和限幅处理，获得模拟音频信号的正向峰值，并获得受话方扩音电话模块和送话方扩音电话模块之间的距离，确定音频信号数字放大电路的放大倍数以及音频信号功率放大电路的使能控制。还有控制方法。

    Method for controlling power level of received signal in ultra wide band transmission system
    5.
    发明申请
    Method for controlling power level of received signal in ultra wide band transmission system 失效
    控制超宽带传输系统接收信号功率电平的方法

    公开(公告)号：US20050009490A1

    公开(公告)日：2005-01-13

    申请号：US10841591

    申请日：2004-05-06

    Applicant: Hyung-Soo Lee ,  Sang-In Cho ,  Kyu-Min Kang ,  Chang-Joo Kim

    Inventor： Hyung-Soo Lee ,  Sang-In Cho ,  Kyu-Min Kang ,  Chang-Joo Kim

    IPC: H04B7/26 ,  H03G3/30 ,  H04B1/69 ,  H04B7/005 ,  H03F3/45

    CPC classification number: H04W52/52 ,  H03G3/3052 ,  H03G2201/103 ,  H03G2201/502 ,  H03G2201/702 ,  H04B1/71637

    Abstract: Disclosed is a method for controlling power level of received signal in an ultra wide band transmission system which uses multi frequency bands, and includes a pre-gain controller (PGC) and a voltage gain amplifier (VGA). The method for controlling a power level of a received signal includes the steps of: a) at the PGCs, detecting which multi frequency band is used in a transmitter of the transmission system; b) at the PGCs, obtaining the voltage gain owing to the discrepancy in the power levels of the received signals; and c) at the PGCs, compensating for the power loss based on the voltage gain.

    Abstract translation: 公开了一种在使用多频带的超宽带传输系统中控制接收信号的功率电平的方法，包括预增益控制器（PGC）和电压增益放大器（VGA）。 用于控制接收信号的功率电平的方法包括以下步骤：a）在PGC检测在传输系统的发射机中使用哪个多频带; b）在PGC处，由于接收到的信号的功率电平的差异而获得电压增益; 和c）在PGC处，基于电压增益来补偿功率损耗。

    Multi-channel programmable gain amplifier controlled with a serial interface
    6.
    发明授权
    Multi-channel programmable gain amplifier controlled with a serial interface 有权
    多通道可编程增益放大器采用串行接口控制

    公开(公告)号：US06847904B2

    公开(公告)日：2005-01-25

    申请号：US10374016

    申请日：2003-02-25

    Applicant: Kumen E. Blake ,  James B. Nolan

    Inventor： Kumen E. Blake ,  James B. Nolan

    IPC: G06F19/00 ,  H03F3/00 ,  H03G3/00 ,  H03G3/30

    CPC classification number: H03G3/001 ,  H03G3/3026 ,  H03G2201/103 ,  H03G2201/502

    Abstract: A programmable gain amplifier (PGA) controlled through a serial communications interface are fabricated on an integrated circuit (IC). A multiplexer (MUX) may also be included on the IC. The serial communications interface controls the gain of the PGA, MUX channel selection, and other functions of the PGA. Status of the PGA may also be obtained through the serial communications interface. By using a serial communications interface, the pin count of the PGA IC package may be kept to a minimum.

    Abstract translation: 通过串行通信接口控制的可编程增益放大器（PGA）在集成电路（IC）上制造。 多路复用器（MUX）也可以包括在IC上。 串行通信接口控制PGA的增益，MUX通道选择和PGA的其他功能。 也可以通过串行通信接口获得PGA的状态。 通过使用串行通信接口，可以将PGA IC封装的引脚数保持在最小值。

    Automatic gain control and antenna selection method for a radio communication system
    7.
    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

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

    IPC: H03M001/10

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

    Abstract: 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.

    Abstract translation: 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。

    CIRCUIT FOR VARYING GAIN OF PREAMPLIFIER
    10.
    发明公开
    CIRCUIT FOR VARYING GAIN OF PREAMPLIFIER 有权
    电路变革，加强前置放大器

    公开(公告)号：EP1653607A4

    公开(公告)日：2008-05-28

    申请号：EP03817770

    申请日：2003-07-30

    Applicant: MITSUBISHI ELECTRIC CORP

    Inventor： NOGAMI MASAMICHI ,  NODA MASAKI ,  TAGAMI HITOYUKI ,  MOTOSHIMA KUNIAKI

    IPC: H03G3/20 ,  H03F3/08 ,  H03G3/30

    CPC classification number: H03G3/3084 ,  H03F3/08 ,  H03G1/0047 ,  H03G2201/103 ,  H03G2201/502 ,  H04B10/69

    Abstract: A photodetector (1) converts an optical signal in the form of a burst into an electrical signal and outputs an output current, and a preamplifier (2) having a feedback resistive element (2B) amplifies the output current and outputs a voltage signal. The feedback resistive element (2B), a series circuit of a first resistive element (6) and a first switching element (9), and a series circuit of a second resistive element (7) and a second switching element (10) are connected in parallel to a gain varying circuit (3) for varying the conversion gain of the preamplifier (2). The gain varying circuit (3) generates an operation signal to close the first switching element 9 during a first gain varying period and an operation signal to close the second switching element (10) during a second gain varying period.

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