高频功率放大器电路与用于高频功率放大器的电子部件

    公开(公告)号:CN1610251A

    公开(公告)日:2005-04-27

    申请号:CN200410085267.1

    申请日:2004-10-18

    Abstract: 在使用一种电流镜方法向放大FET提供偏压的高频功率放大器电路中,能够自动校正因FET沟道杂质浓度的耗散所导致的临界电压Vth的耗散、以及因短沟道效应所导致的临界电压Vth和沟道长度调制系数λ的耗散所产生的一个偏压点的偏移,并且能够减小高频功率放大特性的耗散。在使用一种电流镜方法向放大放大FET提供偏压的高频功率放大器电路中,电流模拟晶体管拥有与放大晶体管相同的沟道长度或基极宽度,并且按与放大晶体管相同的工艺加以形成。一个偏压生成电路,用于把一个根据施加于晶体管的电流所形成的一个电压与一个由把来自恒流电路的电流转换成电压的电流-电压转换元件所生成的一个参考电压加以比较,并向所述放大晶体管和电流模拟晶体管提供一个能够禁止放大晶体管的无功电流因短沟道效应或早期效应而变化的偏压。

    一种多功能无线音乐话筒
    36.
    发明申请

    公开(公告)号:WO2018086301A1

    公开(公告)日:2018-05-17

    申请号:PCT/CN2017/078870

    申请日:2017-03-30

    Inventor: 邹明炳

    Abstract: 本发明提供了一种多功能无线音乐话筒,属于无线通讯与音频处理领域,该无线音乐话筒包括中央处理器模块、音源接收模块、音源信号处理模块、声音采集模块、声音信号处理模块、混响处理模块和信号发射模块;其中,音源接收模块通过无线网络接收手机、平板电脑等设备的传输歌曲,音源信号处理模块根据用户设置去除接收音乐中的原唱并保留伴奏,用户声音、音乐或伴奏通过混响处理模块实现润色和混合后,再由信号发射模块通过无线网络发送至音箱。本发明提供的多功能无线音乐话筒不仅适用于多种无线通讯方式,而且能将歌曲与用户声音有效混合、放大与润色,实现歌曲的原唱可调消除,可以广泛应用于车载、户外音箱娱乐或室内宣讲、会议等场景。

    MODULATOR, TRANSMITTER, TRANSCEIVER AND METHOD OF OPERATING A TRANSCEIVER
    37.
    发明申请
    MODULATOR, TRANSMITTER, TRANSCEIVER AND METHOD OF OPERATING A TRANSCEIVER 审中-公开
    调制器,发射器,收发器和操作收发器的方法

    公开(公告)号:WO2006082556A2

    公开(公告)日:2006-08-10

    申请号:PCT/IB2006/050328

    申请日:2006-01-31

    Abstract: A modulator (100) for producing a modulated carrier signal in a radio transmitter and suitable for coupling to a power amplifier (40) whose output power is controllable by a DC supply voltage. The modulator (100) comprises quadrature generation means (110) for generating baseband in-phase (I) and quadrature-phase (Q) signal components for a non-constant envelope modulation scheme from a base band data signal, means (30, 32) for scaling the I and Q signal components by a scaling factor for effecting transmitter power control, quadrature modulation means (34 for modulating a carrier signal with the I and Q signal components, and power supply control means (120) for generating, from a baseband signal prior to modulation of the carrier, a power supply control signal which tracks the envelope of the modulated carrier signal for controlling a DC supply voltage of the power amplifier (40). The modulator (100) may comprise additional modes of operation encompassing peak envelope tracking, constant envelope modulation, and envelope elimination and restoration.

    Abstract translation: 一种调制器(100),用于在无线电发射机中产生调制的载波信号,并且适于耦合到功率放大器(40),功率放大器的输出功率由直流电源电压控制。 调制器(100)包括用于从基带数据信号产生用于非恒定包络调制方案的基带同相(I)和正交相位(Q)信号分量的正交产生装置(110),装置(30,32 )用于通过用于实现发射机功率控制的缩放因子来缩放I和Q信号分量,正交调制装置(34用于利用I和Q信号分量调制载波信号)和电源控制装置(120),用于从 在调制载波之前的基带信号,跟踪用于控制功率放大器(40)的DC电源电压的调制载波信号的包络的电源控制信号,调制器(100)可以包括额外的操作模式,包括峰值 包络跟踪,恒定包络调制和包络消除和恢复。

    AGC CIRCUIT ARRANGEMENT FOR A TUNER
    38.
    发明申请
    AGC CIRCUIT ARRANGEMENT FOR A TUNER 审中-公开
    AGC调谐器的电路布置

    公开(公告)号:WO2005067243A1

    公开(公告)日:2005-07-21

    申请号:PCT/US2004/001582

    申请日:2004-01-20

    Abstract: A method and apparatus for generating the adaptive gain control signals in a communications receiver is disclosed. The present invention can be used with existing two-stage gain architectures, and overcomes many undesirable characteristics of the previous mechanism. An apparatus is presented wherein each of a plurality of RF AGC gain controllable amplifiers (140 and 150) are individually controlled by individual AGC control signals generated by an AGC controller (105) so that the level of the output signal from each of the RF AGC gain controllable amplifiers is individually optimized for tuner performance (170 and 190).

    Abstract translation: 公开了一种在通信接收机中产生自适应增益控制信号的方法和装置。 本发明可以与现有的两级增益架构一起使用,并克服了先前机制的许多不期望的特征。 提出了一种装置,其中多个RF AGC增益可控放大器(140和150)中的每一个由AGC控制器(105)产生的各个AGC控制信号分别控制,使得来自每个RF AGC的输出信号的电平 增益可控放大器针对调谐器性能进行单独优化(170和190)。

    Linear and non-linear dual mode transmitter
    40.
    发明公开
    Linear and non-linear dual mode transmitter 审中-公开
    直链和具有两种操作模式的非线性发射机

    公开(公告)号:EP1705800A3

    公开(公告)日:2010-01-06

    申请号:EP05026024.9

    申请日:2005-11-29

    Inventor: Pan, Meng-An

    Abstract: A transmitter includes a dual mode modulator and an amplifier coupled to the dual mode modulator. The dual mode modulator implements a linear modulation scheme during a first mode of the modulator to produce a variable envelope modulated signal. The dual mode modulator implements a non-linear modulation scheme during a second mode of the modulator to produce a constant envelope modulated signal. The amplifier is biased as a linear amplifier during the first mode of the modulator and is biased as a non-linear amplifier during the second mode of the modulator. A feed-forward connection between the dual mode modulator and the amplifier is used to indicate a change in modulation mode and to adjust the bias of the amplifier. A power of the constant envelope modulated signal is increased such that an operating point of the amplifier remains substantially constant during the first and second modes of the modulator.

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