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    • 2. 发明授权
    • Amplifier feedback and bias configuration
    • 放大器反馈和偏置配置
    • US07446612B2
    • 2008-11-04
    • US11518109
    • 2006-09-08
    • Robert Michael FisherMichael L. Hageman
    • Robert Michael FisherMichael L. Hageman
    • H03F1/30
    • H03F1/34H03F1/0272H03F1/083H03F1/56H03F3/19H03F3/195H03F3/245H03F2200/117H03F2200/144H03F2200/153H03F2200/18H03F2200/21H03F2200/451
    • A wireless communication device output amplifier configured to reduce or eliminate out of band oscillations from voltage standing waves generated by antenna impedance mismatch reflection. The amplifier is configured with an input, output, and biasing node. The biasing node is configured to receive a biasing signal from a biasing amplifier. The biasing amplifier draws current from the biasing node while providing the biasing voltage to the output amplifier. To reduce or eliminate out of band voltage standing waves from antenna reflections, a frequency dependant network is provided as a feedback loop to selectively provide feedback to the output amplifier to reduce or eliminate unwanted out of band oscillations, such as voltage standing waves. The frequency dependant network may comprise one or more resistors, inductors, and capacitors which are of small size and may be integrated.
    • 一种无线通信设备输出放大器,被配置为减少或消除由天线阻抗失配反射产生的电压驻波的带外振荡。 放大器配置有输入,输出和偏置节点。 偏置节点被配置为从偏置放大器接收偏置信号。 偏置放大器从偏置节点吸取电流,同时向输出放大器提供偏置电压。 为了减少或消除来自天线反射的带外电压驻波,提供频率相关网络作为反馈回路,以选择性地向输出放大器提供反馈以减少或消除诸如电压驻波的不期望的带外振荡。 频率依赖网络可以包括一个或多个电阻器,电感器和电容器,其尺寸小并且可以被集成。