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    • 5. 发明公开
    • Doherty amplifier
    • 多尔蒂Verstärker
    • EP2634916A1
    • 2013-09-04
    • EP12360011.6
    • 2012-02-29
    • Alcatel Lucent
    • Grebennikov, AndreiWong, James N.H.
    • H03F1/02H03F1/48H03F1/56
    • H03F1/0288H03F1/486H03F1/56H03F2200/36H03F2200/387H03F2200/39
    • A Doherty amplifier (10) is operable to receive an input signal (Pin) and to provide an amplified output signal (Pout) at an amplifier output (95). The Doherty amplifier (10) comprises: first (30) and second (40) amplifier stages, each amplifier stage being switchable between an amplifying and a non-amplifying state, each amplifier stage being arranged in parallel to receive the input signal (Pin) and, in the amplifying state, to provide a respective amplified signal at a respective amplifier stage output; and an output network (50) comprising first (80) and second (90) impedance transformers, each impedance transformer being coupled at a first side with a respective amplifier stage output and being coupled together in parallel at a second side with the amplifier output (95). By using an alternative, parallel architecture, the impedance transformation ratio experienced by an amplified signal under different operating conditions is significantly reduced compared to that of a traditional architecture which uses a single, series, impedance transformer which combines and transforms the amplified signals from both amplifier stages (30, 40).
    • Doherty放大器(10)可操作以接收输入信号(Pin)并且在放大器输出(95)处提供放大的输出信号(Pout)。 多赫蒂放大器(10)包括:第一(30)和第二(40)放大器级,每个放大器级可在放大和非放大状态之间切换,每个放大器级并联布置以接收输入信号(Pin) 并且在放大状态下,在相应的放大级输出端提供相应的放大信号; 以及包括第一(80)和第二(90)阻抗变换器的输出网络(50),每个阻抗变换器在第一侧与相应的放大器级输出耦合,并且在第二侧与放大器输出 95)。 通过使用另一种并行架构,与使用单个串联阻抗变换器的传统架构相比,在不同工作条件下由放大信号所经历的阻抗变换比显着降低,该变压器组合并变换来自两个放大器的放大信号 阶段(30,40)。
    • 8. 发明公开
    • Feedforward amplifier
    • VorwärtsgekoppelterVerstärker
    • EP1388934A2
    • 2004-02-11
    • EP03254242.5
    • 2003-07-03
    • Hitachi Kokusai Electric Inc.
    • Ishigami, Takeshi, Hitachi Kokusai Electric Inc.Nanao, Yoshinari, Hitachi Kokusai Electric Inc.
    • H03F1/32
    • H03F1/3247H03F1/3235H03F1/486
    • The object of this invention is to provide a feedforward amplifier that performs precise distortion compensation on a plurality of signal groups without adopting broadband frequency-band characteristics for the auxiliary amplifier. This is achieved by inputting a plurality of signal groups, each having a different frequency bandwidth respectively. In a distortion detection loop, a main amplifier 4 is used to amplify this plurality of input signal groups and detect the distortion arising in said main amplifier @4. In a distortion compensation loop the distortion detected in the distortion detection loop is removed from the amplified signal from said main amplifier 4. At this time, the distortion compensation loop has the same number of distortion amplification systems as the number of input signal groups that use the auxiliary amplifiers 12 and 16 to amplify distortion in each input signal group that contains distortion detected by the distortion detection loop, and that removes the sum total of the distortion of each input signal group amplified by this plurality of distortion amplification systems from the amplified signal from the main amplifier 4.
    • 本发明的目的是提供一种在多个信号组上执行精确失真补偿而不采用用于辅助放大器的宽带频带特性的前馈放大器。 这通过分别输入多个具有不同频率带宽的信号组来实现。 在失真检测环路中,使用主放大器4来放大该多个输入信号组并检测在所述主放大器@ 4中出现的失真。 在失真补偿环路中,从所述主放大器4的放大信号中去除在失真检测环路中检测到的失真。此时,失真补偿环路具有与使用的输入信号组的数量相同数量的失真放大系统 辅助放大器12和16放大包含由失真检测环路检测到的失真的每个输入信号组中的失真,并且从放大信号中去除由该多个失真放大系统放大的每个输入信号组的失真总和 从主放大器4。