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    • 4. 发明申请
    • STACKED AMPLIFIER WITH DIODE-BASED BIASING
    • 基于二极管偏置的堆叠放大器
    • WO2011022551A1
    • 2011-02-24
    • PCT/US2010/046023
    • 2010-08-19
    • QUALCOMM INCORPORATEDZHAO, YuPLETCHER, Nathan M.
    • ZHAO, YuPLETCHER, Nathan M.
    • H03F1/02H03F1/30H03F3/189
    • H03F1/0283H03F1/301H03F3/189
    • Techniques for improving linearity of amplifiers are described. In an exemplary design, an amplifier (e.g., a power amplifier) may include a plurality of transistors coupled in a stack and at least one diode. The plurality of transistors may receive and amplify an input signal and provide an output signal. The at least one diode may be operatively coupled to at least one transistor in the stack. Each diode may provide a variable bias voltage to an associated transistor in the stack. Each diode may have a lower voltage drop across the diode at high input power and may provide a higher bias voltage to the associated transistor at high input power. The at least one transistor may have higher gain at high input power due to the higher bias voltage from the at least one diode. The higher gain may improve the linearity of the amplifier.
    • 描述了用于提高放大器线性度的技术。 在示例性设计中,放大器(例如,功率放大器)可以包括耦合在堆叠中的多个晶体管和至少一个二极管。 多个晶体管可以接收和放大输入信号并提供输出信号。 至少一个二极管可以可操作地耦合到堆叠中的至少一个晶体管。 每个二极管可以向堆叠中的相关联的晶体管提供可变偏置电压。 每个二极管可以在高输入功率下在二极管上具有较低的电压降,并且可以在高输入功率下向相关联的晶体管提供更高的偏置电压。 由于来自至少一个二极管的较高偏置电压,至少一个晶体管可能在高输入功率下具有更高的增益。 较高的增益可以提高放大器的线性度。
    • 5. 发明申请
    • POWER AMPLIFIER WITH SWITCHED OUTPUT MATCHING FOR MULTI-MODE OPERATION
    • 具有多模操作的开关量输出匹配功率放大器
    • WO2011011757A1
    • 2011-01-27
    • PCT/US2010/043156
    • 2010-07-23
    • QUALCOMM IncorporatedPLETCHER, Nathan M.HADJICHRISTOS, AristoteleZHAO, YuNEJATI, Babak
    • PLETCHER, Nathan M.HADJICHRISTOS, AristoteleZHAO, YuNEJATI, Babak
    • H04B1/04H03F1/56
    • H04B1/0458H03F1/56H03F3/245H04B1/406
    • Exemplary embodiments are directed to a transmitter with a power amplifier and a switched output matching circuit implementing a plurality of output paths for a plurality of operating modes is described. The power amplifier receives an input RF signal and provides an amplified RF signal. An output matching network performs impedance transformation from low impedance at the power amplifier output to higher impedance at the matching network output. The plurality of output paths are coupled to the output matching network. Each output path provides a different target output impedance for the power amplifier and routes the amplified RF signal from the power amplifier to an antenna when that output path is selected. Each output path may include a matching network coupled in series with a switch. The matching network provides the target output impedance for the power amplifier when the output path is selected. The switch couples or decouples the output path to/from the power amplifier.
    • 示例性实施例涉及具有功率放大器和实现用于多个操作模式的多个输出路径的切换输出匹配电路的发射机。 功率放大器接收输入RF信号并提供放大的RF信号。 输出匹配网络执行从功率放大器输出端的低阻抗到匹配网络输出端的较高阻抗的阻抗变换。 多个输出路径耦合到输出匹配网络。 当选择该输出路径时,每个输出路径为功率放大器提供不同的目标输出阻抗,并将放大的RF信号从功率放大器路由到天线。 每个输出路径可以包括与开关串联耦合的匹配网络。 当选择输出路径时,匹配网络为功率放大器提供目标输出阻抗。 开关将输出路径耦合到/从功率放大器解耦。
    • 7. 发明申请
    • MULTI-STAGE IMPEDANCE MATCHING
    • 多级阻抗匹配
    • WO2011017368A1
    • 2011-02-10
    • PCT/US2010/044306
    • 2010-08-03
    • QUALCOMM INCORPORATEDNEJATI, BabakZHAO, YuPLETCHER, Nathan M.HADJICHRISTOS, AristoteleSEE, Puay Hoe
    • NEJATI, BabakZHAO, YuPLETCHER, Nathan M.HADJICHRISTOS, AristoteleSEE, Puay Hoe
    • H03F1/56H03F3/72
    • H03F1/565H03F3/211H03F3/72
    • Exemplary techniques for performing impedance matching are described. In an exemplary embodiment, the apparatus may include an amplifier (e.g., a power amplifier) coupled to first and second matching circuits. The first matching circuit may include multiple stages coupled to a first node and may provide input impedance matching for the amplifier. The second matching circuit may include multiple stages coupled to a second node and may provide output impedance matching for the amplifier. At least one switch may be coupled between the first and second nodes and may bypass or select the amplifier. The first and second nodes may have a common impedance. The apparatus may further include a second amplifier coupled in parallel with the amplifier and further to the matching circuits. The second matching circuit may include a first input stage coupled to the amplifier, a second input stage coupled to the second amplifier, and a second stage coupled to the two input stages via switches.
    • 描述了用于执行阻抗匹配的示例性技术。 在示例性实施例中,该装置可以包括耦合到第一和第二匹配电路的放大器(例如功率放大器)。 第一匹配电路可以包括耦合到第一节点的多个级并且可以为放大器提供输入阻抗匹配。 第二匹配电路可以包括耦合到第二节点的多个级并且可以为放大器提供输出阻抗匹配。 至少一个开关可以耦合在第一和第二节点之间,并且可以旁路或选择放大器。 第一和第二节点可以具有公共阻抗。 该装置还可以包括与放大器并联并且进一步耦合到匹配电路的第二放大器。 第二匹配电路可以包括耦合到放大器的第一输入级,耦合到第二放大器的第二输入级,以及经由开关耦合到两个输入级的第二级。
    • 10. 发明申请
    • DIGITAL TUNABLE INTER-STAGE MATCHING CIRCUIT
    • 数字可调节的级间匹配电路
    • WO2011022549A2
    • 2011-02-24
    • PCT/US2010/046021
    • 2010-08-19
    • QUALCOMM INCORPORATEDZHAO, YuNEJATI, BabakPLETCHER, Nathan M.HADJICHRISTOS, Aristotele
    • ZHAO, YuNEJATI, BabakPLETCHER, Nathan M.HADJICHRISTOS, Aristotele
    • H03H7/38
    • H03F1/42H03F1/223H03F3/193H03F2200/318H03H7/40
    • A tunable inter-stage matching circuit that can improve performance is described. In an exemplary design, an apparatus includes a first active circuit (e.g., a driver amplifier), a second active circuit (e.g., a power amplifier), and a tunable inter-stage matching circuit coupled between the first and second active circuits. The tunable inter-stage matching circuit includes a tunable capacitor that can be varied in discrete steps to adjust impedance matching between the first and second active circuits. In an exemplary design, the tunable capacitor includes (i) a plurality of capacitors coupled in parallel and (ii) a plurality of switches coupled to the plurality of capacitors, one switch for each capacitor. Each switch may be turned on to select an associated capacitor or turned off to unselect the associated capacitor. The tunable capacitor may further include a fixed capacitor coupled in parallel with the plurality of capacitors.
    • 描述了可以提高性能的可调节级间匹配电路。 在示例性设计中,装置包括耦合在第一和第二有源电路之间的第一有源电路(例如,驱动器放大器),第二有源电路(例如功率放大器)以及可调谐的级间匹配电路。 可调级间匹配电路包括可调电容器,该可调电容器可以在离散步骤中变化以调整第一和第二有源电路之间的阻抗匹配。 在示例性设计中,可调电容器包括(i)并联耦合的多个电容器和(ii)耦合到多个电容器的多个开关,每个电容器一个开关。 每个开关可以打开以选择关联的电容器或关闭以取消选择关联的电容器。 可调电容器还可以包括与多个电容器并联耦合的固定电容器。