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    • 3. 发明授权
    • Stacked amplifier with diode-based biasing
    • 具有基于二极管的偏置的堆叠放大器
    • US08847689B2
    • 2014-09-30
    • US12711858
    • 2010-02-24
    • Yu ZhaoNathan M. Pletcher
    • Yu ZhaoNathan M. Pletcher
    • H03F3/04
    • 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。
    • 4. 发明授权
    • Multi-antenna wireless device with power amplifiers having different characteristics
    • 具有不同特性的功率放大器的多天线无线设备
    • US08670797B2
    • 2014-03-11
    • US13253003
    • 2011-10-04
    • Bhushan Shanti AsuriYu Zhao
    • Bhushan Shanti AsuriYu Zhao
    • H04M1/00
    • H04B1/406H04B1/0064H04B1/0483
    • A wireless device with power amplifiers having different characteristics to support transmission on multiple antennas is disclosed. These power amplifiers may have different gain, different maximum output power levels, etc. in order to meet requirements of different wireless systems. In an exemplary design, an apparatus includes first and second power amplifiers having different characteristics. The first power amplifier amplifies a first input signal and provides a first output signal for a first antenna. The second power amplifier amplifies the first input signal or a second input signal and provides a second output signal for a second antenna, e.g., in a MIMO mode or a transmit diversity mode. Only the first or second power amplifier amplifies another input signal and provides another output signal to the first antenna, e.g., in a CDMA mode or a GSM mode.
    • 具有功率放大器的无线设备具有不同的特性以支持多个天线上的传输。 这些功率放大器可能具有不同的增益,不同的最大输出功率等级,以满足不同无线系统的要求。 在示例性设计中,装置包括具有不同特征的第一和第二功率放大器。 第一功率放大器放大第一输入信号并提供用于第一天线的第一输出信号。 第二功率放大器放大第一输入信号或第二输入信号,并且例如以MIMO模式或发射分集模式为第二天线提供第二输出信号。 只有第一或第二功率放大器放大另一输入信号,并且例如以CDMA模式或GSM模式向第一天线提供另一输出信号。
    • 5. 发明授权
    • Multi-stage impedance matching
    • 多级阻抗匹配
    • US08536950B2
    • 2013-09-17
    • US12641228
    • 2009-12-17
    • Babak NejatiYu ZhaoNathan M PletcherAristotele HadjichristosPuay Hoe See
    • Babak NejatiYu ZhaoNathan M PletcherAristotele HadjichristosPuay Hoe See
    • H03F3/04
    • 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。