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    High linearity variable gain amplifier
    2.
    发明公开
    High linearity variable gain amplifier 审中-公开
    Verstärkermit variablerVerstärkungund hoherLinearität

    公开(公告)号：EP1424772A2

    公开(公告)日：2004-06-02

    申请号：EP03017664.8

    申请日：2003-08-13

    申请人： LINEAR TECHNOLOGY CORPORATION

    发明人： Seremeta, Dorin

    IPC分类号： H03F1/32 ,  H03F1/22 ,  H03G3/30 ,  H03G3/20 ,  H03F3/343

    CPC分类号： H03F3/45103 ,  H03F1/22 ,  H03F1/3211 ,  H03F1/34 ,  H03F3/211 ,  H03F3/3432 ,  H03F3/4508 ,  H03F3/45197 ,  H03F2203/45024 ,  H03F2203/45031 ,  H03F2203/45056 ,  H03F2203/45134 ,  H03F2203/45221 ,  H03F2203/45244 ,  H03F2203/45288 ,  H03F2203/45311 ,  H03F2203/45352 ,  H03F2203/45731 ,  H03G1/0088

    摘要： Variable gain amplifiers offering high frequency response with improved linearity and reduced power dissipation are provided. An amplifier is disclosed that is constructed from a one-stage topology with multiple signal paths and compensation networks for improved linearity and stable operation. In this amplifier, improved performance is obtained by replacing single transistor components with enhanced active devices which incorporate local negative feedback. One embodiment of the invention is a transconductance enhancement circuit that improves transconductance and input impedance relative to the prior art. A further development is an enhanced active cascode circuit that provides improved linearity. A high frequency bipolar transistor switch is also disclosed that incorporates lateral PNP transistors as high frequency switches with improved OFF-state to ON-state impedance ratio to realize a variable gain function. These circuits are combined in an amplifier circuit that provides variable gain and high frequency performance, with improved linearity, gain, and input impedance.

    摘要翻译： 提供了具有提高线性度和降低功耗的高频响应的可变增益放大器。 公开了一种放大器，其由具有多个信号路径和补偿网络的单级拓扑构成，用于改善线性度和稳定运行。 在该放大器中，通过采用并入局部负反馈的增强型有源器件替换单个晶体管元件，可获得改进的性能。 本发明的一个实施例是相对于现有技术改进跨导和输入阻抗的跨导增强电路。 进一步的发展是增强的有源共源共栅电路，其提供改善的线性度。 还公开了一种高频双极晶体管开关，其将横向PNP晶体管作为具有改进的截止状态到导通状态阻抗比的高频开关，以实现可变增益功能。 这些电路组合在提供可变增益和高频性能的放大器电路中，具有改进的线性度，增益和输入阻抗。

    High linearity variable gain amplifier
    4.
    发明公开
    High linearity variable gain amplifier 审中-公开
    Verstärkermit variablerVerstärkungund hoherLinearität

    公开(公告)号：EP2278706A2

    公开(公告)日：2011-01-26

    申请号：EP10173281.6

    申请日：2003-08-13

    申请人： LINEAR TECHNOLOGY CORPORATION

    发明人： Seremeta, Dorin

    IPC分类号： H03F1/32 ,  H03F1/22 ,  H03G3/30 ,  H03G3/20 ,  H03F3/343

    CPC分类号： H03F3/45103 ,  H03F1/22 ,  H03F1/3211 ,  H03F1/34 ,  H03F3/211 ,  H03F3/3432 ,  H03F3/4508 ,  H03F3/45197 ,  H03F2203/45024 ,  H03F2203/45031 ,  H03F2203/45056 ,  H03F2203/45134 ,  H03F2203/45221 ,  H03F2203/45244 ,  H03F2203/45288 ,  H03F2203/45311 ,  H03F2203/45352 ,  H03F2203/45731 ,  H03G1/0088

    摘要： Variable gain amplifiers offering high frequency response with improved linearity and reduced power dissipation are provided. An amplifier is disclosed that is constructed from a one-stage topology with multiple signal paths and compensation networks for improved linearity and stable operation. In this amplifier, improved performance is obtained by replacing single transistor components with enhanced active devices which incorporate local negative feedback. One embodiment of the invention is a transconductance enhancement circuit that improves transconductance and input impedance relative to the prior art. A further development is an enhanced active cascode circuit that provides improved linearity. A high frequency bipolar transistor switch is also disclosed that incorporates lateral PNP transistors as high frequency switches with improved OFF-state to ON-state impedance ratio to realize a variable gain function. These circuits are combined in an amplifier circuit that provides variable gain and high frequency performance, with improved linearity, gain, and input impedance.

    摘要翻译： 提供了具有提高线性度和降低功耗的高频响应的可变增益放大器。 公开了一种放大器（300），其由具有多个信号路径和补偿网络的单级拓扑构成，用于改善线性度和稳定的操作。 在该放大器中，通过用增强的有源器件（311,312,313,314）替代单个晶体管元件（其包含局部负反馈）来获得改进的性能。 本发明的一个实施例是相对于现有技术改进跨导和输入阻抗的跨导增强电路。