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    • 2. 发明授权
    • Variable gain amplifier and variable gain amplifier module
    • 可变增益放大器和可变增益放大器模块
    • US07391260B2
    • 2008-06-24
    • US11510403
    • 2006-08-25
    • Young Ho KimMun Yang ParkHyun Kyu Yu
    • Young Ho KimMun Yang ParkHyun Kyu Yu
    • H03F1/36H03F3/45
    • H03G1/007H03F1/08H03F1/34H03F3/45475H03F2200/381H03F2203/45138H03F2203/45522H03F2203/45524
    • An analog variable gain amplifier (VGA) adjusting a signal level of a mobile communication system is provided. More particularly, design of a VGA using an operational transconductance amplifier (OTA) having a wide linear input/output range is disclosed. The VGA includes two double-differential-pair OTAs and feedback resistors. A first differential input of a first double differential pair OTA receives an input signal from the forward stage, and a second differential input is negatively fed back through a differential output and a passive resistor. An input in which a first block of the connection structure and first and second differential inputs of a second double differential pair OTA are connected receives an output signal of the first block stage. The output is negatively fed back in series through a variable resistor whose resistance varies exponentially with an adjustment voltage from outside. According to the VGA, it is possible to provide a characteristic of linear variation of gain on a logarithmic scale with respect to a control voltage with a simple and inexpensive constitution. In addition, the VGA can be designed for a low pass filter having a conventional OTA used for a core circuit, and has a simple circuit structure. Therefore, the VGA is convenient for high integration and low-power design, and thus is appropriate for a terminal chip and so forth.
    • 提供了调整移动通信系统的信号电平的模拟可变增益放大器(VGA)。 更具体地,公开了使用具有宽线性输入/输出范围的运算跨导放大器(OTA)的VGA的设计。 VGA包括两个双差分对OTA和反馈电阻。 第一双差分对OTA的第一差分输入接收来自前级的输入信号,并且第二差分输入通过差分输出和无源电阻负反馈。 其中连接结构的第一块和第二双差分对OTA的第一和第二差分输入相连接的输入端接收第一块级的输出信号。 输出通过可变电阻串联负反馈,其电阻随外部调整电压呈指数变化。 根据VGA,可以以简单且便宜的结构提供相对于控制电压的对数标度的增益的线性变化的特性。 此外,VGA可以设计用于具有用于核心电路的常规OTA的低通滤波器,并且具有简单的电路结构。 因此,VGA对于高集成度和低功耗设计是方便的,因此适用于终端芯片等。