文中介绍了一种限幅开关放大器组件的设计。该组件在接收大信号时通过控制信号来控制射频开关，使信号直通通过；接收小信号时通过控制信号来控制射频开关，使信号通过放大器放大输出，从而使输入信号功率在大范围变化时输出信号保持在一定范围内，起到扩展动态范围的作用。其主要特点是频带宽、增益高、开关速度快。限幅器的作用是使组件在有超出后续电路承受的大功率信号输入时衰减输入信号，保护后续电路在大功率信号下不损坏。开关的作用是对组件的直通和放大两支路进行切换，放大器的作用是对输入小信号进行放大。%Presented here is a module of switch and amplifier with limiting amplitude, which can let high power signal get through and amplify low power signal to output by controlling RF switch, in order to extend the dynamic range of the power of input signal by limiting the power of output signal in some specific range. The characteristics of this module are wide frequency band, high gain and rapid switching. Limiter is the role of the circuit components in a follow-up to withstand the high input power signal, attenuate the input signal when it is so high that the follow-up circuit can not stand. Switch is the role of direct and amplify the component two way switch. The role of the input amplifier is to amplify the smallpower-level signal.
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