一种小型化大动态范围的接收机信道设计与测试

Design and test of receiver channel with large dynamic range and high sensitivity

当两个较强信号同时被接收机接收时,为了降低其产生的三阶交调分量对接收机造成的干扰,提高接收机的无杂散动态范围,提出了一种高线性度接收机信道设计方案。通过对信道链路合理的增益分配、恰当的元器件选型,实现了输出三阶截断点(3rd-order Output Intercept Point,OIP3)为45 dBm的接收机指标。采用MCM(Multichip Module)技术实现了接收机小型化的硬件设计,并用改进的测试方法进行了测试,验证了此接收机良好的动态范围特性。

Two strong signals would produce third order intermodulation components which would interfere with the work of the receiver when they are received by the receiver.In order to reduce the interference,thus increasing spurious free dynamic range of the receiver,a receiver channel with large dynamic range is proposed.By properly distributing the gain of the channel and suitable component selection,the 3rd-order Output Intercept Point(OIP3)is achieved to 45 dBm.The multichip module(MCM)technology is applied to establish the hardware of the receiver.The receiver is tested by an improved test method,verifying the its excellent dynamic range.