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本文设计了使用CMOS工艺 ,单片集成的L波段数字声广播 (DAB)接收机模拟前端 .接收机前端应用了三种方法来提高镜像抑制度 :低中频双正交weaver结构比一般的同相 /正交 (I/Q)两路下变频结构具有更高的镜像抑制能力 ;镜像抑制低噪声放大器 (LNA)提供了额外的镜像信号抑制 ;具有相位和幅度校正功能的本振驱动器提供了更精确的正交本振信号 .仿真显示接收机前端对镜像信号的抑制超过 6 5dB ,其级联噪声指数为 4dB ,输出三阶交调指数为 2 2dBm .接收机前端使用TSMC 0 .2 5 μmCMOS工艺制作 ,版图核心面积为 9mm2 ,目前正在测试中 .
This paper designs a L-band DAB receiver analog front end using a CMOS process and a monolithic integration.The receiver front-end uses three methods to enhance the image rejection: the low-IF biorthogonal weaver architecture has a lower average in-phase / The quadrature (I / Q) downconversion architecture provides higher image rejection; the image rejection LNA provides additional image rejection; the local oscillator driver with phase and amplitude correction provides more accurate Of the orthogonal local oscillator signal simulation shows that the receiver front-end mirror signal suppression of more than 65dB, the cascade noise figure of 4dB, the output of the third-order intermodulation index of 22dBm receiver front-end using TSMC0.25μmCMOS process Production, layout core area of 9mm2, is currently under test.