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设计了针对解决900MHz RFID读写器收发机芯片中本地载波干扰问题而优化的直接变频接收机,并在0.18μm 1P6M混合信号CMOS工艺上实现验证.设计中使用了一种串联反馈结构的基带放大器以达到同时实现无源混频器输出缓冲,直流消除以及信号放大的功能.实际测量显示,该接收机的输入1dB压缩点为-4dBm,当中频信号解调信噪比要求为10dB时,可达到的灵敏度为-70dBm.该接收机与整个收发机集成在同一块芯片中,使用1.8V电源电压,工作时静态电流为90mA.
A direct conversion receiver optimized to solve the problem of local carrier interference in a 900MHz RFID reader transceiver chip is designed and verified in a 0.18μm 1P6M mixed-signal CMOS process. A baseband amplifier with series feedback structure is used in the design In order to achieve the function of passive mixer output buffer, DC cancellation and signal amplification at the same time.The actual measurement shows that the receiver input 1dB compression point is -4dBm, when the intermediate frequency signal demodulation signal to noise ratio requirements of 10dB, The sensitivity achieved is -70dBm. The receiver and the entire transceiver integrated in the same chip, the use of 1.8V supply voltage, quiescent current 90mA.