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提出了900 MHz频段下射频识别(RFID)读写器芯片射频前端接收器混频器模块,给出了读写器芯片的前端混频电路结构。采用单平衡无源混频器的特殊结构,降低了载波泄漏的干扰,后级接跨阻放大器,抑制了后级电路的噪声。通过电路内部复数反馈可以控制接收机等效输入阻抗实部与虚部的变化,进行阻抗匹配,省去了片外匹配网络。在SMIC 0.13μm CMOS混和信号工艺下进行流片。测试结果表明,核心模块的电源电压为3 V,电流为7.3 mA,混频器的转换增益为21.8 dB,输入1 dB压缩点为-5.11 dBm,IP3为4.6 dBm,芯片核心面积为0.83 mm×0.56 mm。
The RF front-end receiver mixer module of RFID reader chip is proposed in 900 MHz band, and the front-end mixer circuit structure of the reader-writer chip is given. The use of a single balanced passive mixer of the special structure to reduce the interference of carrier leakage, after the cross-resistance amplifier connected to suppress the noise of the circuit after class. Through the internal complex feedback circuit can control the receiver input impedance real part and imaginary part of the change, the impedance matching, eliminating the need for off-chip matching network. The slides were run on a SMIC 0.13μm CMOS mixed signal process. The test results show that the power supply voltage of the core module is 3 V, the current is 7.3 mA, the conversion gain of the mixer is 21.8 dB, the input 1 dB compression point is -5.11 dBm, the IP3 is 4.6 dBm and the chip core area is 0.83 mm × 0.56 mm.