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分析了共用跨导级的正交下变频混频器的性能,包括电压转换增益、线性度、噪声系数和镜象抑制比,分析表明其在电流开关模式下比传统的Gilbert混频器对具有更好的性能.设计并优化了一个基于共用跨导级结构的用于超高频RFID阅读器的正交下变频混频器.在915MHz频段上,该混频器测得12.5dB的转换增益,10dBm的IIP3 ,58dBm的IIP2和17.6dB的SSB噪声系数.芯片采用0.18μm 1P6M RF CMOS工艺实现,在1.8V的电源电压下仅消耗3mA电流.
The performance of a common transconductance quadrature downconversion mixer is analyzed, including the voltage conversion gain, linearity, noise figure and image rejection ratio. The analysis shows that in the current switching mode, Better performance. A quadrature downconversion mixer for UHF RFID readers based on a common transconductance-based architecture was designed and optimized. At 915MHz, the mixer measures 12.5dB conversion gain , IIP3 of 10dBm, IIP2 of 58dBm and SSB noise figure of 17.6dB.The chip adopts 0.18μm 1P6M RF CMOS craft to realize, only consume 3mA electric current under 1.8V power supply voltage.