2.45 GHz有源标签接收机中的下变频混频器

A Down-Conversion Mixer for 2.45 GHz Active Tag Receiver

设计了一种用于2.45GHz有源标签接收机的低中频正交下变频混频器。改进了传统的吉尔伯特结构,采用了共享跨导正交结构和电流注入技术,以提高混频器的增益,减小混频器的噪声。该混频器采用UMC 0.18μm CMOS工艺设计。仿真结果表明,该混频器在1.8V电压下,电流消耗为3.1mA,转换增益为17.18dB,输入1dB压缩点Pin-1dB与输入3阶截点IIP3分别为-13.5dBm,-3.23dBm,在2MHz中频下的噪声系数为14dB。

A low-IF quadrature down-conversion mixer applied for 2.45 GHz active tag receiver was designed.An architecture of shared transconductance quadrature stage and a kind of current injection technique were introduced to increase conversion gain and to reduce noise figure after improving classic structures of Gilbert.The proposed mixer was implemented in UMC 0.18μm standard CMOS process.Simulation results showed that the mixer consumed a current of 3.1 mA under 1.8 Vsupply voltage.It achieved a conversion gain of 17.18 dB,a Pin-1dBof-13.5dBm,an IIP3of-3.23 dBm,a noise figure of 14 dB at 2 MHz intermediate frequency.