高增益差分无源N通道带通滤波器的设计  

Design of high gain differential passive N-path band-pass filter

作　　者：盛艳婷 蒋品群[1] 宋树祥[1] 岑明灿 蔡超波 SHENG Yanting;JIANG Pinqun;SONG Shuxiang;CEN Mingcan;CAI Chaobo(College of Electronic Engineering,Guangxi Normal University,Guilin 541004,Guangxi Zhuang Autonomous Region,China)

机构地区：[1]广西师范大学电子工程学院,广西桂林541004

出　　处：《电子元件与材料》2022年第12期1332-1338,共7页Electronic Components And Materials

基　　金：国家自然科学基金(62061005);广西自然科学基金(2022GXNSFBA035646);广西创新驱动发展专项(AA19254001);广西高校中青年教师科研基础能力提升项目(2020KY02028)。

摘　　要：针对传统无源N通道滤波器无增益的问题,采用高增益隐式电容叠加电路的方法,设计了一种高增益差分无源N通道带通滤波器。同时,通过底板电容开关电路来稳定开关的电阻和提高滤波器的线性度,采用差分结构消除偶次谐波对N通道带通滤波器输出信号的影响。采用TSMC 40 nm CMOS工艺,后端仿真结果表明:当通道数为4,电源电压为1.1 V时,滤波器的中心频率可调范围为1.6~2.4 GHz,在频率可调范围内带宽为3.4~7 MHz,噪声系数(NF)小于4.6 dB。当中心频率fs=2 GHz时,电压增益达到26 dB,输入三阶交调点(IIP3)大于22.8 dBm。与同类型的N通道带通滤波器相比,所设计的无源N通道带通滤波器增益较高且线性度较好,可应用于射频接收机前端电路。To address the problems of traditional passive N-path filter with no gain,a high-gain differential passive N-path band-pass filter was designed by adopting a high-gain implicit capacitive stacking circuit.The filter used a capacitive switching circuit on the base plate to stabilize the resistance of the switch and improve the linearity of the filter.In addition,the differential structure was also utilized to eliminate the effect of even harmonics on the output signal of the N-path band-pass filter.Using a TSMC 40 nm CMOS process,the post-layout simulation results show that the central frequency of proposed filter can be tuned between 1.6 GHz and 2.4 GHz with a bandwidth of 3.4 MHz-7 MHz,the noise figure(NF)is less than 4.6 dB,and the noise figure(NF)is less than 4.6 dB at N=4 and supply voltage=1.1 V.When the central frequency f_(s)=2 GHz,the proposed filter also achieves a voltage gain of 26 dB,and the input third-order inter-modulation point(HP3)is greater than 22.8 dBm.Compared with other related works,the proposed passive N-path band-pass filter has higher gain and better linearity and can be applied in the front-end circuit of RF receivers.

关 键 词：N通道滤波器 无源 高增益 差分结构 高线性 电容叠加 

分 类 号：TN432[电子电信—微电子学与固体电子学]