智慧农业导刊2025，Vol.5Issue(6)：1-9,9.DOI:10.20028/j.zhnydk.2025.06.001
面向智慧农业多频多模无线通信的宽带射频接收机前端电路设计
摘要
Abstract
Smart agriculture,as a highly modernized novel agricultural model,constitutes a significant support for promoting the development of new-quality productivity in agriculture.Through the collection,transmission,and analysis of a vast amount of agricultural production data,smart agriculture realizes information sharing and collaborative operations.To fulfill the development requirements of low cost,miniaturization,compatibility with multiple communication protocols,high signal fidelity,and low power consumption for wireless communication devices in the Internet of Things(IoT)of smart agriculture,and in view of the application of communication protocols such as 3G/4G/5G,LoRa,NB-IOT,ZigBee,WiFi,Bluetooth,and RFID in the IoT technology of smart agriculture,a front-end circuit of a broadband radio frequency signal receiver that can be compatible with multiple frequency bands and multiple modes of wireless communication mentioned above has been designed.A wideband(0.8～5.2 GHz)CMOS current-mode RF direct downconversion receiver front-end architecture is proposed in this paper,which consists of a low noise transconductance amplifier(LNTA),a passive mixing stage and a transimpedance amplifier(TIA).The low noise transconductance amplifier uses a common gate-common source(CG-CS)parallel structure,noise and distortion cancellation technology and current mirror technology.The passive mixer adopts orthogonal mixing structure and is driven by 25%duty cycle orthogonal local oscillator(LO)signal to avoid the IQ interaction problem and further worsens the linearity and noise of the passive mixer.Compared with the 50%duty cycle switching mixer stage,the down-conversion gain is increased by 3 dB.The gm-boosting technique is adopted in TIA to achieve low input impedance and high gain,which improves the current utilization efficiency and linearity.Simulation results show that the core circuit consumes 24.6 mW,and the prototype receiver achieves approximate 33.5～35.1 dB conversion gain,7.9～9.28 dB NF,and 7.82～9.93 dBm IIP3 from 0.8 to 5.2 GHz.The designed high-performance receiver front-end circuit can be widely applied in various wireless communication device circuits required for the Internet of Things in smart agriculture,facilitating the informatization,intensification,automation,and intelligent upgrading of agricultural production.关键词
智慧农业物联网/无线通信/宽带/电流模式/射频接收机前端Key words
smart agricultural Internet of Things/wireless communications/broadband/current mode/RF receiver front-end分类
电子信息工程引用本文复制引用
陈新菡,张叶茂,刘明,潘宇..面向智慧农业多频多模无线通信的宽带射频接收机前端电路设计[J].智慧农业导刊,2025,5(6):1-9,9.基金项目
广西高校中青年教师(科研)基础能力提升项目"CMOS电流模式射频接收机前端电路的设计与研究"(2022KY1012) （科研）
