基于AD8321的程控射频宽带放大器设计  

Design of Program-Controlled RF Broadband Amplifier Based on AD8321

作　　者：谢家祖 张翠萍[1] XIE Jiazu;ZHANG Cuiping(College of Electronic and Communication Engineering,Tianjin Normal University,Tianjin 300387,China)

机构地区：[1]天津师范大学电子与通信工程学院,天津300387

出　　处：《通信电源技术》2023年第4期28-30,共3页Telecom Power Technology

基　　金：教育部第二批新工科研究与实践项目(E-DZYQ20201408);教育部产学合作协同育人项目(202101024012、202102172014);天津师范大学校级教改项目(JG01221085)。

摘　　要：研究以运算放大器芯片AD8321作为核心的程控射频放大电路。该系统由AD8321、微控制器电路以及信号均衡电路组成。为保证放大器的增益范围,核心放大电路由三级放大器级联组成。为实现带宽内增益平坦度,级间设计插入信号均衡电路,增益大小由微控制器通过串行接口对AD8321进行设定。实现了程控增益0~60 dB可调,1~80 MHz带宽内增益起伏小于1 dB,最大输出电压正弦波有效值大于1 V,输出信号波形无明显失真。This paper mainly studies the program-controlled RF amplifier circuit with operational amplifier chip AD8321 as the core.The system consists of AD8321,microcontroller circuit and signal balancing circuit.In order to ensure the gain range of the amplifier,the core amplifier circuit is composed of three amplifier cascades.In order to achieve gain flatness in bandwidth,an interstage signal equalization circuit is designed.The gain size is set by the microcontroller through the serial interface to the AD8321.The Radio Frequency(RF)broadband amplifier with programmable gain adjustable from 0 to 60 dB,gain fluctuation less than 1 dB within the bandwidth of 1 to 80 MHz,maximum output voltage sine wave RMS greater than 1 V,and no obvious distortion of output signal waveform is realized.

关 键 词：运算放大器 微控制器 信号均衡电路 射频宽带放大器 

分 类 号：TN722[电子电信—电路与系统]