宽量程智能射频功率检测系统研究

Study of Wide-range and Intelligent RF Power Detection System 

摘要:

介绍了一种基于数字衰减器HMC274及功率-电压转换芯片AD8362的新型宽量程射频信号功率检测系统；利用微控制器STC12C5A60S2控制HMC274的衰减值,确保被测信号的功率真值在AD8362的线性转换范围内,从而使量程上限提高了31 dB；并通过GSM模块TC35i和LCD显示模块,分别实现了对功率值的远程和近程检测；经过对900 MHz射频信号的实验测试和数据拟合,功率真值量程扩大到了-50～+40 dB,输出灵敏度为50 mV/dBm。

Abstract:

A new wide-range RF power detection system based on digital attenuator HMC274 and power-voltage converter AD8362 is introduced.Using the MCU STC12C5A60S2 to control the attenuation value of HMC274 and making sure the RF true power is within the linearity range of AD8362,so as to increase the upper range value for 31dB.Through GSM module TC35i and LCD display module,the power value can be detected in long and short distances.After the experiment of 900MHz RF signal and data fitting, the result shows the true power detection range has been enlarged from -50dB to +40dB and the output sensitivity is 50mV/dBm.