微波功率测量中的小信号检测  

Weak signal detection in microwave power measurement

作　　者：冷朋[1] 赵浩[1] 

机构地区：[1]中国电子科技集团公司第四十一研究所,青岛266555

出　　处：《国外电子测量技术》2017年第3期67-69,共3页Foreign Electronic Measurement Technology

摘　　要：现代微波功率测量仪器大多采用基于微波二极管检波方式的微波功率传感器进行功率测量。二极管功率传感器具有功率测量动态范围大、灵敏度高的优点,但在进行微波小信号检测时输出电压非常小,受噪声影响大,非常难以检测。分析了微波功率传感器中影响小信号检测的噪声来源,针对这些影响小信号功率测量的噪声,从检波电路、斩波电路以及数据采集电路等方面综合进行设计,有效地提高了微波小信号的功率测量灵敏度和准确度。应用于新型微波功率测量仪器中,取得了很好的效果。The common techniques used for sensing microwave power are based on diode detectors. The diodes used for detecting microwave power feature the advantages of wide dynamic range and high sensitivity. But when a low power lev- el microwave signal is applied to a diode detector, the output is a DC or low-frequency voltage with very low amplitude, which is effected greatly by all kinds of noise. This paper firstly discussed the diversity of noise resources. And then ac- cording to these causes, several weak signal detecting techniques are integrated to sensor the low power level in a creative way. The innovative methods involve the detecting circuits, chopping amplifier and data acquisition and so on. The re- sults show these methods can dramatically improve the microwave power measurement sensitivity and accuracy. These methods have been deployed into a new model power measurement instrument and the effects are obviously great.

关 键 词：小信号检测 二极管检波 斩波 噪声 

分 类 号：TM933.3[电气工程—电力电子与电力传动] TN98[电子电信—信息与通信工程]