摘要
针对在测距过程中超声波的能量损耗和回波信号微弱的问题,在分析问题产生的基础上,利用可变增益放大器AD8338设计了超声波自动增益控制(AGC)接收补偿电路,动态范围达到80 d B。实验结果表明:该自动增益补偿电路结构简单,不需要额外的控制器件,可以使不同距离的超声波回波信号维持在合适的幅度范围内,有效地解决了回波信号衰减等问题,提高测距精度。
Considering ultrasonic attenuation and small echo signal during ultrasonic transmission,this paper analysed the root cause,and designed 80 d B large dynamic range auto gain control circuit for ultrasonic compensation with variable gain amplifier AD8338.Experimental results show that the AGC circuit is simple and don’t need other control units.In addition it can effectively compensate the ultrasonic attenuation,and improve the system precision.
出处
《电子器件》
CAS
北大核心
2017年第3期597-601,共5页
Chinese Journal of Electron Devices
基金
国家863计划项目(2013AA041101)
