摘要
增益分配作为频谱分析仪等接收机类仪器的一项重要技术,不但可以有效提高动态测量范围等性能指标,而且它还直接决定了中频增益不确定度、显示刻度保真度、参考电平准确度等技术指标。另外它还能够避免信号在仪器的整个通路上产生压缩失真,保证对信号幅度测量的精确度,同时还可以避免混频器、放大器、D/A等器件因为信号幅度过大而遭到损坏。提出了一种新型增益分配方法,简称动态增益分配方法,当频谱仪当前状态发生改变时,会自动对仪器的通道增益进行重新分配校准,保证当前状态下信号幅度等测量的准确度,同时还避免了外界环境变化对仪器测量精度的影响,如温度等。
The technology of gain distribution is very important in the spectrum analyzer.We can improve spectrum analyzer＇s dynamic range by this technology.And the technology of gain distribution also improves performance of the reference level accuracy,display scale fidelity,IF gain uncertainly,and so forth.It can avoid gain compression,protect mixer,amplifier,D/A converter,etc.In the high performance portable spectrum analyzer,we adopt a new method of gain distribution named dynamic gain distribution.When the operating state of spectrum analyzer changed,it can auto distribute the gain of the signal.It can improve metrical veracity used this method,and it also can avoid influence from environment,for example temperature,and so on.
出处
《国外电子测量技术》
2014年第1期36-39,共4页
Foreign Electronic Measurement Technology
关键词
增益分配
增益压缩
参考电平
gain distribution
gain compression
reference level
