真对数放大器原理及特性分析  

Theory of True Logarithmic Amplifier and Analysis of Its Characteristics

作　　者：陆一[1] 何卫国[1] 

机构地区：[1]西南电子设备研究所,成都610036

出　　处：《微电子学》2011年第1期48-52,共5页Microelectronics

摘　　要：提出了利用真对数放大器扩展数字接收机动态范围的方法。对真对数放大器的双音互调特性及其DBF应用进行仿真验证。结果表明,真对数放大器在保留输入信号幅度、相位信息等特性的情况下,把较大的输入功率范围压缩成较小的功率范围,从而实现了比采用线性放大器的接收机更大的动态范围。但是,其较强的非线性效应影响了它在宽带数字接收机中的广泛应用。Techniques to improve dynamic range of digital receivers with true logarithmic amplifier were presented.Characteristics of dual-tone inter-modulation of the true logarithmic amplifier and its application in DBF were simulated.It has been shown that the true logarithmic amplifier compressed the power range while keeping amplitude and phase characteristics of the input signal,to achieve a wider dynamic range than linear amplifiers do.However,the strong effect of nonlinearity limits its application to wideband digital receivers.

关 键 词：真对数放大器 双音互调 数字接收机 

分 类 号：TN95[电子电信—信号与信息处理] TN97[电子电信—信息与通信工程]