RF至数字接收机的信号链噪声分析

从射频元件开始至ADC的全系统设计时，噪声特性在各部件之间并不是始终一样的。本文就不同术语之间的转换进行分析。射频工作者可以使用这些信息来设计他们系统的拓扑结构和元件选择以提高灵敏度。SignalChainNoiseAnalysisforRF-to-DigitalReceiversDesignNote439Cheng-WeiPeiIntroductionequaltoanNFofapproximately14dB),sohereweuseNF.Designersofsignalreceiversystemsoftenneedtoper-Whenworkinginaxed-impedance(50Ω)environment,formcascadedchainanalysisofsystemperformanceusingNFsimpliestheanalysisofanRFsignalchain.fromtheantennaallthewaytotheADC.Noiseisacriti-However,iftheassumptionsofconstantimpedanceandcalparameterinthechainanalysisbecauseitlimitsthepropersource/loadterminationarenotvalid,thenNFov