Sensitivity Analysis and Correction of Measuring Small Signal for Spectrum Analyzer

In this paper,the composition and operation principle of a superheterodyne spectrum analyzer are described sim ply.The basic conception of spectrum analyzer sensitivity is discussed.The cal culation formula of sensitivity is derived.The relations of spectrum analyzer s ensitivity and noise figure,resolution bandwidth and RF attenuation are discuss ed.The improvement methods of spectrum analyzer sensitivity are studied by decr easing noise figure,reducing RF attenuation,and reducing resolution bandwidth. Finally,the correction method of the effect of spectrum analyzer floor noise o n small signal measurement is discussed.