超外差频谱分析仪频率下限扩展技术研究

本文结合超外差频谱分析仪的基本原理对制约其下限频率的因素进行了全面分析,并针对零频响应这一主要因素简要介绍了零频对消技术的原理。通过在产品设计中的应用,取得了良好的效果。

Research on Lower-frequency Extension of Superheterodyne Spectrum Analyzers

Based on the fundamental of superheterodyne spectrum analyzers, this paper comprehensively analyzes the factors, which restrict the frequency range that an analyzer can operate down to. The residual response at 0Hz is the main factor, and the corresponding theory of restraining this residual response is briefly introduced. This theory is used in the applications, and the results indicate that it is effective.