频率变换法在宽频带相位测量系统中的应用

摘要

In order to achieve broadband signal phase measuring,theory of signal transformation is demanded to achieve the frequency transformation of input signal.Based on frequency transformation method, it propounded to select analog multiplier or high-speed analog switching as the core chip in frequency transformation unit of broadband digital phase measuring system frequency transformation.Two design methods are put in actual measuring system, which validates thinking of design method is correct and reliable performance.Especially, frequency transformation circuit is designed by high-speed analog switching, it has many advantages, such as cheap cost, few connected wires, good treatment effect.%为了实现宽频信号的相位测量,需要运用信号变换理论对输入信号的频率进行转换.基于频率变换法分别提出了采用模拟乘法器和高速模拟开关作为核心芯片,对宽频带数字测相系统的频率转换单元进行设计.通过将两种设计方案在实际测量系统中的运用,证明设计方案思路正确、性能可靠.尤其是利用高速模拟开关设计的频率转换电路具有成本低、电路简单、效果好等优点.