Design of Low Spurious Phase Locked Loop for Vector Network Analyzer

Abstract

In the vector network analyzer, the excitation source signal will produce nonlinear compression after being amplified for many times, resulting in the reduction of spurious rejection ratio. In power measurement, the spurious signal is detected as the main signal, while in narrowband reception, the spurious signal is filtered out and the amplitude decreases on the curve. This paper introduces a method to improve the spurious suppression of excitation signal. The spurious suppression is increased by 18dB.