Abstract
Commercial equipment provides phase noise measurement solution for voltage-controlled oscillator (VCO), but it also needs to connect additional tuning voltage for VCO frequency stabilization. If the frequency-drifting VCO cannot be tuned directly, the measurement would be difficult. In this article, we present a prototype of a phase noise measurement system, without any connection for frequency stabilization. The innovation of this work is to compensate the frequency drift by introducing a delayed path. The frequency drift of the signal under test is calculated in advance, and then accurately compensates the delayed signal. The results are compared with commercial equipment, and it shows better performance when measuring frequency-drifting signal directly.
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