Experiments on the analysis of phase/frequency-modulated RF signals using digital tester channels

This paper presents experiments around the analysis of phase/frequency-modulated signals using digital ATE channels. Based on the concept of zero-crossing detection, the proposed technique relies on the sampling of the analog/RF signal through a 1-bit comparator and the post-processing of the resulting bit stream. Coherent under sampling is used to extend the application range of the method, allowing the analysis of high-speed analog signals using standard test equipment operating with a limited sampling frequency. Simulation results show the viability of the technique. Hardware experiments are presented, which are in good agreement with simulation results.