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In this paper, a nonlinear model for large signal analysis of resonant inverter (RI) tuning loops with voltage-pump phase-frequency detector is presented. The proposed model employs the resistance multiplication approach, applicable for the circuits containing periodically operated switch. The generic model is valid for both positive and negative phase error values with slight differences. Transient and stability analysis of an RI tuning loop is carried out by employing the presented model. Time-domain expressions for any initial condition are derived as the result of transient analysis. On the other hand, stability analysis reveals the conditions that make the overall system stable. Experimental results, which confirm the theoretical study, are obtained.