This paper proposes an adaptive pole-zero position (APZP) technique to achieve excellent transient response of dc-dc converters. The APZP technique triggers the two-step nonlinear control mechanism to speed up the transient response at the beginning of load variations. Before the output voltage is regulated back to its voltage level, the APZP technique merely functions as a linear control method to regulate output voltage in order to ensure the stability of the system. Fast transient response

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... me, low output ripples, and stable transient operation are achieved at the same time by the proposed APZP technique. Experimental results in the UMC 0.18-µm process show that the transient undershoot/overshoot voltage and the recovery time do not exceed 48 mV and 10 µs, respectively. Compared with conventional design without any fast transient technique, the performances of overshoot voltage and recovery time are enhanced by 37.2% and 77.8%. With the APZP technique, the performance of dc-dc converters is improved significantly. Index Terms-Adaptive frequency control, current-mode dc-dc converter, fast transient response, load transient, on-chip compensation.