Segmented Hybrid DPWM and tunable PID controller for digital DC-DC converters

Abstract

This paper proposes the design of a 10-bit Segmented-Hybrid Digital Pulse Width Modulator (DPWM) featuring a counter with segmented delay lines and an tunable digital Proportional-Integral-Derivative (PID) controller for digital DC-DC converters using AMS 0.35μm CMOS process. On the basis of simulations, the proposed DPWM dissipates ~55% lower power than the Hybrid DPWM with small area overhead (~8%). When compared to the Counter-Comparator DPWM, the proposed DPWM features significant power reduction (14.9×) at moderate area overhead (1.86×). The proposed tunable PID controller features superior transient response - ~68.9% faster settling time and ~23.6% less undershoot than the conventional PID controller.