Abstract: We present a new hybrid digital pulse-width modulator (DPWM) for digital DC-DC converters that employs a ring-oscillator/counter structure.Based on a temperature/process compensation technique and a novel digital controller, the proposed DPWM can not only offer temperature/process-independent pulse widths, but also operate at a much higher clock frequency than the existing delay-line/counter DPWM structure.Post-simulation results show that with our DPWM, the system clock frequency reaches 156.9MHz while the worst variation, in a temperature range of 0 to 100℃ under all process corners, is only ±9.4%.

Key words: DPWM, ring oscillator, DC-DC converter