A Versatile Digital Pulsewidth Modulation Architecture with Area-Efficient FPGA Implementation

This paper describes a multi-output digital pulsewidth modulator (DPWM) that generates versatile waveforms suitable for use in a typical multi-phase interleaved switching DC-DC buck converter. A heterogenous DPWM is proposed that achieves a resolution of 255 ps, facilitating multi-megahertz switching frequencies. A novel global architecture is also introduced that exploits the phased nature of the interleaved buck converter, limiting the number of required multiplexers/comparators and enabling a large, adjustable number of variable-frequency pulsewidth modulated outputs to be generated using a small, xed architecture with programmable duty-cycles and dead-times