Session 2-5

A Spurious-Free Switching Buck Converter Using
a Delta-Sigma Modulation Controller
with a Scalable Sampling Frequency

 

Abstract

This switching DC-DC buck converter uses a delta-sigma-modulator controller with a scalable sampling frequency, in order to eliminate the spurs and minimize the noise floor at its output without sacrificing the power efficiency. Fabricated in 0.13-µm digital CMOS, it achieves a spurious-free output with voltage ripples below 70mV over the full loading range (2mA to 800mA). Furthermore, its power efficiency is higher than 72% over this range, with 96% peak efficiency.