A DC-DC digitally controlled buck regulator utilizing multi-bit Σ-Δ frequency discriminators

Hani Ahmad, Bertan Bakkaloglu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

This paper describes a novel feedback digitization architecture for a digitally controlled PWM DC-DC buck converter. A multi-bit Σ-Δ frequency discriminators (MB-SDFD) is used. This multi-bit parallelization technique is an extension to the first-order Σ-Δ frequency discriminators (SDFD) concept. SDFD concept is based on a non-feedback Σ-Δ modulator that uses FM signal as its input and it outputs stream of bits (ones and zeros) with quantization noise being first-order shaped similar to the traditional Σ-Δ modulators. The output of the multi-bit discriminator is decimated to obtain a higher resolution depending on the output ripple specifications. A block diagram and a behavioral model are presented along with simulation results. Based on 1% allowed output voltage ripple, an 8-bit ADC resolution is achieved using a reference clock frequency of 1MHz. This architecture is flexible and scalable and can fully be implemented in standard digital CMOS.

Original languageEnglish (US)
Title of host publication2008 23rd Annual IEEE Applied Power Electronics Conference and Exposition, APEC
Pages1543-1548
Number of pages6
DOIs
StatePublished - Aug 18 2008
Event2008 23rd Annual IEEE Applied Power Electronics Conference and Exposition, APEC - Austin, TX, United States
Duration: Feb 24 2008Feb 28 2008

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC

Other

Other2008 23rd Annual IEEE Applied Power Electronics Conference and Exposition, APEC
CountryUnited States
CityAustin, TX
Period2/24/082/28/08

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ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Ahmad, H., & Bakkaloglu, B. (2008). A DC-DC digitally controlled buck regulator utilizing multi-bit Σ-Δ frequency discriminators. In 2008 23rd Annual IEEE Applied Power Electronics Conference and Exposition, APEC (pp. 1543-1548). [4522930] (Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC). https://doi.org/10.1109/APEC.2008.4522930