Time-Based PWM controller for fully integrated high speed switching DC-DC converters-an alternative to conventional analog and digital controllers

Qadeer A. Khan, Seong Joong Kim, Pavan Kumar Hanumolu

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

Abstract

This tutorial discusses design of a highly integrated, low quiescent current continuous time PWM controller using time-based signal processing. By virtue of the continuous-Time digital nature of the time-based PWM controller, it is capable of achieving very high resolution and speed without using any error amplifier and large compensation capacitor or any high resolution A/D converter and digital PWM while preserving all the benefits of both analog and digital PWM controllers. Using time as the processing variable, the controller operates with CMOS-level digital-like signals but without adding any quantization error. A voltage/current controlled ring oscillator is used as an integrator in place of conventional opamp-RC or Gm-C integrator while a voltage/current controlled delay line is used to perform voltage-To-Time conversion. Starting with trade-offs with high speed design of conventional analog and digital PWM controllers, the concept of time based proportional-integral-derivative (PID) controller with complete architecture of a time-based buck converter is presented. The technique was successfully demonstrated on silicon with implementation of 10-25MHz single phase and 30-70MHz 4-phase buck converters on 180nm and 65nm CMOS processes, respectively.

Original languageEnglish (US)
Title of host publicationProceedings - 31st International Conference on VLSI Design, VLSID 2018 - Held concurrently with 17th International Conference on Embedded Systems, ES 2018
PublisherIEEE Computer Society
Pages226-231
Number of pages6
ISBN (Electronic)9781538636923
DOIs
StatePublished - Mar 27 2018
Event31st International Conference on VLSI Design, VLSID 2018 - Pune, India
Duration: Jan 6 2018Jan 10 2018

Publication series

NameProceedings of the IEEE International Conference on VLSI Design
Volume2018-January
ISSN (Print)1063-9667

Other

Other31st International Conference on VLSI Design, VLSID 2018
CountryIndia
CityPune
Period1/6/181/10/18

Keywords

  • Buck converter
  • Dc-dcconverter
  • Digital pulse width modulation (DPWM)
  • High switching frequency
  • PID controller
  • Power management
  • Pulse width modulation (PWM)
  • Ring oscillator.
  • Timebased control
  • VCO-based control
  • VCO-based integrator
  • Voltage controlled delay line (VCDL)
  • Voltage controlled oscillator (VCO)
  • Voltage regulator

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering

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  • Cite this

    Khan, Q. A., Kim, S. J., & Hanumolu, P. K. (2018). Time-Based PWM controller for fully integrated high speed switching DC-DC converters-an alternative to conventional analog and digital controllers. In Proceedings - 31st International Conference on VLSI Design, VLSID 2018 - Held concurrently with 17th International Conference on Embedded Systems, ES 2018 (pp. 226-231). (Proceedings of the IEEE International Conference on VLSI Design; Vol. 2018-January). IEEE Computer Society. https://doi.org/10.1109/VLSID.2018.67