Digital pulse-width modulation controller based on fully table look-up for system-on-a-chip applications

• Published in: IET power electronics 2013-11, Vol.6 (9), p.1778-1785
• Main Authors: Tu, Steve Hung-Lung, Chiu, Morris M.-H
• Format: Article
• Language: English
• Subjects: Analogue; analogue comparator; analogue‐digital conversion; analogue‐to‐digital conversion; Comparators; Conversion; DC‐DC power convertors; Digital; digital control; digital error process unit; fully table look‐up digital pulse‐width modulation controller; fully table look‐up multiphase DPWM controller; high‐frequency DC–DC buck conversion; large chip‐area multipliers; Modulation; multiplying circuits; PID compensation function; programmable memory; Proportional integral derivative; prototype test chip; pulse width modulation; storage management chips; System on chip; system‐on‐a‐chip applications; table lookup; table look‐up multiphase approach; Tables (data); three‐term control; word length 1 bit
• ISSN: 1755-4535; 1755-4543; 1755-4543
• DOI: 10.1049/iet-pel.2012.0659

Design and implementation of a fully table look-up digital pulse-width modulation (DPWM) controller for high-frequency DC–DC buck conversion is presented. The controller comprises a 1 bit analogue comparator, a digital error process unit and a fully table look-up multi-phase DPWM. The interface of analogue-to-digital conversion is performed with the analogue comparator. Moreover, the proposed programmable memory is based on the table look-up multi-phase approach for the functions of the proportional-integral-derivative (PID) compensation, which alleviates the penalty of using large chip-area multipliers. As a result, the approach is very suitable for system-on-a-chip (SOC) implementation. A prototype test chip is realised to validate the mechanism of the proposed architecture.