Title :
Stacked-chip Implementation of On-Chip Buck Converter for Power-Aware Distributed Power Supply Systems
Author :
Onizuka, Kohei ; Kawaguchi, Hiroshi ; Takamiya, Makoto ; Sakurai, Takayasu
Author_Institution :
Inst. of Ind. Sci., Univ. of Tokyo, Tokyo
Abstract :
An on-chip buck converter which is implemented by stacking chips and which is suitable for on-chip distributed power supply systems is proposed and the operation is experimentally verified for the first time. The manufactured converter achieves the maximum power efficiency of 62% for an output current of 70 mA with a switching frequency of 200 MHz with a 2times2 mm on-chip LC output filter. The active part and the passive LC output filter are implemented on separate chips fabricated in 0.35-mum CMOS and connected with metal bumps. The optimization and improvement of the power efficiency and implementation structure are also discussed.
Keywords :
CMOS integrated circuits; low-power electronics; passive filters; power convertors; power supply circuits; CMOS fabrication; chip fabrication; current 70 mA; frequency 200 MHz; metal bumps; on-chip LC output filter; on-chip buck converter; passive filter; power-aware distributed power supply system; size 0.35 mum; size 2 mm; stacked-chip implementation; Buck converters; Capacitors; Circuits; Dynamic voltage scaling; Filters; Inductors; Power supplies; Switching converters; Switching frequency; System-on-a-chip;
Conference_Titel :
Solid-State Circuits Conference, 2006. ASSCC 2006. IEEE Asian
Conference_Location :
Hangzhou
Print_ISBN :
0-7803-9734-7
Electronic_ISBN :
0-7803-97375-5
DOI :
10.1109/ASSCC.2006.357868
