Title :
Fully integrated digital controller IC for buck converter with a differential-sensing ADC
Author :
Chan, Man Pun ; Mok, Philip K T
Author_Institution :
Dept. of Electron. & Comput. Eng., Hong Kong Univ. of Sci. & Technol., Hong Kong
Abstract :
A low-power and high-speed ADC is crucial in a digital controller IC design. The Self-Strobe Delay-Line (SSDL) ADC architecture has been used because of its low-power and high-speed characteristics. However, the transconductance gain of the V-I converter in the SSDL ADC have not been optimized to have high sensitivity with low power consumption. In this paper, a differential sensing circuit was designed to obtain high transconductance gain without costing extra power and chip area. With the improved ADC, the digital controller IC was implemented with 0.35 mum CMOS process. Measurement results show that the 4 MHz, 600 mA buck converter operates properly with the 50 mV precision ADC and LC value of 2.2 muH and 220 nF.
Keywords :
CMOS integrated circuits; analogue-digital conversion; digital control; low-power electronics; power convertors; power integrated circuits; CMOS process; analog-digital converters; buck converter; capacitance 220 nF; current 600 mA; differential sensing circuit; digital controller integrated circuit; self-strobe delay-line; size 0.35 mum; voltage 50 mV; Buck converters; CMOS digital integrated circuits; CMOS integrated circuits; Costing; Delay; Digital control; Digital integrated circuits; Energy consumption; High speed integrated circuits; Transconductance;
Conference_Titel :
Electron Devices and Solid-State Circuits, 2008. EDSSC 2008. IEEE International Conference on
Conference_Location :
Hong Kong
Print_ISBN :
978-1-4244-2539-6
Electronic_ISBN :
978-1-4244-2540-2
DOI :
10.1109/EDSSC.2008.4760690
