Title :
On-Chip Voice-Coil Motor Driver for Mobile Auto-Focus Camera Applications
Author :
Yang, Sung-Hyun ; Sohn, Sung-Min ; Hong, Kuk-Tae ; Lee, Hyoung-Soo ; Sohn, Bo-Ik
Author_Institution :
Div. of Syst. IC Bus., LG Electron., Seoul
Abstract :
On-chip voice-coil motor (VCM) driver for mobile auto-focus (AF) camera applications is proposed and integrated into image signal processor (ISP) satisfying small size and low-power consumption. In order to control the location of AF lens, a charge pump (CP) or digital-to-analog converter (DAC) can be selected. Since a large current is required to drive the VCM, the buffer amplifier was inserted after charge pump or DAC. On-chip VCM driver is fabricated using a commercial 0.18 mum CMOS technology. As the result, the chip shows the fast speed enough to operate with 30-fps image signal processor and the quiescent current consumption of 0.32-mA
Keywords :
CMOS integrated circuits; cameras; digital-analogue conversion; driver circuits; image processing equipment; low-power electronics; 0.18 micron; 0.32 mA; CMOS technology; auto-focus lens; buffer amplifier; charge pump; digital-to-analog converter; image signal processor; mobile auto-focus camera applications; on-chip voice-coil motor driver; Charge pumps; Digital cameras; Driver circuits; Energy consumption; Focusing; Frequency; Lenses; Mobile handsets; Signal processing; System-on-a-chip;
Conference_Titel :
Asian Solid-State Circuits Conference, 2005
Conference_Location :
Hsinchu
Print_ISBN :
0-7803-9162-4
Electronic_ISBN :
0-7803-9163-2
DOI :
10.1109/ASSCC.2005.251817
