On-Chip Voice-Coil Motor Driver for Mobile Auto-Focus Camera Applications

On-Chip Voice-Coil Motor Driver for Mobile Auto-Focus Camera Applications

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...

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Bibliographische Detailangaben
Hauptverfasser: Sung-Hyun Yang, Sung-Min Sohn, Kuk-Tae Hong, Hyoung-Soo Lee, Bo-Ik Sohn
Format: Tagungsbericht
Sprache:eng
Schlagworte:
Charge pumps
Digital cameras
Driver circuits
Energy consumption
Focusing
Frequency
Lenses
Mobile handsets
Signal processing
System-on-a-chip
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Beschreibung
Zusammenfassung: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
DOI:10.1109/ASSCC.2005.251817