An Area-efficient Wideband CMOS Hall Sensor System for Camera Autofocus Systems
Journal
IEEE A-SSCC
Pages
1月5日
Date Issued
2016
Author(s)
Abstract
This paper presents an area-efficient and fast-response CMOS Hall sensor system for a camera autofocus system. The prototype comprises of a Hall sensor and a capacitively-coupled instrumentation amplifier (CCIA). The Hall sensor adopts the spinning current technique to mitigate the Hall element offset. In the CCIA, the T-capacitor network is employed considering the capacitor matching requirement and the chip area. The amplifier offset is further suppressed by a ripple-reduction loop. This chip is measured with Helmholtz coil, Solenoid, and NMR system. Implemented in a 0.18-μm CMOS process, it achieves 564 μT rms in 180-kHz BW. The linearity error is 2 .
SDGs
Type
conference paper