Title :
A CMOS Magnetic Hall Sensor Using a Switched Biasing Amplifier
Author :
Min, Young-Jae ; Kwon, Chan-Keun ; Kim, Hoon-Ki ; Kim, Chulwoo ; Kim, Soo-Won
Author_Institution :
Sch. of Electr. Eng., Korea Univ., Seoul, South Korea
fDate :
5/1/2012 12:00:00 AM
Abstract :
A compact CMOS magnetic Hall sensor that includes both a Hall plate and readout circuit is proposed. In order to achieve a low-noise and low-power operation, the sensor employs a switched biasing amplifier with a chopper. The prototype has been implemented and fabricated in a high-voltage 0.18 CMOS process and occupies 0.624 mm2. Owing to the switched biasing amplifier, the input-referred noise is reduced from 41 μT√Hz to 25 μT/ √Hz. The entire sensor consumes 4.5 mW with a 3.3 V supply voltage.
Keywords :
CMOS integrated circuits; Hall effect transducers; amplifiers; choppers (circuits); low-power electronics; magnetic sensors; Hall plate; chopper; compact CMOS magnetic Hall sensor; high-voltage CMOS processing; input-referred noise reduction; low-noise operation; low-power operation; power 4.5 mW; readout circuit; size 0.18 mum; switched biasing amplifier; voltage 3.3 V; Magnetic circuits; Magnetic field measurement; Magnetic separation; Modulation; Noise; Switches; Switching circuits; $1/{rm f}$ noise; CMOS; dynamic offset cancellation; magnetic Hall sensor; switched biasing amplifier;
Journal_Title :
Sensors Journal, IEEE
DOI :
10.1109/JSEN.2011.2169055
