Title :
A Chopper Stabilized Pre-amplifier for Magnetic Sensor
Author :
Jing, Zhao ; Shuang, Zhang ; Shudong, Chen
Author_Institution :
Coll. of Electron. Sci. & Eng., Jilin Univ., Changchun, China
Abstract :
This paper introduced chopping principle and presented a design of chopper stabilized pre-amplifier for magnetic sensor. Compared with auto-zeroing technique, chopping technique does not fold noise to DC and the noise performance is better. This chopper stabilized pre-amplifier used the integrated instrumentation amplifier AD620 as the main amplifier. It achieved low voltage noise about 10nV/√Hz, and the corner frequency of 1/f noise about 1.5mHz. Residual offset caused by nonidealities of CMOS switch was reduced by a delayed demodulate clock. And the measured result was found to agree well with the simulated result.
Keywords :
1/f noise; CMOS analogue integrated circuits; choppers (circuits); magnetic sensors; preamplifiers; 1/f noise; CMOS switch; auto-zeroing technique; chopper stabilized preamplifier; corner frequency; delayed demodulate clock; integrated instrumentation amplifier AD620; low voltage noise; magnetic sensor; noise performance; residual offset; Choppers (circuits); Clocks; Frequency modulation; Harmonic analysis; Magnetic sensors; Noise; Power harmonic filters; 1/f noise; chopper stabilized; magnetic sensor; pre-amplifier;
Conference_Titel :
Industrial Control and Electronics Engineering (ICICEE), 2012 International Conference on
Conference_Location :
Xi´an
Print_ISBN :
978-1-4673-1450-3
DOI :
10.1109/ICICEE.2012.139
