Title :
CMOS chopper amplifier for monolithic magnetic hall sensor
Author :
Yang, Wen-Rong ; Ran, Feng
Author_Institution :
Shanghai Univ., Shanghai
Abstract :
This paper describes a highly sensitive CMOS chopper amplifier for a monolithic magnetic hall sensor. It is realized by using chopper stabilization technique to overcome the low frequency noise and drift problems. In order to eliminate the residual offset due to input switching transient spikes, we choose a double track-and-hold (T/H)-based demodulation. This chopper amplifier can effectively eliminate the amplifier input offset, low-frequency input noise components and residual offsets due to input switching spikes, without requiring any low-pass filtering.
Keywords :
CMOS integrated circuits; Hall effect transducers; choppers (circuits); magnetic sensors; CMOS chopper amplifier; chopper stabilization technique; frequency noise-drift problems; low-frequency input noise components; monolithic magnetic hall sensor; residual offsets; switching spikes; Choppers; Demodulation; Frequency; Low-frequency noise; Low-noise amplifiers; Magnetic noise; Magnetic sensors; Sampling methods; Sensor phenomena and characterization; Voltage;
Conference_Titel :
ASIC, 2007. ASICON '07. 7th International Conference on
Conference_Location :
Guilin
Print_ISBN :
978-1-4244-1132-0
Electronic_ISBN :
978-1-4244-1132-0
DOI :
10.1109/ICASIC.2007.4415661