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A CMOS Magnetic Hall Sensor Using a Switched Biasing Amplifier
- Issue Date
- May-2012
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- 1/f noise; CMOS; dynamic offset cancellation; magnetic Hall sensor; switched biasing amplifier
- Citation
- IEEE SENSORS JOURNAL, v.12, no.5, pp.1195 - 1196
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE SENSORS JOURNAL
- Volume
- 12
- Number
- 5
- Start Page
- 1195
- End Page
- 1196
- ISSN
- 1530-437X
- 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 mu m CMOS process and occupies 0.624 mm(2). Owing to the switched biasing amplifier, the input-referred noise is reduced from 41 mu T root Hz to 25 mu T root Hz. The entire sensor consumes 4.5 mW with a 3.3 V supply voltage.
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