Abstract
CMOS Hall sensors are widely used as magnetic sensors due to their linearity and ease of integration [1-3]. Being essentially n-well resistors, their resolution is determined by thermal noise and so decreases with bandwidth (Fig. 11.3.1), limiting their use in wide-band current-sensing applications, such as in switched-mode power supplies, electric motor control and short-circuit detection. In contrast, the differentiating characteristic of pick-up coils means that their resolution actually improves with bandwidth (Fig. 11.3.1). This paper describes a hybrid sensor in standard CMOS that achieves wide bandwidth and good resolution by employing a Hall sensor in a low-frequency (LF) path and a coil in a high-frequency (HF) path. The sensors' outputs are amplified by two transconductance amplifiers (gm,coil and gm,HS) and then combined by a transimpedance amplifier (TIA) (Fig. 11.3.1). The sensor achieves a resolution of 210μTrms in a 3MHz bandwidth; the latter represents an order of magnitude improvement over state-of-the-art CMOS magnetic sensors [1,4].
Original language | English |
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Title of host publication | 2016 IEEE International Solid-State Circuits Conference, ISSCC 2016 |
Subtitle of host publication | Digest of Technical Papers |
Editors | Laura C. Fujino |
Place of Publication | Danvers, MA |
Publisher | IEEE |
Pages | 204-205 |
Number of pages | 2 |
ISBN (Electronic) | 978-1-4673-9467-3 |
ISBN (Print) | 978-1-4673-9466-6 |
DOIs | |
Publication status | Published - 25 Feb 2016 |
Event | 2016 IEEE International Solid-State Circuits Conference, ISSCC 2016 - San Francisco, CA, United States Duration: 31 Jan 2016 → 4 Feb 2016 http://isscc.org/index.html |
Conference
Conference | 2016 IEEE International Solid-State Circuits Conference, ISSCC 2016 |
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Abbreviated title | ISSCC 2016 |
Country/Territory | United States |
City | San Francisco, CA |
Period | 31/01/16 → 4/02/16 |
Internet address |
Keywords
- Magnetic sensors
- Bandwinth
- CMOS integrated circuits
- Coils
- Sensor phenomena and characterization
- Frequency response