Journal
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
Volume 68, Issue 4, Pages 1388-1397Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSI.2021.3052476
Keywords
Isolated amplifier; current/voltage sensing; galvanic isolation; chopper amplifier; magnetic coil; CMOS Hall sensor
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Mitacs
- CMC Microsystems
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The paper introduces a novel galvanic isolated amplifier based on CMOS integrated Hall sensors, which integrates two serially connected Hall-effect sensors and their instrumentation amplifiers using the TSMC 65nm process. The proposed isolation amplifier is validated on a PCB and can be packaged in a chip for industrial applications due to its miniaturized size of isolation components.
A novel galvanic isolated amplifier based on CMOS integrated Hall sensors is presented in this paper. Two serially connected Hall-effect sensors are integrated along with their instrumentation amplifiers using the TSMC 65nm process. A printed-circuit board is employed to validate the proposed isolation amplifier by assembling the chip with chopper modulator, coil driver, miniature coil, variable gain amplifier, and anti-aliasing filter. Because of the miniaturized size of isolation components, this approach can be packaged in chip for industrial applications. This solution replaces the need of bulky/frequency dependent current transformers, complex isolation amplifiers with embedded analog to digital converters, and allows proposed sensors to be used in voltage and current sensing applications. The introduced prototype achieves an input referred offset of 1 mV, 50 dB full-scale signal-to-noise ratio in a 10 kHz bandwidth, and spurious-free dynamic range of 53 dB, while satisfying continuous isolation working voltage of 550 V.
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