Electromagnetically compatible CMOS auto-balanced current sensor for highly integrated power control System-On-Chip

Author: Frick V.  

Publisher: Taylor & Francis Ltd

ISSN: 1362-3060

Source: International Journal of Electronics, Vol.94, Iss.1, 2007-01, pp. : 9-22

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Abstract

This paper describes the design and prototyping of an auto-balanced contactless current sensor in standard Complementary Metalâ–“Oxideâ–“Semiconductor (CMOS) technology, without any additional post-processing cost. The architecture includes two high-sensitivity Hall plates with differential amplification electronics. A high common mode rejection is insured by the integrated auto-balancing system based on the use of integrated coils. When a common current is applied in the embedded coils, the integrated system provides a feedback signal to a digital control unit which in turn adjusts the biasing current of one of the Hall plates in order to balance the amplification of the two Hall plates. Designed in a standard CMOS technology, this sensor can be integrated in power control System-On-Chip requiring extremely electro-magnetically compatible current sensor.

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