Magnetically-coupled Current Sensor Using An Integrated Coil And A Cmos Split-drain Transistor

Fernando C. Castaldo; Carlos A. dos Reis Filho

doi:10.18618/REP.2006.3.233238

Authors

Fernando C. Castaldo Departamento de Engenharia Elétrica, Universidade Estadual de Londrina-UEL, Campus Universitário Cx. Postal 6001 CEP 86051-990 Londrina-PR
Carlos A. dos Reis Filho Departamento de Instrumentação, Semicondutores e Fotônica, Universidade Estadual de Campinas-UNICAMP, Av. Albert Einstein 400 CEP 13085-844 Campinas-SP

DOI:

https://doi.org/10.18618/REP.2006.3.233238

Keywords:

current measurement, Magfet, noise, split-drain

Abstract

An integrated current sensing circuit intended for Smart-Power and embedded applications featuring galvanic isolation is implemented. It is based on magnetic detection using the CMOS compatible Split- Drain transistor (MAGFET) that provides a very linear output current versus magnetic field. The current to be sensed flows through an integrated coil placed atop the split-drain transistor and produces a relatively strong magnetic coupling enough to cause a detectable transistor unbalance current. An integrated sensor built in 0.35ìm CMOS technology presented an output conversion factor of 1500nA/A and a minimum detectable magnetic field around 1ìT within 1Hz bandwidth in thermal range for 100ìA transistor bias current.

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Author Biographies

Fernando C. Castaldo, Departamento de Engenharia Elétrica, Universidade Estadual de Londrina-UEL, Campus Universitário Cx. Postal 6001 CEP 86051-990 Londrina-PR

received the Ms. Eng. degree in Electrical Engineering from Federal University of Santa Catarina in 1994 and the Dr. Eng. degree from Campinas State University in 2005. Currently he is a teacher and researcher at Londrina State University. His areas of research include Microelectronics, Electronic Instrumentation and Power Electronics.

Carlos A. dos Reis Filho, Departamento de Instrumentação, Semicondutores e Fotônica, Universidade Estadual de Campinas-UNICAMP, Av. Albert Einstein 400 CEP 13085-844 Campinas-SP

received both the Ms. Eng. and the Dr. Eng. degrees in Electrical Engineering from Campinas State University. Currently he is a professor and researcher at Campinas State University. His areas of research include Microelectronics and Electronic Instrumentation.

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