A New Mirroring Circuit for Power MOS Current Sensing Highly Immune to EMI

This paper deals with the monitoring of power transistor current subjected to radio-frequency interference. In particular, a new current sensor with no connection to the power transistor drain and with improved performance with respect to the existing current-sensing schemes is presented. The operation of the above mentioned current sensor is discussed referring to time-domain computer simulations. The susceptibility of the proposed circuit to radio-frequency interference is evaluated through time-domain computer simulations and the results are compared with those obtained for a conventional integrated current sensor.

[2]  Calogero Bona,et al.  A New Filtering Technique That Makes Power Transistors Immune to EMI , 2011, IEEE Transactions on Power Electronics.

[3]  Anna Richelli.  Increasing EMI Immunity in Novel Low-Voltage CMOS OpAmps , 2012, IEEE Transactions on Electromagnetic Compatibility.

[4]  Juing-Huei Su,et al.  Integrated current sensing circuit suitable for step-down dc-dc converters , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[5]  Jin Liu,et al.  A 5-MHz 91% Peak-Power-Efficiency Buck Regulator With Auto-Selectable Peak- and Valley-Current Control , 2011, IEEE Journal of Solid-State Circuits.

[6]  Franco Fiori,et al.  Complementary differential pair with high immunity to RFI , 2002 .

[7]  F. Fiori.  Susceptibility of CMOS Voltage Comparators to Radio Frequency Interference , 2012, IEEE Transactions on Electromagnetic Compatibility.

[8]  Ka Nang Leung,et al.  An integrated CMOS current-sensing circuit for low-Voltage current-mode buck regulator , 2005, IEEE Transactions on Circuits and Systems II: Express Briefs.

[9]  Bruno Murari,et al.  Smart Power ICs , 1996 .

[11]  Mark Vesterbacka,et al.  Thermometer-to-binary decoders for flash analog-to-digital converters , 2007, 2007 18th European Conference on Circuit Theory and Design.

[12]  T.H. Hubing,et al.  The Electromagnetic Compatibility of Integrated Circuits—Past, Present, and Future , 2009, IEEE Transactions on Electromagnetic Compatibility.

[13]  B. Jayant Baliga,et al.  Fundamentals of Power Semiconductor Devices , 2008 .

[14]  P.K.T. Mok,et al.  A monolithic current-mode CMOS DC-DC converter with on-chip current-sensing technique , 2004, IEEE Journal of Solid-State Circuits.

[15]  Erhan Ozalevli,et al.  A precision high-voltage current sensing circuit , 2008, IEEE Transactions on Circuits and Systems I: Regular Papers.

[16]  Hoi Lee,et al.  An Integrated Speed- and Accuracy-Enhanced CMOS Current Sensor With Dynamically Biased Shunt Feedback for Current-Mode Buck Regulators , 2010, IEEE Transactions on Circuits and Systems I: Regular Papers.

[17]  Michiel Steyaert,et al.  EMC of Analog Integrated Circuits , 2009 .

[18]  Xinquan Lai,et al.  On-chip CMOS current-sensing circuit for DC-DC buck converter , 2009 .

[19]  P.K.T. Mok,et al.  A 1-V integrated current-mode boost converter in standard 3.3/5-V CMOS technologies , 2005, IEEE Journal of Solid-State Circuits.