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A Novel Chopping-Spinning MAGFET Device Vincent FRICK , Huy Binh NGUYEN and Luc HEBRARD

A Novel Chopping-Spinning MAGFET Device Vincent FRICK , Huy Binh NGUYEN and Luc HEBRARD vincent.frick@iness.c-strasbourg.fr. A Novel Chopping-Spinning MAGFET Device Vincent FRICK , Huy Binh NGUYEN and Luc HEBRARD vincent.frick@iness.c-strasbourg.fr. Outline. Introduction on MAGFET

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A Novel Chopping-Spinning MAGFET Device Vincent FRICK , Huy Binh NGUYEN and Luc HEBRARD

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  1. A Novel Chopping-Spinning MAGFET Device Vincent FRICK,Huy Binh NGUYEN and Luc HEBRARD vincent.frick@iness.c-strasbourg.fr A Novel Chopping-Spinning MAGFET Device Vincent FRICK,Huy Binh NGUYEN and Luc HEBRARD vincent.frick@iness.c-strasbourg.fr

  2. Outline Introduction on MAGFET Novel Device’s Principle Experimental Results Conclusions and outlook

  3. MAGFET device Plan • Introduction on MAGFET • Novel Device’s Principle • Experimental Results • Conclusions and outlook W/2 W/2 B L W

  4. Characteristics Pros High sensitivity (optimization possible) Fully compatible with CMOS technology Amplifier input stage Cons Offset 1/f noise =poor resolution Plan • Introduction on MAGFET • Novel Device’s Principle • Experimental Results • Conclusions and outlook

  5. Improvement Plan • Introduction on MAGFET • Novel Device’s Principle • Experimental Results • Conclusions and outlook • Spinning current ? • Only for Hall plates (Hall effect) • Current lines deflection in our case • Chopper stabilization ? • Impossible to swap the “input” signal (intrinsic) • Chopping-Spinning !

  6. Novel Device’s Structure Plan • Introduction on MAGFET • Novel Device’s Principle • Experimental Results • Conclusions and outlook

  7. Chopping-Spinning Principle Plan • Introduction on MAGFET • Novel Device’s Principle • Experimental Results • Conclusions and outlook

  8. Signal conditioning Plan • Introduction on MAGFET • Novel Device’s Principle • Experimental Results • Conclusions and outlook

  9. Amplifying and Output stage Plan • Introduction on MAGFET • Novel Device’s Principle • Experimental Results • Conclusions and outlook • Differential stage gain • Known issues • Limited gain optimization possibilities • Current output: 1/f noise in T-gates Device geometry dependency

  10. Prototype circuit Plan • Introduction on MAGFET • Novel Device’s Principle • Experimental Results • Conclusions and outlook AMS 0.35µm technology MAGFET size: 25x25 µm

  11. Sensitivity and linearity Plan • Introduction on MAGFET • Novel Device’s Principle • Experimental Results • Conclusions and outlook gate voltage Sensitivity: up to 4mA/T

  12. Sensitivity and linearity Plan • Introduction on MAGFET • Novel Device’s Principle • Experimental Results • Conclusions and outlook Linearity: 0.9998 %

  13. Noise performance and resolution Plan • Introduction on MAGFET • Novel Device’s Principle • Experimental Results • Conclusions and outlook

  14. Noise performance and resolution Plan • Introduction on MAGFET • Novel Device’s Principle • Experimental Results • Conclusions and outlook Without chopping-Spinning

  15. Noise performance and resolution Plan • Introduction on MAGFET • Novel Device’s Principle • Experimental Results • Conclusions and outlook With chopping-Spinning 56µT resolution

  16. Conclusions and outlook Plan • Introduction on MAGFET • Novel Device’s Principle • Experimental Results • Conclusions and outlook • Novel device • Simple MOSFET based geometry • Highly linear • Promising performances • Improvements • Geometry • Use as active load in differential stage • Larger T-gates: less 1/f noise

  17. Thank you ! 14th of December 2010 17

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