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A Novel Chopping-Spinning MAGFET Device Vincent FRICK , Huy Binh NGUYEN and Luc HEBRARD [email protected]. A Novel Chopping-Spinning MAGFET Device Vincent FRICK , Huy Binh NGUYEN and Luc HEBRARD [email protected]. Outline. Introduction on MAGFET - PowerPoint PPT Presentation
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Institut d’Electronique du Solide et des Systèmes- Strasbourg (France) -
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
A Novel Chopping-Spinning MAGFET [email protected]
2
Outline
• Introduction on MAGFET• Novel Device’s Principle• Experimental Results• Conclusions and outlook
14th of December 2010
A Novel Chopping-Spinning MAGFET [email protected]
3
MAGFET devicePlan
• Introduction on MAGFET
• Novel Device’s Principle
• Experimental Results
• Conclusions and outlook
14th of December 2010
B
WL
W/2
W/2 I D1 I S 2 I 2I D2 I S 2 I 2I D1= I S /2I D2= I S /2
A Novel Chopping-Spinning MAGFET [email protected]
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
14th of December 2010
A Novel Chopping-Spinning MAGFET [email protected]
5
ImprovementPlan
• Introduction on MAGFET
• Novel Device’s Principle
• Experimental Results
• Conclusions and outlook
14th of December 2010
• 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 !
A Novel Chopping-Spinning MAGFET [email protected]
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Novel Device’s StructurePlan
• Introduction on MAGFET
• Novel Device’s Principle
• Experimental Results
• Conclusions and outlook
14th of December 2010
A Novel Chopping-Spinning MAGFET [email protected]
7
Chopping-Spinning PrinciplePlan
• Introduction on MAGFET
• Novel Device’s Principle
• Experimental Results
• Conclusions and outlook
14th of December 2010
I D1 I D1mag I offA I nAI D2 I D2mag I offB I nB
Gate
A B
D C
ID1
ID2
IS
ID1
ID2
IS
ID1ID2
IS
I D1
I D2
I S I D1 I D1mag I offB I nBI D2 I D2mag I offC I nC
I D1 I D1mag I offC I nCI D2 I D2mag I offD I nD
I D1 I D1mag I offD I nDI D2 I D2mag I offA I nA
cteIII DDS 21
III
III
SmagD
SmagD
2/
2/
2
1
A Novel Chopping-Spinning MAGFET [email protected]
8
Signal conditioning Plan
• Introduction on MAGFET
• Novel Device’s Principle
• Experimental Results
• Conclusions and outlook
14th of December 2010
IRVout
A Novel Chopping-Spinning MAGFET [email protected]
9
Amplifying and Output stagePlan
• Introduction on MAGFET
• Novel Device’s Principle
• Experimental Results
• Conclusions and outlook
14th of December 2010
• Differential stage gain
• Known issues– Limited gain optimization possibilities– Current output: 1/f noise in T-gates
PMAGFET
MAGFET
d
dsds
mv gg
gA
Device geometry
dependency
A Novel Chopping-Spinning MAGFET [email protected]
10
Prototype circuitPlan
• Introduction on MAGFET
• Novel Device’s Principle
• Experimental Results
• Conclusions and outlook
14th of December 2010
AMS 0.35µm technologyMAGFET size: 25x25 µm
A Novel Chopping-Spinning MAGFET [email protected]
11
Sensitivity and linearityPlan
• Introduction on MAGFET
• Novel Device’s Principle
• Experimental Results
• Conclusions and outlook
14th of December 2010
Sensitivity: up to 4mA/T
gate voltage
A Novel Chopping-Spinning MAGFET [email protected]
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Sensitivity and linearityPlan
• Introduction on MAGFET
• Novel Device’s Principle
• Experimental Results
• Conclusions and outlook
14th of December 2010
-6 -4 -2 0 2 4 61,97
1,98
1,99
2
2,01
Magnetic field (mT)
Sys
tem
's o
utpu
t vo
ltage
(V
)
Linearity: 0.9998 %
A Novel Chopping-Spinning MAGFET [email protected]
13
Noise performance and resolution
Plan
• Introduction on MAGFET
• Novel Device’s Principle
• Experimental Results
• Conclusions and outlook
14th of December 2010
A Novel Chopping-Spinning MAGFET [email protected]
14
Noise performance and resolution
Plan
• Introduction on MAGFET
• Novel Device’s Principle
• Experimental Results
• Conclusions and outlook
14th of December 2010
Without chopping-Spinning
A Novel Chopping-Spinning MAGFET [email protected]
15
Noise performance and resolution
Plan
• Introduction on MAGFET
• Novel Device’s Principle
• Experimental Results
• Conclusions and outlook
14th of December 2010
With chopping-Spinning
56µT resolution
A Novel Chopping-Spinning MAGFET [email protected]
16
Conclusions and outlookPlan
• Introduction on MAGFET
• Novel Device’s Principle
• Experimental Results
• Conclusions and outlook
14th of December 2010
• 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
