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Magnetometer Front-end ASIC (MFA) Magnes 1), W., H. Hauer 2), A. Valavanoglou 1), M. Oberst 2), H. Neubauer 2), D. Pierce 3), J. Means 3), I. Jernej 1),

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Presentation on theme: "Magnetometer Front-end ASIC (MFA) Magnes 1), W., H. Hauer 2), A. Valavanoglou 1), M. Oberst 2), H. Neubauer 2), D. Pierce 3), J. Means 3), I. Jernej 1),"— Presentation transcript:

1 Magnetometer Front-end ASIC (MFA) Magnes 1), W., H. Hauer 2), A. Valavanoglou 1), M. Oberst 2), H. Neubauer 2), D. Pierce 3), J. Means 3), I. Jernej 1), C. Hagen 1), W. Baumjohann 1) and P. Falkner 4) 1) Space Research Institute, Austrian Academy of Sciences 2) Fraunhofer Institute for Integrated Circuits, Germany 3) Institute of Geophysics and Planetary Physics, UCLA, USA 4) European Space Research and Technology Centre, ESA AMICSA-08, 2 nd Sept. 2008 IGPP/UCLA

2 2AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal Magnetometer Front-end ASIC  Overview of System Level Design  Test Results and Performance  Summary of Radiation Tests  MFA-2 Summary Tables  Ongoing Redesign Activities  Application as 4- to 11-Channel Housekeeping ADC  Radiation Hardening Options for Missions to Jupiter  Conclusion

3 3AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal Magnetometer Front-end ASIC  Overview of System Level Design  Test Results and Performance  Summary of Radiation Tests  MFA-2 Summary Tables  Ongoing Redesign Activities  Application as 4- to 11-Channel Housekeeping ADC  Radiation Hardening Options for Missions to Jupiter  Conclusion

4 4AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal Block Diagram of MFA-2  Analog Part: -3 fluxgate channels with LNA -1 housekeeping channel w/mux. -Reference generation -4 spare op-amps  Digital Part: -Primary and sec. decimation filter -4-wire serial synchronous I/F -Command decoder, Clk-generation -Test bus interface

5 5AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal Fluxgate Sensor  Design of IGEP, TU Braunschweig (Germany) -Rosetta, Venus Express, Themis -a) Sensor core: 2 entwined ring-cores with pick-up coils -b) Complete sensor: excitation, pick-up and feedback  Measures magnetic field vector: DC-100 Hz, pT to mT

6 6AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal Fluxgate Signals in Discrete Analog

7 7AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal Delta-Sigma Fluxgate Magnes W, et al. 2003 A sigma-delta fluxgate magnetometer for space applications, Meas. Sci. Technol. 14 1003-1012

8 8AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal Package and Chip Monograph Magnetometer Front-end ASIC (0.35μm CMOS from austriamicrosystems) in a 100-pin CQFP package being soldered to an adapter board Chip micrograph of MFA-2 (ca. 20 mm 2 )

9 9AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal Magnetometer Front-end ASIC  Overview of System Level Design  Test Results and Performance  Summary of Radiation Tests  MFA-2 Summary Tables  Ongoing Redesign Activities  Application as 4- to 11-Channel Housekeeping ADC  Radiation Hardening Options for Missions to Jupiter  Conclusion

10 10AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal Final Test Configuration  MFA EGSE -Interface adapter -Power supply -Connection to host-PC  VEXMAG sensor -IGEP TU-Braunschweig  Test board (ver. 4) -9x6 cm 2

11 11AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal Noise Performance (1/2)  Ideally configured FLUX channel -Noise floor <100 Hz dominated by sensor noise -Increase of quant. noise of 80 dB/dec (gain setting correct) -Harmonic distortion > 95 dB  SNDR and DR of HK channel -Data after prim. decimation filter (128 Hz, fc=30 Hz) -SNDRmax=92 dB -DR=98 dB

12 12AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal Noise Performance (2/2)  MFA-1 (black) vs. MFA-2 (red) -1/f-noise in MFA-1 < 10 Hz -No 1/f-noise in MFA-2 due to Correlated Double Sampling (CDS)  MFA-2 and MMS sensor (UCLA) -Lowest noise level ever measured with this sensor -25 mm ring-cores with twin pick-up system Noise Source: SensorMFAΣΔ

13 13AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal SNDR and Dynamic Range  Housekeeping Channel -128 Hz, fc=30 Hz: SNDRmax=92 dB, DR=98 dB -2 Hz, fc=1 Hz: SNDRmax=98 dB, DR=114 dB  Fluxgate Channels -128 Hz, fc=30 Hz: SNDRmax=85 dB, DR=91 dB -2 Hz, fc=1 Hz: SNDRmax=97 dB, DR=103 dB -Less performance gain at lower frequencies due to 1/f noise of fluxgate sensor

14 14AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal Magnetometer Front-end ASIC  Overview of System Level Design  Test Results and Performance  Summary of Radiation Tests  MFA-2 Summary Tables  Ongoing Redesign Activities  Application as 4- to 11-Channel Housekeeping ADC  Radiation Hardening Options for Missions to Jupiter  Conclusion

15 15AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal Radiation Tests (ESA Facilities)  TID test 1 -2-2 cascaded modulator from Fraunhofer IIS -Up to 115 krad  TID test 2 (MFA-1) -Functional up to 260 krad -Linear drop of SNDR (0.04 dB/krad)  TID test 3 (MFA-2) -Functional up to 300 krad -1/f noise above 130 krad  Single Event Test (MFA-1) -SEL LET TH of 14.1 MeV*cm²/mg -σ SAT of 10 -3 cm 2 /device

16 16AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal TID Test with MFA-2  Fully functional up to 300 krad  Test board was configured in external voltage mode -Fluxgate channels with different ranges and set-ups  Increase of 1/f-noise with TID above 170 krad  All four channels show same behaviour  No difference between internal and external voltage reference  Increased noise disappears after 10 day annealing at room temp.

17 17AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal Magnetometer Front-end ASIC  Overview of System Level Design  Test Results and Performance  Summary of Radiation Tests  MFA-2 Summary Tables  Ongoing Redesign Activities  Application as 4- to 11-Channel Housekeeping ADC  Radiation Hardening Options for Missions to Jupiter  Conclusion

18 18AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal Summary Tables MFA Summary MFA Resource Requirements MFA Performance Characteristics

19 19AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal Magnetometer Front-end ASIC  Overview of System Level Design  Test Results and Performance  Summary of Radiation Tests  MFA-2 Summary Tables  Ongoing Redesign Activities  Application as 4- to 11-Channel Housekeeping ADC  Radiation Hardening Options for Missions to Jupiter  Conclusion

20 20AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal Block Diagram of MFA-3  Redesign is ongoing; Tape-out in Dec. 2008  Modifications in blue (minor) and red (major) -Functional block basically the same as for MFA-2  NASA level 2 qualification in 2009 (Magnetospheric Multiscale Mission)  Proposed for Cross Scale Mission (Cosmic Vision M-class candidate)

21 21AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal Magnetometer Front-end ASIC  Overview of System Level Design  Test Results and Performance  Summary of Radiation Tests  MFA-2 Summary Tables  Ongoing Redesign Activities  Application as 4- to 11-Channel Housekeeping ADC  Radiation Hardening Options for Missions to Jupiter  Conclusion

22 22AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal MFA as General Purpose ADC  The MFA is at the same time a 4- to 11-channel general purpose ADC  Configuration A: -4 channels with 128 Hz data rate -X, Y and Z with flexible input range up to ±10 V and HK (A1) with ±1.25 V  Configuration B: -3 channels with 128 Hz data rate and flexible range (X, Y and Z) -1 channel with 2 Hz and ±1.25 V; 5 channels with 2 Hz and ±0.625 V -2 additional channels measure supply voltage and MFA temp. with 2 Hz

23 23AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal Magnetometer Front-end ASIC  Overview of System Level Design  Test Results and Performance  Summary of Radiation Tests  MFA-2 Summary Tables  Ongoing Redesign Activities  Application as 4- to 11-Channel Housekeeping ADC  Radiation Hardening Options for Missions to Jupiter  Conclusion

24 24AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal Radiation Hardening  MFA-3 is a candidate for a number of missions in the frame of Cosmic Vision: e.g. Cross Scale (MFA-3 as is) and Laplace (radiation hard MFA required). -Latch-up protection circuit is mandatory  It is considered to make future MFA designs fully radiation hard by -either developing a rad-hard digital library for the currently used C35 process from austriamicrosystems -or to transfer the current design to a process with an existing rad-hard, digital library (e.g. UMC 0.18 μm) in the upcoming years.

25 25AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal Magnetometer Front-end ASIC  Overview of System Level Design  Test Results and Performance  Summary of Radiation Tests  MFA-2 Summary Tables  Ongoing Redesign Activities  Application as 4- to 11-Channel Housekeeping ADC  Radiation Hardening Options for Missions to Jupiter  Conclusion

26 26AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal MFA Benefits  Miniaturization  TID hardness  Power consumption  Offset stability with competitive performance!

27 27AMICSA-08, 02 Sept. 2008, Cascais/Sintra, Portugal Acknowledgements  The authors would like to thank the European Space Agency, Advanced Studies and Technology Preparation Division for funding this project under contract no. 18391/04/NL/HB  and the Institute of Meteorology and extraterrestrial Physics, Technical University in Braunschweig/Germany (namely Prof. K.-H. Glassmeier and K.-H. Fornacon) for the support of the MFA project with the fluxgate sensors of the Engineering Model magnetometer developed for the Venus Express mission.


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