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Serial Powering of Pixel Modules

Serial Powering of Pixel Modules. T. Stockmanns , P. Fischer, O. Runolfsson and N. Wermes. Why serial powering?. or. Power consumption. Every ATLAS - pixel module needs: 2 supply voltages:. 6 power lines per module. 1 HV bias connection 3 ground lines. cable costs. cable size.

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Serial Powering of Pixel Modules

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  1. Serial Powering of Pixel Modules T. Stockmanns, P. Fischer, O. Runolfsson andN. Wermes Tobias Stockmanns, Universität Bonn

  2. Why serial powering? or Tobias Stockmanns, Universität Bonn

  3. Powerconsumption • Every ATLAS - pixel module needs: • 2 supply voltages: 6 power linesper module • 1 HV bias connection • 3 ground lines Tobias Stockmanns, Universität Bonn

  4. cable costs cable size cable mass Cable Total distance: 152 m Maximum voltage drop: 6.5 V Optimum: No cables at all Tobias Stockmanns, Universität Bonn

  5. Parallel Powering • For a stave of 13 modules: • power + sense lines: 104 • supply voltage: 2 V / 1,7 V • supply current: 26 A • power consumption: 47 W • + voltage drop: 226 W Tobias Stockmanns, Universität Bonn

  6. 26 V VDD readout VDDA 24 V 24 V readout 20 V shuntregulator linear regulator 2 V readout 0 V Alternative: Serial Powering • For a stave of 13 modules: • power + sense lines: 2 • supply voltage: 26 V • supply current: 2 A • power consumption: 52 W • + voltage drop: 65 W Tobias Stockmanns, Universität Bonn

  7. Pros and Consof both concepts Tobias Stockmanns, Universität Bonn

  8. Shunt regulators • 10 shunt regulators built with commercial ICs • All of them operated in series • 2 modified to work with the required voltage • water cooled Tobias Stockmanns, Universität Bonn

  9. Parallel readout of 2 serially powered modules Tobias Stockmanns, Universität Bonn

  10. No influence on module performance Serial powered Parallel powered Threshold: 4700 e- Dispersion: 480 e- Noise: 150e- / 250 e- Threshold: 4330 e- Dispersion: 300 e- Noise: 148 e- Tobias Stockmanns, Universität Bonn

  11. Integration of regulators in newest FE-chip shunt regulator and linear regulator implemented and tested in the newest radhard version of the FE-chip Tobias Stockmanns, Universität Bonn

  12. Threshold measurement 4 FE-I chips in parallel 1 + 2 chips in series Threshold: 4680 e- Dispersion: 100 e- Noise: 264 e- Threshold: 4780 e- Dispersion: 105 e- Noise: 268 e- Tobias Stockmanns, Universität Bonn

  13. Serial PoweringSensorless Module • 13 working chips • 37120 working pixels typ. Threshold: 4800 e- Dispersion: 1340 e- 1200 e-(untuned!) Noise: 214 e- 160 e- Tobias Stockmanns, Universität Bonn

  14. Summary • Serial Powering of pixel detectors seems to be possible: • Feasibilityof serial powering proven with external regulators • Regulators implemented into the new radiation hard FE-chips • Internal regulators tested on single chips and modules • electrical performance very similar hope that the differences in noise disappear with new version of regulators • Next steps: • Using several modules in a series • Measuring the performance of the modules depending on different situations • Testing possible failure scenarios Tobias Stockmanns, Universität Bonn

  15. 14 V 16 V 2 V 4 V 6 V 8 V 10 V 12 V 14 V 16 V 2 V 4 V 6 V 8 V 10 V 12 V „On Module“ – Serial Powering • On each side of a module the FE-chips are connected in series Current consumption goes down by a factor of 8 with an 8-times higher voltage • Opposite FE-chips are on the same DC-potential Tobias Stockmanns, Universität Bonn

  16. „On Module“ – Serial Powering • Implementation: • AC-couplingbetween FE-chips and MCC necessary • Special sensor designnecessary • Disadvantage: • More complicated module design • Advantages: • low current consumption • no risk of loosing a chain of modules • individual module operation like in parallel powering Tobias Stockmanns, Universität Bonn

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