1 / 36

Welcome

Welcome. System Test Measurements with Pixel Modules and DC-DC Converters Phase I Pixel Upgrade Workshop Grindelwald , August 2012 Lutz Feld , Waclaw Karpinski , Katja Klein, Jan Sammet , Michael Wlochal. Welcome. Contents. DC-DC Converters for the Phase I Pixel Upgrade

teness
Download Presentation

Welcome

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Welcome System Test Measurements with Pixel Modules and DC-DC Converters Phase I Pixel Upgrade Workshop Grindelwald, August 2012 Lutz Feld, WaclawKarpinski, Katja Klein,Jan Sammet, Michael Wlochal

  2. Welcome Contents • DC-DC Converters for the Phase I Pixel Upgrade • Set-up for System Tests • New Results from System Test Measurements • A feature of previous measurements • Tests with one pair of AMIS2/AMIS4 converters and one pixel module • Tests with four pairs of AMIS4 converters and two pixel modules • Front-end vs. back-end sensing • Occupancy tests with low thresholds • Thermal Cycling of DC-DC Converters – First Results • Summary and Outlook Jan Sammet

  3. Welcome Aachen AMIS4 DC-DC Converters AC_PIX_V8 A 2.8cm x 1.6cm; ~ 2.0g • 4 variants with AMIS4 produced • Version A layout very similar to AMIS2_PIX_V7 • C, D, E: lower mass, smaller ( phase-2) • ASIC: AMIS4 by CERN • Vout: 3.3V and 2.5V • fs = 1.5MHz • Toroidalplasticcoreinductorwith L = 450nH • Pi-filtersat in- andoutput V8 C: small caps 2.8cm x 1.6cm; 1.6-1.7g V8 D: 1.5mm shorter 2.65cm x 1.6cm, ~ 1.6g V8 E: 1mm smallest 2.6cm x 1.5cm; 1.5-1.6g Jan Sammet

  4. Welcome Implementation into CMS • Installation onto supply tube • 24 to 26 DC-DC converters mounted on converter bus board • In total 32 converter bus boards DC-DC converters Pixel detector Bus board with 24 DC-DC converters (w/o shieldings) Jan Sammet

  5. Welcome Tests with 2 Modules and 8 Converters (AMIS2) • System tests based on module qualification set-up • Operated with up to two modules and 8 DC-DC converters • Perform threshold scans and compare s-curve noise with and without DC-DC converters Modules Dynamic digital load I (t) DC-DC converters Const. analogue load Module Module Moduleadapter Moduleadapter 0.17  Connector board Connector board 0.35  CAEN Pixel PS VD VD readout readout SY1527 + Branch Controller EASY 4000 PSM A4603 VD VD 8 DC-DCconverters on common bus board VA VA Long power cables (40m) VA VA HV (150V) Jan Sammet

  6. Welcome Previous Measurements • Hardware configuration: • One pixel module • One pair of AMIS2_V7 / equivalent CAEN PS • Front-end sensing • Results: • Reproduction of previous results • Unintended feature of previous measurements: • Vana is set by measuring analogue current on TB; not in ROC • PreTest sets voltage of analogue regulator on ROC to maximum (Vana = 255) • Larger current through preamplifier reduces sensitivity to intrinsic noise • Small dropout of regulator increases sensitivity to external noise (e.g. orbit gaps) • Measurement under unrealistic conditions Jan Sammet

  7. Welcome New Tests with AMIS2_V7 (S-Curve Noise) • Results: • Reproducibility of identical measurements:0.5e- • Average noise approximately 5e- (3.2%) higher than with Testboard • Almost no difference between CAEN and DC-DC converters • CAEN slightly more sensitive to orbit gaps (noise increased 1e-  0.6%) • Hardware configuration: • Single module • One pair of AMIS2_V7 vs. equivalent CAEN • Front-end sensing • Software configuration: • Trimmed threshold = 60 Vcal DACs • Use Vana and all other parameters from configuration with testboard Jan Sammet

  8. Welcome New Tests with AMIS2_V7 (Threshold) • Results: • Reproducibility of identical measurements:75e- • No significant differences • Hardware configuration: • Single module • One pair of AMIS2_V7 vs. equivalent CAEN • Front-end sensing • Software configuration: • Trimmed threshold = 60 Vcal DACs • Use Vana and all other parameters from configuration with testboard Jan Sammet

  9. Welcome Tests with AMIS4_V8A (S-Curve Noise) • Results: • Noise with AMIS4 slightly lower (1e- / 0.6%) than with AMIS2 • With AMIS4 and (inv.) orbit gaps, no significant increase in noise • With CAEN and const. load no significant increase in noise • With CAEN and (inv.) orbit gaps, noise increases by ~ 1e- (0.6%) • Hardware configuration: • Single module • One pair of AMIS4_V8A / equivalent CAEN • Front-end sensing • Software configuration: • Trimmed threshold = 60 Vcal DACs • Use Vana and all other parameters from configuration with testboard Jan Sammet

  10. Welcome Tests with 8 x AMIS4 (S-Curve Noise) • Results: • With CAEN PS and orbit gaps, noise increases by 36% • With CAEN PS and inv. orbit gaps, noise increases by 10% • No significant increase with constant load • No significant increase with DC-DC converters • Hardware configuration: • Four pairs of AMIS4_V8A / equivalent CAEN • Two modules powered by one converter pair • Plots are from M806 • Front-end sensing • Software configuration: • Trimmed threshold = 60 Vcal DACs • Use Vana and all other parameters from configuration with testboard Jan Sammet

  11. Welcome Tests with 8 x AMIS4 (S-Curve Noise) • Hardware configuration: • Four pairs of AMIS4_V8A vs. equivalent CAEN • Two modules powered by oneconverter pair • Plots are from M1176 • Front-end sensing • Results: • With CAEN PS and orbit gaps, noise increases by 19% • With CAEN PS and inv. orbit gaps, noise increases by 15% • No significant increase with constant load • No significant increase with DC-DC converters • Software configuration: • Trimmed threshold = 60 Vcal DACs • Use Vana and all other parameters from configuration with testboard Jan Sammet

  12. Welcome VA and VD at the Module -2V offset -2V offset -2V offset -2.5V offset -3V offset -3V offset -2V offset -2.8V offset No add load 2A No add load 2A -2V offset Orbit gaps Inv OG -2V offset -2V offset -2V offset -2.8V offset -2.8V offset Orbit gaps Inv OG -2.75V offset -2.65V offset CAEN DC/DC • Hardware configuration: • Four pairs of AMIS4_V8A / equivalent CAEN • Two modules on same converter pair • Observation: • DC-DC converters reduce oscillations • With DC-DC converters VA is hardly affected by load variations on VD • Oscilloscope settings: • VA: 100mV and 20µs per division • VD: 100mV and 20µs per division Jan Sammet

  13. Welcome Tests with 8 x AMIS4 (Threshold) • Hardware configuration: • Four pairs of AMIS4_V8A / equivalent CAEN • Two modules powered by one converter pair • Plots are from M806 • Front-end sensing • Results: • No significant differences • Software configuration: • Trimmed threshold = 60 Vcal DACs • Use Vana and all other parameters from configuration with testboard Jan Sammet

  14. Welcome Tests with Low Threshold / High Occupancy with testboard with CAEN with DCDC • Hardware configuration: • Four pairs of AMIS4_V8A / equivalent CAEN • Two modules powered by one converter pair • Back-end sensing • Plots are from M806 • Results: • Highest noise with TB, lowest with AMIS4: • CAEN to DCDC: +1.6e- = 0.6% • Testboard to DCDC: +5.7e- = 2.3% • Lowest threshold with TB, highest with CAEN • CAEN to DCDC: + 3.7e- (0.3%) • Testboard to DCDC: - 32.9e- (2.3%) • Number of dead/busy pixels similar in all cases • Software configuration: • Trimmed to low threshold (10 Vcal DACs) •  Inefficiencies Jan Sammet

  15. Welcome First Results with Thermally Cycled Converters • Eight converters cycled successfully • Load during cycling: 25 W • In ~10h: 3 x +20°C ... -40°C 10 x +20°C ... -20°C 2 x +20°C ... -10°C 50min @ 0°C • No defects, no problems, no effect on system tests • System tests with converters @ 0°C show no abnormality Jan Sammet

  16. Welcome System Tests after Thermal Cycling TDCDC = 20°C TDCDC = 0°C • Hardware configuration: • Four pairs of AMIS4_V8A • Two modules powered by one converter pair • Plots are from M806 • Results: • No problems observed after thermal cycling • Software configuration: • Trimmed threshold = 60 Vcal DACs • Use Vana and all other parameters from configuration with testboard Jan Sammet

  17. Welcome System Tests after Thermal Cycling TDCDC = 20°C TDCDC = 0°C • Hardware configuration: • Four pairs of AMIS4_V8A • Two modules powered by one converter pair • Plots are from M1176 • Results: • No problems observed after thermal cycling • Software configuration: • Trimmed threshold = 60 Vcal DACs • Use Vana and all other parameters from configuration with testboard Jan Sammet

  18. Welcome Summary and Outlook • Summary • New measurements performed with more reasonable configuration • In all tests AMIS4 DC-DC converters did not cause any additional noise or performance degeneration • AMIS4 converters reduce the impact of fast load variations • We did not encounter any problems operating AMIS4 converters with front-end or back-end sensing of the CAEN PS • After thermal cycling eight converters, none has shown any abnormality • Outlook • Perform measurements with full bus board • Improve monitoring features of cycling software Jan Sammet

  19. Welcome Back-Up Slides Jan Sammet

  20. Welcome Aachen DC-DC Converter “PIX_V7“: ASIC: AMIS2 by CERN Iout < 3A Vin < 12V Vout configurable; 2.5V & 3.3V fs configurable, e.g. 1.3MHz PCB:2 copper layers a 35µm 0.3mm thick Large ground area on bottom for cooling Toroidal inductor: L = 450nH RDC = 40m Pi-filters at in- and output A = 28 x 16 mm2 M  2.5g 3.8% of a radiation length Shield/heat sink Design guidelinesfrom CERN group havebeenimplemented. Jan Sammet

  21. Welcome AMIS4 ASIC Features: • Bandgapand 4 linear regulatorsintegrated • Dead time handlingwith adaptive logic • Triplicationandlogicagainst SEU • Improved power transistor design wrt TID • Over-currentprotection • Over-temperatureprotection • Input under-voltageprotection • State machinefor soft start-upprocedure,handlingofprotectionsignalsandgenerationof “power good“ signal Operating parameters: • Vin < 10V • Iout < 3A (4A @ -30°C) • fs = 1-3MHz • L = 200-500nH Received chips: • 20 bare chips, bonded and packaged in Aachen • 40 chips, packaged by Europractice Jan Sammet

  22. Welcome Reproducibility of Measurements • Standard deviation of individual measurements: ~21e- • Standard error of the means of individual measurements : ~0.08e- • Standard deviation of the mean of four identical measurements: 0.38e- • Fluctuation due to temperature changes (of the coolant): 0.36e-/°C •  Guestimate: expected fluctuations  < 0.38e-  0.36e-  0.5e- • N(T) = T (0.36 ± 0,02) [e-] • ± 1°C  ± 0.36e- [e] [°C] Jan Sammet

  23. Welcome CAEN vs. 2 x AMIS2_V7 • Hardware configuration: • Single module • One pair of AMIS2_V7 vs. equivalent CAEN • Back-end sensing • Results: • With CAEN PS and orbit gaps, noise increases by 23% (75) • With CAEN PS and inv. orbit gaps, noise increases by ~3 • No significant increase with constant load • No significant increase with DC-DC converters • Software configuration: • Trimmed threshold = 60 Vcal DACs • Use Vana and all other parameters from configuration with testboard Jan Sammet

  24. Welcome CAEN vs. AMIS4_V8A • Hardware configuration: • Single module • One pair of AMIS4_V8A vs. equivalent CAEN • Back-end sensing • Results: • With CAEN PS and orbit gaps, noise increases by 23% (75) • With CAEN PS and inv. orbit gaps, noise increases by ~3 • No significant increase with constant load • No significant increase with DC-DC converters •  Same results as with AMIS2_V7 • Software configuration: • Trimmed threshold = 60 Vcal DACs • Use Vana and all other parameters from configuration with testboard Jan Sammet

  25. Welcome Tests with 8 x AMIS4 (S-Curve Noise) • Hardware configuration: • Four pairs of AMIS4_V8A / equivalent CAEN • Two modules powered by two converter pairs • Front-end sensing • Plots are from M806 • Results: • With CAEN PS and orbit gaps, noise increases by 36% • With CAEN PS and inv. orbit gaps, noise increases by 10% • No significant increase with constant load • No significant increase with DC-DC converters • Software configuration: • Trimmed threshold = 60 Vcal DACs • Use Vana and all other parameters from configuration with testboard Jan Sammet

  26. Welcome Tests with 8 x AMIS4 (S-Curve Noise) • Hardware configuration: • Four pair of AMIS4_V8A vs. equivalent CAEN • Two modules powered by two converter pairs • Plots are from M1176 • Front-end sensing • Results: • With CAEN PS and orbit gaps, noise increases by 19% • With CAEN PS and inv. orbit gaps, noise increases by 15% • No significant increase with constant load • No significant increase with DC-DC converters • Software configuration: • Trimmed threshold = 60 Vcal DACs • Use Vana and all other parameters from configuration with testboard Jan Sammet

  27. Welcome CAEN vs. 8 x AMIS4_V8A (M806) • Hardware configuration: • Four pairs of AMIS4_V8A vs. equivalent CAEN • Two modules powered by two converter pairs • Plots are from M806 • Back-end sensing • CAEN measurements with front-end sensing (back-end sensing with CAEN only and large load variations is not feasible) • Results: • No significant increase with constant load • No significant increase with DC-DC converters • Software configuration: • Trimmed threshold = 60 Vcal DACs • Use Vana and all other parameters from configuration with testboard Jan Sammet

  28. Welcome CAEN vs. 8 x AMIS4_V8A (M1176) • Hardware configuration: • Four pairs of AMIS4_V8A vs. equivalent CAEN • Two modules powered by twoconverter pairs • Plots are from M1176 • Back-end sensing • CAEN measurements with front-end sensing (back-end sensing with CAEN only and large load variations is not feasible) • Results: • No significant increase with constant load • No significant increase with DC-DC converters • Software configuration: • Trimmed threshold = 60 Vcal DACs • Use Vana and all other parameters from configuration with testboard Jan Sammet

  29. Welcome 2 x AMIS4 vs. CAEN, Front-End Sensing -3V -3V -2.8V -2.8V -3V -3V -2.8V -2.8V CAEN DC/DC • Hardware configuration: • Single module • One pair of AMIS4_V8A vs. equivalent CAEN • Front-end sensing • System tests: small increase (<1% / ~2) in noise with CAEN and (inv.) orbit gaps • Observation: • Larger oscillations with CAEN • In particular also on VA Jan Sammet

  30. Welcome 2 x AMIS4 vs. CAEN, Back-End Sensing -3V -3V -3V -3V -2.8V -3V -3V -3V CAEN DC/DC • Hardware configuration: • Single module • One pair of AMIS4_V8A vs. equivalent CAEN • Back-end sensing • System tests: smallish increase (~1% / ~3 ) in noise with CAEN and inv. orbit gaps significant increase (23% / ~75 ) in noise with CAEN and orbit gaps • Observation: • Larger oscillations with CAEN • With CAEN PS, oscillations on VA larger than with front-end sensing • However: small difference between iOG & OG Jan Sammet

  31. Welcome 2 x CAEN , Front-End Sensing No add load 2A Orbit gaps Inv OG Jan Sammet

  32. Welcome 2 x CAEN, Back-End Sensing No add load 2A Orbit gaps Inv OG Jan Sammet

  33. Welcome 2 x AMIS4, Front-End Sensing No add load 2A Orbit gaps Inv OG Jan Sammet

  34. Welcome 2 x AMIS4, Back-End Sensing No add load 2A Orbit gaps Inv OG Jan Sammet

  35. Welcome Module Defects • Four not understood module failures (broken TBMs) within four months • Investigated/excluded several possible explanations • In particular ESD and DC-DC converters very unlikely to be the cause • Most likely: EMI of adjacent set-up, when AC connectors (230V) are (dis)connected • Many thanks to W.Erdmann and S.Streuli from PSI for their help! Set-up adjacent to pixel modules Jan Sammet

  36. Welcome Tests with Low Threshold / High Occupancy with testboard with CAEN with DCDC • Hardware configuration: • Four pairs of AMIS4_V8A / equivalent CAEN • Two modules powered by one converter pair • Back-end sensing • Plots are from M806 • Results: • Most dead pixels with Testboard, least with CAEN • CAEN – Testboard = 108.7 • DCDC – Testboard = 93.02 • CAEN – Testboard = 15.68 •  No performance degradation due to DC-DC converters observable • Software configuration: • Trimmed to low threshold (10 Vcal DACs) •  Inefficiencies Jan Sammet

More Related