Experimental Results of CC2 Charge Sensitive Preamplifier

Experimental Results of CC2 Charge Sensitive Preamplifier

Meeting on GERDA Phase II Front-End Electronics R&D Status on the Fully Integration of the Front-End Electronics Milano Bicocca - 16/4/2010 ASIC designed for the Gerda Experiment - Multi Ch. Fully Integrated CMOS ASIC CSA (Heidelberg, 2007) http://cdsweb.cern.ch/record/1034317/files/p515.pdf - Single Ch. Fully Integrated CMOS ASIC CSA (Milano, 2007) http://www.mpi-hd.mpg.de/gerda/public/2008/c08_IEEE_dresden_cmos_sr.pdf - Single Ch. JFET-CMOS ASIC CSA (Milano, 2007) http://www.mpi-hd.mpg.de/gerda/public/2008/c08_IEEE_dresden_preamp_fc.pdf - Multi Ch. JFET-CMOS ASIC CSA (Milano, 2008) http://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=5401678&queryText %3Dpullia+zocca%26openedRefinements%3D*%26searchField%3DSearch+All - Multi Ch. JFET-CMOS ASIC CSA (Milano, 2009) ASIC Development in Heidelberg

Design Features: - 4 channels - differential voltage output - gain 5.8 mV/fC = 310 mV/MeV (Ge) - dynamic range = 11 MeV (Ge) - integrate feedback C and R - programmable R up to 2 G @LNTLNT - I2C interface for programming - noise (Tsh= 10 s, Cdet= 30 pF) @LNTRT: ENC ~ 220 e 1.5 keV (Ge) @LNTLNT: ENC ~ 110 e (expected) Results: - ASIC works @LNTLNT (77 K) - gain 15% lower, perfect linearity - programmable R worked ! - large noise (Tsh= 10 s, Cdet= 30 pF) @LNTLNT: ENC ~ 500 e - evidence of noise correlation between channels - noise (Tsh= 10 s, Cdet= 30 pF) calculated as (Out1 Out2) / 2 @LNTLNT: ENC ~ 240 e Testboard Kapton with ASIC

Conclusion: - large common mode noise - despite some effort: reason unclear not usable as it is - designer left collaboration stopped ASIC development ASIC Development in Milano Design Features: - 1 channel - fully differential ASIC design - CSA + Fully Differential Amplifier - FDA with differential output (50 ) - power supplies = 2.5 V - power consumption < 50 mW - gain 1 mV/fC = 54 mV/MeV (Ge) - discrete C (for testing) and R - pulsed-reset operation mode (no R) - noise (Tsh = 50 s, Cdet = 33 pF) @LNTRT: ENC ~ 200 e 1.4 keV (Ge) @LNTLNT: ENC ~ 100 e (expected) Results: - ASIC works both at RT and LNT - tested with C = 1 pF and R = 300 M - dynamic range > 20 MeV (Ge)

- shaping time of 50 s is unrealistic - large noise (Tsh = 12 s, Cdet = 33 pF) @LNTLNT: ENC ~ 250 e - energy resolution with SUB det. (Milano 2008, Tsh = 8 s) @LNTLNT: 3 kev @LNT1.33 Mev ( Co) 60 PCB with ASIC Conclusion: - evidence of fundamental noise only - bad design choice of long shaping time determined too a low input p-mos transconductance of 2 mS (vs better then 10 mS of BF862) not usable as it is - in order to concentrate on better CSA stopped development Set-up of the Gerda Experiment L 10 m Electronics

CSA (Flash ADC, ) L 10 m Room Temperature Radioactivity issue: Ge det. (Material Activity * Volume) r2 CSA requirements: Liquid Argon Cryogenic Temperature Bandwidth ( > 10 MHz, 30 ns rise time) Noise (ENC < 150 e @LNTLNT, Tsh =10 s) Power consumption < 50 mW/channel Cross-talk between channels < 1%

Set-up of the Gerda Experiment L 10 m Electronics ??? (Flash ADC, ) L 10 m Room Temperature CSA Radioactivity issue: (Material Activity * Volume) Ge det. r2 CSA requirements:

Liquid Argon Cryogenic Temperature Bandwidth ( > 10 MHz, 30 ns rise time) Noise (ENC < 150 e @LNTLNT, Tsh =10 s) Power consumption < 50 mW/channel Cross-talk between channels < 1% Cryogenic operation Radioactivity issue: (material, distance, volume) Integration = Miniaturization CSA far from detector means: increased noise reduced bandwidth From the viewpoint of the CSA design alone: closer is better increased cross-talk? 100 mm

2 mm Volume reduction 10000 Critical distance reduced by a factor of 100 Silicon Integration easy for: difficult for: (Active Devices) CMOS JFET (available technology?) BJT (not suitable for LNT) (Passive Devices) Resistors (up to a few MOhm) Capacitors (up to a few pF) (Active Devices) Low Noise MOS (P Type) (< 1 nV/Hz eq. voltage noise) (Passive Devices) Resistors (above 100 MOhm) (large area or distortion with CMOS) Capacitors (above 100 pF)

Inductors also to be considered: Interface between ASIC and outside world (bonding wires, glue, PCB, copper shield, connectors, pins, cables, ecc.) Components of a CSA (on paper) not easy to integrate Input Output Complete integration of a CSA with reasonable performances in terms of bandwidth, noise, power consumption, etc. is a difficult task but still possible Components of a CSA (real world) bonding wires connector pins PCB (teflon + copper + gold) cables (teflon + copper)

cables (teflon + copper) Because cables have to be thin, they are far from ideal: High resistivity of central wire ( 1 /m) and shield ( 0.2 /m) High attenuation (10% for 10 m long cables, 50 terminated) Electro-magnetic shielding not so effective (e.g. FM radio in Milano) Low voltage levels on board not perfectly the same as on the outside power supply Components of a CSA (real world) decoupling capacitors Most promising capacitors seems to be tantalum based Number of strictly required decoupling capacitors may change across different CSAs Reasonable values are n = 4 to 10; C = 10 F; (VDC = 6 v) Insufficient LVPS decoupling may generate: noise/instability in single channel CSA noise/instability + cross-talk in multi channels CSA Complex Optimization Problem (example) integrate CSA (less volume) radioactivity thinner cables

(less volume) 3 Ch. CSA (less volume) cross-talk disturbances noise signal integrity LVPS in parallel 50 term. receiver more decoupling capacitors radioactivity Basic scenario to start with L1

L2 L3 10 m (n) (n + 1 + 1) (n + 4 + 1) (n/2n + 4 + 1) 2 + 1 wires 5 + 1 wires 1 wire CSA FE detector noise

CSA bandwidth, noise 5/6 + 1 wires driver not very critical not very critical with receiver is 50 terminated Among open issues are: Single or multi channels (n) CSA Discrete or integrated electronics design For every reasonable configuration, determine radioactivity issue ( L ) Easy to deal with mechanical design Robustness, time, cost receiver

Recently Viewed Presentations

  • Faculty of Education - University of Kalyani

    Faculty of Education - University of Kalyani

    Different types of research in Social Science. Basic, Applied, and Action. Qualitative, Quantitative, and Mixed ... K.K. Philosophical Foundations of Education. Bhattacharayya, D. Education and Philosophy ... CHARUKALA BHAVANUNIVERSITY OF KALYANIDEPARTMENT OF VISUAL ARTS Syllabus for Open Course ...
  • Traffic Flow Models as it Relates to Ordinary Differential ...

    Traffic Flow Models as it Relates to Ordinary Differential ...

    Traffic Flow Models as it Relates to Ordinary Differential Equations ... Arial Tw Cen MT Wingdings Wingdings 2 Calibri Symbol Times New Roman Median 1_Median 2_Median 3_Median 4_Median 5_Median 6_Median 7_Median 8_Median 9_Median 10_Median Microsoft Equation 3.0 TRAFFIC FLOW MODELS...
  • Perseus and the gorgon (medusa) - Your Awesome English Class!

    Perseus and the gorgon (medusa) - Your Awesome English Class!

    Daughter of Acrisius, King of Argos. ... Slayer of Medusa. Medusa. Hideous monster known as a Gorgon. Daughter of Phorcys, a God of the sea, and Ceto, a female sea God. Anyone who looked directly at Medusa was instantly turned...
  • Snímek 1 - WebSnadno.cz

    Snímek 1 - WebSnadno.cz

    Nezůstávejte při čtení v posteli, pohled na budík by vás mohl stresovat. Do postele běžte opravdu unaveni. Suchá pokožka Vysoušení pokožky může být způsobeno ústředním topením a přetopeným prostředím. Dr. Paul Griffiths radí umístit na radiátor nádobu s vodou a...
  • Five Steps to Lean 1. 2. 3. Define

    Five Steps to Lean 1. 2. 3. Define

    Multi-skilled workers facilitate this. Kanban links customer demand to final assembly, and then to internal and external suppliers (synchronization) Changeover time should equal one takt time for final assembly operations If customers order 100 products per day, what is the...
  • Válaszd a Tudást Junior

    Válaszd a Tudást Junior

    A ferdén beeső fényt a beesési irány szögének koszinuszával arányosan értékelje Más spektrális összetételű sugárzók esetén korrekciós szorzókat kell alkalmazni (e nélkül 20-30 %-os mérési hiba is lehet) Legolcsóbb, legegyszerűbb Se fényelem „A" fényforrással (2858 K-es izzólámpa) kalibrálva Fotométerek ...
  • Winning: Foreign Direct Investment 2015-2019 Brendan McDonagh Director

    Winning: Foreign Direct Investment 2015-2019 Brendan McDonagh Director

    Incentive aimed at regeneration of the historic inner cities of Cork, Dublin, Galway, Kilkenny, Limerick and Waterford. Encouraging people back to the centre of Irish cities to live in historic buildings; ... PowerPoint Presentation Last modified by:
  • Hasta Güvenliği - Erciyes Üniversitesi

    Hasta Güvenliği - Erciyes Üniversitesi

    Hasta Güvenliği Prof. Dr. H. Erdal Akalın Cancer patient, 18, critical after drug injection blunder. Daily News 2001; 24 Jan./ 18 yaşında kanser tanısı konmuş bir hasta ilaç verilmesindeki bir karışıklıktan sonra kritik durumda.