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Readout Electronics

Readout Electronics. Alexander Karakash MEPhI for DESY. Outline. Comparison of prototype ASIC and final ILC_SiPM Different readout cable/termination resistor options ADC differential non-linearity considerations. Prototype ASIC vs. ILC_SiPM.

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Readout Electronics

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  1. Readout Electronics Alexander Karakash MEPhI for DESY

  2. Outline • Comparison of prototype ASIC and final ILC_SiPM • Different readout cable/termination resistor options • ADC differential non-linearity considerations Alexander Karakash - MEPhI for DESY

  3. Prototype ASIC vs. ILC_SiPM • Test have been performed with two major settings: • Calibration mode: shortest shaping time and highest gain • Physics mode: longest shaping time and “lowest” gain Comparison of calibration mode of different ASIC chips Alexander Karakash - MEPhI for DESY

  4. Calibration mode: gain & linearity Alexander Karakash - MEPhI for DESY

  5. Noise behavior of ASIC chips Alexander Karakash - MEPhI for DESY

  6. Physics mode Comparison of output range linearity for various gain settings Larger ASIC gain give larger dynamic range for the output signal Output range between 1.1–1.6 V  Final gain choice for physics mode after measurement of SiPM response function 160 pC = 1000 pixel (Gain=106) > 150 MIP Alexander Karakash - MEPhI for DESY

  7. Possible problems& Possible solution • With present ASIC settings for calib. mode we had no optimal gain for peak separation • For gain monitoring with ~1% precision • Need larger input signal… … Can be used larger input load resistor (75, 100 W) Alexander Karakash - MEPhI for DESY

  8. 50 W coax cable and no 50 W load resistance Present configuration (50 W resistor) Compared to 75 and 100 W termination • Larger termination R gives larger output signal But … Alexander Karakash - MEPhI for DESY

  9. … problems with reflection With 50 W cable: For increasing cable length (20-100 cm) the reflection decreases the output signal of up to 10%  Use cable of proper resistance Alexander Karakash - MEPhI for DESY

  10. 75 W coax cable and 75 W load resistance • Comparison between 50 and 75 W systems • 50% larger output signal Is it possible to find 75 W 1mm cables? Best would be 91 W cable… Alexander Karakash - MEPhI for DESY

  11. Twisted pair and 100 W resistance Alternative option: Twisted pair (100 W) • Factor 2 larger output signal • Same ASIC noise May be a good suggestion for the tail catcher Investigate pick-up noise for twisted pair system Alexander Karakash - MEPhI for DESY

  12. ADC differential non-linearity Effect of 60% DNL on single ph.e. peaks with 30 ADC ch spacing  Large uncertainty on gain determination  Pessimistic view, but shows the limit of the ADC Final DAQ: 16-bit ADC,150% DNL on 14-bits  Need to optimize linearity range & electronic design to minimize the influence of DNL Alexander Karakash - MEPhI for DESY

  13. Summary & Questions & Remarks • I’m happy! …but Need to optimize readout system: other cable options and termination resistor, choice of most convenient gain for physics mode Need to check interface to DAQ: check effect of DNL, optimize electronic design and tune choice of output range Alexander Karakash - MEPhI for DESY

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