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Categorisation of the remaining MCMs

Categorisation of the remaining MCMs. Victor Andrei. Kirchhoff-Institut für Physik Ruprecht-Karls-Universität Heidelberg. L1Calo Trigger Joint Meeting, CERN, 21/10/2011. MCM Spares. 2. L1Calo Trigger Joint Meeting, CERN, 21/10/2011. Victor Andrei, KIP.

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Categorisation of the remaining MCMs

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  1. Categorisation of the remaining MCMs Victor Andrei Kirchhoff-Institut für Physik Ruprecht-Karls-Universität Heidelberg L1Calo Trigger Joint Meeting, CERN, 21/10/2011

  2. MCM Spares 2 L1Calo Trigger Joint Meeting, CERN, 21/10/2011 Victor Andrei, KIP • CERN: 300 spares (fully tested in Heidelberg) • 237 in the test rig • 63 in USA15 • Heidelberg: 531 spares (validated during production tests) • 501 currently/previously operated on PPMs • 30 “factory-new” • Heidelberg: many returns from CERN • failed only DAC/Pedestal tests at CERN  passed again similar tests in Heidelberg • re-test & re-use them if necessary Categorisation of the remaining MCMs

  3. MCM Categorisation 3 L1Calo Trigger Joint Meeting, CERN, 21/10/2011 Victor Andrei, KIP • >1 year to operate with the current MCM • test all ‘Heidelberg spares’ and sort them in three categories: • GOOD MCMs • flawless operation • USABLE MCMs • small deviations from expectation, but still functional • BAD MCMs • large deviation or severe errors  no usable spares • digital part • either GOOD or BAD • “mixed-signal” part (ADC, PHOS4) • more complex & critical  requests the USABLE category Categorisation of the remaining MCMs

  4. Test Platforms @KIP 4 L1Calo Trigger Joint Meeting, CERN, 21/10/2011 Victor Andrei, KIP Single PPM Tests (short-term & systematic checks) Categorisation of the remaining MCMs Full Crate Tests (long-term operation)

  5. Testing Applications 5 L1Calo Trigger Joint Meeting, CERN, 21/10/2011 Victor Andrei, KIP • large collection of testing and debugging applications that verify: • operating conditions (temperatures & voltages) • ASIC configuration, readback and readout • gain, offset and linearity of the ADCs • stability of the PHOS4 operation • real-time LVDS output • based on the existing applications for testing the PPMs • added the experience gained with the running PPr system in USA15 Categorisation of the remaining MCMs

  6. Observed Errors (1/6) 6 L1Calo Trigger Joint Meeting, CERN, 21/10/2011 Victor Andrei, KIP • so far fully tested 48 MCMs (i.e. 3 PPMs) • for other 48 MCMs tests are in progress • in general results are good • most of the observed errors are well-known • one digital error: ASIC LoadLUT command fails in one channel • should generate a ramp in LUT according to predefined Slope and Pedestal parameters • no calibration slope is loaded • LUT configuration over VME works properly ! • observed similar error on other MCMs (<10-15) in the past years  “weak” point in the design enhanced during manufacturing ? • keep an eye on it when porting the ASIC code to the FPGA of the new MCM Categorisation of the remaining MCMs

  7. Observed Errors (2/6) 7 L1Calo Trigger Joint Meeting, CERN, 21/10/2011 Victor Andrei, KIP • mixed-signal area is more critical • several effects observed • FrameBit effect • FrameBit  digital signal sent by ReM FPGA to all ASICs • improper analogue-digital ground decoupling in MCM layout • spikes in ADC data every 13 BCs (FrameBit period) Categorisation of the remaining MCMs pedestal measurements

  8. Observed Errors (3/6) 8 L1Calo Trigger Joint Meeting, CERN, 21/10/2011 Victor Andrei, KIP • consequences of the FrameBit effect: • increased noise content • large number of multiple peaks in ADC (pedestal) distributions • most affected: the two ADCs located near the ASIC • worse results for certain PHOS4 delay settings • ADC strobe positioned on the maximum of the noise amplitudes Categorisation of the remaining MCMs

  9. Observed Errors (4/6) 9 L1Calo Trigger Joint Meeting, CERN, 21/10/2011 Victor Andrei, KIP bottom • also, worse results through the upper part of the PPM • effect of the temperature • thermal (top-bottom) gradient on the PPM • increase in thermal noise with temperature • thermal noise adds with the analogue-digital coupling noise top Categorisation of the remaining MCMs top bottom

  10. Observed Errors (5/6) 10 L1Calo Trigger Joint Meeting, CERN, 21/10/2011 Victor Andrei, KIP • MCMs operated in the central part of the PPM show additional noise component • slightly longer signal path from the AnIn boards to the respective MCM slots • additional coupled noise • more visible on the channels with ADCs far from ASIC (less affected by FrameBit effect) Categorisation of the remaining MCMs

  11. Observed Errors (6/6) 11 L1Calo Trigger Joint Meeting, CERN, 21/10/2011 Victor Andrei, KIP • FrameBit effect is responsible for most of the damage • verification: • disable the FrameBit transmission from ReM to ASICs  digital activity on the PPM is reduced • noise level drops considerably • still visible a probable coupling of the 40 MHz clock signal Categorisation of the remaining MCMs

  12. Conclusions 12 L1Calo Trigger Joint Meeting, CERN, 21/10/2011 Victor Andrei, KIP • observed misbehaviours in the mixed-signal part affect all MCMs and are not changeable • none of the tested MCMs is “ideal” (GOOD) • all are USABLE • the experience gained with the current design will be used for the new MCM • the MCM showing the ASIC LoadLUT error will be entered in the BAD category • summary of testing: • 47 USABLE MCMs • 1 BAD MCM Categorisation of the remaining MCMs

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