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Production. Yield. Acceptance criteria. Test. PS & SPD LHCb Calo PRR – March 2004 – CERN. I. Yield. According to these results yield is about 85 %. II. Acceptance criteria (I). Possible scenario (using PMT load resistors of 470 ) :

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Production
Production

  • Yield.

  • Acceptance criteria.

  • Test.

PS & SPD LHCb Calo PRR – March2004 –CERN


I yield
I. Yield.

  • According to these results yield is about 85 %.


Ii acceptance criteria i
II. Acceptance criteria (I).

  • Possible scenario (using PMT load resistors of 470):

    • Signal 0 – 25 ns about 76 % and tail 25 – 50 ns about 22 %

    • MIP signal 0 – 25 ns between 83 and 21 mV for PMT uniformity factor of 4 (gain is 1.1 mV/fC).

    • Noise 2 mV r.m.s.

    • SNR for MIP signal is between 40 and 10.

    • Resolution is given by the LSB of the internal DAC, LSB=3.2 mV seems to be enough to cover the offsets of about the 95% of the chips.

    • Resolution between 4 % and 16 %.

  • SNR can be increased if needed with larger PMT load resistors.

  • It is possible to compensate the PMT gain non-uniformities and the ASIC offsets tuning the input resistors.

Offset:

µ = -70

 = 55

DAC:

Offset = 0

LSB = 4

Units are in mV

143

µ+2.5 = 60

µ-2.5 = -200

1 MIP

83 max.

- 63 LSB= -200

63 LSB= 200


Ii acceptance criteria ii
II. Acceptance criteria (II).

  • Defects are found in about 15% of the chips.

  • No special rejection criteria on offset is needed.

  • No rejection criteria on linearity or pile-up correction seems to be needed since all the chips that have been tested are within requirements.

  • A yield >80% is assumed

  • To equip 100 boards, 800 chips are needed.

  • To keep 20% of spare chips, a production of 1250 units is required


Iii test
III. Test.

  • The following points should be included in the test of the complete production:

    • Offset

    • Gain

    • Pile-up correction

    • Digital interface

  • A new VHDL code is under development to accelerate the test (it will include threshold scan algotiyhms).


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