K5-302
Electro-Opto Readout of a K5 Module
Ashley Greenall
04/11/02
K5-302 Outer Module using Liverpool Support Card
A scheme has been developed to check the feasibility of reading out a K5
module using the Opto Route (DORIC/VDC) remotely. The module is configured
to be elecrically 'remote' from the readout support card, the interconnection
is made via a 5m screened Ethernet cable (for the BPM encoded CLK0/COM0
and Link0/Link1 data streams). The input signals for the DORIC have been
set so that they are switching at 60uA, the DORIC is specified to expect
input signals whose switching range is 60uA - 600uA (for a Logic 1).
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Module mounted in Valencia Cooling Box
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Module mounted directly onto cooling block - no insulation layer added.
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Agnd connection to box.
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No common-mode chokes used.
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Select = 0, Optical data route.
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Nominal ABCD bias settings (FEShp = 30uA, FEBias = 220uA)
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Vdet = 120V, Idet = 0.36uA
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Thybrid = 33C
Opto-Results
As a comparison the tests are repeated but this time using the Redundant
data route with the readout adjacent to the module (no remote interconnection).
Redundant-Results
Conclusion
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K5-302
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Module perfromance is:
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Front-end Input noise, Link0 = 1521e, Link 1 = 1504e; (specification
is <1500e)
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Gain, Link 0 = 50.3mV/fC, link1 = 50mV/fC (specification is 50mV/fC)
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Threshold variation (for TrimRange 0) , Link 0 = 2.01mV, Link 1 = 2.03mV.
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Noise Occupancy, for both Links 1.50x 10-5 - 1.78 x 10-5(specification,
after irradiation is <10-4)
K5-501 Outer Module using Liverpool Support Card
Same configuration as above. Testing using both the Redundant and Electro-Opto
data routes:
Redundant Data Results
Electro-Opto Data Results
Again the Electro-Opto perfromance is not as good when compared to using
the Redundant Data link but this problem is understood (jitter on the decoded
clock from the DORIC) and thus not unexpected.
Conclusion
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Results obtained here in Liverpool again indicate no problems in the electrical
readout of a K5.1 type module.
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Module characteristics are in close agreement with those obtained at CERN
when being readout electrically.
Ashley Greenall 22/10/02