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).

Module mounted in Valencia Cooling Box
Module mounted directly onto cooling block - no insulation layer added.
Agnd connection to box.
No common-mode chokes used.
Select = 0, Optical data route.

Nominal ABCD bias settings (FEShp = 30uA, FEBias = 220uA)
Vdet = 120V, Idet = 0.36uA
Thybrid = 33C

Opto-Results

Opto TrimRange
Opto ResponseCurve
Opto NoiseOcc.

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

K5-302
Module perfromance is:

Front-end Input noise, Link0 = 1521e, Link 1 = 1504e; (specification is <1500e)
Gain, Link 0 = 50.3mV/fC, link1 = 50mV/fC (specification is 50mV/fC)
Threshold variation (for TrimRange 0) , Link 0 = 2.01mV, Link 1 = 2.03mV.
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

Redundant TrimRange
Redundant ResponseCurve
Redundant NoiseOcc.

Electro-Opto Data Results

Electro-Opto TrimRange
Electro-Opto ResponseCurve
Electro-Opto NoiseOcc.

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

Results obtained here in Liverpool again indicate no problems in the electrical readout of a K5.1 type module.
Module characteristics are in close agreement with those obtained at CERN when being readout electrically.

Ashley Greenall 22/10/02