Difference: AMC13DebugLog (57 vs. 58)

Revision 5818 Jun 2013 - BenjaminBDickens

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META TOPICPARENT name="CmsSlhc"
Please log AMC13 test activity below, blog style (new entries at top)
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2013-06-13 dickens

  • AMC13XG and TTT frequency range tests:
    • Found the upper limit of clock frequency manageable by AMC13XG to be 85.1 MHz. Periodic "gaps" of constant amplitude voltage appear in the AMC13XG signal thereafter. These gaps become more frequent as the clock frequency increases.
Added:
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      • Setup is identical to setup notated by "2013-06-11 dzou, hazen," but with variable frequency outputted by the AWG.
 
    • Found the upper limit of clock frequency manageable by TTT to be 124 MHz, which is where jitters begin. Jitters become more pronounced around 125 MHz and the TTT loses lock by 125.7 MHz.
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      • The setup for this test maintains all connections of the previous test, but for one exception. The B channel of the TTT is connected to itself, creating a feedback loop, rather than connected to the AMC13 TTC port by 4ft fiber.
 

2013-06-12 dzou

  • Additional test runs made for investigating clock phase shift:
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2013-06-11 dzou, hazen

  • Measuring TTC Clock Phase Shift - Notes on Setup:
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    • Using Agellant AWG 40 MHz 900mV peak to peak output as external clock
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    • Using Agilent AWG 40 MHz 900mV peak to peak output as external clock
 
    • AWG connect by 2 ft onto T on channel 4 of oscilloscope (LeCroy 725 ZI 2.5 GHz)
    • 4ft long cable from T to external clock to TTT
    • D310 differential probe soldered to FClkA on receiver AMC13 at backplane connector w/ 100 ohm between the pair
 
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