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User name Bo
Log entry time 21:02:32 on April 21, 2009
Entry number 267257
keyword=adjustment of Retiming signal delay
With the fixed delay cable of retiming signal, the ADC gate is a little
later, because S1/S2 ADC signals come about 20ns later than ADC gate.
This is too tight. I replaced a 50ns cable of retiming signal with a 20ns
cable, which means that there is about 50ns between the S1/S2 ADC signals
and ADC gate.
Here are the time difference between ADC signals and the ADC gate:
ADC gate ~ shower 150 ns
ADC gate ~ Pre-shower 130 ns
ADC gate ~ S1/S2 50 ns
since the ADC gate is 400 ns wide, it should be good enough to cover ADC
signals.