Re: wfd

[Robert M Carey <carey@bu.edu>]

Dear Peter,
    Looking at the circuit and the specs for the flash ADC,
this looks like a DANGEROUS idea. The problem is
that the front end amplifiers will happily drive signals
near to their voltage rails but the flash ADC differential
inputs have an absolute differential maximum of
2 volts, while the full scale is 0.5 volts. If you want
to pursue this idea, I think you should fashion a diode clamp to keep
the input signals in the safe range. If you're not in a rush,
we can have someone try that here.

                                                                Rob

Peter Kammel wrote:

>Dear Rob,
>
>Thus far 15 wfd are running fine, with occasional
>glitches. We would need to get another clock
>divider from MuLan for the last clock signal.
>I will leave this issue to Tim, who will
>certainly have a careful look at the wfd
>performance. Our extender board is in, and
>Genna is ready to make detailed studies
>with Tim, once he arrives on Thursday.
>
>We also are considering to use the wfd
>with our neutron detectors. The dynamic range
>of the neutron detectors would be set to 3.5-4 MeV.
>However, there would also be 10 times higher signals
>coming from Michel electrons running straight
>through the neutron detector.
>Is this dangerous for the wfd? We won't try that
>before getting your advice and ok on this issue.
>
>Many thanks
>
>Peter
>
>  
>