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<p>Hi Devi and everyone, <br>
</p>
<p>During Thursday's integrating detector meeting, I stated the
wrong dynamic range for the integrating detector electronics
chain. <br>
The various dynamic ranges (+- 2.048, +- 4.096, Vpp 8.182) that
have been used in various presentations and documents can be <br>
very confusing, so I wanted to write a short email that clarifies
the situation:</p>
<p>1) The drawing below illustrates what the LMH5401 amplifier (see
schematic below) on the preamp board does (roughly), where the 12
uA is the signal from the PMT anode.</p>
<p>2) The ADC input needs a positive signal on both differential
inputs and has a dynamic voltage range of 0 -> 4.096 V on each
input. <br>
</p>
<p>3) The front-end to the ADC adds an offset of +2.048 V on each
ADC input, which means we are limited to a +- 2.048V amplitude on
each differential amplitude line.</p>
<p>4)<b> This means that we can have anode currents that are
consistent with a single line signal amplitude of +-4.096 V and
a peak-to-peak signal swing of maximally 8.182 V.</b><br>
</p>
<p>5) The stated gain of the preamplifier applies to both
differential lines. <br>
</p>
<p>I apologize for the confusion my statements may have caused on
Thursday.<br>
</p>
<p>Cheers,</p>
<p> Michael <br>
</p>
<p><br>
</p>
<p><br>
</p>
<p><img src="cid:part1.P60lRj4S.MN2ZxwAn@umanitoba.ca" alt="" width="549" height="234"></p>
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<img src="cid:part2.MAB59IOH.yFX20HfF@umanitoba.ca" alt="" width="867" height="500"></pre>
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