Sample and Hold current.

dick_freebird said:

The S/H is generally just a capacitor, a switch and a buffer. Though
depending on the driven load buffer may be unnecessary - the
settling time will say.

The art is in minimizing the error contribution of the sampling
and holding. Charge injection gives sampling pedestal, leakage
gives "hold droop". Current from the pixel detector has to slew
the hold cap to value well within pixel read time. An active amp
as the source may exhibit "responses" to the switch events and
extend rather than minimize sample settling time. A "sweet spot"
for switch particulars exists, between leakage, settling time and
sampling pedestal and so on, which you'll have to find your way
to. But realize that simply wanting to sample, may impose some
changes on what precedes and follows.

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