A circuit for readout from for readout from a focal plane array having a number of pixels, includes, for each one pixel, an adaptive photodetector load circuit (15) coupled to a detector for the one pixel, a trans-impedance amplifier (35), the detector being AC coupled to the trans-impedance amplifier, a comparator component, receiving an AC coupled output of the trans-impedance amplifier and comparing the AC coupled output to a predetermined threshold, a sample and hold ring comprising a number charge storage components connected in parallel, each one charge storage component comprising a capacitor (60) in series with an enabling three point switching component (62) and a pulse detection logic circuit receiving an output of the comparator component.