Abstract: A photon measurement front-end circuit has an integral module for integrating the difference between an initial signal from a photoelectric detector and a feedback signal, and outputting an integral signal, a comparator for comparing the integral signal with a reference signal and generating a comparison result, a transmission controller for controlling the transmission of the comparison result by using a clock signal, in order to output a digital signal, a negative feedback module for converting the digital signal into the feedback signal and feeding the feedback signal back to the integral module, and a photon measurement module comprising an energy measurement module for measuring, by use of the digital signal, the energy of photons detected by the photoelectric detector. The photon measurement front-end circuit has a simple circuit structure and reduced power consumption and costs, and energy measurement is not affected by the starting time of the initial signal.

Abstract: A photon measurement front-end circuit (200, 400, 800, 900) comprises an integral module (210, 410, 910), a comparator (220, 420, 810, 920), a transmission controller (230, 430, 820, 930), a negative feedback module (240, 440, 830, 940) and a photon measurement module (250, 450, 840, 950). The integral module (210, 410, 910) is used for receiving an initial signal from a photoelectric detector and a feedback signal from the negative feedback module (240, 440, 830, 940), integrating the difference between the initial signal and the feedback signal, and outputting an integral signal. The comparator (220, 420, 810, 920) is used for comparing the integral signal with a reference level and generating a comparison result. The transmission controller (230, 430, 820, 930) is used for controlling the transmission of the comparison result by using a clock signal, in order to output a digital signal.