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Inspired by Wilkinson ADC method, we implement a fast linear discharge methodbased on FPGA to digitize nuclear pulse signal. In this scheme, we use aconstant current source to discharge the charge on capacitor which isintegrated by the input current pulse so as to convert the amplitude of theinput nuclear pulse into time width linearly. Thanks to the high precision ofTDC measurement that we have achieved in FPGA, we can increase the currentvalue of the discharge to make the discharge time short, so as to obtain asmall measurement of dead time. We has realized a single channel fast lineardischarge circuit which contains only one dual supply amplifier, two resistorsand one capacitor. The rest part can be implemented in an FPGA (FieldProgrammable Gate Array). Leakage current from the sensor would cause the baseline drifting slowly, which can influence the measuring precision. Our methodsolve this problem without losing the linearity of measurement. We have builtthe circuit and experimental setup for evaluation. Using them to measure energyspectrums of PET detectors of PMT coupled with LYSO and LaBr3 crystal, theenergy resolution is 12.67% and 5.17% respectively. The test results show thatour circuit is rather simple, stable and conducive for multi-channelintegration.

An FPGA Based Fast Linear Discharge Method for Nuclear Pulse Digitization