Background:The accuracy and real-time performance of pulse amplitude extraction in digital nuclear spectrometer system directly influence the system energy resolution and the maximum count rates.Purpose:This paper attempts to study the amplitude extraction method of digital nuclear signal

which comes from the high speed ADC.Methods:In this paper

according to the principle of operation

the extraction method is categorized into three types:direct comparison method

curve fitting method and filter shaper method

also the operating principle of the three methods are analysed and discussed.Results:The above three methods are employed to process actual sampled digital nuclear signal at the sampling frequency of 40 MHz

the curve fitting method and filter shaper method are respectively used to extract the pulse amplitude and get their energy spectrum.Conclusions:Taking into account the resolution and pulse counting rate

after theoretical analysis

experimental comparison and test

the optimal pulse amplitude extraction method is filter shaper method.