The detection of radiation events usually requires both charge sensitive preamplifiers (CSPs) and shaping amplifiers. The CSP provides a low-noise high-gain input stage, although the pulse shape at the CSP output has an impractical long tail. The following shaping stage serves to quicken the return to the baseline, as well as filtering some of the noise and (often) further amplifying the signal. The figure below illustrates the relationship between the CSP and the following shaping stage:
