Abstract
A time-domain method of calculating noise in pulse-amplifying systems, such as those employed in nuclear pulse spectrometry, is presented. The method appears to be generally applicable to linear time-variable systems, where the pulse processing involves a mixture of analogue and digital techniques, as well as to more conventional arrangements, for example those employing single or multiple delay-line shaping, where it greatly simplifies the mathematics. Specific results given here refer to the active integrator system of Kandiah, of which two types have been analysed; in one of these the CR coupling time constant is switched. The latter system, with suitable parameter values, yields a noise/signal ratio only 1.6% greater than the ideal cusp-response amplifier. Noise maps are included for a few cases of interest, since these permit graphical optimisation of system parameters for least resolving time. Consideration is also given to output signal dependence on detector collection time. Full details of the analysis will be published elsewhere.
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