No abstract available

[en] Short note. 2 refs

No abstract available

[en] In nuclear radiation spectroscopy the interconnection between the detector and the preamplifier should be as short as possible. The best solution is building together the detector and the preamplifier. If the detector is placed in a vacuum chamber, e.g. for the detection of light charged particles, this solution - because of cooling problem - is acceptable only if the preamplifier has very low power dissipation. During the development of the low power consumption preamplifier we strowe not to sacrifice either the noise or the speed parameters of the amplifier. This preamplifier is described and its performance is presented. (K.A.)

[en] Conventional design practice in commercial and laboratory ultrasonic instrumentation results in performance which is less than ideal for many advanced applications in research and in automated systems. The major problems with most such instrumentation can be traced to inadequate dynamic range and to baseline distortion arising from AC coupling between stages. This is a preliminary report on an ultrasonic pulser and receiver/preamplifier system having greatly expanded sensitivity and lower noise characteristics in many ultrasonic applications. In at least one application of the new instruments, an improvement of 30 to 40 dB in dynamic range can be achieved

[en] The ex-core NIS(Nuclear Instrumentation System) provides a wide range signal and a narrow range signal. Through preamplifier/filter, discriminator circuit, Logarithmic Count Rate(LCR) circuit, MSV(Mean Square Voltage) circuit, and combination circuit, the wide range power signal is generated to represent the actual power level 2x10^-8% to 200% power. In this paper, the digitalized wide range signal processing procedure of an ex-core NIS of an Integral Reactor is presented

[en] The design criteria of the first fully integrated charge preamplifier completely based on HEMTs, together with few preliminary tests of the circuit, has been already presented by the authors [G. Bertuccio et al., Nucl. Instr. and Meth. A 338 (1994) 582]. In the previous work the circuit was tested directly on wafer using coplanar probes. In this Letter we present a more accurate characterisation of the amplifier, including its noise and linearity. The results here presented have been obtained with the amplifier diced and bonded in a suitable package for low noise applications. (orig.)

[en] The purpose of this paper is to describe a charge sensitive preamplifier designed with the orientation and some general criteria from a course in Nuclear Electronics conducted in West Berlin by IAEA. (author)

[en] The main noise sources of switched integrator preamplifiers are discussed, and their noise performance are given combined PSpice simulation and experiments on them. Then, some practical methods on how to reduce noise of preamplifiers in two different integrator modes are provided. (authors)

[en] A charge-sensitive amplifier with slow (for amplitude measurement) and fast (for time measurement) output is considered. Expressions for signals at these outputs and for spectral densities of noise are obtained. It is shown that the requirement of equality of time constants for feedback and load does not practically effect on the shape of signals from the slow output but it results in occurrence of long tails of comparatively small amplitude in current pulses from the slow output. Formulae for cases of arbitrary impedances of the input circuit, feedback circuits and load are presented. The material is presented based on the principle of superposition