A pulse-processor based on rise time measurement of trapezoidal waveforms by using a count-up ADC

Author

Kuwata, M. ; Maeda, H. ; Husimi, K. ; Ohkawa, S. ; Iwasaki, M. ; Nakamura, S.N. ; Ito, T.M. ; Terada, T.

Author_Institution

JEOL Eng. Co., Tokyo, Japan

Volume

43

Issue

3

fYear

1996

fDate

6/1/1996 12:00:00 AM

Firstpage

1626

Lastpage

1628

Abstract

In order to raise the throughput of low-energy X-ray signals appearing in a background of high-energy pulses, a new pulse-processor that measures the rise time of a trapezoidal waveform instead of the peak height has been developed. A rectangular pre-filter and a gated integrator are used to make the wave-shape at the shaper output linear. A rectangular pulse is formed by adding a differentiated step signal and its integration. The rise time of the trapezoidal waveform is inversely proportional to the height of the input step pulse. Therefore, processing time for a high-energy pulse is shorter than that for low-energy one. Consequently, the pile-up loss of the low-energy X-rays is reduced

Keywords

X-ray detection; analogue-digital conversion; detector circuits; nuclear electronics; count-up ADC; differentiated step signal; gated integrator; high-energy pulse; high-energy pulses; linear wave-shape; low-energy X-ray signals; low-energy X-rays; peak height; pile-up loss; pulse-processor; rectangular pre-filter; rise time measurement; shaper output; trapezoidal waveform; trapezoidal waveforms; Circuits; Degradation; Gamma rays; Mesons; Pulse amplifiers; Pulse measurements; Signal resolution; Signal to noise ratio; Throughput; Time measurement;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.507160

Filename

507160