Understanding of self-terminating pulse generation using silicon controlled rectifier and RC load

Recently a silicon controlled rectifier (SCR)-based circuit that generates self-terminating voltage pulses was employed for the detection of light and ionizing radiation in pulse mode. The circuit consisted of a SCR connected in series with a RC load and DC bias. In this paper, we report the investi...

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Bibliographic Details
Published in:AIP advances 2016-01, Vol.6 (1), p.015209-015209-10
Main Authors: Chang, Chris, Alves, Fabio, Karunasiri, Gamani
Format: Article
Language:English
Subjects:
AMPLIFICATION
Bias
CAPACITORS
Circuit design
Circuits
DETECTION
DIRECT CURRENT
ELECTRIC POTENTIAL
Ionizing radiation
MATERIALS SCIENCE
PULSES
RECTIFIERS
SILICON
Silicon controlled rectifiers
VISIBLE RADIATION
Voltage pulses
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Summary:Recently a silicon controlled rectifier (SCR)-based circuit that generates self-terminating voltage pulses was employed for the detection of light and ionizing radiation in pulse mode. The circuit consisted of a SCR connected in series with a RC load and DC bias. In this paper, we report the investigation of the physics underlying the pulsing mechanism of the SCR-based. It was found that during the switching of SCR, the voltage across the capacitor increased beyond that of the DC bias, thus generating a reverse current in the circuit, which helped to turn the SCR off. The pulsing was found to be sustainable only for a specific range of RC values depending on the SCR’s intrinsic turn-on/off times. The findings of this work will help to design optimum SCR based circuits for pulse mode detection of light and ionizing radiation without external amplification circuitry.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4940305