The DuAmp - An Alternative Input Configuration For Detector Preamplifiers

1993 IEEE Conference Record Nuclear Science Symposium and Medical Imaging Conference Pub Date : 1993-10-31 DOI:10.1109/NSSMIC.1993.701719

V. Jordanov, G. Knoll, H. Spieler, A. Huber, J.A. Pantazis

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Abstract

An alternative type of detector-preamplifier configuration (DuAmp) has been assembled and tested* . The circuit employs two identical charge sensitive preamplifiers with the detector connected between the two preamplifier inputs. One of the preamplifiers is powered by voltage supplies referenced to ground potential, while the second one is powered by isolated supplies referenced to the bias voltage of the detector. The detector is biased by the voltage difference between the inputs of the two preamplifiers. The output of one of the preamplifiers is inverted and added to the output signal of the other preamplifier. The resultant signal is processed by pulse shaping electronics. For our application, the circuit has been shown to exhibit an overall noise level that is lower than that obtained using an equivalent single preamplifier in a conventional manner. A preliminary analysis of the circuit shows that the improvements are to be expected only in circumstances in which the ratio of detector to preamplifier capacitance is small.

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DuAmp -检测器前置放大器的另一种输入配置

另一种类型的探测器前置放大器配置(DuAmp)已组装和测试*。该电路采用两个相同的电荷敏感前置放大器，检测器连接在两个前置放大器输入之间。其中一个前置放大器由参考地电位的电压电源供电，而第二个前置放大器由参考检测器偏置电压的隔离电源供电。检测器的偏置是由两个前置放大器输入之间的电压差造成的。其中一个前置放大器的输出被反转并加到另一个前置放大器的输出信号中。由此产生的信号经过脉冲整形电子学处理。对于我们的应用，该电路显示出的总体噪声水平低于使用传统方式的等效单前置放大器获得的噪声水平。对电路的初步分析表明，只有在检测器与前置放大器电容之比很小的情况下，才能期望得到改进。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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1993 IEEE Conference Record Nuclear Science Symposium and Medical Imaging Conference

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