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Charge sensitive preamplifier

A preamplifier and charge-sensitive technology, which is applied in the field of nuclear radiation measurement, can solve the problems of not meeting the performance index of ionization chamber equipment, high requirements for charge sensitivity and noise slope, etc., achieve good impedance transformation, improve charge sensitivity, and meet performance requirements The effect of indicators

Pending Publication Date: 2020-01-03
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a charge-sensitive preamplifier to solve the problem that the existing preamplifier cannot meet the requirements of the ionization chamber equipment due to the high requirements of the ionization chamber on the charge sensitivity and noise slope of the charge-sensitive preamplifier. Technical issues with performance indicators

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Embodiment Construction

[0021] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, ...

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Abstract

The invention discloses a charge sensitive pre-amplifier. The charge sensitive pre-amplifier comprises a feedback circuit, a noise reduction circuit, an amplification circuit and a follower circuit, wherein the first end of the feedback circuit receives a detection signal; one end of the noise reduction circuit is connected with the second end of the feedback circuit, and the other end of the noise reduction circuit is connected with one end of the amplification circuit, and the other end of the amplification circuit is connected with the first end of the follower circuit, and the second end of the follower circuit is connected with the third end of the feedback circuit, and the third end of the follower circuit outputs amplified detection signals; the noise reduction circuit can reduce the noise slope of a detection signal; the amplification circuit can amplify the detection signal after noise reduction; the follower circuit can output the amplified detection signal and reduce the impedance of an output signal; and the feedback capacitor can improve the closed-loop gain of the charge sensitive preamplifier. Therefore, by implementing the charge sensitive pre-amplifier, the performance index of the ionization chamber for charge sensitive pre-discharge can be met, and the function of amplifying the output signal of the ionization chamber is realized.

Description

technical field [0001] The invention relates to the technical field of nuclear radiation measurement, in particular to a charge-sensitive preamplifier. Background technique [0002] In nuclear radiation measurement, the signal output by the detector is often small, and an amplifier must be used to amplify the signal before measurement. In order to improve the signal-to-noise ratio of the system and reduce the influence of external interference when the signal is transmitted through the cable, a pre-amplifier is generally used. The amplifier (hereinafter referred to as "pre-amplifier") amplifies the signal output by the detector. At present, there are three types of preamplifiers mainly used in the field of nuclear radiation measurement, namely charge sensitive preamplifier, voltage sensitive preamplifier and current sensitive preamplifier. [0003] Among them, charge-sensitive preamplifiers are usually used in high-resolution energy spectroscopy. Since the output amplitude...

Claims

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Application Information

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IPC IPC(8): H03F1/26H03F1/34G01T1/185
CPCG01T1/185H03F1/26H03F1/34H03F2200/372
Inventor 侯嵩徐建郭昌胜吕佳佩张艳
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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