Weak signal readout circuit for radiation detector
A radiation detector and weak signal technology, which is used in radiation measurement, amplifiers and instruments with only semiconductor devices, etc., to achieve the effects of high readout accuracy, simple structure, and low power consumption and low noise requirements.
Active Publication Date: 2019-11-15
XIANGTAN UNIV
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[0012] The structure of the above-mentioned classic readout circuit is simple, and the output charge is large (generally tens of thousands of e - The above) detectors can realize signal readout, but for the output and its weak detectors, the above architecture shows certain limitations
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[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0032] Such as image 3 As shown, a weak signal readout circuit for a radiation detector includes a charge amplification circuit and a filter shaping circuit. The filter shaping circuit includes a filter and a baseline stabilization circuit. The input terminal of the charge amplification circuit is connected to the radiation detection The output end of the filter is connected, the output end of the charge amplification circuit is connected with the input end of the filter, and the output end of the filter outputs a read signal, and the input end of the baseline stabilization circuit is connected with the output end of the filter and the reference voltage, and the baseline The output of the stabilization circuit is connected to the input of the filter.
[0033] Such as Figure 4As shown, the charge amplification circuit includes a first MOS transistor ...
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The invention discloses a weak signal readout circuit for a radiation detector. The circuit comprises a charge amplification circuit and a filter shaping circuit. The filter shaping circuit comprisesa filter and a baseline stabilizing circuit. The input end of the charge amplification circuit is connected with the output end of the radiation detector; the output end of the charge amplification circuit is connected with the input end of the filter, the output end of the filter outputs readout signals, the input end of the baseline stabilizing circuit is connected with the output end of the filter and reference voltage, and the output end of the baseline stabilizing circuit is connected with the input end of the filter. The circuit comprises a charge amplification circuit and a filter. Thecharge amplification circuit is used for accurately amplifying a weak charge signal output by the detector; and the filter is used for converting the amplified charge signal into a voltage signal, andcan keep the baseline basically not drifted when the leakage current of the detector is changed from 10pA to 10nA and the temperature is changed from-40 DEG C to 40 DEG C, so that low-noise readout of an ultra-weak signal output by the detector is realized.
Description
technical field [0001] The invention relates to a signal readout circuit, in particular to a weak signal readout circuit for a radiation detector. Background technique [0002] Radiation detection systems are widely used in space detection, high-energy physics experiments, biomedical imaging, security inspection and other fields. The radiation detection system mainly includes a radiation detector and the corresponding front-end readout electronic system. The radiation detector can convert high-energy particles or high-energy radiation into a pulse current signal. The charge carried by the pulse current is its effective signal, and the front-end readout electronic system It is responsible for reading out these charge signals, and the performance of the front-end readout electronic system will directly affect the performance of the entire radiation detection system. [0003] The topology of a classic front-end readout circuit is a charge-sensing amplifier + shaping filter, su...
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IPC IPC(8): H03F3/16G01T7/00
CPCG01T7/00H03F3/16
Inventor 唐明华周焱李正兰燕
Owner XIANGTAN UNIV