Design method of digital filter shaping circuit for radiation detection front-end readout system

A technology of readout system and digital filtering, applied in the fields of electrical digital data processing, computing, special data processing applications, etc., can solve the problems of analog forming circuit design difficulties and other problems

Inactive Publication Date: 2017-11-17
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0013] In order to overcome the shortcomings of the difficulty in designing the analog shaping circuit of the existing front-end readout circuit, the present invention provides a design method for the digital filter shaping circuit of the radiation detection front-end readout system

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  • Design method of digital filter shaping circuit for radiation detection front-end readout system
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  • Design method of digital filter shaping circuit for radiation detection front-end readout system

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Embodiment Construction

[0047] refer to Figure 3-9 . The specific steps of the design method for the digital filter forming circuit of the radiation detection front-end readout system of the present invention are as follows:

[0048] 1. In order to realize the digital shaper, it is necessary to convert the analog transfer function H(s) from the S plane to the Z plane, and adopt the bilinear transformation method, so that Change the formula to:

[0049]

[0050] convert to

[0051]

[0052] Among them, T is the sampling period.

[0053] 2. For high-order semi-Gaussian analog shapers ((CR) m -(RC) n ), and its simulated transfer function is:

[0054]

[0055] Using the bilinear transformation method, the formula (2) is transformed into:

[0056]

[0057] Among them, m and n represent the order of the differential circuit and the order of the integral circuit in the semi-Gaussian shaper, respectively.

[0058] 3. In order to reduce the hardware overhead, the maximum value of the vo...

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Abstract

The invention discloses a design method for a digital filter shaping circuit of a radiation detection front-end readout system, which is used to solve the technical problem that the analog shaping circuit of the existing front-end readout circuit is difficult to design. The technical solution is realized by digital shaping, trapezoidal shaping and peak extraction. First, according to the transfer function of the analog shaper, the bilinear transformation method is used to transform from the S plane to the Z plane; then, according to the output function of the trapezoidal shaper and the input function of the digital shaper, the transfer function is obtained through digital discretization and Z transformation; for The output result of the trapezoidal shape takes the average value of all points on the width of the flat top as the final result. Compared with the analog filter shaping in the analog single-channel front-end readout circuit of the background technology, the present invention adopts a digital method to realize the digital filter shaping circuit, and the design method no longer makes the design of the analog shaper difficult as the size of the CMOS process shrinks, but the sampling digitization method is implemented.

Description

technical field [0001] The invention relates to a design method of a front-end readout circuit, in particular to a design method of a digital filter shaping circuit of a radiation detection front-end readout system. Background technique [0002] refer to figure 1 . The existing front-end readout circuit consists of a preamplifier, a shaper, a peak detection and hold circuit, and an analog-to-digital converter. After the incident particle enters the radiation detector, it interacts with it and converts it into an electrical pulse signal. The electrical signal first enters the preamplifier circuit for amplification processing. Since the signal from the preamplifier is relatively weak, it needs to be shaped and amplified by the shaper for subsequent circuit processing, and then the peak detection and hold circuit tracks the input quasi-Gaussian signal. Pulse signal, and output the peak voltage signal when the input pulse reaches the highest point, and at the same time give t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 高武李超锋高德远魏廷存郑然王佳魏晓敏胡永才
Owner NORTHWESTERN POLYTECHNICAL UNIV
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