CN211405981U - Radiation detection signal amplification front end based on numerical control gain - Google Patents
Radiation detection signal amplification front end based on numerical control gain Download PDFInfo
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- CN211405981U CN211405981U CN201822113978.5U CN201822113978U CN211405981U CN 211405981 U CN211405981 U CN 211405981U CN 201822113978 U CN201822113978 U CN 201822113978U CN 211405981 U CN211405981 U CN 211405981U
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- detection signal
- analog switch
- operational amplifier
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Abstract
The utility model discloses a radiation detection signal amplifies front end based on numerical control gain, including the multichannel analog switch and resistance and electric capacity, second grade operational amplifier's of the one-level operational amplifier that connect gradually multichannel analog switch and resistance and electric capacity, second grade operational amplifier's of one-level operational amplifier, second grade operational amplifier, FPGA. The final gain is determined by the gain of the first-stage amplifying circuit and the gain of the second-stage amplifying circuit, and the gain is equal to the product of the number of the settable gains of the first-stage amplifying circuit and the number of the settable gains of the second-stage amplifying circuit. By controlling the on-off of the analog switch, the radiation detection signal amplification front end based on the numerical control gain can be realized, and the use under different application conditions is met.
Description
Technical Field
The invention relates to dynamic amplification processing of radiation detection signals, in particular to a radiation detection signal amplification front end based on numerical control gain, and belongs to the technical field of application such as radiation detection and radiation protection.
Background
The radiation detection signal is the basic input for radiation detection digitization, all subsequent circuits are designed around the radiation detection signal, and the processes of signal shaping, amplification, digitization, information processing and the like are included, wherein the amplification front end mainly carries out digitization conversion through an analog-digital converter after conditioning such as amplification and the like on the output signal of the radiation detector which is weak, has a low signal-to-noise ratio and is difficult to be directly digitized by the analog-digital converter.
At present, a device for amplifying a radiation detection signal mainly comprises a low-noise operational amplifier, generally has a specific amplification factor after the design is finished, and can only be used under the condition of a specific occasion. However, when the amplitude and dynamic range of the input signal change, adaptation or accuracy is difficult to guarantee, and the gain cannot be set as required, so that the use requirements of various occasions cannot be met.
Disclosure of Invention
In order to realize the digital control setting of the gain of the radiation detection signal, the invention provides a digital control gain amplification front end which is composed of an analog switch, a resistor network and an FPGA (field programmable gate array), in order to reduce noise interference, an amplification circuit adopts a reverse negative feedback mode, a feedback loop for controlling the amplification gain is composed of the analog switch, a resistor and a capacitor, the analog switch is controlled through an output port of the FPGA, different resistors and capacitors are switched, the amplification front ends with different gains are realized, and the use requirements of various occasions are met.
In order to achieve the purpose, the invention adopts the following technical scheme:
a radiation detection signal amplification front end based on numerical control gain mainly comprises a primary operational amplifier, a secondary operational amplifier, an analog switch, a resistor and capacitor network and an FPGA.
(1) The radiation detection signal firstly enters a reverse negative feedback amplifying circuit formed by a primary operational amplifier to realize primary amplification of the radiation detection signal, a low injection charge analog switch, a high-precision and low-temperature ticket resistor and a capacitor form a primary amplification gain gear, and the primary amplification gain is set to be higher for suppressing the noise of the circuit.
(2) The first-stage amplification output signal enters a reverse negative feedback amplification circuit consisting of a second-stage operational amplifier, a second-stage amplification gain gear consists of an analog switch, a resistor and a capacitor, the circuit structure is the same as that of the first stage, and after the radiation detection signal is reversely amplified for the first stage and the second stage, the second-stage amplification circuit outputs a signal in the same direction as the radiation detection signal, so that the subsequent analog-digital conversion circuit can conveniently acquire the signal.
(3) The output port of the FPGA is connected with the analog switch control ends of the first-stage amplifying circuit and the second-stage amplifying circuit, the switching combination of the analog switches is realized through an FPGA program, and the control and the setting of a plurality of gains can be realized.
Drawings
FIG. 1-schematic block diagram of radiation detection signal amplification front end based on digital control gain
FIG. 2 is a diagram of the actual test result of the radiation detection signal amplification front end based on the numerical control gain created by the present invention
Detailed Description
The invention will be described in further detail with reference to specific embodiments.
The invention mainly designs a radiation detection signal amplification front end based on numerical control gain by using an operational amplifier, an analog switch, a resistor and a capacitor, realizes large-range dynamic setting of the radiation detection signal gain, and solves the problems of fixed gain and limited application of a radiation detection signal amplification circuit.
A radiation detection signal amplification front-end functional block diagram based on numerical control gain is shown in figure 1 and comprises a primary operational amplifier, a multi-path analog switch, a resistor, a capacitor and an FPGA, wherein the primary operational amplifier, the multi-path analog switch, the resistor, the capacitor and the FPGA are sequentially connected. The first-stage amplifying circuit and the second-stage amplifying circuit are provided with analog switches, resistors and capacitors, and each channel of each analog switch controls different gains, namely each channel corresponds to one resistor and one capacitor, so that a gain setting state is formed. Compared with the common amplification front end, the amplifier has more analog switches, resistors and capacitors. The final gain is determined by the gain of the first-stage amplifying circuit and the gain of the second-stage amplifying circuit, the number combination of the paths controlled by the analog switch of the first-stage amplifying circuit is the number of the gains which can be set by the first-stage amplifying circuit, and similarly, the second-stage amplifying circuit is the same as the first-stage amplifying circuit. If only one path is switched on for calculation in the first stage and the second stage each time, the gain of the front end of the radiation detection signal amplification based on the numerical control gain is equal to the product of the number of the settable gains of the first stage amplification and the number of the settable gains of the second stage amplification circuit.
The primary amplification circuit and the secondary amplification circuit of the radiation detection signal amplification front end based on the numerical control gain are respectively a numerical control gain amplification front end consisting of 4 analog switches, 4 high-precision low-temperature drift resistors and 4 capacitors. And the FPGA is used for controlling the on-off of each channel of the analog switch, so that the dynamic setting of the gain is realized. If only the single channel of the first-stage amplification circuit and the single channel of the second-stage amplification circuit are switched on each time, 4 kinds of gain setting can be respectively realized by the first-stage amplification circuit and the second-stage amplification circuit; thus, the available digitally controlled gain amplification front end can set the number of gains to 16. Fig. 2 shows typical digital control gains of a radiation detection signal amplification front end based on digital control gains, where the digital control gains are 2 times, 4 times, 8 times, and 16 times, respectively.
A radiation detection signal amplification front end based on numerical control gain adopts an analog switch, a high-precision low-temperature drift resistor and a capacitor combination mode to realize dynamic setting of gain, and has the advantages of low noise, large dynamic range and the like.
The above embodiments of the present invention are only examples for illustrating the present invention, and are not intended to limit the present invention. Variations and modifications in other variations will occur to those skilled in the art upon reading the foregoing description. Not all embodiments are exhaustive. All obvious changes and modifications which are within the technical scope of the invention are covered by the invention.
Claims (2)
1. A radiation detection signal amplification front end based on numerical control gain comprises a first-stage amplification circuit, a second-stage amplification circuit, a gain control circuit consisting of an analog switch and a resistor capacitor, wherein the first-stage amplification circuit and the second-stage amplification circuit are sequentially connected with each other.
2. The digitally controlled gain-based radiation detection signal amplification front end of claim 1, wherein: the digital control gain is composed of an analog switch, a resistor and a capacitor, one end of each channel of the analog switch is connected with one end of the resistor and one end of the capacitor with different resistance values, the other end of the analog switch is connected with the other wiring terminal of the resistor and the other wiring terminal of the capacitor, and the control end of the analog switch is connected with programmable devices such as an FPGA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822113978.5U CN211405981U (en) | 2018-12-17 | 2018-12-17 | Radiation detection signal amplification front end based on numerical control gain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822113978.5U CN211405981U (en) | 2018-12-17 | 2018-12-17 | Radiation detection signal amplification front end based on numerical control gain |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211405981U true CN211405981U (en) | 2020-09-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201822113978.5U Expired - Fee Related CN211405981U (en) | 2018-12-17 | 2018-12-17 | Radiation detection signal amplification front end based on numerical control gain |
Country Status (1)
| Country | Link |
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| CN (1) | CN211405981U (en) |
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2018
- 2018-12-17 CN CN201822113978.5U patent/CN211405981U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200901 Termination date: 20201217 |
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| CF01 | Termination of patent right due to non-payment of annual fee |