CN115567070A - Front end assembly capable of self-adapting to instantaneous dynamic expansion - Google Patents
Front end assembly capable of self-adapting to instantaneous dynamic expansion Download PDFInfo
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- CN115567070A CN115567070A CN202211472475.1A CN202211472475A CN115567070A CN 115567070 A CN115567070 A CN 115567070A CN 202211472475 A CN202211472475 A CN 202211472475A CN 115567070 A CN115567070 A CN 115567070A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
Abstract
The invention provides a self-adaptive instantaneous dynamic expansion front-end component, which comprises an amplitude limiter, a microwave filter and a microwave amplifier, and further comprises a coupler, a power divider, a detector, a comparator and a switch 1 in 2-out-of-one; the coupler is arranged between the microwave filter and the microwave amplifier, and is used for coupling and shunting the signal filtered by the microwave filter and respectively sending the signal to the microwave amplifier and the power divider; the power divider respectively outputs the power divider to a first input end of the comparator and a first input end of the 1-out-of-2 switch; the microwave amplifier amplifies the main circuit signal and inputs the amplified main circuit signal to a second input end of the 1-from-2 switch; the second input end of the comparator inputs threshold voltage provided by the outside, outputs TTL control signals to the control end of the 2-to-1 switch, and controls the 2-to-1 switch to select main circuit signals or coupling branch circuit signals to output. The invention has the capacity of expanding the instantaneous dynamic range of more than 25dB under the condition of lower noise coefficient and has the function of configuring the dynamic threshold.
Description
Technical Field
The invention relates to the technical field of microwaves, in particular to a front-end component capable of self-adapting instantaneous dynamic expansion.
Background
The front end component is an important component of radar and electronic warfare, is close to the antenna and is the foremost end of the whole receiver, and mainly achieves the functions of amplitude limiting, low-noise amplification, preselection filtering, numerical control attenuation and the like on signals received by the antenna. The quality of the noise coefficient and dynamic range index of the front-end component often directly affects the corresponding index of the whole system, and the large dynamic range of the system is ensured under the condition of ensuring the lowest noise coefficient when the front-end component is designed. The usual design is one with the lowest noise figure in the front-end components, and the dynamic expansion is achieved by configuring numerically controlled attenuation and using digital signals to control the different attenuations.
As can be seen from fig. 1, this type of front-end component has the capability of gain adjustment to expand the dynamic range of the system, but the speed of expanding the digital controlled attenuation depends on the back-end digital processing speed and the transmission speed of the control bus, which is often in the us level and cannot meet the fast attenuation control capability of the system, and the digital controlled attenuation after the amplifier has a large signal entering the nonlinear active amplifier results in limited capability of expanding the dynamic range and cannot meet the application requirements of some systems.
As can be seen from the topological block diagram of another front-end component design in fig. 2, this type of front-end component is designed in a manner that is optimal for dynamic range expansion, and although the expansion capability is strong, it must place a digitally controlled attenuator in front of the amplifier, which inevitably results in the deterioration of the noise figure of the whole front-end component, and thus the sensitivity of the system is lost, and certain requirements of the system application for high sensitivity and large dynamic range expansion cannot be met.
Disclosure of Invention
Aiming at the problems in the prior art, the front-end component for adaptive instantaneous dynamic expansion is provided, can realize rapid gain adjustment, has configurable threshold, and has the capability of rapidly expanding the dynamic range of a system below 100ns under the condition of basically not influencing the sensitivity of the system.
The technical scheme adopted by the invention is as follows: a self-adaptive instantaneous dynamic expansion front-end component comprises an amplitude limiter, a microwave filter and a first microwave amplifier which are sequentially connected, and further comprises a coupler, a power divider, a detector, a comparator and a switch 1 from 2; the coupler is arranged between the microwave filter and the first microwave amplifier, and is used for coupling and shunting the signals filtered by the microwave filter, main path signals are sent to the first microwave amplifier, and coupling branch path signals are sent to the power divider; the power divider divides the coupling branch into two paths, one path is input into a first input end of the comparator, and the other path is input into a first input end of the 1-from-2 switch; the first microwave amplifier amplifies the main circuit signal and inputs the amplified main circuit signal to a second input end of the 2-to-1 switch; the second input end of the comparator inputs a threshold voltage provided by the outside, outputs a TTL control signal to the control end of the 2-to-1 switch, and controls the 2-to-1 switch to select a main circuit signal or a coupling branch signal for output.
Furthermore, a detector is arranged between the output end of the power divider and the first input end of the comparator, and is used for converting the power of the coupled branch signal shunted by the power divider into an analog voltage, and then inputting the analog voltage to the first input end of the comparator.
Furthermore, the device also comprises a CAN circuit and a digital-to-analog conversion module which are connected in sequence, wherein the output end of the digital-to-analog conversion module is connected to the second input end of the comparator; the CAN circuit receives a detection threshold configured outside, outputs the detection threshold to the digital-to-analog conversion module to be converted into a threshold voltage, and then inputs the analog threshold voltage to a second input end of the comparator.
Further, the comparator compares the analog voltage output by the detector with a threshold voltage, and when the detection voltage is greater than the threshold value, the comparator issues a TTL control signal to switch the 2-to-1 switch to gate the coupling branch as a receiving channel, otherwise, the comparator gates the main path as the receiving channel.
Further, the output end of the 1-out-of-2 switch is connected to a second microwave amplifier, and the output end of the second microwave amplifier is amplified and then output.
Further, the CAN circuit specifically includes a CAN transceiver chip and a single chip, and transmits and receives CAN signals through the CAN transceiver chip, receives an externally configured detection threshold, and the single chip is configured to analyze the externally configured detection threshold and send the analyzed detection threshold to the digital-to-analog conversion module.
Further, the CAN transceiver chip is implemented by TJA 1040T.
Further, the single chip microcomputer is realized by adopting MC9S12DJ256 MFU.
Further, the digital-to-analog conversion module is implemented by an AD8522AR, and is configured to complete digital-to-analog conversion of the threshold and output the threshold voltage to the comparator.
Further, the 1-out-of-2 switch is WKD a000250 and is used for selecting the amplifying branch and the coupling branch.
Compared with the prior art, the beneficial effects of adopting the technical scheme are as follows: the front-end component provided by the invention has the capability of expanding the instantaneous dynamic range of more than 25dB with the response speed of 100ns under the condition of lower noise coefficient, and has the function of configuring the dynamic threshold.
Drawings
Fig. 1 is a block diagram of a front-end component topology in the prior art.
Fig. 2 is a block diagram of another prior art front-end component topology.
Fig. 3 is a block diagram of a topology of a front-end component according to the present invention.
FIG. 4 is a simulation model of an embodiment of a front-end component in accordance with the present invention;
FIG. 5 shows simulation results of noise figure at the front-end module according to an embodiment of the present invention;
FIG. 6 illustrates the simulation result of the front-end component inputting P-1 according to an embodiment of the present invention;
FIG. 7 shows the simulation result of the front-end component gain according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar modules or modules having the same or similar functionality throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application. On the contrary, the embodiments of the application include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
As shown in fig. 3, the present embodiment provides a front-end component with adaptive transient dynamic expansion, which includes a limiter, a microwave filter, and a first microwave amplifier, which are connected in sequence, and completes the functions of limiting, amplifying, and filtering required by the conventional front-end component; on the basis, the front-end component further comprises a coupler, a power divider, a detector, a comparator and a 1-out-of-2 switch; the coupler is arranged between the microwave filter and the first microwave amplifier, and is used for coupling and shunting signals filtered by the microwave filter, main path signals are sent to the first microwave amplifier, and coupling branch signals are sent to the power divider, wherein the main path signals are used for normal receiving function, and the coupling channel is used for signal coupling out and used for detection and dynamic expansion.
The power divider divides the coupling branch into two paths, one path is input into a first input end of the comparator, and the other path is input into a first input end of the 1-out-of-2 switch; one input to the comparator is mainly used as a detection signal, and the other input is used as an antenna signal in the case of a large signal.
In this embodiment, a detector is disposed between the output end of the power divider and the first input end of the comparator, and is configured to convert the power of the coupling branch signal shunted by the power divider into an analog voltage, and input the analog voltage to the first input end of the comparator.
The first microwave amplifier amplifies the main circuit signal and inputs the main circuit signal to a second input end of the 2-to-1 switch; the second input end of the comparator inputs threshold voltage provided by the outside, outputs TTL control signals to the control end of the 2-to-1 switch, and controls the 2-to-1 switch to select main circuit signals or coupling branch circuit signals to output.
In this embodiment, the comparator compares the analog voltage output by the detector with a threshold voltage, and when the detection voltage is greater than the threshold value, the comparator issues a TTL control signal to switch the 2-to-1 switch to gate the coupling branch as a receiving channel, otherwise, the comparator gates the main path as the receiving channel, so as to realize fast switching of the channels.
In a preferred embodiment, in order to realize that the front-end component CAN adjust the dynamic extension range at any time, the front-end component further comprises a CAN circuit and a digital-to-analog conversion module which are connected in sequence, wherein an output end of the digital-to-analog conversion module is connected to a second input end of the comparator; the CAN circuit receives a detection threshold configured outside, outputs the detection threshold to the digital-to-analog conversion module to be converted into a threshold voltage, and then inputs the analog threshold voltage to a second input end of the comparator.
Specifically, in this embodiment, the CAN circuit mainly includes a CAN transceiver chip and a single chip, where the CAN transceiver chip (in this embodiment, TJA 1040T) transmits and receives a CAN signal, the single chip (in this embodiment, MC9S12DJ256 MFU) is used for threshold analysis and issuing to the digital-to-analog conversion module, and the CAN circuit further includes corresponding peripheral resistors and capacitors for basic current configuration.
The digital-to-analog conversion module is realized by adopting an AD8522AR, is used for completing digital-to-analog conversion of the threshold, and outputs the digital-to-analog conversion to the comparator as threshold voltage.
Further, the output end of the 1-out-of-2 switch is connected to a second microwave amplifier, and the output end of the second microwave amplifier is amplified and then output.
In a preferred embodiment, the 1-out-of-2 switch is WKD102a000250, and is used for amplification branch selection and coupling branch selection.
Further, in order to test the capability of the front-end component, a simulation model as shown in fig. 4 is established, wherein the gain of the selected amplifier is 10dB, the insertion loss of the coupler is less than 0.5dB, the coupling degree of the coupler is 15dB ± 0.5dB, the insertion loss of the power divider is less than 4dB, the insertion loss of the 1-out-of-2 switch is less than 2dB, and the switching time of the 1-out-of-2 switch is less than 20ns.
It can be seen that the front-end component link shown in fig. 3 is used for integration, and the noise coefficient of the front-end component example is less than 4.2dB, the front-end gain of dynamic expansion is 15.5dB ± 1dB, and the front-end component link has 29dB dynamic range expansion capability less than 50 ns.
FIG. 5 shows the simulation results of the noise figure of the front-end module, which is very low, less than 4.2dB; FIG. 6 shows the P-1 simulation result of the input of the front-end module in the present embodiment, compared with the P-1 simulation result of the input of the front-end module without expansion, the P-1 simulation result is improved by 29dB after expansion, which can bring about the 29dB dynamic range improvement of the system; the gain simulation results of the front-end module of fig. 7 and the front-end module of this embodiment have a gain difference of 29dB before and after dynamic expansion, which is consistent with the design. The simulation results show that the performance of the front-end component of the invention is superior to that of the traditional front-end component in all aspects.
It should be noted that, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases by those skilled in the art; the drawings in the embodiments are used for clearly and completely describing the technical scheme in the embodiments of the invention, and obviously, the described embodiments are a part of the embodiments of the invention, but not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. A front-end component with self-adaptive instantaneous dynamic expansion comprises an amplitude limiter, a microwave filter and a first microwave amplifier which are sequentially connected, and is characterized by further comprising a coupler, a power divider, a detector, a comparator and a switch for selecting 1 from 2; the coupler is arranged between the microwave filter and the first microwave amplifier, and is used for coupling and shunting the signals filtered by the microwave filter, the main path signal is sent to the first microwave amplifier, and the coupling branch signal is sent to the power divider; the power divider divides the coupling branch into two paths, one path is input into a first input end of the comparator, and the other path is input into a first input end of the 1-out-of-2 switch; the first microwave amplifier amplifies the main circuit signal and inputs the amplified main circuit signal to a second input end of the 2-to-1 switch; the second input end of the comparator inputs a threshold voltage provided by the outside, outputs a TTL control signal to the control end of the 2-to-1 switch, and controls the 2-to-1 switch to select a main circuit signal or a coupling branch signal for output.
2. The front-end module according to claim 1, wherein a detector is disposed between the output terminal of the power divider and the first input terminal of the comparator, and is configured to convert the power of the coupled branch signal split by the power divider into an analog voltage, and input the analog voltage to the first input terminal of the comparator.
3. The front-end component of adaptive transient dynamic expansion according to claim 1 or 2, further comprising a CAN circuit and a digital-to-analog conversion module connected in sequence, wherein an output end of the digital-to-analog conversion module is connected to a second input end of the comparator; the CAN circuit receives a detection threshold configured outside, outputs the detection threshold to the digital-to-analog conversion module to be converted into a threshold voltage, and then inputs the analog threshold voltage to a second input end of the comparator.
4. The adaptive transient dynamic extension front-end module as claimed in claim 2, wherein said comparator compares the analog voltage outputted from the detector with a threshold voltage, and when the detected voltage is greater than the threshold value, the TTL control signal is issued to switch the 2-to-1 switch gating coupling branch as the receiving channel, otherwise, the main branch is gated as the receiving channel.
5. The front-end module according to claim 1, wherein the output terminal of the 1-out-of-2 switch is connected to a second microwave amplifier, and the output terminal of the second microwave amplifier is amplified and then output.
6. The front-end component according to claim 3, wherein the CAN circuit specifically includes a CAN transceiver chip and a single chip, the CAN transceiver chip transmits and receives CAN signals and receives an externally configured detection threshold, and the single chip is configured to analyze the externally configured detection threshold and send the analyzed detection threshold to the digital-to-analog conversion module.
7. The adaptive transient dynamic extension front-end component of claim 6, wherein the CAN transceiver chip is implemented using TJA 1040T.
8. The front-end component for adaptive transient dynamic expansion of claim 6, wherein the single-chip microcomputer is implemented using MC9S12DJ256 MFU.
9. The front-end component of adaptive transient dynamic expansion of claim 3, wherein the digital-to-analog conversion module is implemented by using AD8522AR for performing digital-to-analog conversion of the threshold and outputting the threshold voltage to the comparator.
10. The adaptive transient dynamic expansion front-end component of claim 1, wherein the 1-out-of-2 switch is WKD a000250 for amplification branch and coupling branch selection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211472475.1A CN115567070B (en) | 2022-11-23 | 2022-11-23 | Front end assembly capable of self-adapting to instantaneous dynamic expansion |
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| CN202211472475.1A CN115567070B (en) | 2022-11-23 | 2022-11-23 | Front end assembly capable of self-adapting to instantaneous dynamic expansion |
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| CN115567070B CN115567070B (en) | 2023-03-14 |
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Cited By (1)
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| CN117411485A (en) * | 2023-12-15 | 2024-01-16 | 成都威频通讯技术有限公司 | ADC sampling protection circuit and sampling system |
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