CN203632629U - Intermediate-frequency filter circuit having frequency adaptivity - Google Patents
Intermediate-frequency filter circuit having frequency adaptivity Download PDFInfo
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- CN203632629U CN203632629U CN201320863170.3U CN201320863170U CN203632629U CN 203632629 U CN203632629 U CN 203632629U CN 201320863170 U CN201320863170 U CN 201320863170U CN 203632629 U CN203632629 U CN 203632629U
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- 238000001514 detection method Methods 0.000 claims abstract description 23
- 238000001914 filtration Methods 0.000 claims description 10
- 238000004891 communication Methods 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 241000282693 Cercopithecidae Species 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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Abstract
The utility model provides an intermediate-frequency filter circuit having frequency adaptivity. The circuit comprises a frequency detection module, a control module, multiple paths of switches and a filter array. The frequency detection module performs frequency detection on an intermediate-frequency input signal, and an output end of the frequency detection module is connected with the control module; the control module provides control signals for the multiple paths of the switches according to frequency detection results output by the detection module; and the multiple paths of the switches are controlled by the signals output by the control module and switch signal paths of the filter array. By utilizing the frequency detection module, the frequency of the received intermediate-frequency is detected and determined; and, by utilizing the control module, the filter paths are automatically switched. On the basis that the communication stability and anti-interference ability are not sacrificed, the adaptability and compatibility of a receiver is guaranteed to the maximum extent.
Description
Technical field
The utility model relates to electronic technology field, particularly relates to wireless receiving circuit receive frequency in communication system with adaptivity.
Background technology
Receiving circuit is the critical component in communication system, along with fast development and the modulation system complexity of the communication technology are various, present frequency spectrum resource is more and more in short supply, spectral interference is also more and more serious, this linearity to receiving circuit, antijamming capability, adaptability, the performance index such as receiving sensitivity propose higher requirement.
Common receiver, by the radiofrequency signal receiving, by down-conversion, is transformed into intermediate frequency, and at intermediate frequency place, filter is set to fixing centre frequency and fixing reception bandwidth, to receive the signal of expectation and to remove and disturb.And in actual applications, the product of receiver communication may be manufactured by different manufacturers, due to objective factors such as manufacturing process, be difficult to guarantee the consistency of these product work frequencies, the radiofrequency signal offset frequency phenomenon that receiver receives is unavoidable.Realize with all products and communicating, must guarantee that the reception bandwidth of receiving circuit is enough wide, but receive the wide monkey chatter equivalent risk that can increase again of bandwidth, cause the unsteadiness of communication.The frequency adaptability that how to improve receiver becomes a difficult problem urgently to be resolved hurrily.
The utility model has designed a kind of intermediate frequency filtering circuit with frequency self-adaption, and circuit can pass through detection and the judgement of frequency to received signal, the filter circuit of automatic switchover different center frequency.Compared to the above-mentioned mode that receives bandwidth and improve receiver frequency adaptability by broadening, the design of this utility model can not sacrificed on the basis of communication stability and antijamming capability, farthest guarantee the compatibility of receiver, also reduced Related product manufacturer's cost simultaneously.
Utility model content
The purpose of this utility model is to provide a kind of intermediate frequency filtering circuit with frequency self-adaption.Proportion detection module, detects and judgement receiving intermediate frequency signal frequency; Adopt control module, filter path is automatically switched, assurance receiver adapts to the communication object from compatible different frequency deviations better.
The purpose of this utility model is to provide a kind of intermediate frequency filtering circuit with frequency self-adaption, and this circuit comprises: frequency detection module, control module, variable connector, filter array.Wherein frequency detection module, carries out frequency detecting to intermediate frequency input signal, output access control module; Control module, according to the frequency detecting result of frequency detection module output, provides control signal to variable connector; Variable connector, the signal controlling of the controlled module output of on off state, the signal path of switching filter array.
Above-mentioned filter array is made up of the filter of more than 2 or 2 different center frequency.Above-mentioned variable connector is 2, is placed in respectively filter array input and output side, and the way of switch is identical with the number of filter of filter array.
The beneficial effects of the utility model are, by detection and the judgement of frequency to received signal, the filtering path of automatic switchover different center frequency.Not sacrificing on the basis of communication stability and antijamming capability, farthest guarantee the compatibility of receiver, also reduce Related product manufacturer's cost simultaneously.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, below the accompanying drawing of required use during embodiment is described is briefly described.
Fig. 1 is the intermediate frequency filtering schematic block circuit diagram with frequency self-adaption of the utility model embodiment.101 is frequency detection module, and 102 is control module, and 103 and 104 is variable connector, and 105 is filter array.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.
As shown in Figure 1, be the concrete scheme of the intermediate frequency filtering circuit with frequency self-adaption of the utility model embodiment.
Described intermediate frequency filtering circuit is by frequency detection module (101), control module (102), and variable connector 1 (103) and 2 (104), filter array (105) forms.
Frequency detection module (101) output access control module (102), the output control pin of control module (102) is that two variable connectors (103) (104) provide control signal.The input termination intermediate frequency input signal of switch 1 (103), the output termination intermediate frequency output signal of switch 2 (104).Control module (102) is made up of programming device (as MCU, FPGA) or other logical circuits.Filter array (105) is made up of the filter of 2 or 2 above different center frequency.
Radiofrequency signal enters receiver, form intermediate-freuqncy signal through down-conversion, when intermediate-freuqncy signal enters circuit, part signal enters frequency detection module (101), frequency detection module (101), by intermediate-freuqncy signal is processed and calculated, is obtained the actual frequency characteristic of intermediate-freuqncy signal.The frequency information of this intermediate-freuqncy signal is passed to control module (102) by frequency detection module (101), and control module (102) judges that this frequency drops in the bandwidth of which intermediate-frequency filter.
In the time that control module (102) judges that this frequency drops in the bandwidth range of filter array (105) median filter 1, by I/O mouth or other control modes, control information is provided to variable connector 1 (103) and 2 (104), controlling the break-make of variable connector 1 (103) and 2 (104) selects, thereby acceptance filter 1, intermediate-freuqncy signal flows into filter 1 through variable connector 1 (103), then passes through variable connector 2 (104) outputs.Realize the receiving mode of the 1st filter circuit of receiver.
In the time that control module (102) judges that this frequency drops in the bandwidth range of filter array (105) median filter 2, by I/O mouth or other control modes, control information is provided to variable connector 1 (103) and 2 (104), controlling the break-make of variable connector 1 (103) and 2 (104) selects, thereby acceptance filter 2, intermediate-freuqncy signal flows into filter 2 through variable connector 1 (103), then passes through variable connector 2 (104) outputs.Realize the receiving mode of the 2nd filter circuit of receiver.
By that analogy, the obtaining intermediate frequency signal frequency information by frequency detection module, the judgement of control module to frequency information, determination frequency falls in the bandwidth of which intermediate-frequency filter, thereby the switching of controlling variable connector 1 (103) and 2 (104) is selected, receiver is received in the intermediate frequency filtering circuit of different center frequency and freely switches, realize a tractor serves several purposes, improved compatibility and the frequency adaptability of receiver.
Above-described specific embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiment of the utility model; and be not used in limit protection range of the present utility model; all within spirit of the present utility model and principle, any modification of making, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (3)
1. an intermediate frequency filtering circuit with frequency self-adaption, is characterized in that, this circuit comprises: frequency detection module, control module, variable connector, filter array;
Described frequency detection module, carries out frequency detecting to intermediate frequency input signal, output access control module;
Described control module, according to the frequency detecting result of frequency detection module output, provides control signal to variable connector;
Described variable connector, the signal controlling of the controlled module output of on off state, the signal path of switching filter array.
2. circuit according to claim 1, is characterized in that, described filter array is made up of the filter of more than 2 or 2 different center frequency.
3. circuit according to claim 1, is characterized in that, described variable connector is 2, is placed in respectively filter array input and output side, and the way of switch is identical with the number of filter of filter array.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320863170.3U CN203632629U (en) | 2013-12-25 | 2013-12-25 | Intermediate-frequency filter circuit having frequency adaptivity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320863170.3U CN203632629U (en) | 2013-12-25 | 2013-12-25 | Intermediate-frequency filter circuit having frequency adaptivity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203632629U true CN203632629U (en) | 2014-06-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320863170.3U Expired - Lifetime CN203632629U (en) | 2013-12-25 | 2013-12-25 | Intermediate-frequency filter circuit having frequency adaptivity |
Country Status (1)
| Country | Link |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111407229A (en) * | 2019-01-07 | 2020-07-14 | 四川锦江电子科技有限公司 | Novel electrophysiological filter circuit implementation method |
| US10797414B2 (en) | 2016-07-08 | 2020-10-06 | Hirschmann Car Communication Gmbh | Cable connector for coaxial cable on thick printed-circuit board |
| CN112073031A (en) * | 2020-09-07 | 2020-12-11 | 青岛鼎信通讯股份有限公司 | Parameter-configurable active filter circuit |
| US11881885B2 (en) | 2019-04-15 | 2024-01-23 | Audi Ag | Antenna device for transmitting high-frequency signals from or to a motor vehicle, and motor vehicle comprising an antenna device |
-
2013
- 2013-12-25 CN CN201320863170.3U patent/CN203632629U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10797414B2 (en) | 2016-07-08 | 2020-10-06 | Hirschmann Car Communication Gmbh | Cable connector for coaxial cable on thick printed-circuit board |
| CN111407229A (en) * | 2019-01-07 | 2020-07-14 | 四川锦江电子科技有限公司 | Novel electrophysiological filter circuit implementation method |
| US11881885B2 (en) | 2019-04-15 | 2024-01-23 | Audi Ag | Antenna device for transmitting high-frequency signals from or to a motor vehicle, and motor vehicle comprising an antenna device |
| CN112073031A (en) * | 2020-09-07 | 2020-12-11 | 青岛鼎信通讯股份有限公司 | Parameter-configurable active filter circuit |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140604 |