CN108134591A - A kind of reconfigurable filter - Google Patents
A kind of reconfigurable filter Download PDFInfo
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- CN108134591A CN108134591A CN201810201132.9A CN201810201132A CN108134591A CN 108134591 A CN108134591 A CN 108134591A CN 201810201132 A CN201810201132 A CN 201810201132A CN 108134591 A CN108134591 A CN 108134591A
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/04—Frequency selective two-port networks
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Abstract
The invention discloses a kind of reconfigurable filter, comprising：At least one switch module, at least two mutual cascade resonance circuits, each switch module are connected at least one resonance circuit, and switch module participates in the number of the resonance circuit of resonance for control.The present invention has in the case where meeting state's network mark standard, and transmitter and receiver are in switch operating frequency range without needing to change hardware device so that the advantages of reducing cost, accelerate frequency range processing speed.
Description
Technical field
The present invention relates to field of communication technology, more particularly to a kind of reconfigurable filter.
Background technology
More and more extensive with the application of power-line carrier communication, people by power line medium into row information to being passed
Defeated requirement is also increasingly stringenter.IEEE1901, ITU-T based on OFDM technology G.9960 with national grid power line transmission
Standard (hereinafter referred to as state's network mark is accurate) is also just come into being.State's network mark standard has been done corresponding based on the technology of IEEE1901
Enhancing.State's network mark standard employs the different several frequency ranges of bandwidth for different application scenarios and carries out data transmission.For example, state
The subcarrier serial number 80-490 of net standard bands 0, the subcarrier serial number 100-230 of state's net standard bands 1.If coding staff
Formula is identical with modulation system, and in general, power line carrier communication uses the relatively narrow frequency range close to low frequency that can improve communication
Transmission range；It is transmitted using wider frequency section（Especially with high frequency subcarriers）Data throughout can be improved but communication can be reduced and passed
Defeated distance.In current state's network mark standard, operation of receiver can not receive the data of frequency range 1 that transmitter is sent in frequency range 0
Packet, vice versa.
Since the wave filter in hardware device of the prior art only supports a band（Frequency range）Filtering, each hardware dress
For the wave filter put as shown in Fig. 1 a ~ Fig. 2 b, Fig. 1 a are the circuit structure signal of difference filter in Band2 high-pass filters
Figure；Fig. 1 b are the electrical block diagram of single-ended filter in Band2 high-pass filters；Fig. 2 a are in Band1 high-pass filters
The electrical block diagram of difference filter；Fig. 2 b are the electrical block diagram of the single-ended filter of Band1 high-pass filters；
Therefore when transmitter and receiver needs are switched to another frequency range from a frequency range, communicating pair is needed to re-replace not
Same hardware device, so as to fulfill the switching of wave filter.In the communication system for meeting IEEE1901 and ITU-T G.9960 agreement
In also have similar problems.
Invention content
The object of the present invention is to provide a kind of reconfigurable filters, realize that solution is above-mentioned in the situation for meeting state's network mark standard
Under, the problem of transmitter and receiver must replace hardware device in switch operating frequency range, and reach low with hardware cost,
The purpose of the fast characteristic of processing speed.
In order to reach object above, the invention is realized by the following technical scheme.
A kind of reconfigurable filter, comprising：At least one switch module, at least two mutual cascade resonance circuits, often
A switch module is connected at least one resonance circuit, and the switch module participates in the described humorous of filtering for controlling
It shakes the number of circuit.
Preferably, the resonance circuit is LC resonance circuit.
Preferably, during the conducting of the switch module, participating in the number of the resonance circuit of filtering increases；The switch
When being not turned on of module, the number for participating in the resonance circuit of filtering are reduced.
Preferably, the switching circuit that the switch module is formed for NPN triode and PNP triode；Wherein, the PNP
Triode connects for switching, and the NPN triode is used to control the on or off state of the PNP triode；Alternatively, institute
State NPN triode for switch connect, the NPN triode is for controlling the on and off of the PNP triode.
Another technical solution of the present invention is a kind of reconfigurable filter, comprising：At least one switch module, Band1 are poor
In filter-divider or Band1 single-ended filters, the switch module and Band1 difference filters or Band1 single-ended filters
Filter capacitor C3 and filter inductance L2 series connection, it is in parallel with capacitance C1.
Preferably, when wave filter is Band1 difference filters, and the state of the switch is conducting state, the filtering
Device is the Band1 difference filters that frequency response is filtered to Band1；When the state of the switch is in off state, the filtering
Device is the Band2 difference filters that frequency response is filtered to Band2.
Preferably, when wave filter is Band1 single-ended filters, and the state of the switch is conducting state, the filtering
Device is the Band1 single-ended filters that frequency response is filtered to Band1；When the state of the switch is in off state, the filtering
Device is the Band2 single-ended filters that frequency response is filtered to Band2.
Preferably, the switching circuit that the switch is formed for NPN triode and PNP triode；Wherein, tri- poles of PNP
For pipe for switching connection, the NPN triode is used to control the on or off state of the PNP triode；It is alternatively, described
NPN triode connects for switching, and the NPN triode is used to control the on and off of the PNP triode.
Preferably, when the PNP triode is for switching connection, the collector 1 of the PNP triode and close capacitance
One end branch line conductor connection of C1；The emitter 2 of the PNP triode is connect with one end of filter capacitor C3, the filtered electrical
The other end for holding C3 is connect with filter inductance L2；The emitter 2 of the PNP triode also accesses power supply VCC by a resistance；Institute
The base stage for stating PNP triode is connected by a resistance and the collector of NPN triode；The emitter ground connection of the NPN triode,
The base stage incoming control signal of the NPN triode.
Preferably, when it is low level to control signal, the PNP triode is not turned on forming high resistant, the NPN triode
The filter inductance L2 to connect with the NPN triode and filter capacitor C3 impedances are high resistant；The control signal is high level
When, the PNP triode is connected to form low-resistance, L2, C3 impedance that the NPN triode is connected with NPN triode be rendered as L2,
The impedance of C3.
Compared with the prior art, the present invention has the following advantages.
The present invention is by using the switching by controlling switch on the basis of the component values for not changing low-pass filter
Realize that the number for changing LC resonance circuit so as to fulfill the reconstruct to low-pass filter, changes the frequency response of low-pass filter.This hair
It is bright low with hardware cost, the fast advantage of conversion speed.
Using Signal-controlled switch is controlled to switch over, when switching, imports different resonance circuits, so as to complete to filter
The reconstruct of wave device, using one or N number of switch realizes the reconstruct of two or more wave filters（It is not limited to N+1 kinds）, the application fits
For single-ended or difference filter；High pass, low pass, band logical, bandstop filter；Butterworth, Chebyshev's I type II types are oval
The different types such as function, Bayside.
The present invention switching circuit can be used BJT or field-effect tube etc. available for switching circuit device can be applied to it is identical
The sef-adapting filter of rank or not same order, and do not limit to the number of switching circuit, i.e., sef-adapting filter can realize multiple band
It is adaptive.
Description of the drawings
Electrical block diagrams of Fig. 1 a for difference filter in Band2 high-pass filters in the prior art；
Electrical block diagrams of Fig. 1 b for single-ended filter in Band2 high-pass filters in the prior art；
Electrical block diagrams of Fig. 2 a for difference filter in Band1 high-pass filters in the prior art；
Fig. 2 b are the electrical block diagram of the single-ended filter of Band1 high-pass filters in the prior art；
Fig. 3 is the electrical block diagram of the difference sef-adapting filter of one embodiment high-pass filter in the present invention；
Fig. 4 is the electrical block diagram of the single-ended sef-adapting filter of one embodiment high-pass filter in the present invention；
Fig. 5 is that the impact of performance schematic diagram that Band2 and Band1 adaptively switch is realized by the way of in Fig. 3 or Fig. 4；
Fig. 6 is the schematic diagram of the component values of low-pass filter；
Fig. 7 is the schematic diagram of the component values of the low-pass filter after reconstruct；
Fig. 8 is the schematic diagram of the component values of the low-pass filter after the increase of one embodiment of the present of invention switchs；
Fig. 9 is the frequency response impact of performance signal for two kinds of different wave filters that different wave filter reconstruct are realized by the way of in Fig. 8
Figure；
Figure 10 is the electrical block diagram of the switch in a kind of restructural wave filter of the present invention.
Specific embodiment
Below in conjunction with attached drawing, by the way that a preferable specific embodiment is described in detail, the present invention is further elaborated.
According to wave filter design theory, high-pass filter, bandpass filter, bandstop filter prototype be all low-pass filtering
Device, thus with low-pass filter come illustrate the present invention can realize wave filter reconstruct principle.
With reference to shown in Fig. 6 ~ Fig. 8, Fig. 6 is the component values of low-pass filter, can be applied to Butterworth or Qie Bixue
The wave filter of husband's type.
Another wave filter is reconstructed on the basis of not changing current component values and obtaining, new resonance electricity can be added in
Road increases new zero, so as to change the frequency response curve of wave filter, for example, as shown in fig. 7, low-pass filter prototype
On the basis of increase a resonance circuit, i.e., connect a filter inductance gn+1 between resistance gn+3 and filter capacitor gn, and
Join a filter capacitor gn+2, so as to change the frequency response of low-pass filter as shown in figure 9, when frequency is in more than 15MHz's
Signal can be filtered, and the frequency signal of 15MMHz can be very good to pass through.Therefore, when increase wave filter resonance circuit,
The frequency response of wave filter can be changed, otherwise the resonance circuit for reducing wave filter can also change its frequency response.Similarly high pass, band logical,
Wave filter with types such as resistances can also use identical method.
In order to realize above-mentioned reconstruct or the switching of two kinds of wave filters, as shown in figure 8, the present invention is by each LC
One switch module is set between resonance circuit.LC resonance is increased or decreased using the characteristic of the on and off of switch module
Circuit, to the reconstruct of wave filter, realizes different filtering effects so as to fulfill in the hardware device of same transmitter or receiver
Fruit., since the state of switch module is different, the frequency response of wave filter is different, because the referred to herein as above-mentioned wave filter that can be reconstructed also may be used
To be referred to as sef-adapting filter.
As shown in figure 8, when the switch module conducting between filter capacitor gn and filter inductance gn+1, by filtered electrical
This LC resonance circuit for feeling gn+1 and filter capacitor gn+2 compositions participates in resonance；When switch is not turned on, above-mentioned filter inductance
Gn+1 and filter capacitor gn+2 are bypassed, and are not involved in resonance, therefore switch module state is different, and the filter effect of generation is not yet
Together.
By parity of reasoning, when increasing multiple switch module in foregoing circuit, by controlling opening for above-mentioned multiple switch module
Or close, the filter effect that can be adjusted is more, therefore can generate more filtering characteristics.
Another embodiment of the present invention is restructural high-pass filter.As shown in figure 3, a kind of restructural difference of the present invention
Filter-divider, comprising：Switch, Band1 difference filters, filter capacitor C3 in above-mentioned switch and Band1 difference filters and
Filter inductance L2 connects, in parallel with capacitance C1.According to current filtering frequency range needs, by the way that signal is controlled to control above-mentioned switch
The state of on and off.When the state of above-mentioned switch is conducting state, which is Band1 difference filters, can
To be filtered frequency response to Band1.When the state of above-mentioned switch is in off state, which is Band2 difference filters,
It can be filtered frequency response to Band2.
As shown in figure 4, a kind of restructural difference filter of the present invention, comprising：Switch, Band1 single-ended filters are above-mentioned
Switch is connected with the filter capacitor C3 in Band1 single-ended filters and filter inductance L2, in parallel with capacitance C1.According to current filter
Wave frequency section needs, the state of the on and off by controlling the above-mentioned switch of signal control.When the state of above-mentioned switch is conducting
During state, which is Band1 single-ended filters, can be filtered frequency response to Band1.When the state of above-mentioned switch is
During closed state, which is Band2 single-ended filters, can be filtered frequency response to Band2.
According to one embodiment of present invention, utilization NPN as shown in Figure 10 may be used in above-mentioned switch or switch module
The switching circuit that triode and PNP triode form realizes that wherein PNP triode connects for switching, and NPN triode is used to control
The on or off state of PNP triode processed.Switch connection can also be carried out using NPN triode, NPN triode is used to control
The on and off of PNP triode.
Be PNP triode shown in Figure 10 connects for switching, NPN triode be used to control PNP triode conducting or
Switch first end 1 in the collector 1 and Fig. 3 and Fig. 4 of cut-off state, wherein PNP triode is corresponding, i.e., with close to capacitance C1
The connection of one end branch line conductor.Switch second end 2 in the emitter 2 and Fig. 3 and Fig. 4 of PNP triode is corresponding, i.e., with it is close
One end connection of filter capacitor C3, and pass through resistance access power supply VCC.The base stage of PNP triode passes through a resistance and NPN tri-
The collector connection of pole pipe.The emitter ground connection of NPN triode, the base stage incoming control signal of NPN triode.
When it is low level to control signal, PNP triode is not turned on（Cut-off state）Form high resistant, NPN triode and NPN
The filter inductance L2 of triode series connection and filter capacitor C3 impedances are high resistant.Then the wave filter in Fig. 3 and Fig. 4 is reconstructed into respectively
Band2 difference filters and Band2 single-ended filters.
When it is high level to control signal, PNP triode is connected to form low-resistance, and NPN triode is connected with NPN triode
L2, C3 impedance are rendered as the impedance of L2, C3, then the wave filter in Fig. 3 and Fig. 4 be reconstructed into respectively Band1 difference filters and
Band1 single-ended filters.
Fig. 5 shows the filtering performance to high-frequency signal of the wave filter of the reconstruct under both control signals, by scheming
The adaptive switching to Band1 and Band2 can be reached by understanding the wave filter of above-mentioned reconstruct.
According to one embodiment of present invention, the invention also discloses a kind of reconstructing method of wave filter, the reconstructing methods
It can be applied in power-line carrier communication system.
The on or off state of the switch module between N number of resonance circuit is arranged on by control, and then controls and participates in
The number of the resonance circuit of filtering, so as to meet the filtering to multiple frequency range signal.When switch module is connected, switch module resistance
Anti- to be rendered as low-resistance, switch module and device resistance connect with switch module are rendered as the device impedance of itself, participate in filtering
Wave plays the effect of filtering；If switch module is not turned on, switch module impedance is rendered as high resistant, switch module and and switching molding
The device resistance of block series connection is high resistant, is equivalent to open-circuit condition, no filter effect.And then realize the function of different filter effects,
Meet the filtering requirements of different frequency range.
It follows that if necessary to the switching of multiple frequency ranges, the shape of different switches can be utilized by increasing multiple switch
State realizes a variety of filter effects.The form of the unlimited wave filter of the present invention, can be applied to Butterworth, Chebyshev, elliptic function
Etc. a plurality of types of low passes, band logical, high pass or bandstop filter.Using for the switch can be with including but not limited to BJT or FET etc.
For the device of switching circuit.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. a kind of reconfigurable filter, which is characterized in that include：At least one switch module, at least two is mutually cascade humorous
Shake circuit, and each switch module is connected at least one resonance circuit, and the switch module participates in filter for controlling
The number of the resonance circuit of wave.
2. reconfigurable filter as described in claim 1, which is characterized in that the resonance circuit is LC resonance circuit.
3. reconfigurable filter as described in claim 1, which is characterized in that during the conducting of the switch module, participate in filtering
The resonance circuit number increase；When being not turned on of the switch module participates in the number of the resonance circuit of filtering
It reduces.
4. the reconfigurable filter as described in claim 1 or 3, which is characterized in that the switch module is
The switching circuit of NPN triode and PNP triode composition；
Wherein, the PNP triode for switch connect, the NPN triode be used for control the PNP triode conducting or
Cut-off state；Alternatively, the NPN triode connects for switching, the NPN triode is used to control the PNP triode
On and off.
5. a kind of reconfigurable filter, which is characterized in that include：At least one switch module, Band1 difference filters or
Band1 single-ended filters, the switch module and the filter capacitor C3 in Band1 difference filters or Band1 single-ended filters
It connects with filter inductance L2, it is in parallel with capacitance C1.
6. reconfigurable filter as claimed in claim 5, which is characterized in that
When wave filter is Band1 difference filters, and the state of the switch is conducting state, the wave filter is to Band1
It is filtered the Band1 difference filters of frequency response；When the state of the switch is in off state, the wave filter is to Band2
It is filtered the Band2 difference filters of frequency response.
7. reconfigurable filter as claimed in claim 5, which is characterized in that when wave filter be Band1 single-ended filters, it is described
When the state of switch is conducting state, the wave filter is the Band1 single-ended filters that frequency response is filtered to Band1；It is described
When the state of switch is in off state, the wave filter is the Band2 single-ended filters that frequency response is filtered to Band2.
8. the reconfigurable filter as described in claim 5 or 6 or 7, which is characterized in that
The switching circuit that the switch is formed for NPN triode and PNP triode；
Wherein, the PNP triode for switch connect, the NPN triode be used for control the PNP triode conducting or
Cut-off state；Alternatively, the NPN triode connects for switching, the NPN triode is used to control the PNP triode
On and off.
9. reconfigurable filter as claimed in claim 8, which is characterized in that
When the PNP triode is for switching connection, the collector 1 of the PNP triode and one end branch close to capacitance C1
Line conductor connects；The emitter 2 of the PNP triode is connect with one end of filter capacitor C3, and the filter capacitor C3's is another
End is connect with filter inductance L2；The emitter 2 of the PNP triode also accesses power supply VCC by a resistance；Tri- poles of PNP
The base stage of pipe is connected by a resistance and the collector of NPN triode；The emitter ground connection of the NPN triode, the NPN tri-
The base stage incoming control signal of pole pipe.
10. reconfigurable filter as claimed in claim 9, which is characterized in that when it is low level to control signal, the PNP
Triode is not turned on forming high resistant, the filter inductance L2 and filter capacitor that the NPN triode is connected with the NPN triode
C3 impedances are high resistant；It is described control signal be high level when, the PNP triode is connected to form low-resistance, the NPN triode with
L2, C3 impedance of NPN triode series connection are rendered as the impedance of L2, C3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810201132.9A CN108134591A (en) | 2018-03-12 | 2018-03-12 | A kind of reconfigurable filter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810201132.9A CN108134591A (en) | 2018-03-12 | 2018-03-12 | A kind of reconfigurable filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109687834A (en) * | 2019-01-25 | 2019-04-26 | 吉林大学 | A kind of impedance transformer and preparation method with Chebyshev's filtering characteristic of multistage transmission line and short-circuit line |
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| JP2005236839A (en) * | 2004-02-23 | 2005-09-02 | Matsushita Electric Ind Co Ltd | Lamination filter and high frequency switching circuit using it |
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| CN104730400A (en) * | 2015-04-10 | 2015-06-24 | 中国舰船研究设计中心 | Impedance analog device and EMI passive filter testing system |
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| US20160216202A1 (en) * | 2013-09-17 | 2016-07-28 | Commissariat à I'énergie atomique et aux énergies alternatives | Terahertz image sensor |
| US20170310319A1 (en) * | 2015-02-06 | 2017-10-26 | Murata Manufacturing Co., Ltd. | Switching circuit and high frequency module |
| CN207926547U (en) * | 2018-03-12 | 2018-09-28 | 上海物麒科技有限公司 | A kind of reconfigurable filter |
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| US3526858A (en) * | 1967-03-22 | 1970-09-01 | Siemens Ag | Band filter of the n-path type |
| US6298046B1 (en) * | 1998-08-28 | 2001-10-02 | Rc Networks | Adjustable balancing circuit for an adaptive hybrid and method of adjusting the same |
| JP2004187129A (en) * | 2002-12-05 | 2004-07-02 | Hitachi Metals Ltd | Multiband antenna switch circuit |
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| CN109687834A (en) * | 2019-01-25 | 2019-04-26 | 吉林大学 | A kind of impedance transformer and preparation method with Chebyshev's filtering characteristic of multistage transmission line and short-circuit line |
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Effective date of registration: 20190510 Address after: 215310 11th Floor, Block C, Haichuang Building, 288 Dengyun Road, Yushan Town, Kunshan City, Suzhou City, Jiangsu Province Applicant after: Kungao New Core Microelectronics (Jiangsu) Co.,Ltd. Address before: 200000 Pudong New Area, Shanghai, China (Shanghai) free trade trial area, No. 3, 1 1, Fang Chun road. Applicant before: SHANGHAI WU QI TECHNOLOGIES, Inc. |
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