CN102611469A - Phase shift filtering device - Google Patents
Phase shift filtering device Download PDFInfo
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- CN102611469A CN102611469A CN2012100395115A CN201210039511A CN102611469A CN 102611469 A CN102611469 A CN 102611469A CN 2012100395115 A CN2012100395115 A CN 2012100395115A CN 201210039511 A CN201210039511 A CN 201210039511A CN 102611469 A CN102611469 A CN 102611469A
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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
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- H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
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Abstract
The invention discloses a phase shift filtering method, which is used for solving the problem that the frequency near a communication channel interferes in the communication of the communication channel. In a signal receiving system, a phase difference of signals in two input ports in an appointed frequency band and outside the appointed frequency band is regulated by using a phase regulation module, so that the phase different in the appointed frequency band is 0 DEG, the phase difference outside the appointed frequency band is 180 DEG; or the phase difference in the appointed frequency band is 180 DEG, and the phase difference outside the appointed frequency band is 0 DEG, then frequency signals outside the appointed frequency band where the communication channel occupies are removed through filtration of a power synthesis module, thus in-band electromagnetic noise is removed through filtration, and anti-electromagnetic interference capability of an equipment receiving system is improved.
Description
Technical field
The present invention relates to the electromagnetic signal technical field of filtering, relate in particular to a kind of phase-shift filtering method.
Background technology
Current communication system only is limited to the filtering to the radio noise in the communications band passband to the filtering scope of radio noise.Fig. 1 transmits and receives the scenario-frame example for a kind of communication system of the prior art.Wherein, In the receiving loop of this system; First filter is a band pass filter, its can filtering signal be frequency range outside the reception frequency range that takies of whole system promptly with the electromagnetic signal of outer frequency range, the band limits of filtering is the frequency range of a suitable wideband; For comprising under the situation of a plurality of communication channels in the band; Meeting produces adjacent interference frequently between the communication channel, and the electromagnetic interference noise in this communications band needs the filter ability filtering of utmost point arrowband, the scheme that does not have to carry out filtering in the present prior art.The problem that causes thus is, in case disturb near the occupied frequency of other communication channels in the frequency range, the demodulation of the radiofrequency signal of then current communication channel may be seriously influenced.This disturbs and generally is called adjacent interference frequently.The source of disturbing possibly be portable terminal, base station, signal generator etc.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of phase-shift filtering method, is used to solve the problem of the frequency interferences communication channel communication that communication channel closes on, and realizes the high noise immunity of communication channel to the frequency interferences of closing on.
For achieving the above object, technical scheme of the present invention is achieved in that
Based on the embodiment of the invention, the present invention provides a kind of phase-shift filtering method, and this method is used for suppressing at communication system reception/radiating circuit the electromagnetic interference of designated frequency band, and this method comprises:
Through the phase adjusted module two-way phase of input signals difference is regulated, make that the phase difference of two paths of signals in the frequency range of appointment of output is 0 degree, the phase difference outside designated frequency band is 180 degree; Or the phase difference in the frequency range of appointment is 180 degree, and the phase difference designated frequency band outside is 0 to spend.
Based on the embodiment of the invention, the present invention provides another kind of phase-shift filtering method, and this method is used for suppressing at communication system reception/radiating circuit the electromagnetic interference of designated frequency band, and this method comprises:
Receive/send out module reception/emission dual-port signal through the dual-port signal;
Phase difference through the dual-port signal of module reception/emission is received/sent out to the phase adjusted module to said dual-port signal is regulated; The phase difference of two-way signal in designated frequency band that makes said phase adjusted module and said dual-port signal receive/send out between the module is 0 degree, and the phase difference outside designated frequency band is 180 degree; Or the phase difference in designated frequency band is 180 degree, and the phase difference designated frequency band outside is 0 to spend.
Further, said method also comprises:
In receiving path, the two paths of signals of said phase adjusted module output is converted into the single port signal, the signal that the filtering designated frequency band is outer through the synthetic module of separating of power;
In the emission path, through the power decomposing module single port signal is converted into the two-way signal, be input to said phase adjusted module.
Based on the embodiment of the invention, the present invention provides another kind of phase-shift filtering method, and this method is used for suppressing at communication system reception/radiating circuit the electromagnetic interference of designated frequency band, and this method comprises:
Divide success rate equal two paths of signals one-channel signal through the power decomposing module;
Through the phase adjusted module two paths of signals of said power decomposing module output is carried out phase adjusted, making the phase difference of two paths of signals in designated frequency band of regulating back output is 0 degree, and the phase difference designated frequency band outside is 180 to spend; Or the phase difference in designated frequency band is 180 degree, and the phase difference designated frequency band outside is 0 to spend.
Based on the embodiment of the invention, the present invention provides another kind of phase-shift filtering method, and this method is used for suppressing at communication system reception/radiating circuit the electromagnetic interference of designated frequency band, and this method comprises:
Through the phase adjusted module phase place of the two paths of signals of input is regulated, the phase difference of two paths of signals in designated frequency band that makes output is 0 degree, and the phase difference outside designated frequency band is 180 degree; Or the phase difference in designated frequency band is 180 degree, and the phase difference designated frequency band outside is 0 to spend;
The two paths of signals of said phase adjusted module being exported through the power synthesis module is converted into the single port signal, the signal that the filtering designated frequency band is outer.
Based on the embodiment of the invention, the present invention provides another kind of phase-shift filtering method, and this method is used for suppressing at communication system reception/radiating circuit the electromagnetic interference of designated frequency band, and this method comprises:
Divide success rate equal two paths of signals one-channel signal through the power decomposing module;
Through the phase adjusted module two paths of signals of said power decomposing module output is carried out phase adjusted, making the phase difference of two paths of signals in designated frequency band of regulating back output is 0 degree, and the phase difference designated frequency band outside is 180 to spend; Or the phase difference in designated frequency band is 180 degree, and the phase difference designated frequency band outside is 0 to spend;
The two paths of signals of said phase adjusted module being exported through the power synthesis module is converted into the single port signal, the signal that the filtering designated frequency band is outer.
Further, in the above-mentioned phase-shift filtering method, said power decomposing module adopts power splitter or Ba Lun to realize.
Further, in the above-mentioned phase-shift filtering method, said power synthesis module adopts power combiner, Ba Lun or differential low noise amplifier to realize, wherein:
Phase difference in designated frequency band is 0 degree, and the phase difference designated frequency band outside is 180 when spending, and selects the outer signal of power combiner filtering designated frequency band for use, keeps the interior signal of designated frequency band; Or
Phase difference in designated frequency band is 0 degree, and the phase difference designated frequency band outside is 180 when spending, and selects for use Ba Lun or differential low noise amplifier to keep the outer signal of designated frequency band, the signal that the filtering designated frequency band is interior; Or
Phase difference in designated frequency band is 180 degree, and the phase difference designated frequency band outside is 0 when spending, and selects for use power combiner to keep the outer signal of designated frequency band, the signal that the filtering designated frequency band is interior; Or
Phase difference in designated frequency band is 180 degree, and the phase difference designated frequency band outside is 0 when spending, and selects the outer signal of Ba Lun or differential low noise amplifier filtering designated frequency band for use, keeps the interior signal of designated frequency band.
Further, said phase adjusted module is carried out said phase-adjusted method and is:
Through the signal sampling module first via input signal is sampled, sampled signal is exported to the phase control module;
Through phase control module controls digital phase filter device,, the signal phase compensation 180 of said designated frequency band is spent through the phase place that the exponent number of control figure phase filter is regulated the designated frequency band signal;
The second road input signal is directly exported from output port as the output signal.
Further, said phase adjusted module is carried out said phase-adjusted method and is:
Through variable capacitance/inductance control circuit the capacitance/inductance values of variable capacitor/inductance is regulated;
The center frequency point of the filtering through variable capacitor/adjustment of inductance inverse filter;
Under the control of said variable capacitor/inductance, inverse filter is to signal phase compensation 180 degree of designated frequency band;
The second road input signal of said phase-shift filtering device is directly exported from output port as the output signal.
Based on the embodiment of the invention, the present invention provides another kind can suppress the adjacent method of disturbing frequently, and this method comprises:
Use the electromagnetic signal outside the first filter filtering communication system frequency acceptance band;
Use the phase-shift filtering device that the signal of first filter output is carried out phase-shift filtering, the electromagnetic signal outside the filtering designated frequency band;
Single-ended signal to the output of phase-shift filtering device carries out demodulation process.
The present invention is in receiving system; Use the phase adjusted module to the signal in two input ports in designated frequency band with designated frequency band outside phase difference regulate; Make that the phase difference of signal in the frequency range of appointment of two output port outputs is 0 degree, the phase difference outside designated frequency band is 180 degree; Perhaps; The phase difference of phase difference in the frequency range of appointment of the two paths of signals of phase adjusted module output is 180 degree; Phase difference outside designated frequency band is 0 degree, again through the electromagnetic signal outside shared frequency range of power synthesis module filtering designated communication channel or the shared frequency range, thus the electromagnetic noise in the filtering band; The ability of the anti-electromagnetic interference of raising equipment receiving system, the electromagnetic noise of the channel that communication channel is contiguous will be suppressed greatly.The robustness of communication system under complex electromagnetic environment will be strengthened greatly.
Description of drawings
Fig. 1 is the block diagram of the communication system of prior art;
The structural representation of a kind of phase-shift filtering device that Fig. 2 provides for the embodiment of the invention;
The structural representation of a kind of phase-shift filtering device that Fig. 3 provides for the embodiment of the invention;
Fig. 4 is the structural representation that the present invention is based on a kind of phase-shift filtering device that Fig. 3 provides;
Fig. 5 the present invention is based on a kind of communication system block diagram that Fig. 4 provides, and has comprised balancing antenna shown in Figure 4 and phase adjusted module;
Fig. 6 is the structural representation that the present invention is based on the another kind of phase-shift filtering device that Fig. 3 provides;
Fig. 7 is the sketch map that the present invention is based on the dual-port communication system of Fig. 6;
The structural representation of a kind of phase-shift filtering device that Fig. 8 provides for the embodiment of the invention;
The structural representation of a kind of phase-shift filtering device that Fig. 9 provides for the embodiment of the invention
The structural representation of a kind of phase-shift filtering device that Figure 10 provides for the embodiment of the invention;
The block diagram of the communication system that Figure 11 provides for the embodiment of the invention has increased the phase-shift filtering device;
The realization block diagram that passes through the phase-shift filtering device (group) that digital filtering realizes that Figure 12 provides for the embodiment of the invention;
Figure 13 passes through the realization block diagram that inverse filter adds the phase-shift filtering device (group) that variable capacitance (inductance) method realizes for what the embodiment of the invention provided;
The frequency response of the phase-shift filtering device that Figure 14 provides for the embodiment of the invention;
The optimal result of the amplitude response of the signal of single difference output in the phase-shift filtering device that Figure 15 provides for the embodiment of the invention;
The differential signal of exporting in the phase-shift filtering device that Figure 16 provides for the embodiment of the invention directly converts the result behind the single-ended signal into.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, below lift embodiment and with reference to accompanying drawing, to further explain of the present invention.
The structural representation of a kind of phase-shift filtering device that Fig. 2 provides for the embodiment of the invention, this device is applied in the communication system reception/radiating circuit, is used to suppress the adjacent of designated frequency band disturbed frequently, and this device comprises: the phase adjusted module;
Said phase adjusted module is used to regulate the two paths of signals phase difference from the input port input, makes that the phase difference of two paths of signals in the frequency range of appointment of this module output is 0 degree, and the phase difference outside designated frequency band is 180 degree; Or the phase difference in the frequency range of appointment is 180 degree, and the phase difference designated frequency band outside is 0 to spend.
Said phase adjusted module has dual input port and dual output port, and two groups of dual-ports are respectively applied for and being connected of other assembly, and realize phase-adjusted effect.
The signal of the output of said phase-shift filtering device just can be realized corresponding filter effect through a power synthesis module.
Preferably, can comprise one group of phase adjusted module in the said phase-shift filtering device, select signal through which phase adjusted module through adding RF switch.Connected mode is: an end of all phase adjusted modules all links together, and the other end is selected the flow direction of signal through a RF switch.
The structural representation of the another kind of phase-shift filtering device that Fig. 3 provides for the embodiment of the invention, this device comprises: comprises the dual-port signal and receives/send out module and phase adjusted module, wherein:
The dual-port signal is received/module, is used for reception/emission dual-port signal;
The phase adjusted module is used to regulate the dual-port signal and receives/send out the phase difference of signal of two output ports of module, the two paths of signals of output through regulating after is equaled or near 180 degree in the frequency range of appointment, outside said designated frequency band, equals or spends near 0; Perhaps regulate the dual-port signal to receive/phase difference of signal of sending out two output ports of module equals in the frequency range of appointment or near 0 degree, outside said designated frequency band, equals or near 180 degree.
A said dual-port signal receipts/dual-port of a module and a dual-port of phase adjusted module are connected; Another group dual-port of said phase adjusted module is as the external connectivity port of phase-shift filtering device;
Fig. 4 is this embodiment preferred embodiment; In this example; Described dual-port signal receipts/module is a balancing antenna; The differential signal of balancing antenna output is input in the phase adjusted module, and the phase adjusted module is regulated the phase place of the signal of input, make the phase difference of signal of two output ports outputs of phase adjusted module in designated frequency band with the outer anti-phase of designated frequency band (phase difference for equal or spend) near 180.
Fig. 5 has comprised balancing antenna shown in Figure 4 and phase adjusted module for a kind of communication system block diagram that Fig. 4 provides.This system is a receipts/system.
The reception path is: balancing antenna receives after the signal of free space; Carry out the adjustment of phase place through the phase adjusted module; Realize the filter effect of phase-shift filtering module through the power synthesis module; Afterwards, signal gets into first filter and carries out filtering, gets into the reception that the receiving demodulation module is accomplished signal through RF switch again.
The emission path is: the emission modulation module produces after the signal; Pass through RF switch; Get into first filter and carry out filtering; For emission, just become the power decomposing module of transmitter module, signal next to get into the phase adjusted module at the power synthesis module of receiving loop and realized filter effect; This filter effect is united realization (phase adjusted module and the balancing antenna implementation of uniting the filter effect of realization is: the phase adjusted module needs the electromagnetic signal of designated frequency band of filtering owing to changed phase information by the phase adjusted module, therefore just can't launch through balancing antenna) through balancing antenna.
Said communication system is exactly the system that has comprised said reception path and emission path.
Fig. 6 is another preferred embodiment of this embodiment; In this example; Described dual-port signal receives/and to send out a module be that chip is received/sent out to a dual-port signal, and the signal demand of phase adjusted module output guarantees that phase place and the phase difference designated frequency band outside in designated frequency band is 180 to spend.
The signal of the output of said phase-shift filtering device just can be realized corresponding filter effect through a power synthesis module.
Fig. 7 is the sketch map that the present invention is based on the dual-port communication system of Fig. 6.Wherein, the dual-port signal emission module produces the dual-port signal, after the phase shift of phase adjusted module, is received by the dual-port signal receiving module, and the dual-port signal has just been realized filter effect through after the phase adjusted module.The embodiment of this dual-port communication system generally is applied in the occasion of the long haul communication of dual-port signal.
The structural representation of a kind of phase-shift filtering device that Fig. 8 provides for the embodiment of the invention, this device comprises: power decomposing module and phase adjusted module, wherein:
The power decomposing module is used for the two paths of signals that the one-channel signal branch success rate that receives is equal, and the present invention does not do requirement to the phase place of two paths of signals.With the device of rate of doing work decomposing module can be that power splitter, Ba Lun (Balun, balanced-unbalanced transformer) or other can be with the devices of power five equilibrium.
The phase adjusted module is used to receive the two paths of signals of said power decomposing module output, and the phase difference of regulating two paths of signals equals in the frequency range of appointment or near 180 degree, outside said designated frequency band, equals or near 0 degree; Or the phase difference of regulating two paths of signals equals in the frequency range of appointment or near 0 degree, outside said designated frequency band, equals or near 180 degree.Promptly make phase difference from the signal of two ports outputs of said phase adjusted module in designated frequency band with designated frequency band outside phase difference be anti-phase;
The single port place that an external connectivity port of the phase-shift filtering device of this embodiment is the power decomposing module; The dual-port place of power decomposing module connects a dual-port of phase adjusted module, and another group dual-port of phase adjusted module is as the external connectivity port of phase-shift filtering device.
The application scenario of the phase-shift filtering device among this embodiment is that said signal is a single-ended signal; At this moment; Need carry out phase shift and realize filter effect through the phase-shift filtering module, just need to use the power decomposing module that single-ended signal is converted into the dual-port signal earlier, again this dual-port signal input phase adjustment module carried out phase adjusted; And under the situation that this signal receives through dual-port signal receiving chip shown in Figure 7, be suitable for the phase-shift filtering device of present embodiment.
Embodiment 4
Fig. 9 comprises for a kind of phase-shift filtering device that the embodiment of the invention provides: phase adjusted module and power synthesis module, wherein:
The phase adjusted module; Be used to receive outside differential input signal; Two-way phase of input signals difference is regulated, make the phase difference of two paths of signals of this module output in the frequency range of appointment, equal or, outside said designated frequency band, equal or near 0 degree near 180 degree; Or regulate that two-way phase of input signals difference equals or in the frequency range of appointment near 0 degree, outside said designated frequency band, equal or near 180 degree.Promptly make phase difference from the signal of two ports outputs of said phase adjusted module in designated frequency band with designated frequency band outside anti-phase (phase difference is 180 degree);
The power synthesis module; Be used to receive two paths of signals from the output of phase adjusted module; The dual-port signal that transmits between phase adjusted module and the power synthesis module is converted into the single port signal; And when the power synthesis module uses the mode of two paths of signals energy addition, then can the filtering designated frequency band, stay the signal of the frequency range outside the designated frequency band; Mode when the power synthesis module uses the two paths of signals energy to subtract each other then can stay designated frequency band, the frequency band signals outside the filtering designated frequency band.
The application scenario of this phase-shift filtering device is: said input signal is the dual-port signal; At this moment; Need carry out phase shift and realize filter effect through the phase-shift filtering module; And accomplish under the situation of whole filtering the signal behind the phase-shift filtering being converted into single-ended signal, be suitable for the phase-shift filtering device of present embodiment.
Embodiment 5
A kind of phase-shift filtering apparatus structure sketch map that Figure 10 provides for the embodiment of the invention, this device comprises: power decomposing module, phase adjusted module, power synthesis module, wherein:
The input port of this device is the single port of power decomposing module; The dual-port place of power decomposing module connects a dual-port of phase adjusted module; Another group dual-port of phase adjusted module connects the dual-port of said signal synthesizing module, and the single port of power synthesis module is external connectivity port.
The power decomposing module is used for power is divided into equal two parts, transmits through two-way, and phase place is not done requirement.Can be that power splitter, Ba Lun or other can be with the devices of power five equilibrium with the device of rate of doing work decomposing module.
Phase adjusted module, the phase difference of signal that is used to regulate two output ports of power decomposing module equal in the frequency range of appointment or near 180 degree, outside said designated frequency band, equal or near 0 degree; In the frequency range of appointment, equal or near 0 the degree, outside said designated frequency band, equal or near 180 the degree.Promptly make phase difference from the signal of two ports outputs of said phase adjusted module in designated frequency band with designated frequency band outside anti-phase (phase difference equal or near 180 degree).
The power synthesis module is used for the dual-port signal that transmits between phase adjusted module and the power synthesis module is converted into the single port signal, and the energy of the frequency range that needs filtering is subtracted each other, and needs the energy addition of the frequency range of reservation, thereby realizes filter effect.
In the frequency range of phase difference in appointment of the two paths of signals that the phase adjusted module is exported, equal 180 degree; Outside designated frequency band, equal 0 when spending; If the power synthesis module uses the mode of two paths of signals energy addition, then can the filtering designated frequency band, stay the signal of all the other frequency ranges.Device with this type of function is power combiner (in fact being exactly that power splitter uses conversely) for example.
In the frequency range of phase difference in appointment of the two paths of signals that the phase adjusted module is exported, equal 180 degree; Outside designated frequency band, equal 0 when spending; If the mode that the power synthesis module uses the two paths of signals energy to subtract each other then can stay designated frequency band, the signal of all the other frequency ranges of filtering.Device with this type of function is differential signal synthesizer (in fact being exactly that Ba Lun uses conversely) for example.
Embodiment 6
But the system construction drawing of electromagnetic interference noise appears in adjacent channel in a kind of filtering communications band band of realizing based on phase-shift filtering device that Figure 10 provided that Figure 11 provides for the embodiment of the invention, and this system comprises:
Antenna is used for emission or receives the wireless electromagnetic signal;
Duplexer or duplexer are used to distinguish the residing state of communication system, are used for gating launching circuit and receiving loop;
First filter is used to receive the radio signal that is transmitted by antenna, and from the signal that is received the interference signal outside the filtering communication system frequency acceptance band.The frequency band (abbreviating passband as) of this first filter institute gating is the whole reception frequency range of communication system, in this frequency band range, comprises one or more communication channels (perhaps also can be referred to as channel);
The phase-shift filtering device is used for the signal of first filter output is carried out phase-shift filtering, the frequency range outside the filtering designated frequency band.
The receiving demodulation device is used for the single-ended signal of phase-shift filtering device output is carried out demodulation process.
In this system example, the structure of employed phase-shift filtering device is as shown in Figure 7, comprising: power decomposing module, phase adjusted module, power synthesis module, wherein:
The single-ended signal of first filter output is input to the power decomposing module; Be decomposed into the two-way constant-amplitude signal that the differential phase difference is anti-phase by the power decomposing module; If said power decomposing module adopts power splitter to realize; Differential phase difference after then decomposing is 0 degree, if said power decomposing module adopts Ba Lun to realize, the differential phase difference after then decomposing is 180 degree;
Adopt in said power decomposing module under the situation of power splitter realization, the power synthesis module adopts the mode of signal subtraction, promptly selects the signal outside Ba Lun or the differential low noise amplifier filtering designated frequency band for use.The phase difference that is the output of power decomposing module is the signal of 0 degree; Through phase adjusted module (group) phase difference between the frequency range of current communication channel and the frequency range outside the current communication channel frequency range is adjusted into 180 degree; After the power synthesis module is with the two paths of signals addition, the target signal filter on the frequency range outside the current communication channel frequency range is fallen then.
Adopt in said power decomposing module under the situation of Ba Lun or the realization of differential low noise amplifier; The power synthesis module adopts the mode of signal plus, promptly selects the signal outside power combiner (input and output of power splitter are used conversely and got final product) the filtering designated frequency band for use.The phase difference of power decomposing module output be the signal of 180 degree through phase adjusted module (group), the differential phase difference of current communication channel is become 0 spends; After the power synthesis module subtracts each other two paths of signals, the target signal filter on the frequency range outside the current communication channel frequency range is fallen then.
Embodiment 7
The implementation structure figure of a kind of phase-shift filtering device that Figure 12 provides for the embodiment of the invention, the power decomposing module is used power splitter among this embodiment, the power synthesis module use differential low noise amplifier (Differential Low Noise Amplifier, DLNA).This embodiment selects the reason of power splitter rather than Ba Lun to be: selects Ba Lun, then requires the differential phase of the signal outside the channel need be converted into 0 degree, and this wider range, difficult control, so what select in the present case is power splitter.Select power splitter then only need the differential phase of this channel be become 180 degree and get final product, the frequency range that need handle is narrower, is easier to realize.
Among this embodiment, the phase adjusted module is only handled one road signal of power decomposing module output, and another road signal is directly exported, and this module specifically comprises: signal sampling module, digital phase filter device, phase control module;
The signal sampling module is used for one tunnel output signal of power decomposing module is sampled, and the one of which end is connected with the power decomposing module, and the other end is connected with the phase control module; Obtaining the signals sampling result is the prerequisite of carrying out digital filtering.
The digital phase filter device is used under the control of phase-control circuit signal phase compensation 180 degree to designated frequency band, and the one of which end is connected with the power decomposing module, and an end is connected with the power synthesis module, and the other end is connected with the phase control module.
The present invention selects the phase place of digital filter is controlled; Rather than amplitude controlled, the reason of promptly directly carrying out filtering is: directly carry out filtering, then need digital filter design to become a lot of rank; Cause the instability of phase information, also can produce the very big time-delay of signal processing in addition.Therefore, the way that the present invention takes is with phase compensation 180 degree in one tunnel the channel frequency of power splitter output, can use minimum digital filter exponent number just can accomplish filtering like this, the complexity of reduction digital filter.
The phase control module is used for the exponent number of control figure phase filter to regulate the phase place of designated frequency band signal, and the one of which end is connected with the signal sampling module, and the other end is connected with the digital phase filter device; Through the digital phase filter device, phase change information is loaded on one road signal path of power splitter output.The digital phase filter device can be selected for use, and for example 1 to 2 rank Butterworth filter adds that linear phase filter carries out the fine setting of time delay.Other digital filter way of realization also is fine, as long as the phase place of the signal of channel is carried out 180 degree anti-phases.
The implementation structure figure of the another kind of phase-shift filtering device that Figure 13 provides for the embodiment of the invention, this embodiment is that with the different of embodiment 7 implementation of phase adjusted module is different.This embodiment adds the phase adjusting device (group) that variable capacitance/inductance method is realized through inverse filter.Compare with the implementation of the digital filtering of phase-shift filtering device; Digital filter is easy to realize filter (group); And can cover wider frequency, and directly use the bank of filters that constitutes by hardware will face the little problem of bandwidth coverage, therefore; The present invention proposes to use variable capacitance/inductance to regulate the inverse filter working frequency range, makes it lucky and current receive channel and overlaps.The realization principle of phase adjusted module is identical with the realization principle of phase adjusted module among the embodiment 7 among this embodiment, and the phase adjusted module comprises among this embodiment:
Variable capacitance/inductance control circuit is used for the capacitance of variable capacitor is regulated, and the one of which end is connected with the power decomposing module, and the other end is connected with variable capacitor/inductance;
Variable capacitor/inductance is used to regulate the center frequency point of the filtering of inverse filter;
Inverse filter is used under the control of variable capacitor/inductance signal phase compensation 180 degree to designated frequency band, and the one of which end is connected with the power decomposing module, and an end is connected with the power synthesis module, and an end is connected with variable capacitor/inductance.Can select 1 to 2 rank Butterworth filter for use, add that linear phase filter carries out the fine setting of time delay, the differential phase that obtains final filter change signal is poor.
Embodiment 9
Figure 14 describes is the optimal situation of differential phase of the dual-port differential signal that passes through phase shift of phase-shift filtering module output, wherein, and f
1And f
2Be the highest frequency and the low-limit frequency of current communication channel, this channel only is the part of whole communication system receiving unit bandwidth.At f
1And f
2Between frequency band, the phase difference of differential channel keeps original 180 degree through Ba Lun, and the signal of all the other frequencies is set to 0 degree (if use power splitter, then at f
1And f
2Between frequency band, the phase difference of differential channel is set to 180 degree, and the signal of all the other frequencies is set to keep originally 0 degree through power splitter).The scope of can accepting is f
1And f
2Between the differential phase difference absolute value from 90 spend to 180 the degree (angular range need be limited in the 0-180 degree, negative angle add 180 the degree just can be converted into positive-angle), f
1And f
2Outside the absolute value acceptable scope of differential phase difference of frequency range be 0 to spend to 90 degree (angular range need be limited between the 0-180 degree, and negative angle adds that 180 degree just can be converted into positive-angle).
The optimal situation of the energy attenuation of differential signal shown in Figure 15, because be differential lines, energy is divided equally on two lines, therefore, the decling phase on two lines for former single-ended signal all is-3dB.
Shown in Figure 16 is has the result's behind differential signal synthetic of characteristic of Figure 14 and Figure 15 optimal situation.
Composite formula is:
For the situation of 2 ports and 3 port signal phase place anti-phases, the power composite formula is:
Wherein, the differential mode S of the present invention's requirement
123Phase information shown in figure 14, amplitude information is shown in figure 16, S
12The wherein amplitude and the phase information of one tunnel differential lines have been carried, S
13The amplitude and the phase information of another road differential lines have been carried.
For 2 ports and the identical situation of 3 port signal phase places, the power composite formula is:
Wherein, because common-mode signal S
12And S
13Amplitude very near with differential phase be 0 the degree, can find out common mode S by the formula of common-mode signal
123Will greatly decay.
Can see f
1And f
2, just the signal of the interior frequency of current communication channel can be found out according to the formula of difference mode signal not have decay because be difference mode signal, and f
1Below and f
2Above signal is a common-mode signal, and the formula according to common-mode signal decays to minus infinity.Consider actual conditions, synthetic back f
1And f
2Between have certain decay, for example, about-0.5dB, this to the influence of actual reception of signal little (the acceptable scope from 0dB to-10dB).And f
1Below and f
2The decay of above signal can really not be a minus infinity also, but the rate depreciation also can be a bigger value, and for example, about-20dB, and this has been can play beneficial effect fully (the acceptable scope is from-5dB to-∞ dB) in the application of reality.
In addition; The realization of phase adjusting device (group) can be to use lumped device; Resonator filter, digital filter take perhaps differential lines wherein one delay time (but being not limited to the above method) realized phase adjusting device (group) that realization principle is that the amplitude information of the single differential lines of final phase adjusting device (group) realization meets shown in Figure 15; The differential phase information conforms is shown in Figure 14, and the amplitude information of the single-ended signal after synthesizing meets shown in Figure 16.
The scope that the present invention uses comprises that all have the communication system of the non-single channel of certain communications band.Include but not limited to digital television system, simulated television system, FM broadcast system, gsm communication system, cdma communication system, WCDMA communication system, TD-SCDMA communication system, TD-LTE communication system, FDD-LTE communication system or the like.
The present invention relates to through changing the problem that signal phase information is carried out the filtering of inband signaling; Broken through the effect that can't realize in the prior art; Its case study on implementation is not limited to part involved in the present invention, with the similar implementation of above-mentioned design all in protection scope of the present invention.
Claims (12)
1. phase-shift filtering method, this method are used for suppressing at communication system reception/radiating circuit the electromagnetic interference of designated frequency band, it is characterized in that this method comprises:
Through the phase adjusted module two-way phase of input signals difference is regulated, make that the phase difference of two paths of signals in the frequency range of appointment of output is 0 degree, the phase difference outside designated frequency band is 180 degree; Or the phase difference in the frequency range of appointment is 180 degree, and the phase difference designated frequency band outside is 0 to spend.
2. phase-shift filtering method, this method are used for suppressing at communication system reception/radiating circuit the electromagnetic interference of designated frequency band, it is characterized in that this method comprises:
Receive/send out module reception/emission dual-port signal through the dual-port signal;
Phase difference through the dual-port signal of module reception/emission is received/sent out to the phase adjusted module to said dual-port signal is regulated; The phase difference of two-way signal in designated frequency band that makes said phase adjusted module and said dual-port signal receive/send out between the module is 0 degree, and the phase difference outside designated frequency band is 180 degree; Or the phase difference in designated frequency band is 180 degree, and the phase difference designated frequency band outside is 0 to spend.
3. phase-shift filtering method according to claim 2 is characterized in that, said method also comprises:
In receiving path, the two paths of signals of said phase adjusted module output is converted into the single port signal, the signal that the filtering designated frequency band is outer through the synthetic module of separating of power;
In the emission path, through the power decomposing module single port signal is converted into the two-way signal, be input to said phase adjusted module.
4. phase-shift filtering method, this method are used for suppressing at communication system reception/radiating circuit the electromagnetic interference of designated frequency band, it is characterized in that this method comprises:
Divide success rate equal two paths of signals one-channel signal through the power decomposing module;
Through the phase adjusted module two paths of signals of said power decomposing module output is carried out phase adjusted, making the phase difference of two paths of signals in designated frequency band of regulating back output is 0 degree, and the phase difference designated frequency band outside is 180 to spend; Or the phase difference in designated frequency band is 180 degree, and the phase difference designated frequency band outside is 0 to spend.
5. phase-shift filtering method, this method are used for suppressing at communication system reception/radiating circuit the electromagnetic interference of designated frequency band, it is characterized in that this method comprises:
Through the phase adjusted module phase place of the two paths of signals of input is regulated, the phase difference of two paths of signals in designated frequency band that makes output is 0 degree, and the phase difference outside designated frequency band is 180 degree; Or the phase difference in designated frequency band is 180 degree, and the phase difference designated frequency band outside is 0 to spend;
The two paths of signals of said phase adjusted module being exported through the power synthesis module is converted into the single port signal, the signal that the filtering designated frequency band is outer.
6. phase-shift filtering method, this method are used for suppressing at communication system reception/radiating circuit the electromagnetic interference of designated frequency band, it is characterized in that this method comprises:
Divide success rate equal two paths of signals one-channel signal through the power decomposing module;
Through the phase adjusted module two paths of signals of said power decomposing module output is carried out phase adjusted, making the phase difference of two paths of signals in designated frequency band of regulating back output is 0 degree, and the phase difference designated frequency band outside is 180 to spend; Or the phase difference in designated frequency band is 180 degree, and the phase difference designated frequency band outside is 0 to spend;
The two paths of signals of said phase adjusted module being exported through the power synthesis module is converted into the single port signal, the signal that the filtering designated frequency band is outer.
7. according to claim 4 or 6 described phase-shift filtering methods, it is characterized in that said power decomposing module adopts power splitter or Ba Lun to realize.
8. according to claim 5 or 6 described phase-shift filtering methods, it is characterized in that said power synthesis module adopts power combiner, Ba Lun or differential low noise amplifier to realize, wherein:
Phase difference in designated frequency band is 0 degree, and the phase difference designated frequency band outside is 180 when spending, and selects the outer signal of power combiner filtering designated frequency band for use, keeps the interior signal of designated frequency band; Or
Phase difference in designated frequency band is 0 degree, and the phase difference designated frequency band outside is 180 when spending, and selects for use Ba Lun or differential low noise amplifier to keep the outer signal of designated frequency band, the signal that the filtering designated frequency band is interior; Or
Phase difference in designated frequency band is 180 degree, and the phase difference designated frequency band outside is 0 when spending, and selects for use power combiner to keep the outer signal of designated frequency band, the signal that the filtering designated frequency band is interior; Or
Phase difference in designated frequency band is 180 degree, and the phase difference designated frequency band outside is 0 when spending, and selects the outer signal of Ba Lun or differential low noise amplifier filtering designated frequency band for use, keeps the interior signal of designated frequency band.
9. according to each described phase-shift filtering method of claim 1 to 6, it is characterized in that said phase adjusted module is carried out said phase-adjusted method and is:
Through the signal sampling module first via input signal is sampled, sampled signal is exported to the phase control module;
Through phase control module controls digital phase filter device,, the signal phase compensation 180 of said designated frequency band is spent through the phase place that the exponent number of control figure phase filter is regulated the designated frequency band signal;
The second road input signal is directly exported from output port as the output signal.
10. according to each described phase-shift filtering method of claim 1 to 6, it is characterized in that said phase adjusted module is carried out said phase-adjusted method and is:
Through variable capacitance/inductance control circuit the capacitance/inductance values of variable capacitor/inductance is regulated;
The center frequency point of the filtering through variable capacitor/adjustment of inductance inverse filter;
Under the control of said variable capacitor/inductance, inverse filter is to signal phase compensation 180 degree of designated frequency band;
The second road input signal of said phase-shift filtering device is directly exported from output port as the output signal.
11. one kind can be suppressed the adjacent method of disturbing frequently, it is characterized in that this method comprises:
Use the electromagnetic signal outside the first filter filtering communication system frequency acceptance band;
Use the phase-shift filtering device that the signal of first filter output is carried out phase-shift filtering, the electromagnetic signal outside the filtering designated frequency band;
Single-ended signal to the output of phase-shift filtering device carries out demodulation process.
12. a kind of method that can suppress adjacent frequency interference according to claim 11 is characterized in that the said phase-shift filtering device that uses is the described phase-shift filtering device of claim 6.
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| CN201210039511.5A CN102611469B (en) | 2012-02-21 | 2012-02-21 | A kind of phase-shift filtering method |
| PCT/CN2012/074131 WO2013123706A1 (en) | 2012-02-21 | 2012-04-16 | Phase-shift filter method |
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| CN201210039511.5A CN102611469B (en) | 2012-02-21 | 2012-02-21 | A kind of phase-shift filtering method |
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| CN103595366A (en) * | 2013-10-17 | 2014-02-19 | 天津大学 | Second-order dot matrix balun of 0.6-1.2GHz CMOS |
| CN104078766A (en) * | 2013-03-29 | 2014-10-01 | 富士通天株式会社 | Antenna device and radar device |
| CN104122273A (en) * | 2014-07-11 | 2014-10-29 | 电子科技大学 | Radiometer based on multichannel frequency band synthesis |
| CN106911197A (en) * | 2017-05-02 | 2017-06-30 | 佛山职业技术学院 | A kind of simple environment electromagnetics signal acceptance method |
| CN108400774A (en) * | 2018-03-22 | 2018-08-14 | 上海唯捷创芯电子技术有限公司 | A kind of balanced type radio-frequency power amplifier, chip and communication terminal |
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| WO2013123706A1 (en) | 2013-08-29 |
| CN102611469B (en) | 2016-06-08 |
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