CN101710836B - Frequency sweep device and frequency sweep method - Google Patents
Frequency sweep device and frequency sweep method Download PDFInfo
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- CN101710836B CN101710836B CN2009102378254A CN200910237825A CN101710836B CN 101710836 B CN101710836 B CN 101710836B CN 2009102378254 A CN2009102378254 A CN 2009102378254A CN 200910237825 A CN200910237825 A CN 200910237825A CN 101710836 B CN101710836 B CN 101710836B
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Abstract
The invention relates to a frequency sweep device and a frequency sweep method. The frequency sweep device comprises a multi-path option switch, a first processing unit, a second processing unit and an intermediate frequency filter unit, wherein the multi-path option switch is connected with the first processing unit and the second processing unit respectively and is used for communicating with different active links according to the frequency band of a signal to be tested; the first processing unit is used for performing filtering, amplification, secondary filtering and frequency mixing on the received radio-frequency signals at a first frequency band in turn, and then outputting the radio-frequency signals at the first frequency band to the intermediate frequency filter unit; the second processing unit is used for performing filtering, amplification, secondary filtering and frequency mixing on the received radio-frequency signals at a second frequency band in turn, and then outputting the radio-frequency signals at the second frequency band to the intermediate frequency filter unit; and the intermediate frequency filter unit is used for performing intermediate frequency filtering on the signals after the frequency mixing and then outputting the signals. The frequency sweep device and the frequency sweep method can simultaneously support a plurality of frequency bands of TDD, have low requirements on middle devices, and can effectively reduce the cost.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of frequency-sweeping apparatus and the frequency sweeping method that can support simultaneously a plurality of frequency ranges of time division duplex (TimeDivision Duplex, TDD).
Background technology
Frequency spectrum resource is the basic strategic resource of wireless communication system, and sufficient frequency spectrum resource is the assurance of mobile communications network business development.Along with reaching its maturity and commercialization of 3G (Third Generation) Moblie technology (3G), the frequency that is allocated at present 3G is total to 505MHz, and wherein, the duplexing bandwidth of FDD (Frequency Division Duplexing (FDD)) amounts to 350MHz, accounts for 69.3% of all 3G frequencies; TDD (time division duplex) bandwidth amounts to 155MHz, accounts for 30.7% of all 3G frequencies.And in these two kinds of working methods, TDD has the very high availability of frequency spectrum and application flexibility.
In actual use, the TDD bandwidth is divided for three sections, i.e. A (1880M-1920M), B (2010M-2025M) and C (2300M-2400M).And because the fast development of mobile communication, the quick progress of ICT (information and communication technology) (ICT), the industrial advantage of TDD highlights day by day at present, so that TDD has obtained very large attention, thereby be used for testing the frequency-sweeping apparatus of TDD different frequency range signal parameter also from requiring only to support the B section to be upgraded to requirement support A, B and three frequency ranges of C.
Existing conventional frequency-sweeping apparatus can support two frequency ranges of A, B as example take it as shown in Figure 1; This frequency-sweeping apparatus comprises band pass filter (BPF), low noise amplifier (LNA), power amplifier (AMP), frequency mixer (MIXER) and intermediate-frequency filter (IF FILTER); Wherein, radiofrequency signal is inputted by rf input port, through after the band-pass filter of 1880M-2025M, the signal that keeps 1880M-2025M, then after this signal amplifies through LNA, AMP through 1880M-2025M amplifies again, radiofrequency signal after wherein this time amplifying generally has secondary, three inferior interference signals, so the signal after the AMP amplification is carried out filtering through the 1880M-2025M band pass filter, filtered signal sends into frequency mixer and local oscillation signal carries out mixing, sends into intermediate-frequency filter again and exports at last intermediate-freuqncy signal.
But if adopt this routine frequency-sweeping apparatus to support simultaneously A (1880M-1920M), B (2010M-2025M) and three frequency ranges of C (2300M-2400M), then these three frequency ranges will inevitably share same link; And if three frequency ranges share same links, if then local frequency is selected improperly, will cause three interference aggravations between the frequency range; And because same device is different at gain or the Insertion Loss of different frequency range, this just causes the intermediate frequency output of last several frequency ranges to differ greatly easily, thereby affects the frequency sweep function; Simultaneously, then too high for the bandwidth of a device such as filter requirement relevant in this frequency-sweeping apparatus if three frequency ranges share a link, thus increased greatly cost.
Summary of the invention
In view of this, the invention provides a kind of frequency-sweeping apparatus and frequency sweeping method, can support simultaneously a plurality of frequency ranges of time division duplex, and guaranteed that the last intermediate frequency output size of a plurality of frequency ranges approaches, lower for the requirement of device in the device simultaneously, effectively reduce cost.
For addressing the above problem, technical scheme provided by the invention is as follows:
A kind of frequency-sweeping apparatus comprises: multidiameter option switch, the first processing unit, the second processing unit and intermediate frequency filtering unit; Wherein,
Described multidiameter option switch links to each other with the second processing unit with described the first processing unit respectively, is used for according to the residing frequency range of signal to be tested radiofrequency signal being exported to described the first processing unit or the second processing unit;
Described the first processing unit is used for the radiofrequency signal that is in the first frequency range that receives is carried out filtering, and will through the radiofrequency signal of filtering amplify with secondary filtering after, itself and local oscillation signal are carried out mixing, export to again described intermediate frequency filtering unit;
Described the second processing unit is used for the radiofrequency signal that is in the second frequency range that receives is carried out filtering, and will through the radiofrequency signal of filtering amplify with secondary filtering after, itself and local oscillation signal are carried out mixing, export to again described intermediate frequency filtering unit;
Described intermediate frequency filtering unit links to each other with the second processing unit with described the first processing unit respectively, is used for the signal after the mixing is carried out exporting behind the intermediate frequency filtering.
A kind of frequency sweeping method comprises:
Many active links are set, every frequency range that active link is corresponding different;
According to measured signal frequency range of living in radiofrequency signal is outputed on the corresponding active link of this frequency range;
According to frequency range corresponding to this active link the radiofrequency signal of input is carried out filtering, and after filtering, carry out successively low noise amplification, power amplification and secondary filtering, again itself and local oscillation signal are carried out mixing and export by intermediate frequency filtering.
Can find out, adopt frequency-sweeping apparatus of the present invention and frequency sweeping method, by many active links being set with the different frequency range of correspondence, when testing, frequency range according to need test signal place is communicated with different active links, utilize the repeatedly outer interference signal of the described frequency range of filtering of a plurality of filters, output after in conjunction with a plurality of amplifiers radiofrequency signal being amplified simultaneously, and will export to finish the follow-up signal processing through intermediate frequency filtering again after radiofrequency signal and the local oscillation signal mixing, thereby make this frequency-sweeping apparatus can support a plurality of frequency ranges of TDD; And guarantee that by increasing attenuator the size of intermediate frequency output signal is close on this basis; Adopt this kind structure lower to the requirement on devices in installing, and then can greatly save cost.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the composition schematic diagram of existing conventional frequency-sweeping apparatus;
Fig. 2 is the composition structural representation of the frequency-sweeping apparatus of the embodiment of the invention 1;
Fig. 3 is the composition structural representation of the frequency-sweeping apparatus of the embodiment of the invention 2;
Fig. 4 is the composition structural representation of the frequency-sweeping apparatus of the embodiment of the invention 3;
Fig. 5 is the composition structural representation of the frequency-sweeping apparatus of the embodiment of the invention 4;
Fig. 6 is the composition structural representation of the frequency-sweeping apparatus of the embodiment of the invention 5;
Fig. 7 is the composition structural representation of the frequency-sweeping apparatus of the embodiment of the invention 6;
Fig. 8 is the composition structural representation of the frequency-sweeping apparatus of the embodiment of the invention 7;
Fig. 9 is the composition structural representation of the frequency-sweeping apparatus of the embodiment of the invention 8;
Figure 10 is the method flow schematic diagram of the embodiment of the invention 9.
Embodiment
Basic thought of the present invention is take radio frequency mixing principle as the basis, many active links are set with the different frequency range of correspondence in frequency-sweeping apparatus, when testing, the different active link of Frequency Band Selection according to need test signal place carries out the signal processing, thereby makes this frequency-sweeping apparatus can support a plurality of frequency ranges of TDD; And guarantee that by increasing attenuator the size of intermediate frequency output signal is close on this basis; Adopt this kind structure lower to the requirement on devices in installing, and then can greatly save cost.
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described; Obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The embodiment of the invention 1 provides a kind of frequency-sweeping apparatus, and as shown in Figure 2, this frequency-sweeping apparatus comprises: multidiameter option switch 210, the first processing unit 220, the second processing unit 230 and intermediate frequency filtering unit 240; Wherein,
Described multidiameter option switch 210 links to each other with the second processing unit 230 with described the first processing unit 220 respectively, be used for the radiofrequency signal of input is switched, namely according to the residing frequency range of signal to be tested this radiofrequency signal exported to described the first processing unit 220 or the second processing unit 230; Concrete, when described signal to be tested is in the first frequency range, the radiofrequency signal of described input is exported to described the first processing unit 220; When described signal to be tested is in the second frequency range, the radiofrequency signal of described input is exported to described the second processing unit 230; In the specific implementation, the radio-frequency (RF) switch that described multidiameter option switch 210 can switch for being responsible for radiofrequency signal, but be not limited to this; Take radio-frequency (RF) switch as example, radiofrequency signal is by the input port input of radio-frequency (RF) switch, and by delivery outlet output, the input port of radio-frequency (RF) switch is one the tunnel, and delivery outlet is multichannel, but one tunnel output can only be arranged simultaneously; Generally, this radio-frequency (RF) switch can be by voltage control, and the selection of radio-frequency (RF) switch is that the switching way of controlling is as required determined, what also namely come to determine according to band support, if for example signal to be tested may be in three different frequency ranges, then the measured signal for different frequency range just has three kinds of different active links, thereby this radio-frequency (RF) switch also just needs control three tunnel, therefore the radio-frequency (RF) switch of selecting should can control three the tunnel at least, and the voltage control line of radio-frequency (RF) switch is wanted two-way at least;
Described the first processing unit 220 is used for the radiofrequency signal that is in the first frequency range that receives is carried out filtering, and will through the radiofrequency signal of filtering amplify with secondary filtering after, itself and local oscillation signal are carried out mixing, export to again described intermediate frequency filtering unit 240;
Described the second processing unit 230 is used for the radiofrequency signal that is in the second frequency range that receives is carried out filtering, and will through the radiofrequency signal of filtering amplify with secondary filtering after, itself and local oscillation signal are carried out mixing, export to again described intermediate frequency filtering unit 240;
Described intermediate frequency filtering unit 240 links to each other with the second processing unit 230 with described the first processing unit 220 respectively, is used for the signal after the mixing is carried out exporting behind the intermediate frequency filtering.Usually in the specific implementation, this intermediate frequency filtering unit 240 can be intermediate-frequency filter, but those skilled in the art readily understand that it is not limited to this, and this paper repeats no more.
On the basis of above-described embodiment 1, the embodiment of the invention 2 also provides a kind of frequency-sweeping apparatus, as shown in Figure 3, the basic structure of frequency-sweeping apparatus is similar in the basic structure of this frequency-sweeping apparatus and above-described embodiment 1, difference is that described the second processing unit 230 supports C (2300～2400M) frequency ranges, and this second processing unit 230 also can include but are not limited to:: the first band pass filter (BPF) 231 that connects successively, low noise amplifier (LNA) 232, power amplifier (AMP) 233, the second band pass filter (BPF) 234 and frequency mixer (MIXER) 235; Wherein, the band of described the first band pass filter 231 and the second band pass filter 234 is logical is 2300-2400M; Utilize the composition structure of frequency-sweeping apparatus described in the present embodiment; when carrying out frequency sweep; if signal to be tested is in C (2300M-2400M) frequency range; then described multidiameter option switch 210 is communicated with described the second processing unit 230; described radiofrequency signal is via the rf input port input of described multidiameter option switch 210 by the second processing unit 230; through after the first band-pass filter 231 of 2300M-2400M; the signal that keeps 2300M-2400M; then this signal is through after the amplification of LNA232; AMP233 through 2300M-2400M amplifies again; radiofrequency signal after wherein this time amplifying has interference signal usually; so the signal demand after AMP233 amplifies carries out secondary filtering through the second band pass filter 234 of 2300M-2400M; signal behind the secondary filtering is sent into frequency mixer 235 and is carried out mixing with local oscillation signal; send into again intermediate frequency filtering unit 240 last output intermediate-freuqncy signals; process to finish follow-up signal, and then finish frequency sweep work.
At above-described embodiment 1, on 2 the basis, the embodiment of the invention 3 also provides a kind of frequency-sweeping apparatus, as shown in Figure 4, the basic structure of frequency-sweeping apparatus is similar in the basic structure of this frequency-sweeping apparatus and above-described embodiment, difference is that described the first processing unit 220 supports A (1880M-1920M) and two frequency ranges of B (2010M-2025M) simultaneously, and this first processing unit 220 also can include but are not limited to:: the band pass filter (BPF) 221 that connects successively, low noise amplifier (LNA) 222, power amplifier (AMP) 223, band pass filter (BPF) 224 and frequency mixer (MIXER) 225; Wherein,
The passband of described band pass filter 221 and band pass filter 224 all is 1880-2025M; The sensitivity of low noise amplifier 222 is very high, can accept very faint signal, and the linearity is fine; Utilize the composition structure of frequency-sweeping apparatus described in the present embodiment; when carrying out frequency sweep; if signal to be tested is in A (1880M-1920M) frequency range or B (2010M-2025M) frequency range; then described multidiameter option switch 210 is communicated with described the first processing unit 220; described radiofrequency signal is via the rf input port input of described multidiameter option switch 210 by the first processing unit 220; through after the band-pass filter 221 of 1880M-2025M; the signal that keeps 1880M-2025M; then this signal is through after the amplification of LNA222; AMP223 through 1880M-2025M amplifies again; radiofrequency signal after wherein this time amplifying has interference signal usually; so the signal demand after AMP223 amplifies carries out secondary filtering through the band pass filter 224 of 1880M-2025M; signal behind the secondary filtering is sent into frequency mixer 225 and is carried out mixing with local oscillation signal; send into again intermediate frequency filtering unit 240 last output intermediate-freuqncy signals; process to finish follow-up signal, and then finish sweep check work.
In addition, on the basis of above-described embodiment, the embodiment of the invention 4 also provides a kind of frequency-sweeping apparatus, as shown in Figure 5, the basic structure of frequency-sweeping apparatus is similar in the basic structure of this frequency-sweeping apparatus and above-described embodiment, difference is three tunnel radio-frequency (RF) switch at described multidiameter option switch 210, described the first processing unit 220 also can include but are not limited to:: band pass filter (BPF) 221a that connects successively, low noise amplifier (LNA) 222a, power amplifier (AMP) 223a, band pass filter (BPF) 224a and frequency mixer (MIXER) 225a, and band pass filter (BPF) 221b that connects successively, low noise amplifier (LNA) 222b, power amplifier (AMP) 223b, band pass filter (BPF) 224b and frequency mixer (MIXER) 225b; Wherein,
The band of described BPF221a and BPF224a is logical to be 1880～1920M, and the band of described BPF221b and BPF224b is logical to be 2010～2025M; When carrying out frequency sweep, if signal to be tested is in A (1880M-1920M) frequency range, then radiofrequency signal is by passing through successively BPF221a, LNA222a, AMP223a, BPF224a and MIXER225a after three tunnel radio-frequency (RF) switch 210, wherein each device is for similar in the processing of radiofrequency signal and the various embodiments described above, difference is that wherein the frequency range of each device processing will for all being 1880～1920M, specifically repeat no more herein; In like manner, (2010～2025M) time, its processing procedure is also similar to the above, does not repeat them here when signal to be tested is in B.
In addition, on the basis of above-described embodiment, the embodiment of the invention 5 also provides a kind of frequency-sweeping apparatus, as shown in Figure 6, the basic structure of frequency-sweeping apparatus is similar in the basic structure of this frequency-sweeping apparatus and above-described embodiment 1, difference is three tunnel radio-frequency (RF) switch at described multidiameter option switch 210, described the first processing unit 220 also can include but are not limited to:: band pass filter (BPF) 221a that connects successively, low noise amplifier (LNA) 222a, power amplifier (AMP) 223c, band pass filter (BPF) 224c and frequency mixer (MIXER) 225c, and the band pass filter in parallel with BPF221a and LNA222a (BPF) 221b and low noise amplifier (LNA) 222b, described LNA222b also is connected with described AMP223c; Wherein,
The band of described BPF221a is logical to be 1880～1920M, and the band of described BPF221b is logical to be 2010～2025M, and the band of described BPF224c is logical to be 1880～2025M; When carrying out frequency sweep, if signal to be tested is in A (1880M-1920M) frequency range, then radiofrequency signal is by passing through successively BPF221a, LNA222a, AMP223c, BPF224c and MIXER225c after three tunnel radio-frequency (RF) switch 210, wherein each device specifically repeats no more for similar in the processing of radiofrequency signal and the various embodiments described above herein; In like manner, (during 2010～2025M) frequency range, its processing procedure is also similar to the above, does not repeat them here when signal to be tested is in B.
It should be noted that, in the specific implementation, band pass filter in the various embodiments described above can be the Surface Acoustic Wave Filter of the logical scope of different band, this filter only has an input port and a delivery outlet, radiofrequency signal is inputted from the input port, after the delivery outlet output, can the unwanted interference signal of elimination: for example be in A (during 1880～1920M) frequency range when signal to be tested, radio-frequency (RF) switch switched to the filter that comprises 1880～1920M and (described for convenient this moment, referred to as the A road), the signal that this moment, actual needs was processed should be in the 1880M-1920M frequency band, but from the external signal of system have but outside the 1880M-1920M frequency band, and this part signal tends to the index parameter of system is produced negative impact, but therefore pass through all out-of-band signals of establishment 1880M-1920M of Surface Acoustic Wave Filter, so that the signal in the 1880M-1920M frequency band is passed through smoothly.Wherein, because the gain of low noise amplifier is usually all very high, noise is very little, sensitivity is good, and index is good, thereby adopts low noise amplifier to be used for radiofrequency signal is carried out power amplification, be that radiofrequency signal is inputted by the radio frequency mouth of low noise amplifier, after amplifying, export from delivery outlet; The function class of power amplifier and LNA also is that radiofrequency signal is amplified seemingly, and namely radiofrequency signal, is repeated no more by delivery outlet output by the input of radio frequency mouth herein; And the frequency mixer in the various embodiments described above has the two-way input, one the tunnel is radiofrequency signal, another road is local oscillation signal, will export intermediate-freuqncy signal after radiofrequency signal and the local oscillation signal mixing, and the frequency of intermediate-freuqncy signal is determined by the difference on the frequency of radiofrequency signal and local oscillation signal usually.
In addition, because low noise amplifier is different for the gain amplifier of the radiofrequency signal of different frequency range with power amplifier, low-band gain is high, the high band gain is low, thereby in order to make big or small the approaching of last intermediate frequency output of a plurality of frequency ranges, a kind of frequency-sweeping apparatus that the embodiment of the invention 6 provides can also comprise attenuator, namely can select as required attenuator to the radiofrequency signal control that gains, thereby so that different frequency range is basically identical at last intermediate-freuqncy signal power; For example shown in Figure 7, also can comprise the first attenuator 226 and the second attenuator 227 for control that radiofrequency signal is gained in the first processing unit 220 in above-described embodiment 5; Wherein, described the first attenuator 226 is connected with AMP224c with LNA222a respectively, exports to described AMP224c after decaying for the radiofrequency signal after LNA222a is amplified, in order to carry out power amplification; Described the second attenuator 227 is connected with AMP224c with LNA222b respectively, exports to described AMP224c after decaying for the radiofrequency signal after LNA222b is amplified, in order to carry out power amplification.
As shown in Figure 8, in order further to improve the effect that radiofrequency signal is gained and controls, so that the last intermediate frequency output size of a plurality of frequency ranges is more approaching, the frequency-sweeping apparatus that the embodiment of the invention 7 provides can also comprise the 3rd attenuator 228 and radio-frequency (RF) switch 229, the signal input of described the 3rd attenuator 228 optionally links to each other with described the first attenuator 226 or the second attenuator 227 by described radio-frequency (RF) switch 229, its signal output links to each other with described AMP223c, be used for the signal after described the first attenuator 226 or 227 decay of the second attenuator is carried out secondary extinction, with the effect of further lifting gain control.
As shown in Figure 9, a kind of frequency-sweeping apparatus that the embodiment of the invention 8 provides is on above-described embodiment 5,6 and 7 basis, described the second processing unit 230 can also comprise: the 4th attenuator 236, described the 4th attenuator 236 is connected with AMP233 respectively at described LNA232, after being decayed, described LNA232 amplifying signal exports to described AMP233, gain amplifier when controlling each amplifier amplifying signal power with this, thus can be so that the size of the last intermediate frequency output of each frequency range be more approaching.
Particularly attention is, because low noise amplifier is different for the gain amplifier of the radiofrequency signal of different frequency range with power amplifier, namely low-band gain is high, and the high band gain is low; Thereby in the specific implementation, if amplifying the gain amplifier of 1880M-1920M frequency band signals and be 70dB, the gain amplifier that amplifies the 2010M-2025M frequency band signals is 66dB, when the gain amplifier that amplifies the 2300M-2400M frequency band signals is 60dB, it is the attenuator of 5dB that the first attenuator 226 in the frequency-sweeping apparatus in the above embodiment of the present invention can be selected attenuation, it is the attenuator of 1dB that the second attenuator 227 can be selected attenuation, it is the attenuator of 6dB that the 3rd attenuator 228 can be selected attenuation, and it is the attenuator of 1dB that the 4th attenuator 236 can be selected attenuation; Certainly, those skilled in the art should readily understand, can select according to actual conditions for specifically choosing of attenuator, and this paper repeats no more.
Can find out, adopt the frequency-sweeping apparatus of the embodiment of the invention, many active links are set with the different frequency range of correspondence in frequency-sweeping apparatus, when testing, frequency range according to need test signal place is communicated with different active links, utilize the repeatedly outer interference signal of the described frequency range of filtering of a plurality of filters, output after in conjunction with a plurality of amplifiers radiofrequency signal being amplified simultaneously, and will export intermediate-freuqncy signal after radiofrequency signal and the local oscillation signal mixing, process and then finish frequency sweep to finish follow-up signal, thereby make this frequency-sweeping apparatus can support a plurality of frequency ranges of TDD; And guarantee that by increasing attenuator the size of intermediate frequency output signal is close on this basis; Adopt this kind structure lower to the requirement on devices in installing, and then can greatly save cost.
Based on above-mentioned thought, the embodiment of the invention 9 has proposed again a kind of frequency sweeping method, and as shown in figure 10, the method comprises:
Step 901: many active links are set, every frequency range that active link is corresponding different;
Concrete, in implementation process, three frequency ranges for TDD can arrange three active links, i.e. three active links corresponding to frequency ranges difference of A (1880M-1920M), B (2010M-2025M) and C (2300M-2400M); Certainly, two active links also can be set, being about to A (1880M-1920M) frequency range and B (2010M-2025M) frequency range adopts existing mode jointly to be set to an active link, be in A (1880M-1920M) frequency range and the interior radiofrequency signal of B (2010M-2025M) frequency range in order to processing, and another link is set to active link corresponding to C (2300M-2400M) frequency range; It should be noted that, the different active link of mentioning in the present embodiment refers to wherein to be used for radiofrequency signal is carried out filtering or amplified when processing, the frequency range that it is corresponding or band are logical different, and the specific works process between different links is substantially similar on principle with the course of work of existing conventional frequency-sweeping apparatus, and this paper repeats no more.
Step 902: radiofrequency signal is outputed on the corresponding active link of this frequency range according to the residing frequency range of signal to be tested;
In the specific implementation, can adopt the mode of radio-frequency (RF) switch that radiofrequency signal is switched to different active links; For example, for three active links, if signal to be tested is in A (1880M-1920M) frequency range, then the active link that this radio-frequency (RF) switch is corresponding with described A (1880M-1920M) frequency range is connected, and described radiofrequency signal is exported to this active link; For two active links, if signal to be tested is in A (1880M-1920M) frequency range or B (2010M-2025M) frequency range, then this radio-frequency (RF) switch is connected with article one active link, described radiofrequency signal is exported to this active link; Described article one active link is corresponding A (1880M-1920M) frequency range or B (2010M-2025M) frequency range simultaneously, it both can process the signal that is in A (1880M-1920M) frequency range, also can process the signal that is in B (2010M-2025M) frequency range, concrete processing mode is similar with the working method of existing conventional frequency-sweeping apparatus, repeats no more herein; If signal to be tested is in C (2300M-2400M) frequency range, then the active link that this radio-frequency (RF) switch is corresponding with this frequency range is connected, and described radiofrequency signal is exported to this active link;
Step 903: according to frequency range corresponding to this active link the radiofrequency signal of input is carried out filtering, and after filtering, carry out successively low noise amplification, power amplification and secondary filtering, again itself and local oscillation signal are carried out mixing and export by intermediate frequency filtering.
Need to prove, when carrying out filtering, the band of the filter in every active link is logical all identical with frequency range corresponding to this active link, also is like this during power amplification, and concrete filtering and amplification process can adopt existing mode to carry out, and repeat no more herein.
It should be noted that, since carry out signal power when amplifying the gain amplifier for the radiofrequency signal of different frequency range different, low-band gain is high, the high band gain is low, thereby in order to make big or small the approaching of last intermediate frequency output of a plurality of frequency ranges, the control that can also gain to the radiofrequency signal after amplifying after low noise in above-mentioned steps 903 is amplified after finishing gain and controlling, is carried out power amplification to radiofrequency signal again; Concrete gain control can realize that the attenuator in its course of work such as the various embodiments described above repeats no more herein by increasing attenuator.
It will be understood by those skilled in the art that and to represent information, message and signal with many different techniques and in the technology any one.For example, the message of mentioning in the above-mentioned explanation, information can be expressed as voltage, electric current, electromagnetic wave, magnetic field or magnetic particle, light field or above combination in any.
The professional can also further should be able to recognize, unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or the combination of the two, for the interchangeability of hardware and software clearly is described, composition and the step of each example described in general manner according to function in the above description.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.The professional and technical personnel can specifically should be used for realizing described function with distinct methods to each, but this realization should not thought and exceeds scope of the present invention.
The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can directly use the software module of hardware, processor execution, and perhaps the combination of the two is implemented.Software module can place the storage medium of any other form known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or the technical field.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can in the situation that does not break away from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a frequency-sweeping apparatus is characterized in that, comprising: multidiameter option switch, the first processing unit, the second processing unit and intermediate frequency filtering unit; Wherein,
Described multidiameter option switch links to each other with the second processing unit with described the first processing unit respectively, is used for according to the residing frequency range of signal to be tested radiofrequency signal being exported to described the first processing unit or the second processing unit;
Described the first processing unit is used for the radiofrequency signal that is in the first frequency range that receives is carried out filtering, and will through the radiofrequency signal of filtering amplify with secondary filtering after, itself and local oscillation signal are carried out mixing, export to again described intermediate frequency filtering unit;
Described the second processing unit is used for the radiofrequency signal that is in the second frequency range that receives is carried out filtering, and will through the radiofrequency signal of filtering amplify with secondary filtering after, itself and local oscillation signal are carried out mixing, export to again described intermediate frequency filtering unit;
Described intermediate frequency filtering unit links to each other with the second processing unit with described the first processing unit respectively, is used for the signal after the mixing is carried out exporting behind the intermediate frequency filtering.
2. frequency-sweeping apparatus according to claim 1, it is characterized in that, when described the second frequency range was 2300～2400M frequency range, described the second processing unit comprised: the first band pass filter BPF, the low noise amplifier LNA, power amplifier AMP, the second band pass filter BPF and the frequency mixer that connect successively; Wherein, the band of described the first band pass filter and the second band pass filter is logical is 2300-2400M.
3. frequency-sweeping apparatus according to claim 2 is characterized in that, described the first processing unit comprises: the 3rd BPF, the LNA, AMP, the 4th BPF and the frequency mixer that connect successively; Wherein, the band of described the 3rd BPF and the 4th BPF is logical is 1880-2025M.
4. frequency-sweeping apparatus according to claim 2, it is characterized in that: described multidiameter option switch is three tunnel radio-frequency (RF) switch; Described the first processing unit comprises: the 5th BPF, the LNA, AMP, the 6th BPF and the frequency mixer that connect successively, and the 7th BPF, the LNA, AMP, the 8th BPF and the frequency mixer that connect successively; The active link that described the 5th BPF, LNA, AMP, the 6th BPF and frequency mixer consist of is relation in parallel with the active link that the 7th BPF, LNA, AMP, the 8th BPF and frequency mixer consist of, wherein, the band of described the 5th BPF and the 6th BPF is logical to be 1880～1920M, and the band of described the 7th BPF and the 8th BPF is logical to be 2010～2025M.
5. frequency-sweeping apparatus according to claim 2, it is characterized in that: described multidiameter option switch is three tunnel radio-frequency (RF) switch; Described the first processing unit comprises: the 5th BPF, the 5th LNA, AMP, the 4th BPF and the frequency mixer that connect successively, and seven BPF in parallel with the 5th BPF and the 5th LNA and the 7th LNA, described the 7th LNA that is connected with the 7th BPF is connected with described AMP simultaneously; Wherein, the band of described the 5th BPF is logical to be 1880～1920M, and the band of described the 7th BPF is logical to be 2010～2025M, and the band of described the 4th BPF is logical to be 1880～2025M.
6. frequency-sweeping apparatus according to claim 5 is characterized in that, described the first processing unit also comprises: for the first attenuator and second attenuator of control that radiofrequency signal is gained; Wherein, described the first attenuator is connected with AMP with the 5th LNA respectively, exports to described AMP after decaying for the radiofrequency signal after the 5th LNA is amplified; Described the second attenuator is connected with AMP with the 7th LNA respectively, exports to described AMP after decaying for the radiofrequency signal after the 7th LNA is amplified.
7. frequency-sweeping apparatus according to claim 6, it is characterized in that, described the first processing unit also comprises: the 3rd attenuator and the 3rd radio frequency switch, the signal input of described the 3rd attenuator optionally links to each other with described the first attenuator or the second attenuator by described the 3rd radio frequency switch, its signal output links to each other with described AMP, is used for the signal after described the first attenuator or the decay of the second attenuator is carried out secondary extinction.
8. according to claim 5 to the described frequency-sweeping apparatus of 7 any one, it is characterized in that, the second processing unit also comprises: the 4th attenuator, described the 4th attenuator respectively with described the second processing unit in LNA be connected with AMP, export to this AMP after being used for this LNA amplifying signal decayed.
9. a frequency sweeping method is characterized in that, comprising:
Many active links are set, every frequency range that active link is corresponding different;
According to measured signal frequency range of living in radiofrequency signal is outputed on the corresponding active link of this frequency range;
According to frequency range corresponding to this active link the radiofrequency signal of input is carried out filtering, and after filtering, carry out successively low noise amplification, power amplification and secondary filtering, again itself and local oscillation signal are carried out mixing and export by intermediate frequency filtering.
10. described frequency sweeping method according to claim 9 is characterized in that the method also comprises:
The control that gains of radiofrequency signal after low noise amplified is carried out power amplification to the radiofrequency signal of finishing after gain is controlled again.
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| CN101871970A (en) * | 2010-06-02 | 2010-10-27 | 中兴通讯股份有限公司 | Wireless terminal and signal scanning method thereof |
| CN102904589B (en) * | 2012-09-21 | 2014-11-19 | 北京北方烽火科技有限公司 | Radio frequency signal reception module and frequency sweeping device |
| CN106788792A (en) * | 2016-11-24 | 2017-05-31 | 中国电子科技集团公司第四十研究所 | A kind of wideband multi-channel Poewr control method for being applied to vector network analyzer |
| CN107769800B (en) * | 2017-09-14 | 2019-12-27 | 天津大学 | Multi-frequency point terahertz inter-satellite communication receiver |
| CN108548958A (en) * | 2018-03-30 | 2018-09-18 | 南京国睿安泰信科技股份有限公司 | A kind of rapid frequency-sweeping system and method for spectrum detector |
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