CN206533356U - A kind of receiver suppressed with high mirror image - Google Patents
A kind of receiver suppressed with high mirror image Download PDFInfo
- Publication number
- CN206533356U CN206533356U CN201720155458.3U CN201720155458U CN206533356U CN 206533356 U CN206533356 U CN 206533356U CN 201720155458 U CN201720155458 U CN 201720155458U CN 206533356 U CN206533356 U CN 206533356U
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- China
- Prior art keywords
- phase shifter
- switch
- attenuator
- balun
- amplifier
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Abstract
A kind of receiver suppressed with high mirror image, including quadrature demodulator, the first balun, the second balun, first switch, second switch, amplifier, attenuator, the first phase shifter, the second phase shifter and dB electric bridges, the I roads output end of quadrature demodulator is sequentially connected the first balun, first switch, amplifier and the first phase shifter, the Q roads output end of quadrature demodulator is sequentially connected the second balun, second switch, the second phase shifter and attenuator, and the output end of the first phase shifter and attenuator is connected into two inputs of dB electric bridges respectively.During the utility model in quadrature demodulator by exporting I, Q two-way, amplifier, adjustable attenuator and phase shifter are introduced respectively, regulation and control reach the amplitude and phase of the two paths of signals at 3dB electric bridges, so that image frequency signal offsets suppression in 3dB bridge outputs 180 ° of reverse equivalences of formation in two-way, high image rejection function is realized.
Description
Technical field
The utility model is related to receiver image rejection techniques field, more particularly to a kind of reception suppressed with high mirror image
Machine.
Background technology
Image interference has to a kind of parasitic path interference phenomenon considered when being receiver design.Image frequency enters frequency mixer
After local oscillator mixing, the frequency of output also falls on intermediate frequency, is difficult to be filtered out, so as to reduce the signal to noise ratio of intermediate frequency output, is formed
Interference to useful signal.
In recent years, it is to eliminate image interference, have devised by by the zero intermediate frequency reciver of carrier wave Direct Conversion to base band.
Under ideal conditions, i.e., two-way orthogonal local oscillation signal frequency is identical, phase differs 90 °；Frequency mixer, LPF, amplifier, ADC are to letter
Number response it is completely the same；I, Q two paths of signals transmission environment phase are meanwhile, it is capable to be completely eliminated image disturbing signal.But in reality
In hardware circuit, physical limit, circuit design, error of PCB layouts of device etc. can cause the phase of I roads and Q roads signal
Error and gain imbalance, and then image disturbing signal is produced, and cause the base band demodulating bit error rate to raise.
Utility model content
The utility model provides a kind of receiver suppressed with high mirror image, not enough to solve above-mentioned prior art.Pass through
In quadrature demodulator output I, Q two-way, amplifier, adjustable attenuator and phase shifter are introduced respectively, and regulation and control are reached at 3dB electric bridges
Two paths of signals amplitude and phase so that in two-way image frequency signal 3dB bridge outputs formation 180 ° of reverse equivalences offset
Suppress, realize high image rejection function.
In order to realize the purpose of this utility model, intend using following technology：
A kind of receiver suppressed with high mirror image, it is characterised in that including quadrature demodulator, the first balun, the second bar
Human relations, first switch, second switch, amplifier, attenuator, the first phase shifter, the second phase shifter and dB electric bridges, the quadrature demodulation
The I roads output end of device is sequentially connected first balun, the first switch, the amplifier and first phase shifter, institute
The Q roads output end for stating quadrature demodulator is sequentially connected second balun, the second switch, second phase shifter and described
Attenuator, the output end of first phase shifter and the attenuator is connected into two inputs of the dB electric bridges respectively.
Further, the amplifier uses variable gain amplifier.
Further, the attenuator uses adjustable attenuator.
Further, the first switch and the second switch use single-pole double throw mechanical switch.
The beneficial effects of the utility model are：
1st, the utility model reaches 3dB quadrature bridges by introducing amplifier and attenuator, regulation in I, Q two paths of signals
Two paths of signals in image signal amplitude it is identical.
2nd, the utility model adjusts by the phase shifter combinations introduced in I, Q two paths of signals and reaches 3dB quadrature bridges
The phase of image signal in two paths of signals keeps 90 ° or so differences.
3rd, the utility model I roads have natural mirror image inhibitory action, and two-way image frequency signal is formed in 3dB bridge outputs
180 ° of reverse equivalences offset effect, secondary image inhibitory action are formed, so as to realize the high inhibition to image interference.
Brief description of the drawings
Fig. 1 shows the utility model structural representation.
Embodiment
As shown in figure 1, a kind of receiver suppressed with high mirror image, including quadrature demodulator 1, the first balun 21, second
Balun 22, first switch 31, second switch 32, amplifier 4, attenuator 5, the first phase shifter 61, the second phase shifter 62 and 3dB electricity
Bridge 7.The quadrature demodulator 1 is used to produce I roads and Q roads two paths of signals.First balun 21 and second balun 22 are used
In matching connection.The first switch 31 and the second switch 32 use single-pole double throw mechanical switch, logical for selection signal
Road, coordinates frequency spectrograph to measure the Magnitude Difference for the intermediate-freuqncy signal output amplitude for comparing image frequency signal amplitude and output end, so that
Instruct regulation is described can amplifier 4 and the attenuator 5.First phase shifter 61 and second phase shifter 62 are used to distinguish
First balun 21 and the output end of the second balun 22 are calibrated to the phase of the 3dB electric bridges 7 so that I, Q two paths of signals
Phase difference in the range of intermediate-frequency bandwidth is less than 5 degree.Image frequency signal in I, Q two paths of signals passes through constant amplitude after the 3dB electric bridges 7
Reverse cancellation.
The I roads output end of the quadrature demodulator 1 is sequentially connected first balun 21, the first switch 31, described
Amplifier 4 and first phase shifter 61.The Q roads output end of the quadrature demodulator 1 is sequentially connected second balun 22, institute
State second switch 32, second phase shifter 62 and the attenuator 5.First phase shifter 61 and the attenuator 5 it is defeated
Go out two inputs that end is connected into the 3dB electric bridges 7 respectively.In the presence of image frequency signal, the circuit knot after I roads output end 11
Structure has natural mirror image inhibitory action.
Illustrate that the utility model embodiment is as follows in conjunction with the embodiments：
As described in Figure 1, after radiofrequency signal RF is entered by the input of the quadrature demodulator 1, it is divided into I roads and Q roads two
Road orthogonal signalling.
I roads signal is balanced by I roads output end 11 into first balun 21.First mechanical switch
31 connect interface 311 to connect the amplifier 4, signal is passed sequentially through after the amplifier 4 and first phase shifter 61,
Into the input port 71 of the 3dB electric bridges 7.
Q roads signal is balanced by Q roads output end 12 into second balun 22.Second mechanical switch
32 connect interface 321 to connect second phase shifter 62, signal is passed sequentially through second phase shifter 62 and attenuator 5
Afterwards, into the input 72 of the 3dB electric bridges 7.
I roads signal and Q roads signal are orthogonal in the 3dB electric bridges 7, by the output signal of output port 73.
The implementation method that high mirror image suppresses：
The intermediate-freuqncy signal output amplitude of output port 73 is measured using frequency spectrograph.
Adjust first mechanical switch 31 and connect interface 312, connect the interface 312 using frequency spectrograph and map out I roads
Middle image frequency signal amplitude.
Adjust second mechanical switch 32 and connect interface 322, connect the interface 322 using frequency spectrograph and map out Q roads
Middle image frequency signal amplitude.
According to the above results, the amplifier 4 and the attenuator 5 are adjusted so that the pad value of the attenuator 5 is added
The yield value of the amplifier 4 is equal to intermediate-freuqncy signal and image frequency signal Magnitude Difference.During regulation, observation is connected to described defeated
Frequency spectrograph intermediate frequency output reading at exit port 73, appropriate selection adjusts the attenuator 5, pressed down with obtaining optimal image signal
System.
Claims (4)
1. a kind of receiver suppressed with high mirror image, it is characterised in that including quadrature demodulator (1), the first balun (21), the
Two baluns (22), first switch (31), second switch (32), amplifier (4), attenuator (5), the first phase shifter (61), second
Phase shifter (62) and 3dB electric bridges (7), the I roads output end of the quadrature demodulator (1) be sequentially connected first balun (21),
The first switch (31), the amplifier (4) and first phase shifter (61), the Q roads output of the quadrature demodulator (1)
End is sequentially connected second balun (22), the second switch (32), second phase shifter (62) and the attenuator
(5), the output end of first phase shifter (61) and the attenuator (5) is connected into two inputs of the 3dB electric bridges (7) respectively
End.
2. a kind of receiver suppressed with high mirror image according to claim 1, it is characterised in that the amplifier (4)
Using variable gain amplifier.
3. a kind of receiver suppressed with high mirror image according to claim 1, it is characterised in that the attenuator (5)
Using adjustable attenuator.
4. a kind of receiver suppressed with high mirror image according to claim 1, it is characterised in that the first switch
(31) and the second switch (32) use single-pole double throw mechanical switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720155458.3U CN206533356U (en) | 2017-02-21 | 2017-02-21 | A kind of receiver suppressed with high mirror image |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720155458.3U CN206533356U (en) | 2017-02-21 | 2017-02-21 | A kind of receiver suppressed with high mirror image |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206533356U true CN206533356U (en) | 2017-09-29 |
Family
ID=59919365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720155458.3U Expired - Fee Related CN206533356U (en) | 2017-02-21 | 2017-02-21 | A kind of receiver suppressed with high mirror image |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206533356U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106788501A (en) * | 2017-02-21 | 2017-05-31 | 成都沃邦德科技有限公司 | A kind of receiver suppressed with mirror image high |
-
2017
- 2017-02-21 CN CN201720155458.3U patent/CN206533356U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106788501A (en) * | 2017-02-21 | 2017-05-31 | 成都沃邦德科技有限公司 | A kind of receiver suppressed with mirror image high |
| CN106788501B (en) * | 2017-02-21 | 2022-06-21 | 成都沃邦德科技有限公司 | Receiver with high image rejection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170929 Termination date: 20210221 |