CN102111114A - Design method for reverse class-F power amplifier based on 3/4 spiral virtual ground structure - Google Patents
Design method for reverse class-F power amplifier based on 3/4 spiral virtual ground structure Download PDFInfo
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Abstract
A design method for a reverse class-F power amplifier based on 3/4 spiral virtual ground structure comprises the steps as follows: confirming the work frequency of the power amplifier and obtaining the harmonic frequency of a harmonic control circuit; changing the dimension of the 3/4 spiral structure and designing corresponding harmonic control circuit according to the needed harmonic frequency in the design; inserting the harmonic control circuit into the output end of a power amplifier tube and designing the input-output matching circuit of a power amplifier circuit; and designing the input-output parameters of the power amplifier through measurement, and adjusting the length of a magic line to reach the maximum work efficiency. The amplifier designed by adopting the method comprises an input matching circuit, a power amplifier circuit, a harmonic control circuit and an output matching circuit which are connected onto a microstrip line in sequence; the harmonic control circuit comprises a 3/4 spiral virtual ground structure arranged below the microstrip line, and the virtual ground structure is formed by a complete spiral virtual ground structure cut by 1/4; and the 3/4 spiral virtual ground structure comprises two spiral structure parts connected with each other and in axial symmetry along the microstrip line.
Description
Technical field
The present invention is a kind of method that is used to design contrary F power-like amplifier, particularly a kind of design of the contrary F power-like amplifier of high efficiency based on 3/4 spiral virtual address structure (3/4Spiral Defected Ground Structure).
Background technology
The develop rapidly of wireless communication technique is had higher requirement to the performance index of communication system, power amplifier is as important component part in the wireless telecommunications emission system, also be to realize the difficulty maximum, the part that price is the most expensive, the quality of its performance all has a significant impact for indexs such as the outer spectrum of the message transmission rate of system, coverage, the availability of frequency spectrum and band are spuious.
Along with application (WCDMA, WLAN, WiMAX etc.) based on modern wireless communication networks, the wireless data transmission of two-forty has improved the peak-to-average force ratio of signal, this just requires power amplifier must return back to linear zone to reach the purpose that improves the linearity, but the rollback of power output point means the reduction of power amplifier operating efficiency, so the operating efficiency that improves power amplifier has very important meaning for the development of following wireless telecommunications.
High-efficiency amplifier has become the emphasis in the radio-frequency (RF) communication system research field gradually, and the researcher has proposed a lot of new technology and structure to improve power amplification efficiency, for example Doherty amplifier, E class, F class, S power-like amplifier etc.Contrary F power-like amplifier is a kind of high-efficiency amplifier based on the harmonic wave control circuit, by of even-order harmonic open circuit, the odd harmonic short circuit of harmonic wave control circuit with power amplifier output, change the waveform of drain voltage and electric current, can reach 100% drain efficiency in theory.It is little that the high-efficiency amplifier of the other types of comparing, contrary F class A amplifier A have a volume, and the efficient height is used advantages such as bandwidth.
Summary of the invention
Technical problem: the object of the present invention is to provide a kind of efficient method for designing against the F power-like amplifier based on 3/4 spiral virtual address structure.The filtering characteristic design harmonic wave control circuit of the uniqueness that 3/4 spiral virtual address structure microstrip line has is inserted in the method utilization, this harmonic wave control circuit has solved the shortcoming of the low operating frequency of traditional lamped element harmonic wave control circuit low reactance-resistance ratio, and avoided the shortcoming that traditional little band harmonic wave control circuit area is big, design is complicated, the contrary F power-like amplifier that goes out with this harmonic wave Circuit Design has that area is little, high efficiency, cost is low and advantage such as simplicity of design.
Technical scheme: the present invention is based on the contrary F power-like amplifier of 3/4 spiral virtual address structure design, technical scheme mainly is divided into following step:
1) determines the working frequency points of power amplifier, obtain the harmonic wave frequency of harmonic wave control circuit thus.
2) according to the harmonic wave frequency of needs in the design, change the size of 3/4 helical structure, design corresponding harmonic wave control circuit.
3), design the input and output matching circuit of power amplifier then with the output of harmonic wave control circuit insertion power tube.
4) measure the power amplifier of designing, adjust the length of resonance line, to reach maximum efficiency.
The described a kind of 3/4 spiral virtual address structure of step (b) is that traditional spiral virtual address structure is cut 1/4, so not only can reduce its area, and its resonance frequency of adjusting that can be convenient.
The described harmonic wave control circuit of step (b) utilizes the frequency response characteristic of inserting 3/4 spiral virtual address structure microstrip line, shortens the size of microstrip line under the same electrical length, simplifies the structure of harmonic wave control circuit, reduces the insertion loss of circuit.
Described harmonic wave control circuit, below power amplifier, add the heat dissipation metal base, in order not influence the frequency characteristic of virtual address structure, the design determines to reach the size of metallic plate upper plenum and neither influence the purpose that harmonic wave control circuit performance does not influence the power amplifier heat radiation yet by Electromagnetic Simulation.
The described design power amplifier of step (c) input matching circuit inserts 1/8 wavelength stub between the grid of power tube and input matching circuit, with the second harmonic short circuit, eliminate the influence that the input signal distortion produces power amplifier properties.
Step (d) is described to be made in the maximized process of power amplification efficiency, adds resonance line in the harmonic wave control circuit, by changing its length, eliminates power tube source-drain electrode parasitic capacitance to harmonic wave control circuit Effect on Performance, improves the efficient of power amplifier.
A kind of contrary F power-like amplifier based on 3/4 spiral virtual address structure of design according to the method described above is included in the input matching circuit, power amplifier, harmonic wave control circuit and the output matching circuit that connect in turn on the microstrip line.Described harmonic wave control circuit comprises the 3/4 spiral virtual address structure that is located at described microstrip line below, and this virtual address structure cuts 1/4 by the complete helix virtual address structure and constitutes; Described 3/4 spiral virtual address structure comprises along two parts helical structure of described microstrip line axial symmetry and connection,
Wherein a part of helical structure is, ground wire is divided into eight sections of a～h of connecting according to this, and they are all parallel with described microstrip line, and establishing the ground live width is x; In a side of a section, b, c, f and g section from inside to outside according to this be arranged in parallel; At the opposite side of a section, d, e and h section from inside to outside according to this be arranged in parallel; The interval of each section is greater than x; Be connected with the axisymmetric correspondent section of h section by in h section and another part helical structure.
In the described helical structure, the connecting line of each section ground wire is vertical with described microstrip line.
On the described microstrip line, at the power amplifier front end and be connected with 1/8 wavelength stub.
Described harmonic wave control circuit comprises the resonance line that is located on the described microstrip line, and this resonance line is located at the front end of described 3/4 spiral virtual address structure.
Described microwave circuit is laid on the microwave sheet material; Described power amplifier has the heat dissipation metal base; On the heat dissipation metal base, be provided with cavity with described 3/4 spiral virtual address structure corresponding position.
Beneficial effect:
1) in the contrary F power-like amplifier of the present invention, uses 3/4 spiral virtual address structure design harmonic wave control circuit.Traditional spiral virtual address structure has two kinds on symmetrical spiral and asymmetric spiral.Symmetry helical structure area is big, and asymmetric helical structure design is complicated, and these two kinds of structures all are difficult to adjust respectively two resonance frequencies.Compare traditional structure, the area of 3/4 spiral virtual address structure is littler, and two resonant frequency points can be adjusted respectively, and design is simplified more, have saved the plate-making cost.
2) the harmonic wave control circuit that is applied in usually in the contrary F power-like amplifier is divided into two kinds: lamped element control circuit and microstrip line construction control circuit.The harmonic wave control circuit of lamped element design is subjected to the restriction of operating frequency and element Q value, can't provide good filtering performance at high frequency treatment.The control circuit area of microstrip line construction is big and design is complicated, has influenced the application of power amplifier in communication system.The 3/4 spiral virtual address structure that adopts among the present invention has the operating frequency height, the advantage that power loss is little and area is little in conjunction with the harmonic wave control circuit of microstrip line design.
3) in the contrary harmonic wave control circuit of F power-like amplifier of tradition, 2 subharmonic can only be opened a way, harmonic wave control circuit among the present invention utilizes the filtering characteristic of 3/4 helical structure, under the prerequisite that does not increase design complexities and power loss,, well improved the operating efficiency and the power output of power amplifier with 2 times, 4 subharmonic open circuit.
4) in the power amplifier of the present invention, added 1/8th wavelength stubs,, eliminated the influence that the input signal distortion produces power amplifier properties the second harmonic short circuit at the input of power tube.Compare traditional contrary F power-like amplifier, the contrary F power-like amplifier among the present invention has higher operating efficiency.
5) the present invention has added resonance line in the harmonic wave control circuit of power tube, in order to eliminate power tube source-drain electrode parasitic capacitance to harmonic wave control circuit Effect on Performance, effectively raises the operating efficiency of power amplifier.
Description of drawings
Fig. 1 is 3/4 spiral virtual address structure schematic diagram
Fig. 2 is the schematic diagram of the 3/4 helical structure microstrip line of this example, and the size with helical structure among the figure marks with letter; 1 is 3/4 spiral virtual address structure, the 2nd, and microstrip line.
Fig. 3 is the emulation actual measurement comparison diagram of the frequency response characteristic of 3/4 helical structure microstrip line.
Fig. 4 is the schematic block diagram of the 3/4 spiral virtual address structure harmonic wave control circuit that designs among the present invention.
Fig. 5 is the frequency response and the input impedance of 3/4 spiral virtual address structure harmonic wave control circuit.
Fig. 6 is the test input and output figure as a result of the contrary F power-like amplifier in the example.
Fig. 7 is the measured power added efficiency figure as a result of the contrary F power-like amplifier in the example
Embodiment
Below in conjunction with description of drawings, the solution of the present invention is elaborated, concrete steps are as follows:
With reference to figure 1,3, a kind of contrary F power-like amplifier based on 3/4 spiral virtual address structure is included in the input matching circuit, power amplifier, harmonic wave control circuit and the output matching circuit that connect in turn on the microstrip line.Described harmonic wave control circuit comprises the 3/4 spiral virtual address structure that is located at described microstrip line below, and this virtual address structure cuts 1/4 by the complete helix virtual address structure and constitutes; Described 3/4 spiral virtual address structure comprises along two parts helical structure of described microstrip line axial symmetry and connection,
Wherein a part of helical structure is, ground wire is divided into eight sections of a～h of connecting according to this, and they are all parallel with described microstrip line, and establishing the ground live width is x; In a side of a section, b, c, f and g section from inside to outside according to this be arranged in parallel; At the opposite side of a section, d, e and h section from inside to outside according to this be arranged in parallel; The interval of each section is greater than x; Be connected with the axisymmetric correspondent section of h section by in h section and another part helical structure.
In the described helical structure, the connecting line of each section ground wire is vertical with described microstrip line.
On the described microstrip line, at the power amplifier front end and be connected with 1/8 wavelength stub.
Described harmonic wave control circuit comprises the resonance line that is located on the described microstrip line, and this resonance line is located at the front end of described 3/4 spiral virtual address structure.
Described microwave circuit is laid on the microwave sheet material; Described power amplifier has the heat dissipation metal base; On the heat dissipation metal base, be provided with cavity with described 3/4 spiral virtual address structure corresponding position.
With reference to figure 2～7:
1. this example is example with design work at the contrary F power-like amplifier of 2.4GHz.It is 2.65 that PCB selects dielectric constant for use, and thickness is the microwave sheet material of 1mm, and power tube is selected the Hetero-structure field effect transistor for use.Because operating frequency is 2.4GHz, then 2,3,4 subfrequencies are respectively 4.8GHz, 7.2GHz and 9.6GHz.Determine the size of 3/4 helical structure by the ANS0FTHFSS simulation software.The 3/4 spiral virtual address structure of this example as shown in Figure 2, its final size is: A=2.6mm, B=1.4mm, C=1.2mm, D=1mm, E=0.2mm, F=0.6mm, G=3.2mm, H=2.6mm.
2. because the design power amplifier will be considered heat dissipation problem, so in actual applications, can below power amplifier, add the heat dissipation metal base.Exert an influence for fear of the filtering characteristic of metab, must on the metab of its position, dig out a cavity virtual address structure.Determine the size of cavity to make metab can not influence virtual address structure by ANSOFT HFSS simulation software, simultaneously can be too not big because of cavity yet, the influence heat radiation.Final cavity size is 1.5cm*2cm.
3. processing has the microstrip line pcb board of 3/4 spiral virtual address structure, and its filtering characteristic of actual measurement is adjusted the helical structure size according to measurement result, makes it at the harmonic wave frequency best harmonic wave control effect be arranged as far as possible.Figure 3 shows that final emulation and test result, as we can see from the figure, emulation and test result are identical substantially, and have good filtering characteristic at the harmonic wave frequency.
4. use the 3/4 spiral virtual address structure design harmonic wave control circuit of determining size, its structured flowchart as shown in Figure 4.Fig. 5 is time the frequency response characteristic of control circuit, and the input impedance of coming out according to this property calculation, and as can be seen, the harmonic wave control circuit is well with 2 times, 4 subharmonic open circuit, with 3 subharmonic short circuits from the result.
5. the harmonic wave control circuit is added the output of power tube, design its input and output matching circuit then.
6. the designed contrary F power-like amplifier that goes out of plate-making processing is measured its operating efficiency, and adjustment resonance line length makes the operating efficiency maximum of power amplifier.
Fig. 6 and Fig. 7 are the The performance test results of power amplifier.As we can see from the figure, at the saturated output point of power amplifier, its power added efficiency can reach 76%.
Claims (10)
1. method for designing based on the contrary F power-like amplifier of 3/4 spiral virtual address structure is characterized in that step comprises:
A) determine the working frequency points of this power amplifier, obtain the harmonic wave frequency of harmonic wave control circuit thus;
B) according to the harmonic wave frequency of needs in the design, change the size of 3/4 helical structure, design corresponding harmonic wave control circuit;
C) the harmonic wave control circuit is inserted the power tube circuit output end, design the input and output matching circuit of power amplifier then;
D) measure the input of the power amplifier design, adjust the length of resonance line, to reach maximum efficiency.
2. according to the described method for designing of claim 1, it is characterized in that in the step (b) that described 3/4 spiral virtual address structure is traditional spiral virtual address structure to be cut 1/4 obtain based on the contrary F power-like amplifier of 3/4 spiral virtual address structure.
3. according to the described method for designing of claim 1 based on the contrary F power-like amplifier of 3/4 spiral virtual address structure, it is characterized in that in the step (b), described harmonic wave control circuit adds the heat dissipation metal base below power amplifier, and determines the size of metallic plate upper plenum by Electromagnetic Simulation.
4. according to the described method for designing of claim 1, it is characterized in that in the described step (c), between the grid of power tube and input matching circuit, insert 1/8 wavelength stub, the second harmonic short circuit based on the contrary F power-like amplifier of 3/4 spiral virtual address structure.
5. described based on the method for designing of 3/4 spiral virtual address structure against the F power-like amplifier according to claim 1,
It is characterized in that in the harmonic wave control circuit, adding resonance line in the described step (d),, eliminate power tube source-drain electrode parasitic capacitance, improve the efficient of power amplifier harmonic wave control circuit Effect on Performance by changing its length.
6. contrary F power-like amplifier according to the design of the arbitrary method of claim 1～5 based on 3/4 spiral virtual address structure, be included in the input matching circuit, power amplifier, harmonic wave control circuit and the output matching circuit that connect in turn on the microstrip line, it is characterized in that described harmonic wave control circuit comprises the 3/4 spiral virtual address structure that is located at described microstrip line below, this virtual address structure cuts 1/4 by the complete helix virtual address structure and constitutes; Described 3/4 spiral virtual address structure comprises along two parts helical structure of described microstrip line axial symmetry and connection,
Wherein a part of helical structure is, ground wire is divided into eight sections of a～h of connecting according to this, and they are all parallel with described microstrip line, and establishing the ground live width is x; In a side of a section, b, c, f and g section from inside to outside according to this be arranged in parallel; At the opposite side of a section, d, e and h section from inside to outside according to this be arranged in parallel; The interval of each section is greater than x; Be connected with the axisymmetric correspondent section of h section by in h section and another part helical structure.
7. according to the described contrary F power-like amplifier of claim 6, it is characterized in that in the described helical structure, the connecting line of each section ground wire is vertical with described microstrip line based on 3/4 spiral virtual address structure.
8. according to the described contrary F power-like amplifier of claim 6, it is characterized in that on the described microstrip line, at the power amplifier front end and be connected with 1/8 wavelength stub based on 3/4 spiral virtual address structure.
9. according to the described contrary F power-like amplifier based on 3/4 spiral virtual address structure of claim 6, it is characterized in that described harmonic wave control circuit comprises the resonance line that is located on the described microstrip line, this resonance line is located at the front end of described 3/4 spiral virtual address structure.
10. according to the described contrary F power-like amplifier of claim 6, it is characterized in that described microwave circuit is laid on the microwave sheet material based on 3/4 spiral virtual address structure; Described power amplifier has the heat dissipation metal base; On the heat dissipation metal base, be provided with cavity with described 3/4 spiral virtual address structure corresponding position.
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| CN110635698A (en) * | 2019-05-28 | 2019-12-31 | 电子科技大学 | Radio frequency signal rectifier with high backspacing range |
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| WO2019079999A1 (en) * | 2017-10-25 | 2019-05-02 | Telefonaktiebolaget Lm Ericsson (Publ) | Harmonic control circuit and apparatus as well as method for manufacturing harmonic control apparatus |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103391057A (en) * | 2012-05-11 | 2013-11-13 | 京信通信***（中国）有限公司 | Reverse F-type power amplifier and emitter as well as processing method |
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| CN110635698B (en) * | 2019-05-28 | 2021-04-30 | 电子科技大学 | Radio frequency signal rectifier with high backspacing range |
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