CN214959453U - A Continuous Class J Power Amplifier Circuit Based on Four-frequency Point Matching - Google Patents
A Continuous Class J Power Amplifier Circuit Based on Four-frequency Point Matching Download PDFInfo
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Abstract
本实用新型提供一种基于四频点匹配的连续J类功率放大电路，包括输入匹配电路、连续J类功率放大器和输出匹配电路，相较于传统的J类以及连续J类功率放大器，只针对单个频点进行二次谐波和基波阻抗的匹配，在保证较高效率的前提下，对功放带宽的提升是很有限的。本设计提出了一款四频点匹配的连续J类功率放大电路，通过采用简洁的电路拓扑在功放输出端即可实现对设计频带内四个基波频点以及对应二次谐波阻抗的控制。输出匹配网络包括第一传输线TLC1、第二传输线TLC2、第三传输线TLC3、第四传输线TLC4、第五传输线TLC5、第六传输线TLC6、第七传输线TLF1和第八传输线TLF2。相对于现有技术，本实用新型在连续J类模式功率放大器的基础上，通过采用简易的谐波和基波控制网络，在功放的输出端利用多频点匹配方法对设计频带内的四个基波和对应的二次谐波阻抗进行控制，最终使得功放输出端的电流波形更加接近为半正弦波，电压波形更加接近为方波，从而在连续J类功放理论的基础上实现功率放大器效率和带宽的进一步提升。
The utility model provides a continuous J-type power amplifier circuit based on four-frequency point matching, which includes an input matching circuit, a continuous J-type power amplifier and an output matching circuit. Compared with the traditional J-type and continuous J-type power amplifiers, only a single The frequency point is matched with the second harmonic and the fundamental wave impedance. Under the premise of ensuring high efficiency, the improvement of the power amplifier bandwidth is very limited. This design proposes a four-frequency matching continuous class J power amplifier circuit, which can control the four fundamental frequency points and the corresponding second harmonic impedance in the designed frequency band at the output end of the power amplifier by using a simple circuit topology. The output matching network includes a first transmission line TL C1 , a second transmission line TL C2 , a third transmission line TL C3 , a fourth transmission line TL C4 , a fifth transmission line TL C5 , a sixth transmission line TL C6 , a seventh transmission line TL F1 and an eighth transmission line TL F2 . Compared with the prior art, on the basis of the continuous J-mode power amplifier, the utility model adopts a simple harmonic and fundamental wave control network, and uses the multi-frequency point matching method at the output end of the power amplifier to match the four frequency points within the designed frequency band. The fundamental wave and the corresponding second harmonic impedance are controlled, so that the current waveform at the output end of the power amplifier is closer to a half-sine wave, and the voltage waveform is closer to a square wave, so that the power amplifier efficiency and further increase in bandwidth.
Description
Technical Field
The utility model relates to a radio frequency communication technical field especially relates to a continuous J type power amplifier circuit based on four frequency point match.
Background
In recent years, wireless communication technology has been greatly developed, and modulation schemes have become more and more complex. The power amplifier, as the last module in the transmitter, is the most power consuming component in the whole radio frequency system, and its main function is to amplify the power of the signal output by the previous stage, and then send the amplified signal to the antenna for transmission. Due to the change of the current transmission mechanism and the increase of the transmission bandwidth, the fact that the power amplifier can have a sufficiently wide bandwidth and a sufficiently high efficiency becomes a technical index which is mainly pursued at present, which is mainly reflected in the following aspects: (1) the bandwidth of the power amplifier. For 4G communications, which are currently in use, three operators of mobile, telecommunications and telecommunications, span the frequency band in the range of 1.7-2.7GHz and the 5G communications band being put into use, and three operators span the range of 3.3-4.8 GHz. Therefore, from the current trend of mobile communication, the requirement of the power amplifier for the operating bandwidth is becoming more and more strict. (2) Efficiency of the power amplifier. Since the power amplifier is the last stage of the whole rf transmitting unit and consumes the most energy, the efficiency of the power amplifier is required to be as high as possible. Since modern communication systems mainly use modulated signals as transmission means and the transmission signals span a wide frequency band, the power amplifier is required to not only maintain high efficiency but also have a large bandwidth. In order to improve the efficiency and the operating bandwidth of the power amplifier, various technologies are available, such as a continuous class F theory, a continuous class J theory, and the like.
With the rapid innovation of mobile communication technology, although the continuous J-class theory greatly expands the performance index of a broadband high-efficiency power amplifier, on the premise of ensuring a large bandwidth, the improvement of efficiency is always limited, and the fundamental reason is that the design of a matching circuit in such a wide frequency band range is always designed only for a single frequency point no matter harmonic control or fundamental wave matching. Therefore, how to improve the efficiency to the maximum extent while ensuring a large bandwidth is a difficult problem to be solved urgently.
Therefore, in view of the above-mentioned drawbacks of the prior art, it is necessary to provide a solution to further increase the operating bandwidth and efficiency of the power amplifier.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a continuous J class power amplifier circuit based on four frequency point matches, through on continuous J class mode power amplifier's theoretical basis, adopt simple and easy harmonic and fundamental wave control network, utilize the multiple frequency point matching method to control four fundamental waves in the design frequency band and the second harmonic impedance that corresponds at the output of power amplifier, finally make the current waveform of power amplifier output more be close to half sine wave, the voltage waveform is close to the square wave more, thereby on continuous J class theoretical basis of power amplifier, further improve power amplifier's work efficiency and bandwidth.
In order to overcome the defects of the prior art, the utility model adopts the following technical scheme:
a continuous J-type power amplification circuit based on four-frequency point matching comprises an input matching circuit, a continuous J-type power amplifier and an output matching circuit;
the continuous J-type power amplifying circuit comprises an input matching circuit, a continuous J-type power amplifier and an output matching circuit which are sequentially connected in series, and the output matching circuit is connected with a load;
the output matching circuit comprises a first transmission line TLc1A second transmission line TLc2A third transmission line TLC3A fourth transmission line TLC4A fifth transmission line TLC5A sixth transmission line TLC6A seventh transmission line TLF1An eighth transmission line TLF2Wherein the second transmission line TLc2A third transmission line TLC3A sixth transmission line TLC6Lambda/4 under second harmonic conditions, fifth transmission line TLC5Length of lambda/2 under second harmonic condition, the first transmission line TLc1Is connected to the output of the continuous class J power amplifier, the first transmission line TLc1And the other end of the second transmission line TLc2Of the third transmission line TLC3And the fourth transmission line TLC4Is connected to one end of the second transmission line TLc2Open at the other end of the third transmission line TLc3Open circuit at the other end; the fourth transmission line TLc4And the other end of the fifth transmission line TLc5Of the sixth transmission line TLC6And the seventh transmission line TLF1Is connected to one end of the fifth transmission line TLc5Is short-circuited at the other end of the sixth transmission line TLc6Open circuit at the other end; the seventh transmission line TLF1And the other end of the eighth transmission line TLF2Is connected to a load having an impedance of 50 ohms; the eighth transmission line TLF2And the other end of the same is open-circuited.
Preferably, an input matching network is arranged between the continuous J-type power amplifier and an input signal source.
Preferably, the continuous class-J power amplifier is implemented by using transistors.
Preferably, the first transmission line TLC1A second transmission line TLC2Z of (A)C2A third transmission line TLC3Z of (A)C3A fourth transmission line TLC4A fifth transmission line TLC5Z of (A)C5A sixth transmission line TLC6Z of (A)C6A seventh transmission line TLF1And an eighth transmission line TLF2Is adjusted in accordance with the actual input signal parameters.
Preferably, the load impedance is 50 ohms.
Compared with the prior art, the utility model provides a continuous J class power amplifier circuit based on four frequency point matches, on continuous J class mode power amplifier's theoretical basis, adopt simple and easy harmonic and fundamental wave control network, utilize the multiple frequency point matching method to control four fundamental waves in the design frequency band and the second harmonic impedance that corresponds at the output of power amplifier, finally make the current waveform of power amplifier output be close more for half sine wave, the voltage waveform is close more to the square wave, thereby realize the further promotion of power amplifier efficiency and bandwidth on continuous J class power amplifier theoretical basis.
Drawings
Fig. 1 is a block diagram of the continuous J-class power amplifier circuit based on four-frequency point matching.
Fig. 2 is a schematic structural diagram of the output matching network of the present invention.
Fig. 3 is the utility model discloses continuous J type power amplifier circuit's simulation effect picture based on four frequency point match.
Detailed Description
The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
The applicant carries out deep research on the structure of the continuous J-type power amplifier in the prior art aiming at the defects in the prior art, and although the continuous J-type power amplifier theory in the prior art can expand the bandwidth of the power amplifier to a great extent, higher efficiency is kept at the same time. However, when the operating frequency band of the power amplifier is expanded to multiple frequency multiplication, the efficiency of the power amplifier is difficult to be ensured, and the problem of low efficiency exists. The reason is mainly because the impedance matching is usually performed on a single frequency point in the traditional design method no matter in the harmonic matching or the fundamental wave matching, so that the bandwidth expansion is extremely limited while the efficiency is ensured. Therefore, the applicant proposes to combine the continuous J-class power amplifier and the multi-frequency point matching method. In the actual circuit design, how to realize the multi-frequency point control by using a simple topological structure is also a difficult problem, and if the frequency point control is less, the bandwidth expansion is limited; if the frequency points are controlled too much, the circuit topology is too complex and large, and the energy consumption is increased. Therefore, through repeated verification and test, the applicant can well expand the bandwidth of the power amplifier when the proposed simple topological structure is used for controlling four frequency points in a design frequency band, and meanwhile, higher efficiency can be guaranteed.
Referring to fig. 1, the overall structure block diagram of the continuous J-class power amplifier circuit based on four-frequency point matching of the present invention is shown, and is similar to the structure of the existing continuous J-class power amplifier, including an input matching circuit, a continuous J-class power amplifier, and an output matching circuit; the input matching circuit is used for completing matching of the input ports and transmitting input signals to the continuous J-type power amplifier, and the continuous J-type power amplifier transmits output signals to the output matching circuit and then transmits the output signals to the load.
Continuous class J power amplifiers are the focus of research, and it is found that, when the second harmonic impedance is extended from a short circuit point to a pure reactance containing a pure imaginary part by analyzing the harmonic impedance based on the class J amplifier, the bandwidth can be extended while ensuring high efficiency. However, in the design of the multiple frequency circuit, the continuous J-class theory is difficult to meet the requirements of practical application. Therefore, under the prerequisite of guaranteeing higher efficiency, in order to the work bandwidth of expansion power amplifier that can be further, the utility model provides a continuous J class power amplifier circuit's output matching circuit based on four frequency point matches. Referring to FIG. 2, the output of the present invention is shownThe structure block diagram of the matching circuit, the output matching circuit further comprises a first transmission line TLc1A second transmission line TLc2A third transmission line TLC3A fourth transmission line TLC4A fifth transmission line TLC5A sixth transmission line TLC6A seventh transmission line TLF1An eighth transmission line TLF2Wherein the second transmission line TLc2A third transmission line TLC3A sixth transmission line TLC6Lambda/4 under second harmonic conditions, fifth transmission line TLC5Length of lambda/2 under second harmonic condition, the first transmission line TLc1Is connected to the output of the continuous class J power amplifier, the first transmission line TLc1And the other end of the second transmission line TLc2Of the third transmission line TLC3And the fourth transmission line TLC4Is connected to one end of the second transmission line TLc2Open at the other end of the third transmission line TLc3Open circuit at the other end; the fourth transmission line TLc4And the other end of the fifth transmission line TLc5Of the sixth transmission line TLC6And the seventh transmission line TLF1Is connected to one end of the fifth transmission line TLc5Is short-circuited at the other end of the sixth transmission line TLc6Open circuit at the other end; the other end of the seventh transmission line TLF1 is connected to one end of the eighth transmission line TLF2 and a load having an impedance of 50 ohms; the eighth transmission line TLF2And the other end of the same is open-circuited.
The principle of the output matching circuit is that the fundamental wave of a designed frequency point and the optimal impedance range of the corresponding second harmonic are obtained based on a load traction technology. Meanwhile, in order to better complete bandwidth expansion and efficiency improvement of the power amplifier, fundamental waves and harmonic waves need to meet the requirements of high efficiency and wide bandwidth. Thus, the output matching network is particularly divided into a harmonic control network and a fundamental control network. Firstly, as for the harmonic control network, the continuous J-type mode can ensure higher efficiency and can expand the second harmonic impedance to pure reactance. To achieve good second harmonic in a wider frequency bandWave and fundamental wave impedance matching design is combined with a multi-frequency point matching theory, four fundamental waves and corresponding second harmonic frequency points are selected at equal intervals in a working frequency band, and the four selected fundamental wave frequency points are assumed to be f1、f2、f3And f4Then the corresponding second harmonic is 2f1、2f2、2f3And 2f4. At this time, TL is transformed by quarter-wave impedance transformation principleC2The open-ended microstrip line pair 2f1With an electrical length of lambda/4, then for 2f1In other words, the impedance Zh1The effect similar to short circuit can be kept in the frequency range taking the selected second harmonic frequency point as the center; in a similar manner, TLC3The open-ended microstrip line pair 2f2With an electrical length of lambda/4, then for 2f2In other words, the impedance Zh1The effect similar to a short circuit can be maintained also in a certain frequency range. At the same time, in combination with microstrip line TLC1Impedance Zh1Are each at 2f1And 2f2And the two frequency points are matched to be within the optimal second harmonic impedance range obtained by the load traction technology. At the same time, TLC5This pair of short-circuited microstrip lines at the end 2f3The electrical length of which is lambda/2, i.e. the impedance Z is obtained by two impedance transformations of lambda/4h3The effect similar to short circuit can be kept in the frequency range taking the frequency point as the center; TLC6The open-ended microstrip line pair 2f4And the electrical length is lambda/4, and the short circuit effect at the frequency point can be realized. Also in combination with a microstrip line TLC4Impedance Zh3Are each at 2f3And 2f4And the two frequency points are matched to be within the optimal second harmonic impedance range obtained by the load traction technology. Therefore, the harmonic control network can simultaneously complete the optimal impedance matching of four secondary harmonic frequency points in a wide frequency band range, and realize the purpose of waveform shaping, so that the current waveform output by the power amplifier tube is approximate to a half sine wave, and the voltage waveform is approximate to a square wave, thereby improving the working efficiency of the power amplifier in a larger bandwidth range; for a fundamental wave matching network, by a microstrip line impedance transformation formula, the method canDetermination of the impedance ZLAnd ZfTaking into account the relationship between two microstrip lines TL connected in series between two impedance valuesF1、TLF2. Therefore, the finally obtained expression necessarily includes all unknown parameters of the two microstrip lines, namely ZF1、θF1、ZF2、θF2. Combining the theory of multi-frequency point matching, the four fundamental frequency points correspond to four equations. Therefore, four parameters of the fundamental wave matching network can be uniquely determined through the four equations, and the multi-frequency point matching of the fundamental wave impedance can be completed. And by combining the action of the harmonic control network, the bandwidth of the power amplifier can be greatly expanded while the high efficiency is ensured.
Wherein the first transmission line TLC1A second transmission line TLC2Z of (A)C2A third transmission line TLC3Z of (A)C3A fourth transmission line TLC4A fifth transmission line TLC5Z of (A)C5A sixth transmission line TLC6Z of (A)C6A seventh transmission line TLF1And an eighth transmission line TLF2Is adjusted in accordance with the actual input signal parameters.
In a preferred embodiment, an input matching circuit is provided between the continuous class J power amplifier and the input signal source.
In a preferred embodiment, an output matching circuit is provided between the continuous class J power amplifier and the load.
In a preferred embodiment, the continuous class J power amplifier is implemented using transistors.
In a preferred embodiment, the load impedance is 50 ohms.
The utility model provides a continuous J class power amplifier accessible design realization as follows based on four frequency point matches:
the method comprises the following steps: designing an output matching circuit based on four-frequency point matching;
the method comprises the following steps: designing an input matching circuit with a traditional structure;
step two: the integral circuit debugging is carried out by combining the continuous J-type power amplifier;
the load impedance of the continuous class J power amplifier described above is 50 ohms.
Referring to fig. 3, it is shown that the utility model discloses continuous J class power amplifier circuit's simulation effect picture based on four frequency points match can be seen from fig. 3, for current continuous J class power amplifier circuit, the utility model discloses continuous J class power amplifier circuit's based on four frequency points match bandwidth is guaranteeing higher work efficiency's within range and is showing the improvement.
The above description of the embodiments is only intended to help understand the method of the present invention and its core ideas. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120819578.5U CN214959453U (en) | 2021-04-19 | 2021-04-19 | A Continuous Class J Power Amplifier Circuit Based on Four-frequency Point Matching |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120819578.5U CN214959453U (en) | 2021-04-19 | 2021-04-19 | A Continuous Class J Power Amplifier Circuit Based on Four-frequency Point Matching |
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| CN202120819578.5U Expired - Fee Related CN214959453U (en) | 2021-04-19 | 2021-04-19 | A Continuous Class J Power Amplifier Circuit Based on Four-frequency Point Matching |
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