CN113131872A - Compensation circuit and communication circuit - Google Patents
Compensation circuit and communication circuit Download PDFInfo
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- CN113131872A CN113131872A CN201911422454.7A CN201911422454A CN113131872A CN 113131872 A CN113131872 A CN 113131872A CN 201911422454 A CN201911422454 A CN 201911422454A CN 113131872 A CN113131872 A CN 113131872A
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- compensation circuit
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- 238000004891 communication Methods 0.000 title claims description 12
- 230000003321 amplification Effects 0.000 abstract description 23
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 23
- 230000006866 deterioration Effects 0.000 abstract description 13
- 238000010586 diagram Methods 0.000 description 18
- 238000000034 method Methods 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
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Abstract
The application discloses compensation circuit includes: the power amplifier comprises a first bridge, a second bridge, a first power amplifier, a second power amplifier, a first filter and a second filter; the input end of the first bridge is used for receiving a target radio frequency signal, the output end of the first bridge is respectively connected with the input end of the first power amplifier and the input end of the second power amplifier, the output end of the first power amplifier is connected with the input end of the first filter, the output end of the second power amplifier is connected with the input end of the second filter, and the output end of the first filter and the output end of the second filter are both connected with the input end of the second bridge. Obviously, the compensation circuit can achieve the purpose of performing gain compensation on the radio frequency amplification circuit and avoid return loss deterioration caused by gain compensation by only respectively arranging the power amplifier and the filter on two circuit branches of the balanced power amplification circuit. This significantly reduces the structural complexity of the gain compensation circuit of the rf amplifier circuit.
Description
Technical Field
The present invention relates to the field of communication transmission technologies, and in particular, to a compensation circuit and a communication circuit.
Background
In modern communication transmission systems, the rf amplifying circuit is already an indispensable part of the whole transmission link, but the gain-frequency curve of the rf amplifying circuit is usually not a horizontal straight line, which seriously affects the stability of the rf amplifying circuit during operation. In the conventional technology, gain compensation is usually performed on the radio frequency amplification circuit by using a filter, but the deterioration of return loss in the radio frequency amplification circuit is caused while gain compensation is performed on the radio frequency amplification circuit by using the filter. In this case, it is necessary to add a corresponding circuit module to the post-stage of the filter to optimize the return loss of the whole rf amplifying circuit, which results in a complicated and lengthy structure of the gain compensation circuit of the rf amplifying circuit. At present, no effective solution exists for the problem.
Therefore, it is obvious that how to perform gain compensation on the rf amplifier circuit and reduce the structural complexity of the gain compensation circuit of the rf amplifier circuit at the same time is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a compensation circuit and a communication circuit, which can perform gain compensation on an rf amplifier circuit and reduce the complexity of the structure of the gain compensation circuit of the rf amplifier circuit. The specific scheme is as follows:
a compensation circuit, comprising: the power amplifier comprises a first bridge, a second bridge, a first power amplifier, a second power amplifier, a first filter and a second filter;
the input end of the first bridge is used for receiving a target radio frequency signal, the output end of the first bridge is respectively connected with the input end of the first power amplifier and the input end of the second power amplifier, the output end of the first power amplifier is connected with the input end of the first filter, the output end of the second power amplifier is connected with the input end of the second filter, and the output end of the first filter and the output end of the second filter are both connected with the input end of the second bridge.
Preferably, the first power amplifier and/or the second power amplifier is/are specifically bcl016b.s2p.
Preferably, the first filter and/or the second filter is/are specifically LC filters.
Preferably, the first bridge and the second bridge have the same structural form.
Preferably, the first bridge and the second bridge are four-port devices.
Correspondingly, the invention also discloses a communication circuit comprising the compensation circuit disclosed in the foregoing.
The compensation circuit provided by the invention is substantially equivalent to a balanced power amplifier circuit, wherein the first power amplifier and the second power amplifier form two paths of parallel radio frequency amplification circuits, the first filter and the second filter can perform gain compensation on the two paths of parallel radio frequency amplification circuits, and the first power amplifier, the second power amplifier, the first filter and the second filter are respectively positioned on two branch circuits of the balanced power amplifier circuit, so that the echo loss deteriorations caused by the first filter and the second filter can be mutually offset, and the echo loss deteriorations caused by the gain compensation can be avoided. Compared with the prior art, in the compensation circuit provided by the invention, the purpose of performing gain compensation on the radio frequency amplification circuit can be achieved only by arranging the two power amplifiers and the two filters on the two circuit branches of the balanced power amplification circuit respectively through the two bridges, and the deterioration of return loss caused by the gain compensation can be avoided. Obviously, the arrangement mode can obviously reduce the structural complexity of the gain compensation circuit of the radio frequency amplification circuit. Correspondingly, the communication circuit provided by the invention also has the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a structural diagram of a compensation circuit according to an embodiment of the present invention;
FIG. 2 is a block diagram of an RF amplifier according to an embodiment of the present invention;
FIG. 3 is a return loss plot of a radio frequency amplifier;
FIG. 4 is a graph of gain curves for a radio frequency amplifier;
FIG. 5 is a block diagram of a filter provided in an embodiment of the invention;
FIG. 6 is a graph of the return loss of a filter;
FIG. 7 is a graph of the gain of a filter;
FIG. 8 illustrates a compensation circuit of a prior art RF amplifier circuit;
FIG. 9 is a return loss plot of a compensation circuit of a prior art RF amplification circuit;
FIG. 10 is a graph of gain curves of a compensation circuit of a prior art RF amplifier circuit;
fig. 11 is a structural diagram of a compensation circuit of a radio frequency amplifier according to an embodiment of the present invention;
fig. 12 is a return loss curve diagram of a compensation circuit of an rf amplifier according to an embodiment of the present invention;
fig. 13 is a gain curve diagram of a compensation circuit of an rf amplifier according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a structural diagram of a compensation circuit according to an embodiment of the present invention, the compensation circuit includes: a first bridge 11, a second bridge 12, a first power amplifier 13, a second power amplifier 14, a first filter 15 and a second filter 16;
the input end of the first bridge 11 is configured to receive a target radio frequency signal, the output end of the first bridge 11 is connected to the input end of a first power amplifier 13 and the input end of a second power amplifier 14, respectively, the output end of the first power amplifier 13 is connected to the input end of a first filter 15, the output end of the second power amplifier 14 is connected to the input end of a second filter 16, and the output ends of the first filter 15 and the second filter 16 are both connected to the input end of the second bridge 12.
In this embodiment, a novel compensation circuit is provided, by which not only the gain compensation of the rf amplifier circuit can be performed, but also the structural complexity of the gain compensation circuit of the rf amplifier circuit can be reduced.
The compensation circuit provided in this embodiment is composed of two bridges, two power amplifiers, and two filters, and the specific connection structure thereof can be seen in fig. 1. As can be seen from the circuit connection structure shown in fig. 1, the compensation circuit provided in this embodiment is substantially equivalent to a balanced power amplifier circuit, in which the first power amplifier 13 and the second power amplifier 14 can perform power amplification on the target rf signal input to the first bridge 11, and perform gain compensation on the target rf signal after power amplification through the first filter 15 and the second filter 16, respectively.
Since the first filter 15 and the second filter 16 are added after the first power amplifier 13 and the second power amplifier 14, respectively, the return loss is deteriorated in the compensation circuit, in the present embodiment, the first power amplifier 13, the second power amplifier 14, the first filter 15, and the second filter 16 are respectively provided in the two branch circuits of the balanced power amplifier circuit, so that the return loss deterioration caused by the first filter 15 and the second filter 16 can be cancelled out, and thus the return loss deterioration caused by the gain compensation process performed by the first filter 15 and the second filter 16 can be avoided.
Obviously, compared to the prior art that the return loss of the whole rf amplifying circuit is optimized by adding a corresponding circuit module to the rear end of the filter, in the compensating circuit provided in this embodiment, only two power amplifiers and two filters are respectively disposed on two branches of the balanced power amplifier circuit by using two bridges, so that the return loss deteriorations caused by the first filter 15 and the second filter 16 can be cancelled out. Thus, not only the purpose of gain compensation of the radio frequency amplification circuit is achieved, but also the deterioration of return loss caused by gain compensation can be avoided. Obviously, the arrangement mode can obviously reduce the structural complexity of the gain compensation circuit of the radio frequency amplification circuit.
The compensation circuit provided by this embodiment is substantially equivalent to a balanced power amplifier circuit, wherein the first power amplifier and the second power amplifier constitute two parallel rf amplification circuits, and the first filter and the second filter can perform gain compensation on the two parallel rf amplification circuits, and because the first power amplifier, the second power amplifier, the first filter, and the second filter are respectively located on two branch circuits of the balanced power amplifier circuit, echo loss deteriorations caused by the first filter and the second filter can be cancelled out, so that echo loss deteriorations caused by the gain compensation can be avoided. Compared with the prior art, in the compensation circuit provided in this embodiment, the two power amplifiers and the two filters are respectively disposed on the two circuit branches of the balanced power amplifier circuit through the two bridges, so that the purpose of performing gain compensation on the radio frequency amplifier circuit can be achieved, and the deterioration of the return loss caused by the gain compensation can also be avoided. Obviously, the arrangement mode can obviously reduce the structural complexity of the gain compensation circuit of the radio frequency amplification circuit.
Based on the above embodiments, this embodiment further describes and optimizes the technical solution, and as a preferred implementation, the first power amplifier 13 and/or the second power amplifier 14 are/is specifically bcl016b.s2p.
It can be understood that the bcl016b.s2p has not only the advantage of a wide power output range but also the advantage of low power consumption, so that when the first power amplifier 13 and/or the second power amplifier 14 is set to bcl016b.s2p, the overall power consumption of the gain compensation circuit of the radio frequency amplification circuit can be relatively reduced.
In addition, because BCL016B.S2P is common in actual life, when the BCL016B.S2P is used for building the gain compensation circuit of the radio-frequency amplification circuit, the difficulty in building the gain compensation circuit of the radio-frequency amplification circuit in the building process can be relatively reduced.
Based on the above embodiments, this embodiment further describes and optimizes the technical solution, and as a preferred implementation, the first filter 15 and/or the second filter 16 are specifically LC filters.
In practical application, the first filter 15 and/or the second filter 16 may be set as an LC filter, because the LC filter has a simpler circuit structure, and no power supply needs to be additionally provided during use, so that not only the use of the LC filter is more convenient, but also the working performance of the LC filter is more stable and reliable, thereby further improving the reliability and safety of the gain compensation circuit of the radio frequency amplification circuit during use.
Based on the above embodiments, the present embodiment further describes and optimizes the technical solution, and as a preferred embodiment, the first bridge 11 and the second bridge 12 have the same structural form.
In the actual operation process, the first bridge 11 and the second bridge 12 may be configured as bridges with the same structural form, because when the first bridge 11 and the second bridge 12 are configured as bridges with the same structural form, not only the structural form of the entire balanced power amplifier circuit may be more orderly and symmetrical, but also the overall reliability of the balanced power amplifier circuit in the operation process may be further improved.
Specifically, the first bridge 11 and the second bridge 12 are specifically four-port devices.
In this embodiment, the first bridge 11 and/or the second bridge 12 are/is configured as a four-port device, because the four-port device is common in real life and the cost of the four-port device is relatively low, when the first bridge 11 and/or the second bridge 12 are/is configured as a four-port device, the design cost required by the gain compensation circuit of the rf amplifier circuit can be relatively reduced.
Based on the technical content disclosed in the above embodiments, the present embodiment proves the technical effect that the present invention can achieve through a specific rf amplifier. Referring to fig. 2, fig. 3 and fig. 4, fig. 2 is a structural diagram of a radio frequency amplifier according to an embodiment of the present invention, fig. 3 is a return loss curve diagram of the radio frequency amplifier, and fig. 4 is a gain curve diagram of the radio frequency amplifier. As can be seen from fig. 4, the fluctuation of the rf amplifier in the pass band is 4 dB. Now to optimize this fluctuation, a filter can be added at the later stage of the rf amplifier to compensate for the gain of the rf amplifier. Referring to fig. 5, fig. 6 and fig. 7, fig. 5 is a structural diagram of a filter according to an embodiment of the present invention, fig. 6 is a return loss curve diagram of the filter, and fig. 7 is a gain curve diagram of the filter. In fig. 7, the two return loss curves are coincident with each other, and as can be seen from fig. 6, the insertion loss parameter of the filter can compensate the fluctuation parameter of the rf amplifier, but the return loss of the rf amplifier may be deteriorated.
Referring to fig. 8, fig. 8 shows a compensation circuit of a prior art rf amplifier circuit, i.e., an rf amplifier and a filter are connected in series. Referring to fig. 9 and 10, fig. 9 is a return loss curve diagram of a compensating circuit of a prior art rf amplifying circuit, and fig. 10 is a gain curve diagram of the compensating circuit of the prior art rf amplifying circuit. As can be seen from fig. 9, the in-band ripple of the gain compensation circuit is 2dB, which is optimized by 2dB over the previous one. However, as can be seen from fig. 10, the return loss of the gain compensation circuit is relatively poor.
Referring to fig. 11, 12 and 13, fig. 11 is a structural diagram of a compensation circuit of a radio frequency amplifier according to an embodiment of the present invention, wherein N1 is a first bridge, N2 is a second bridge, P1 is a first amplifier, P2 is a second amplifier, M1 is a first filter, and M2 is a second filter; fig. 12 is a return loss curve diagram of a compensation circuit of a radio frequency amplifier according to an embodiment of the present invention, and fig. 13 is a gain curve diagram of the compensation circuit of the radio frequency amplifier according to the embodiment of the present invention. As can be seen from fig. 12, the return loss parameter of the gain compensation circuit is still 2dB, which has the effect of optimizing the in-band ripple, and as can be seen from fig. 13, the return loss of the gain compensation circuit reaches 18dB, that is, the return loss has a great optimization effect. Obviously, the compensation circuit provided by the embodiment of the invention not only can achieve the purpose of gain compensation of the radio frequency amplifier, but also can avoid the deterioration of return loss caused by the gain compensation. Obviously, the arrangement mode can obviously reduce the structural complexity of the gain compensation circuit of the radio frequency amplification circuit.
Correspondingly, the invention also discloses a communication circuit comprising the compensation circuit disclosed in the foregoing.
The communication circuit disclosed by the embodiment of the invention has the beneficial effects of the compensation circuit disclosed by the embodiment of the invention.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The compensation circuit and the communication circuit provided by the present invention are described in detail above, and the principle and the implementation of the present invention are explained in this document by applying specific examples, and the above description of the embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (6)
1. A compensation circuit, comprising: the power amplifier comprises a first bridge, a second bridge, a first power amplifier, a second power amplifier, a first filter and a second filter;
the input end of the first bridge is used for receiving a target radio frequency signal, the output end of the first bridge is respectively connected with the input end of the first power amplifier and the input end of the second power amplifier, the output end of the first power amplifier is connected with the input end of the first filter, the output end of the second power amplifier is connected with the input end of the second filter, and the output end of the first filter and the output end of the second filter are both connected with the input end of the second bridge.
2. The compensation circuit of claim 1, wherein the first power amplifier and/or the second power amplifier is in particular a BCL016B.S2P.
3. Compensation circuit according to claim 1, characterized in that the first filter and/or the second filter are in particular LC filters.
4. The compensation circuit of any one of claims 1 to 3, wherein the first bridge and the second bridge are identical in configuration.
5. The compensation circuit of claim 4, wherein the first bridge and the second bridge are embodied as four-port devices.
6. A communication circuit comprising a compensation circuit as claimed in any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911422454.7A CN113131872A (en) | 2019-12-31 | 2019-12-31 | Compensation circuit and communication circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911422454.7A CN113131872A (en) | 2019-12-31 | 2019-12-31 | Compensation circuit and communication circuit |
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| Publication Number | Publication Date |
|---|---|
| CN113131872A true CN113131872A (en) | 2021-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911422454.7A Pending CN113131872A (en) | 2019-12-31 | 2019-12-31 | Compensation circuit and communication circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117875272A (en) * | 2024-03-12 | 2024-04-12 | 成都华兴汇明科技有限公司 | P2D model conversion S2D model and method for obtaining S2D model |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101567667A (en) * | 2009-04-24 | 2009-10-28 | 福建三元达通讯股份有限公司 | Enhancement type analog predistortion linear power amplifier |
| US9859844B1 (en) * | 2016-10-10 | 2018-01-02 | Sebastien Amiot | Power amplifier circuit and method of design |
| US20180097480A1 (en) * | 2016-10-05 | 2018-04-05 | Futurewei Technologies, Inc. | Radio frequency apparatus and method with dual variable impedance components |
| JP2018133698A (en) * | 2017-02-15 | 2018-08-23 | 日本無線株式会社 | Power amplifier |
| CN109863694A (en) * | 2016-08-30 | 2019-06-07 | 天工方案公司 | The low-noise amplifier of gain stage with phase programmable |
| CN109962686A (en) * | 2019-02-27 | 2019-07-02 | 宁波大学 | A kind of double mode radio-frequency power amplification system |
-
2019
- 2019-12-31 CN CN201911422454.7A patent/CN113131872A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101567667A (en) * | 2009-04-24 | 2009-10-28 | 福建三元达通讯股份有限公司 | Enhancement type analog predistortion linear power amplifier |
| CN109863694A (en) * | 2016-08-30 | 2019-06-07 | 天工方案公司 | The low-noise amplifier of gain stage with phase programmable |
| US20180097480A1 (en) * | 2016-10-05 | 2018-04-05 | Futurewei Technologies, Inc. | Radio frequency apparatus and method with dual variable impedance components |
| US9859844B1 (en) * | 2016-10-10 | 2018-01-02 | Sebastien Amiot | Power amplifier circuit and method of design |
| JP2018133698A (en) * | 2017-02-15 | 2018-08-23 | 日本無線株式会社 | Power amplifier |
| CN109962686A (en) * | 2019-02-27 | 2019-07-02 | 宁波大学 | A kind of double mode radio-frequency power amplification system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117875272A (en) * | 2024-03-12 | 2024-04-12 | 成都华兴汇明科技有限公司 | P2D model conversion S2D model and method for obtaining S2D model |
| CN117875272B (en) * | 2024-03-12 | 2024-05-14 | 成都华兴汇明科技有限公司 | Method for converting P2D model into S2D model |
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Application publication date: 20210716 |
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