CN205545164U - Power amplifier self -adaptation linearized system - Google Patents
Power amplifier self -adaptation linearized system Download PDFInfo
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- CN205545164U CN205545164U CN201620079689.6U CN201620079689U CN205545164U CN 205545164 U CN205545164 U CN 205545164U CN 201620079689 U CN201620079689 U CN 201620079689U CN 205545164 U CN205545164 U CN 205545164U
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Abstract
The utility model provides a power amplifier self -adaptation linearized system relates to radiofrequency signal amplifier linearisation technique, including input coupler, predistortion chip, correction coupler, power amplifier and back coupling ware, radiofrequency signal warp the input coupler divide into main signal and sampled signal, main signal input corrects the coupler, sampled signal by the predistortion chip is handled the back production and is corrected radiofrequency signal in advance, exports to correct the coupler, with the way is closed to the main signal, closes the radiofrequency signal warp behind the way power amplifier exports to the back coupling ware, radiofrequency signal after enlargeing by the back coupling ware falls into output signal and feedback signal, output signal exports other radio frequency system to, the feedback signal feedback extremely the predistortion chip. The utility model discloses a power amplifier self -adaptation linearized system can effectively improve the linearity of power amplifier, and the energy consumption is lower, practices thrift cost, simply easy -to -use.
Description
Technical field
The utility model relates to radiofrequency signal amplifying technique, especially a kind of power amplifier adaptive linear system.
Background technology
Traditional Digital Signal Processing uses the method for digital pre-distortion, its principle is: come by a predistortion element and power amplifier element cascades, non-linear distortion function is built in numeral, digital base band signal process territory, and its distortion quantity shown with amplifier is suitable, but function is contrary.The two non-linear distortion function is combined, is just capable of highly linear, undistorted system.But, the broadband pre-correction signal of digital pre-distortion system output is propagated by whole transmitting chain, and turns again to digital baseband by feedback path.So, bandwidth expansion will increase clock frequency, enlarged elements bandwidth requirement, and cause higher system power dissipation, thus increase the weight of the burden of whole system；The complexity increased includes extremely challenging clock generator requirement, add the demand to multipole high frequency reconstruction wave filter, and need wide-band linearity frequency up-converters, and the rejection ability of the wave filter after upconverter is required height, then wave filter is while realizing height suppression, insertion loss can increase, and has influence on the efficiency of system further.
In sum, digital pre-distortion system is high to the requirement of system element, and overall power is high, and cost is high, and the complexity realized is high.
Utility model content
For solving above-mentioned technical problem, the utility model proposes a kind of power amplifier adaptive linear system, can effectively promote the linear of power amplifier, and all of cellular band can be covered and support various modulation standard.
The utility model specifically adopts the following technical scheme that realization:
Power amplifier adaptive linear system, including input coupler, predistortion chip, correct coupler, power amplifier and back coupler, radiofrequency signal is divided into main signal and sampled signal through described input coupler, coupler is corrected in the input of described main signal, described sampled signal compares generation precorrection radiofrequency signal with feedback signal after being processed by described predistortion chip, output is to described correction coupler, road is closed with described main signal, close the radiofrequency signal behind road through the output of described power amplifier to described back coupler, radiofrequency signal after amplification is divided into output signal and feedback signal by described back coupler, described output signal exports to other radio systems, described feedback signal back is to described predistortion chip.
As preferably, being provided with input signal difference matching module between described input coupler and described predistortion chip, described input signal difference matching module includes the first balun and input impedance matching circuit.
As preferably, being provided with predistortion correction signal difference matching module between described correction coupler and described predistortion chip, described predistortion correction signal difference matching module includes the second balun and output impedance matching circuit.
As preferably, being provided with power feedback signal difference matching module between described back coupler and described predistortion chip, described power feedback signal difference matching module includes the 3rd balun and feedback impedance match circuit.
As preferably, also include that power subsystem, described power subsystem are connected with described predistortion chip.
As preferably, between described input coupler and described correction coupler, it is additionally provided with delayer.
As preferably, described predistortion chip exterior is also associated with clock circuit and crystal oscillator.
The power amplifier adaptive linear system that the utility model provides, it has the beneficial effects that, radiofrequency signal is before being exaggerated, utilize predistortion chip that radiofrequency signal is carried out pre-distortion, radiofrequency signal after processing again is overlapped with main signal, after superposition, radiofrequency signal carries out power amplification, simultaneously, radio frequency output signal after amplifying is sampled, the output signal of sampling feeds back to predistortion chip again, correct in time when radio frequency signal predistortion is processed, the radiofrequency signal needed for final output.Therefore, the utility model can be effectively improved the linear of power amplifier, and energy consumption is relatively low, cost-effective, easy to use.
Accompanying drawing explanation
Fig. 1 is the system block diagram of the utility model power amplifier adaptive linear system；
Fig. 2 is the circuit theory diagrams of input signal difference matching module；
Fig. 3 is the circuit theory diagrams of predistortion correction signal difference matching module；
Fig. 4 is the circuit theory diagrams of power feedback signal difference matching module；
Fig. 5 is the peripheral circuit schematic diagram of predistortion chip；
Fig. 6 is the circuit theory diagrams of power subsystem.
Detailed description of the invention
For further illustrating each embodiment, the utility model is provided with accompanying drawing.These accompanying drawings are a part for the utility model disclosure, and it is mainly in order to illustrate embodiment, and the associated description of specification can be coordinated to explain the operation principles of embodiment.Coordinating with reference to these contents, those of ordinary skill in the art will be understood that other possible embodiments and advantage of the present utility model.Assembly in figure is not necessarily to scale, and similar element numbers is conventionally used to indicate similar assembly.
In conjunction with the drawings and specific embodiments, the utility model is further illustrated.
As shown in Figure 1, the power amplifier adaptive linear system that the present embodiment provides, radiofrequency signal is divided into main signal and sampled signal through input coupler, main signal directly inputs correction coupler, sampled signal inputs the first balun, and (balun refers to balanced-unbalanced transformer, lower same), carry out impedance transformation, input to predistortion chip after input impedance matching circuit (as shown in Figure 2).Sampled signal through pre-distortion, export to exporting impedance matching circuit (as shown in Figure 3) and carry out impedance matching, it is then input to the second balun, carries out the pre-distorted signals after impedance transformation and input to correcting coupler, carry out with main signal and superposition couples.Radiofrequency signal through predistortion is amplified by power amplifier, to meet the demanded power output of device.It is divided into output signal and feedback signal by back coupler after amplification, output signal is exported by antenna after synthesizer, wave filter and duplexer process, feedback signal back carries out impedance transformation to the 3rd balun, then export to feedback impedance match circuit (as shown in Figure 4) and carry out impedance matching, feedback signal recently enters to predistortion chip, in order to correct timely when processing radio frequency signal predistortion.
Changing inductance in Fig. 2, Fig. 3 and Fig. 4, electric capacity and the model of balun, the present embodiment can be applicable to different working frequency range, is broken generally into following four frequency ranges: 225～520MHz, 520～1040MHz, 1800～2200MHz, 2300～2800MHz, 3300-3800MHz.If microwave frequency band or the application of FM frequency range, can add corresponding frequency changer circuit, make the present embodiment use as IF process module on the basis of the present embodiment, predistortion function also can be properly functioning.
The present embodiment is applied when low-power (< 5～10W) Linear Power Amplifier, need not add outside delayer, use the performance that direct-passing mode can be obtained by；When applying when memory effect is than more serious power amplifier, the outside delayer of preferably time delay about 6ns；When applying at major part Doherty power amplifier and High Linear power amplifier, preferably time delay is about the outside delayer of about 4ns.
As it is shown in figure 5, the predistortion chip of the present embodiment uses the SC1894 chip that Maxim Integrated company provides, in conjunction with external clock and crystal oscillator, crystal oscillator frequency is at 20MHZ.Also can use SC1887 or SC1889 or SC1869 chip, also can produce a desired effect.
As shown in Figure 6,1.8V and the 3.3V DC voltage needed for the power subsystem of the present embodiment provides for predistortion chip.
Although specifically showing in conjunction with preferred embodiment and describing the utility model; but those skilled in the art should be understood that; in the spirit and scope of the present utility model limited without departing from appended claims; the utility model can be made a variety of changes in the form and details, be protection domain of the present utility model.
Claims (7)
1. a power amplifier adaptive linear system, it is characterised in that include input coupler, lose in advance
True chip, correction coupler, power amplifier and back coupler, radiofrequency signal is through described input coupler
Being divided into main signal and sampled signal, the input of described main signal to correct coupler, described sampled signal is by described pre-
Distortion chip compares generation precorrection radiofrequency signal with feedback signal after processing, and output corrects coupling to described
Device, closes road with described main signal, closes the radiofrequency signal behind road through the output of described power amplifier to described feedback
Coupler, the radiofrequency signal after amplification is divided into output signal and feedback signal by described back coupler, described
Output signal output is to other radio systems, described feedback signal back to described predistortion chip.
Power amplifier adaptive linear system the most according to claim 1, it is characterised in that: described
Input signal difference matching module, described input signal it is provided with between input coupler and described predistortion chip
Difference matching module includes the first balun and input impedance matching circuit.
Power amplifier adaptive linear system the most according to claim 1, it is characterised in that: described
Correct and be provided with predistortion correction signal difference matching module between coupler and described predistortion chip, described pre-
Distortion correction signal differential matching module includes the second balun and output impedance matching circuit.
Power amplifier adaptive linear system the most according to claim 1, it is characterised in that: described
Power feedback signal difference matching module, described power it is provided with between back coupler and described predistortion chip
Feedback signal difference matching module includes the 3rd balun and feedback impedance match circuit.
Power amplifier adaptive linear system the most according to claim 1, also includes power subsystem,
Described power subsystem is connected with described predistortion chip.
Power amplifier adaptive linear system the most according to claim 1, described input coupler and
It is additionally provided with delayer between described correction coupler.
Power amplifier adaptive linear system the most according to claim 1, described predistortion chip
Outside is also associated with clock circuit and crystal oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620079689.6U CN205545164U (en) | 2016-01-27 | 2016-01-27 | Power amplifier self -adaptation linearized system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620079689.6U CN205545164U (en) | 2016-01-27 | 2016-01-27 | Power amplifier self -adaptation linearized system |
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| CN205545164U true CN205545164U (en) | 2016-08-31 |
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| CN201620079689.6U Ceased CN205545164U (en) | 2016-01-27 | 2016-01-27 | Power amplifier self -adaptation linearized system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018137244A1 (en) * | 2017-01-26 | 2018-08-02 | Telefonaktiebolaget Lm Ericsson (Publ) | Apparatus and method for improving efficiency of power amplifier |
| CN116073771A (en) * | 2023-02-08 | 2023-05-05 | 中国科学院近代物理研究所 | Solid state power source linearization system and method for particle accelerator |
-
2016
- 2016-01-27 CN CN201620079689.6U patent/CN205545164U/en not_active Ceased
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018137244A1 (en) * | 2017-01-26 | 2018-08-02 | Telefonaktiebolaget Lm Ericsson (Publ) | Apparatus and method for improving efficiency of power amplifier |
| US10447209B2 (en) | 2017-01-26 | 2019-10-15 | Telefonaktiebolaget Lm Ericsson (Publ) | Apparatus and method for improving efficiency of power amplifier |
| CN116073771A (en) * | 2023-02-08 | 2023-05-05 | 中国科学院近代物理研究所 | Solid state power source linearization system and method for particle accelerator |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| IW01 | Full invalidation of patent right | ||
| IW01 | Full invalidation of patent right |
Decision date of declaring invalidation: 20220817 Decision number of declaring invalidation: 57001 Granted publication date: 20160831 |