CN101106358A - Linear RF power amplifier circuit and its optimization method - Google Patents
Linear RF power amplifier circuit and its optimization method Download PDFInfo
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- CN101106358A CN101106358A CNA2007100939946A CN200710093994A CN101106358A CN 101106358 A CN101106358 A CN 101106358A CN A2007100939946 A CNA2007100939946 A CN A2007100939946A CN 200710093994 A CN200710093994 A CN 200710093994A CN 101106358 A CN101106358 A CN 101106358A
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Abstract
The invention discloses a linear RF power amplifier circuit comprising two different types of RF power amplifier with a RF bridge connected with the input terminal and the output terminal respectively. One end of each RF bridge is series-connected with a 50 ohm microstrip line and a complex impedance circuit and earthed, the other end is taken as the input terminal or the output terminal of the circuit. The invention also discloses an optimizing method for linear RF power amplifier circuit to optimize the length of the 50 ohm microstrip line and complex impedance parameter value of complex impedance circuit and make the efficacy evaluation parameter of linear RF power amplifier circuit reach the maximum. The invention adopts two different types of RF power amplifier to make the advantages of the two RF power amplifiers get complemented so that the linear and the efficiency of the entire RF power amplifier circuit get improved. The 50 ohm microstrip line is equipped outside the two RF bridges, which realizes more convenient adjustment.
Description
Technical field
The present invention relates to a kind of radio-frequency (RF) power amplifier circuit, especially a kind of linear RF power amplifier circuit.The invention still further relates to the optimization method of this linear RF power amplifier circuit.
Background technology
Radio-frequency power amplifier is the important component part of wireless telecommunication system analog circuit, and its cost can account for about 30% in the base station.It is used to radiofrequency signal is amplified, so that transmission.Its major parameter is linearity and efficient.
Linearity is to characterize the radio-frequency power amplifier parameter of amplifying signal truly.If linear poor in the wireless telecommunication system, can increase the error rate, increase Lin Dao interference (ACPR increase), thereby influence the work quality of communication system.Because the ACPR major part is produced by radio-frequency power amplifier, so weigh the linearity of radio-frequency power amplifier in the practical application with its value.Requirement to base station ACPR on the 3G agreement generally is-45dBc about, digital pre-distortion (DPD) technology that generally adopts is generally 20～25dB to the improvement of radio frequency power amplifier linearity at present, and this just requires the linearity of radio-frequency power amplifier own need be better than-25dBc.Generally require this value to be-35dBc in the research and development, to reserve the surplus of aspects such as production.
Efficient is to characterize radio-frequency power amplifier how many intakes (comprising signal input and direct current imports) are changed into the signal that has been exaggerated and the parameter of exporting.High efficient is the important indicator of wireless telecommunication system radio-frequency power amplifier, directly has influence on heating degree, reliability and the cost of system.So, require efficient high more good more satisfying under the linear prerequisite.
The signal of 3G wireless telecommunication system (as the WCDMA system) generally all has high peak-to-average force ratio (PAR), and promptly for the signal of a certain average power, the peak power of moment is up to more than 10 times.In order to make signal reduce distortion at the peak power place as far as possible, radio-frequency power amplifier all works in the rollback state.As the output average power that requires radio-frequency power amplifier is 40dBm, signal peak-to-average ratio is 10dB, radio-frequency power amplifier should have the fan-out capability about 50dBm so, signal just can distortion like this, but can cause the reduction of efficient, because for the definite radio-frequency power amplifier of fan-out capability, real work power is low more, be that rollback is many more, efficient is just low more.If there is not the power tube of suitable 50dBm fan-out capability, just need to adopt the form of two-way or multi-channel parallel, this can further lower efficiency.
Linear RF power amplifier circuit commonly used at present as shown in Figure 1, the amplifier that comprises two same types, the input of described two radio-frequency power amplifiers is received two outputs of one the one 3db electric bridge respectively, an input termination input signal of a described 3db electric bridge, ground connection behind one 50 Ω resistance of another input series connection, the output of described two radio-frequency power amplifiers is received two inputs of one the 2nd 3db electric bridge respectively, an output of described the 2nd 3db electric bridge is as signal output part, another output ground connection behind another 50 Ω resistance of connecting.Two radio-frequency power amplifiers in this circuit need be taken into account efficient and linearity, the therefore general AB class radio-frequency power amplifier that adopts.The radio-frequency (RF) power amplifier circuit of this structure, though it has taken into account linearity and efficient, linear and efficient can be very not high, is difficult to meet more and more higher specification requirement.Therefore need to adopt some special techniques to improve the performance of high-efficient linear radio-frequency (RF) power amplifier circuit.
The linearization technique that is used for improving the radio-frequency power amplifier linear properties at present mainly contains feed-forward technique and digital pre-distortion technology.Feed-forward technique can obtain high ACPR improvement amount (more than the 25dB), has been a kind of mature technique; Digital pre-distortion technology is rapidly developed along with the quickening of digital signal processor speed, and ACPR improvement amount can reach more than the 20dB, becomes the outer another important linear choice of technology of feed-forward technique.These two kinds of technology can make radio-frequency power amplifier satisfy the ACPR requirement of NodeB substantially.
In recent years, the technology of raising efficiency of RF power amplifier more and more is subjected to attention in the industry, and what propose before a large amount of many years is theoretical developed, and actual the obtaining that has used, and a lot of people that have participate in discussion, research and develop.The radio-frequency power amplifier technology of raising the efficiency at present mainly contains Duo Hate (Doherty) technology, F class radio-frequency power amplifier, envelope-tracking technology, envelope reduction recovery (EER) technology.But the shortcoming that self is all arranged.
The Doherty radio-frequency power amplifier, circuit form is simple, can obtain more improved efficiency about rollback 6dB, is the circuit form of raising the efficiency commonly used at present.As shown in Figure 2, comprise two dissimilar radio-frequency power amplifiers in the Doherty circuit, one is operated in category-A or AB quasi-mode, another is operated in category-B or C quasi-mode, input and output at each radio-frequency power amplifier respectively are in series with one section 50 Ω microstrip line, the two section 50 Ω microstrip line that is connected with the input of two radio-frequency power amplifiers is connected on two outputs of a 3db electric bridge, ground connection behind the resistance of one 50 Ω of an input series connection of described electric bridge, another input connects input signal, and an other end of the two section 50 Ω microstrip line that is connected with the output of two radio-frequency power amplifiers is by a λ
g/ 4 lines are connected, and by an end of the 50 Ω microstrip lines that are connected with described category-A or the AB class radio-frequency power amplifier signal output part as circuit.In the performance optimization process of Doherty power amplifier, need adjust the length of 50 Ω microstrip lines among the figure, thereby influence input, the output impedance of power amplifier, to obtain optimum performance.So in research and development, need to do a plurality of versions of different length, to obtain optimum performance.Owing to the difference of power tube, often need to finely tune the length of these lines in the production, because these 50 Ω microstrip lines in circuit inside, therefore are difficult to realize.The Doherty circuit is to its output four/wavelength transmission line (λ simultaneously
g/ 4 lines) required precision is higher, and this has also influenced its bandwidth and the scope of application.
F class radio-frequency power amplifier works on off state, and efficient can improve, but the improvement of efficient mainly concentrates on the saturation power place, so be applied in more on the mobile terminal device.Base station power amplification generally is not operated in saturation condition, needs and the other technologies combination so this class A amplifier A uses on the base station, and this can cause circuit structure complicated more.
The circuit of envelope-tracking technology, EER technology is divided into two-way on the whole: the radio frequency branch road reaches the power branch with radiofrequency signal envelope correspondence.These two kinds of technology are to having relatively high expectations synchronously between the bandwidth of power branch and the two-way, thus difficult the realization, at present still in development.
Summary of the invention
Technical problem to be solved by this invention provides a kind of linear RF power amplifier circuit, and the optimization method of this linear RF power amplifier circuit, and good linearity and efficient can be arranged, and simple in structure, and debugging is convenient.
For solving the problems of the technologies described above, the technical scheme of linear RF power amplifier circuit of the present invention is, comprise two dissimilar radio-frequency power amplifiers, the input of described two dissimilar radio-frequency power amplifiers is received two outputs of one first radio-frequency bridge respectively, an input termination input signal of described first radio-frequency bridge, ground connection behind one the 1 Ω microstrip line of another input series connection and one the first complex impedance circuit, the output of described two dissimilar radio-frequency power amplifiers is received two inputs of one second radio-frequency bridge respectively, an output of described second radio-frequency bridge is as signal output part, ground connection behind another one the 2 50 Ω microstrip line of output series connection and one the second complex impedance circuit.
The technical scheme of the optimization method of linear RF power amplifier circuit of the present invention is, to the length of described the one 50 Ω microstrip line, the complex impedance of the first complex impedance circuit and the length of the 2 50 Ω microstrip line, the complex impedance of the second complex impedance circuit, 4 parameter values are optimized altogether, make the effect assessment parameter of described linear RF power amplifier circuit reach best, the effect assessment parameter of described linear RF power amplifier circuit is efficient or linearity or the efficient and the linear level of aggregation of described linear RF power amplifier circuit.
The present invention makes that by adopting two dissimilar radio-frequency power amplifiers the advantage of two radio-frequency power amplifiers can be complementary at work, thereby improves the linearity and the efficient of whole radio-frequency (RF) power amplifier circuit; Because two section 50 Ω microstrip line is set at two radio-frequency bridge outsides, so be convenient to more regulate.
Description of drawings
The present invention is further detailed explanation below in conjunction with drawings and Examples:
Fig. 1 is the circuit diagram of existing linear RF power amplifier circuit;
Fig. 2 is the circuit diagram of Doherty radio-frequency (RF) power amplifier circuit;
Fig. 3 is the circuit diagram of linear RF power amplifier circuit of the present invention;
The schematic diagram that Fig. 4 cancels out each other for the distortion of two dissimilar radio-frequency power amplifiers of linear RF power amplifier circuit of the present invention.
Embodiment
The structure of linear RF power amplifier circuit of the present invention can be referring to shown in Figure 3, comprise two dissimilar radio-frequency power amplifiers, these of two dissimilar radio-frequency power amplifiers can be a kind of in category-A, AB class or the category-B, another can be a kind of in category-B or the C class, and the power difference of described two dissimilar radio-frequency power amplifiers; The input of described two dissimilar radio-frequency power amplifiers is received two outputs of one first radio-frequency bridge respectively, an input termination input signal of described first radio-frequency bridge, ground connection behind one the 1 Ω microstrip line of another input series connection and one the first complex impedance circuit, the output of described two dissimilar radio-frequency power amplifiers is received two inputs of one second radio-frequency bridge respectively, an output of described second radio-frequency bridge is as signal output part, ground connection behind another one the 2 50 Ω microstrip line of output series connection and one the second complex impedance circuit.Described radio-frequency bridge can be any one in 3dB～10dB degree of coupling electric bridge.
As shown in Figure 3, the operating state of two-way radio-frequency power amplifier is no longer unified, but one work in linearity pattern preferably, and as category-A, AB class, category-B, one works in the higher pattern of efficient, as category-B, C class.From this point, the present invention is similar to the Doherty radio-frequency power amplifier, but the circuit form among the present invention is more convenient, also more flexible, and because the power of two radio-frequency power amplifiers can be different, therefore the higher bigger power of radio-frequency power amplifier load of efficient can be allowed, thereby the efficient of entire circuit can be further improved.
With the example that is combined as of AB class radio-frequency power amplifier and C class radio-frequency power amplifier, because efficient is improved the efficient of radio-frequency power amplifier than the existence of 6 high C class radio-frequency power amplifiers greatly.But its introduction can cause linear decline generally speaking.If but be provided with properly, can allow its distortion and the linear distortion of AB class radio-frequency power amplifier preferably cancel out each other, reach better linearity, shown in the dotted line after Fig. 4 is synthetic.C class power amplifier is only just started working after input power reaches certain size, so in Fig. 4, when AB class radio-frequency power amplifier works in saturation point (P
-1dBNear the compression point) after, promptly during poor linearity, C class radio-frequency power amplifier is just started working with nonlinear state, and its nonlinear phase and AB class be because that compression produces is non-linear opposite, thereby obtain linearity radio-frequency power amplifier preferably.
So-calledly be provided with properly, it is proper on the one hand to be that AB class and C class operating state need be provided with, and the opportunity that C class power amplifier is opened is fine, the linearity that obtains.Be meant on the other hand the two-way radio-frequency power amplifier input, that output loading need be provided with is suitable, makes the efficient and the linear optimal of circuit, and if linearization technique in conjunction with (as with the DPD technology in conjunction with), also to make circuit can export big as far as possible power.Therefore the present invention also provides a kind of optimization method of above-mentioned radio-frequency (RF) power amplifier circuit, it comprises the length to described the one 50 Ω microstrip line, the complex impedance of the first complex impedance circuit and the length of the 2 50 Ω microstrip line, the complex impedance of the second complex impedance circuit, 4 parameter values are optimized altogether, make the effect assessment parameter of described linear RF power amplifier circuit reach best, the effect assessment parameter of described linear RF power amplifier circuit is efficient or linearity or the efficient and the linear level of aggregation of described linear RF power amplifier circuit.Complex impedance in the first complex impedance circuit comprises resistance R 1 and reactance X1, and reactance can be capacitive reactance or induction reactance; Complex impedance in the first complex impedance circuit comprises resistance R 1 and reactance X1, and reactance can be capacitive reactance or induction reactance.In the process of whole optimization, because the linear optimum value and the optimum value of efficient often can not occur simultaneously, for example will occur therefore that efficient is also raising, and the linear situation that has begun to descend takes place.In actual use, the occasion that has has higher requirement for the efficient of radio-frequency (RF) power amplifier circuit, and can be very not harsh to the requirement of linearity, so just can improve the efficient of radio-frequency (RF) power amplifier circuit as best one can, makes it reach maximum; And the occasion that has has very high requirement to linearity, and not too takes notice of efficient, therefore just can make linearity reach optimum value as far as possible; Occasion in addition all has requirement to linear and efficient, and so just each parameter to circuit is optimized, and possibility linearity and efficient can not reach peak, but can guarantee that linearity and efficient all meet the requirements.Among the present invention, though efficient or linear one of them reached optimum value, compare with other circuit, its another one parameter also can be more satisfactory.
In above-mentioned debug process, when a parameter is optimized, keep other parameter constants, earlier this parameter is changed to any one direction, if the effect assessment parameter of described linear RF power amplifier circuit reduces, then change this parameter to the another one direction, if it is excellent that the effect assessment parameter of described linear RF power amplifier circuit becomes, then continue to change this parameter according to this direction, up to the effect assessment parameter of described linear RF power amplifier circuit no longer become excellent till, optimize other parameter afterwards.
Earlier the length to resistance R 1, reactance X1 and the one 50 Ω microstrip line of the described first complex impedance circuit is optimized, and then the length of resistance R 2, reactance X2 and the 2 50 Ω microstrip line of the described second complex impedance circuit is optimized.By contrast, these three parameters of the length of the resistance R 2 of the described second complex impedance circuit, reactance X2 and the 2 50 Ω microstrip line are greater than the length of resistance R 1, reactance X1 and the one 50 Ω microstrip line of the described first complex impedance circuit to the influence of the linearity of entire circuit and efficient, therefore are optimized with said sequence and are beneficial to the efficient that improves debugging more.
When the length to resistance R 1, reactance X1 and the 50 Ω microstrip lines of the complex impedance circuit of mutual polyphone was optimized, the complex impedance to described complex impedance circuit was optimized earlier, and the length to described 50 Ω microstrip lines is optimized again.For example, when optimizing the first complex impedance circuit and the one 50 Ω microstrip line, resistance R 1 and the reactance X1 to the described first complex impedance circuit is optimized earlier, and the length to described the one 50 Ω microstrip line is optimized then.This is because the length of described the one 50 Ω microstrip line is greater than the resistance R 1 and the reactance X1 of the described first complex impedance circuit to the influence of the linearity of circuit and efficient.Described second complex impedance circuit and the 2 50 Ω microstrip line also are as a same reason.
Before the complex impedance of isolation end of input, output radio-frequency bridge, add 50 Ω microstrip lines, optimize the length of this section microstrip line, will influence the performance of this radio-frequency power amplifier.Radio-frequency power amplifier has surpassed R1+jX1 and R2+jX2 to the sensitivity of 50 Ω microstrip lines.Being of convenient length of it can make radio-frequency power amplifier obtain optimum performance.Therefore, after the value of R1+jX1 and R2+jX2 is determined, can allow every radio-frequency power amplifier all obtain optimal performance as long as change the length of 50 Ω microstrip lines, very convenient.This also is to regulate the reason that 50 Ω microstrip lines can reach better regulating effect after regulating complex impedance earlier.
Each parameter that described needs are optimized is carried out repeatedly loop optimization in a certain order.For example, after optimizing the first complex impedance circuit and the one 50 Ω microstrip line, make the effect assessment parameter of linear RF power amplifier circuit reach the highest at this moment, the second complex impedance circuit and the 2 50 Ω microstrip line have been optimized again, make the effect assessment parameter of linear RF power amplifier circuit reach a new peak again, if at this moment suboptimization first complex impedance circuit and the one 50 Ω microstrip line again might also can further improve the effect assessment parameter of linear RF power amplifier circuit; If continue to optimize the second complex impedance circuit and the 2 50 Ω microstrip line after this, also may improve the effect assessment parameter of linear RF power amplifier circuit, but the amplitude of the effect assessment parameter of linear RF power amplifier circuit lifting more backward is just more little.Carry out repeatedly loop optimization in a certain order by each parameter that described needs are optimized, can further improve the effect assessment parameter of linear RF power amplifier circuit, be linearity and efficient, when linear and efficient can't improve again, perhaps reach the requirement of technology or standard, just can no longer continue circulation.
To the length of described the one 50 Ω microstrip line, the complex impedance R1+jX1 of the first complex impedance circuit and the length of the 2 50 Ω microstrip line, the complex impedance R2+jX2 of the second complex impedance circuit, when 4 parameter values are optimized altogether, also the amplitude to input signal is optimized, the power output that guarantees described linear RF power amplifier circuit is stabilized in a certain value, is convenient to the effect assessment parameter is estimated.
In linear RF power amplifier circuit of the present invention, changing the complex impedance R1+jX1 of the first complex impedance circuit and the complex impedance R2+jX2 of the second complex impedance circuit is easy to realize, can use the lump components and parts, also can adopt the form of distributed constant to realize.In practical operation, the value of finely tuning both if desired makes the performance of radio-frequency power amplifier more excellent, also can carry out easily.This is compared to the Doherty power amplifier very big advantage, and its operability obviously is eager to excel a lot.The form of electric bridge is all used in input and output simultaneously, thereby has simplified the trouble and the uncertainty of design four/wavelength line, and is more succinct, also can be slightly wide with Time Bandwidth.
The value of R1+jX1 and R2+jX2 is decided according to the operating state and the performance number of two-way radio-frequency power amplifier, if two-way is the radio-frequency power amplifier of equal-wattage, identical operating state, then two loads all should be 50 Ω resistance, and this is a kind of special circumstances.For two-way radio-frequency power amplifier particular job state and watt level, their suitable values are set make radio-frequency power amplifier obtain preferable performance.
In order to raise the efficiency, the power division of two branch roads of circuit shown in Figure 3 can not be 1: 1, allows the power output of efficient higher radio frequency power amplifier branch road be higher than the better power output of radio-frequency power amplifier branch road of linearity, can raise the efficiency further.Need among the present invention to use two electric bridges, find in the experiment, sort circuit is relatively more flexible in the selection of the electric bridge degree of coupling.No matter how the power of two branch roads distributes in other words, electric bridge can be selected a kind of in the electric bridge of 3dB～10dB degree of coupling for use, for example adopt various ways such as 3dB electric bridge, 4dB electric bridge, 5dB electric bridge, 6dB electric bridge, it is very little to Effect on Performance, and visible sort circuit form is very flexible.
In force, use a kind of 50W power tube and a kind of 100W power tube power tube as two branch amplifiers of linear amplifier circuit of the present invention, make the circuit of the radio-frequency bridge realization of radio-frequency power amplifier input and output side respectively of a kind of 3dB electric bridge, a kind of 5dB electric bridge, a kind of 6dB electric bridge, all obtain good performance, can be applied in fully on the base station of WCDMA system, and can satisfy system requirements.The radio-frequency power amplifier of 50W branch road is operated in AB class state in the circuit, and the radio-frequency power amplifier of 100W branch road is operated in C class state.With the combination of DPD technology, its linear properties is improved.Because the DPD technology all has requirement to the linearity and the peak power output ability of radio-frequency power amplifier, thus in the debugging of radio-frequency power amplifier for take into account above both, need to sacrifice some efficient.The efficient that finally obtains still has 40%@47dBm.The output of the average power of 47dBm, corresponding to the peak power output ability of the 54dBm of this circuit, rollback 7dB.In this case, the efficient of traditional AB class radio-frequency power amplifier in parallel has about 28%, and the efficient of Doherty power amplifier has about 34%.As seen this inventive circuit efficient on the basis simple, that debugging property is high has improved about 12 percentage points than traditional AB class radio-frequency power amplifier in parallel, owing to adopted the bigger uneven form of C class radio-frequency power amplifier branch road power output, so efficient is also higher than Doherty radio-frequency power amplifier.After high-efficient linear radio-frequency (RF) power amplifier circuit of the present invention and the DPD uniting and adjustment, be input as three carrier wave WCDMA signals, when power output is 47dBm, its performance is that 5MHzACPR is better than-55dBc, 10MACPR is better than-57dBc, be better than with 3GPP standard 5MACPR-45dBc, 10MACPR be better than-and the requirement of 50dBc compares, and very big surplus is arranged.
In sum, the present invention makes that by adopting two dissimilar radio-frequency power amplifiers the advantage of two radio-frequency power amplifiers can be complementary at work, thereby improves the linearity and the efficient of whole radio-frequency (RF) power amplifier circuit; Because 50 Ω microstrip lines are set at two radio-frequency bridge outsides, be convenient to more optimize.
Claims (9)
1. linear RF power amplifier circuit, it is characterized in that, comprise two dissimilar radio-frequency power amplifiers, the input of described two dissimilar radio-frequency power amplifiers is received two outputs of one first radio-frequency bridge respectively, an input termination input signal of described first radio-frequency bridge, ground connection behind one the 1 Ω microstrip line of another input series connection and one the first complex impedance circuit, the output of described two dissimilar radio-frequency power amplifiers is received two inputs of one second radio-frequency bridge respectively, an output of described second radio-frequency bridge is as signal output part, ground connection behind another one the 2 50 Ω microstrip line of output series connection and one the second complex impedance circuit.
2. linear RF power amplifier circuit according to claim 1 is characterized in that, in described two dissimilar radio-frequency power amplifiers, one is a kind of in category-A, AB class or the category-B, and another is a kind of in category-B or the C class.
3. linear RF power amplifier circuit according to claim 1 is characterized in that, the power difference of described two dissimilar radio-frequency power amplifiers.
4. linear RF power amplifier circuit according to claim 1 is characterized in that, described radio-frequency bridge is a kind of in the electric bridge of 3dB～10dB degree of coupling.
5. the optimization method of a linear RF power amplifier circuit as claimed in claim 1, it is characterized in that, length to described the one 50 Ω microstrip line, the complex impedance of the first complex impedance circuit and the length of the 2 50 Ω microstrip line, the complex impedance of the second complex impedance circuit, 4 parameter values are optimized altogether, make the effect assessment parameter of described linear RF power amplifier circuit reach best, the effect assessment parameter of described linear RF power amplifier circuit is efficient or linearity or the efficient and the linear level of aggregation of described linear RF power amplifier circuit.
6. the optimization method of linear RF power amplifier circuit according to claim 5, it is characterized in that, when a parameter is optimized, keep other parameter constants, earlier this parameter is changed to any one direction, if the effect assessment parameter variation of described linear RF power amplifier circuit, then change this parameter to the another one direction, if it is excellent that the effect assessment parameter of described linear RF power amplifier circuit becomes, then continue to change this parameter according to this direction, up to the effect assessment parameter of described linear RF power amplifier circuit no longer become excellent till, optimize other parameter afterwards.
7. the optimization method of linear RF power amplifier circuit according to claim 5, it is characterized in that, earlier the complex impedance of the described first complex impedance circuit and the length of the one 50 Ω microstrip line are optimized, and then the complex impedance of the described second complex impedance circuit and the length of the 2 50 Ω microstrip line are optimized.
8. the optimization method of linear RF power amplifier circuit according to claim 5, it is characterized in that, when the length to the complex impedance of the complex impedance circuit of mutual polyphone and 50 Ω microstrip lines is optimized, complex impedance to described complex impedance circuit is optimized earlier, and the length to described 50 Ω microstrip lines is optimized again.
9. the optimization method of linear RF power amplifier circuit according to claim 5 is characterized in that, each parameter that described needs are optimized is carried out repeatedly loop optimization in a certain order.
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| CN101699836A (en) * | 2009-05-14 | 2010-04-28 | 上海闻泰电子科技有限公司 | Method for debugging radio-frequency circuit through microstrip line |
| CN101834571A (en) * | 2010-05-13 | 2010-09-15 | 上海图越电子有限公司 | Efficient linear power amplifier circuit |
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| CN101834571A (en) * | 2010-05-13 | 2010-09-15 | 上海图越电子有限公司 | Efficient linear power amplifier circuit |
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| CN102761310A (en) * | 2011-04-29 | 2012-10-31 | 中兴通讯股份有限公司 | Doherty power amplifier and implementation method thereof |
| CN102394569A (en) * | 2011-11-02 | 2012-03-28 | 三维通信股份有限公司 | Efficient Doherty power amplifier |
| WO2014190505A1 (en) * | 2013-05-29 | 2014-12-04 | Nokia Corporation | Amplification of a radio frequency signal |
| US9768730B2 (en) | 2013-05-29 | 2017-09-19 | Nokia Technologies Oy | Amplification of a radio frequency signal |
| WO2015117496A1 (en) * | 2014-08-25 | 2015-08-13 | 中兴通讯股份有限公司 | Power amplifier circuit and power amplifier |
| CN113131963A (en) * | 2019-12-31 | 2021-07-16 | 深圳市大富科技股份有限公司 | Compensation circuit and communication circuit |
| CN111416578A (en) * | 2020-05-20 | 2020-07-14 | 优镓科技(北京)有限公司 | Broadband integrated Doherty power amplifier based on low Q output network |
| CN111416578B (en) * | 2020-05-20 | 2023-05-26 | 优镓科技(北京)有限公司 | Broadband integrated Doherty power amplifier based on low Q output network |
| CN115378368A (en) * | 2022-10-26 | 2022-11-22 | 成都广众科技有限公司 | Ultra-wideband solid-state power amplifier |
| CN115378368B (en) * | 2022-10-26 | 2023-03-21 | 成都广众科技有限公司 | Ultra-wideband solid-state power amplifier |
| CN117353260A (en) * | 2023-11-02 | 2024-01-05 | 深圳市恒运昌真空技术有限公司 | Energy overshoot suppression circuit based on balanced power amplifier and control method thereof |
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