Filter power amplifier design method combining matching network and power amplifier overall optimization

Abstract

The invention belongs to the technical field of wireless communication, and particularly relates to a filter power amplifier design method combining matching network and power amplifier overall optimization, which combines S parameter optimization of a passive matching network with overall optimization of power, efficiency, gain and stop-band suppression of a filter power amplifier, and improves the design efficiency of the filter power amplifier according to the characteristics of the matching network and the filter power amplifier. And selecting a proper parameter value as an optimization target. The particle swarm optimization algorithm is utilized to judge the passive matching network when the filter power amplifier is integrally optimized, and then the passive matching network meeting the requirement is subjected to power amplifier integral performance simulation and optimization. According to the method, the matching network is judged to save computing resources, the optimization efficiency can be effectively improved, and the design difficulty of the filtering power amplifier is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless communication, and in particular relates to a filter power amplifier design method combining a matching network with overall optimization of a power amplifier. Background Art

[0002] The power amplifier (PA) is one of the key components commonly used in RF wireless transceivers, and it has a great impact on the bandwidth and efficiency of wireless communication systems. However, when the PA is cascaded with the filter in the receiver or transmitter, the overall efficiency of the wireless communication system will decrease due to the loss and mismatch between the two modules. Therefore, the coordinated design of PAs and filters has gradually become a hot issue in the field of PA research. Unlike the traditional PA cascaded bandpass filter, when designing a filter PA, the filter will be integrated into the output matching network, such as Figure 1 As shown. Correspondingly, the filter structure directly matches the complex impedance required by the transistor, rather than the conventional system impedance of 50 ohms. Therefore, the design of the filter input and output matching network is particularly necessary, which can reduce the interconnection mismatch and insertion loss between the power amplifier and the filter and improve the overall efficiency.

[0003] In the existing research on filter power amplifiers, most of them realize the filtering characteristics by integrating the filter into the output matching network. The existing IEEE Transactions on Microwave Theory and Techniques article Power Amplifiers With Frequency-Selective Matching Networks uses a new filter matching network design theory to design and manufacture a single-stage 4.7GHz, 4W hybrid GaN filter power amplifier. However, the above method is complex to design, and the stopband suppression characteristic of the power amplifier is only 10dB. In addition, when designing the filter power amplifier, the filter output matching network is designed separately, and then combined with the input matching network to form a filter power amplifier for overall simulation analysis. Since the overall performance of the filter power amplifier cannot be taken into account when designing the filter matching network separately, this may cause the filter power amplifier to have a serious decrease in efficiency at certain frequency points within the working frequency band. The existing IEEE Transactions on Microwave Theory and Techniques article Simulated Annealing Particle Swarm Optimization for High-Efficiency Power Amplifier Design uses simulated annealing particle swarm algorithm to optimize the design of broadband high-efficiency power amplifiers and three-band high-efficiency power amplifiers. This method treats the power amplifier as a "black box" and optimizes it by selecting a large number of design parameters to simulate the entire power amplifier. There are many "invalid" simulations in these simulation results that are far from the expected goals, which inevitably leads to the problem that the optimization design takes too long.

[0004] In response to the above problems, the present invention proposes a filter power amplifier design method that combines matching network and overall optimization of power amplifier. First, the filter output matching network is optimized and designed, and the design parameters of the filter output matching network are updated using an optimization algorithm to select a filter output matching network that meets the design requirements; secondly, the input matching network is designed according to the covered frequency band based on the common knowledge known to those skilled in the art; thirdly, the designed input matching network and the filter output matching network that meets the design requirements are used to optimize the power amplifier as a whole; finally, a filter power amplifier that meets the design requirements is obtained. The present invention has very important research value and significance in improving the efficiency of filter power amplifier optimization design and saving computing resources. Summary of the invention

[0005] The purpose of the present invention is to provide a filter power amplifier design method that combines a matching network and an overall optimization of a power amplifier. By selecting a filter output matching network that meets the design requirements, the filter power amplifier is optimized as a whole, thereby improving the efficiency of the filter power amplifier optimization design.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides a filter power amplifier design method combining a matching network and overall power amplifier optimization, comprising the following steps:

[0007] S1 Determine the passband and stopband frequency bands of the filter amplifier, select the design frequency point, analyze and determine the S of the filter output matching network within the passband 21 Target value, determine the required stopband suppression and use it as the target value for matching network optimization;

[0008] S2 determines the power P of the filter amplifier according to the parameters of the selected power amplifier tube. out , efficiency DE, gain Gain and stop-band suppression, and use them as the target values ​​for the overall optimization of the filter amplifier;

[0009] S3 designs the filter output matching network required for the filter amplifier;

[0010] S4 designs the filter amplifier input matching network;

[0011] S5 simulates the designed filter output matching network and obtains the S of the output matching network. 21 parameters, and the S of the passband and stopband 21 The parameters are used as constraints to calculate the S of the filter output matching network. 21 Parameter optimization objective function and stopband suppression optimization objective function;

[0012] S6 determines the S of the filter output matching network 21 Whether the parameter optimization objective function and the stopband suppression optimization objective function meet the requirements, if not, jump to step S7; if yes, execute step S8;

[0013] S7 updates the filter amplifier output matching network design parameters using the optimization algorithm, and jumps to step S5;

[0014] S8 simulates the filter amplifier as a whole according to the designed filter amplifier input matching network and filter output matching network, and obtains the output power P out , efficiency DE, gain Gain, and calculate the output power, efficiency, gain and stop-band suppression optimization objective functions of the filter power amplifier respectively according to the constraints of power, efficiency, gain and stop-band suppression;

[0015] S9 determines whether the filter amplifier output power, efficiency, gain and stopband suppression optimization objective function meet the requirements. If not, jump to step S10; if yes, execute step S11;

[0016] S10 uses the same optimization algorithm as in step S7 to update the filter amplifier output matching network design parameters, and jumps to step S5;

[0017] S11 obtains a filter power amplifier that meets the design requirements.

[0018] Furthermore, the above step S5 includes the following steps:

[0019] S5.1 Select 10 frequency points f in the filter amplifier stop band s1 、f s2 、f s3 、f s4 、f s5 、f s6 、f s7 、f s8 、f s9 、f s10 and the five frequencies f in the passband of the filter amplifier p1 、f p2 、f p3 、f p4 、f p5 ;

[0020] S5.2 According to the filter amplifier output matching network, the S of the designed frequency is simulated and obtained 21 Parameters, calculate the S of the filter output matching network according to the following formula 21 Parameter optimization objective function and stopband suppression optimization objective function;

[0021]

[0022] F OMN =max(F S21 ,F rejection )

[0023] Among them, the passband S 21 The parameter optimization objective function is F S21 , the stopband suppression optimization objective function is F rejection , F OMN is the maximum value of the two objective function values, S 21 (f pi ) is the passband frequency f pi Output matching network S 21 Parameter, S 21 (f si ) is the stop band frequency f si Output matching network S 21 Parameters, O_S 21 and O_rejection are passband S 21 The target value of the parameter and the target value of the stopband rejection.

[0024] Further, if the S21 parameter optimization objective function and the stopband suppression optimization objective function of the filter output matching network in step S6 do not meet the requirements, the filter output matching network design parameters are updated, and the updating method S7 includes:

[0025] S7.1 According to S 21 Parameter optimization objective function F S21 and the stopband suppression optimization objective function F rejection The F corresponding to all design parameters can be obtained OMN Maximum value max(F OMN ), mean(F OMN ) and minimum value min(F OMN ), according to F OMN and the mean value mean(F OMN ) and minimum value min(F OMN ) to determine the weight λ;

[0026]

[0027] Among them, λ min , max are the minimum and maximum values ​​of the pre-set weights;

[0028] S7.2 updates the optimized design parameters according to the following formula;

[0029] V(k+1)=λ{V(k)+c1r1[(X pb (k)-X(k))]+c2r2[((X gb (k)-X(k)))]}

[0030] X(k+1)=X(k)+V(k+1)

[0031] Among them, X represents the position of the particle, that is, the design parameter, and V represents the velocity of the particle. gb and X pb Decision, X gb is the optimal position of the entire particle swarm, X pb is the optimal position of a particle, λ represents the weight, and c1 and c2 are learning factors.

[0032] Furthermore, the above step S8 includes the following steps:

[0033] S8.1 Select 10 frequencies f in the filter amplifier stopband s1 、f s2 、f s3 、f s4 、f s5 、f s6 、f s7、f s8 、f s9 、f s10 and the five frequencies f in the passband of the filter amplifier p1 、f p2 、f p3 、f p4 、f p5 ;

[0034] S8.2 According to the filter output matching network designed in step S3 and the input matching network designed in step S4, the power amplifier performance index of the designed frequency point is simulated, and the output power optimization objective function F of the filter power amplifier is calculated according to the following formula Spectrum , efficiency optimization objective function F DE , gain optimization objective function F Gain and the stopband suppression optimization objective function F Rejection ;

[0035]

[0036] Among them, O_Spectrum is the target value of output power, O_DE is the target value of efficiency, O_Gain is the target value of gain, O_Rejection is the target value of stopband suppression of the filter amplifier, Spectrum(f pi ) is the design frequency f in the passband pi Output power, DE(f pi ) is the design frequency f in the passband pi Efficiency, Gain(f pi ) is the design frequency f in the passband pi Gain(f si ) is the design frequency point f in the stop band si The gain can be obtained by simulation.

[0037] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0038] (1) The present invention can achieve the design of a high-efficiency broadband filter power amplifier. The design steps of the traditional filter power amplifier output matching network are cumbersome and the design is relatively complex. In traditional designs, the filter output matching network is usually designed first, and then it is directly combined with the input matching network to form a filter power amplifier for overall simulation analysis after it meets the design requirements. Since the overall performance of the filter power amplifier cannot be taken into account when the filter matching network is designed and optimized separately, this may cause the filter power amplifier to have a serious drop in efficiency at certain frequency points within the operating frequency band. The present invention avoids the above situation by using a design method that combines the optimization of the filter output matching network with the overall optimization of the filter power amplifier, thereby achieving the design of a high-efficiency broadband filter power amplifier.

[0039] (2) The present invention can reduce the time for overall optimization of the power amplifier using the optimization algorithm and improve the efficiency of the power amplifier optimization design. Traditional power amplifier overall optimization methods usually treat the power amplifier as a "black box" and optimize it by selecting a large number of design parameters to perform overall simulation of the power amplifier. There are many "invalid" simulations in these simulation results that are significantly different from the expected goals, which inevitably leads to the problem that the optimization design takes too long. The filter power amplifier design method that combines the matching network and the overall optimization of the power amplifier proposed in the present invention first optimizes the filter matching network and selects the filter matching network that meets the design requirements; then the selected filter matching network is used to optimize the power amplifier as a whole. This can avoid the problem of too many "invalid" simulations when directly optimizing the overall power amplifier, thereby achieving the purpose of saving computing resources and improving the efficiency of optimization design. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Schematic diagram of the structure of a broadband high-efficiency filter power amplifier.

[0041] Figure 2 Flow chart of the filter power amplifier design method combining matching network and overall power amplifier optimization of the present invention.

[0042] Figure 3 Schematic diagram of the change of design parameters of the filter output matching network of the present invention.

[0043] Figure 4 The filter output matching network structure used in the embodiment of the present invention.

[0044] Figure 5 Schematic diagram of a 3.3-3.7 GHz filter power amplifier optimized for design in an embodiment of the present invention.

[0045] Figure 6 The saturation power and efficiency results of the 3.3-3.7 GHz filter power amplifier optimized by the embodiment of the present invention.

[0046] Figure 7 A diagram showing the small signal S parameter results of a 3.3-3.7 GHz filter power amplifier optimized for design according to an embodiment of the present invention. DETAILED DESCRIPTION

[0047] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. It should be pointed out that the technical solution and design principle of the present invention are described in detail below only with a preferred technical solution, but the protection scope of the present invention is not limited thereto.

[0048] The embodiments are preferred implementations of the present invention, but the present invention is not limited to the above-mentioned implementations. Any obvious improvements, substitutions or modifications that can be made by those skilled in the art without departing from the essential content of the present invention belong to the protection scope of the present invention.

[0049] Figure 2 The flowchart of the filter power amplifier design method combining the matching network and the overall optimization of the power amplifier of the present invention comprises:

[0050] S1 Determine the passband and stopband frequency bands of the filter amplifier, select the design frequency point, analyze and determine the S of the filter output matching network within the passband 21 Target value, determine the required stopband suppression and use it as the target value for matching network optimization;

[0051] S2 determines the power P of the filter amplifier according to the parameters of the selected power amplifier tube. out , efficiency DE, gain Gain and stop-band suppression, and use them as the target values ​​for the overall optimization of the filter amplifier;

[0052] S3 designs the filter output matching network required for the filter amplifier;

[0053] S4 designs the filter amplifier input matching network;

[0054] S5 simulates the designed filter output matching network and obtains the S of the output matching network. 21 parameters, and the S of the passband and stopband 21 The parameters are used as constraints to calculate the S of the filter output matching network. 21 Parameter optimization objective function and stopband suppression optimization objective function;

[0055] S6 determines the S of the filter output matching network 21 Whether the parameter optimization objective function and the stopband suppression optimization objective function meet the requirements, if not, jump to step S7; if yes, execute step S8;

[0056] S7 updates the filter amplifier output matching network design parameters using the optimization algorithm, and jumps to step S5;

[0057] S8 simulates the filter amplifier as a whole according to the designed filter amplifier input matching network and filter output matching network, and obtains the output power P out , efficiency DE, gain Gain, and calculate the output power, efficiency, gain and stop-band suppression optimization objective functions of the filter power amplifier respectively according to the constraints of power, efficiency, gain and stop-band suppression;

[0058] S9 determines whether the filter amplifier output power, efficiency, gain and stopband suppression optimization objective function meet the requirements. If not, jump to step S10; if yes, execute step S11;

[0059] S10 uses the same optimization algorithm as in step S7 to update the filter amplifier output matching network design parameters, and jumps to step S5;

[0060] S11 obtains a filter power amplifier that meets the design requirements.

[0061] As a preferred embodiment of the present invention, step S5 includes the following specific contents:

[0062] S5.1 Select 10 frequency points f in the filter amplifier stop band s1 、f s2 、f s3 、f s4 、f s5 、f s6 、f s7 、f s8 、f s9 、f s10 and the five frequencies f in the passband of the filter amplifier p1 、f p2 、f p3 、f p4 、f p5 ;

[0063] S5.2 According to the filter amplifier output matching network, the S of the designed frequency is simulated and obtained 21 Parameters, calculate the S of the filter output matching network according to the following formula 21 Parameter optimization objective function and stopband suppression optimization objective function;

[0064]

[0065] F OMN =max(F S21 ,F rejection )

[0066] Among them, the passband S 21 The parameter optimization objective function is F S21 , the stopband suppression optimization objective function is F rejection , F OMN is the maximum value of the two objective function values, S 21 (f pi ) is the passband frequency f pi Output matching network S 21 Parameter, S 21 (f si ) is the stop band frequency f si Output matching network S21 Parameters, O_S 21 and O_rejection are passband S 21 The target value of the parameter and the target value of the stopband rejection.

[0067] As a preferred embodiment of the present invention, step S7 includes the following specific contents:

[0068] S7.1 According to S 21 Parameter optimization objective function F S21 and the stopband suppression optimization objective function F rejection The F corresponding to all design parameters can be obtained OMN Maximum value max(F OMN ), mean(F OMN ) and minimum value min(F OMN ), according to F OMN and the mean value mean(F OMN ) and minimum value min(F OMN ) to determine the weight λ;

[0069]

[0070] Among them, λ min , max are the minimum and maximum values ​​of the pre-set weights;

[0071] S7.2 updates the optimized design parameters according to the following formula;

[0072] V(k+1)=λ{V(k)+c1r1[(X pb (k)-X(k))]+c2r2[((X gb (k)-X(k)))]}

[0073] X(k+1)=X(k)+V(k+1)

[0074] Among them, X represents the position of the particle, that is, the design parameter, and V represents the velocity of the particle. gb and X pb Decision, X gb is the optimal position of the entire particle swarm, X pb is the optimal position of a particle, λ represents the weight, and c1 and c2 are learning factors.

[0075] As a preferred embodiment of the present invention, step S8 includes the following specific contents:

[0076] S8.1 Select 10 frequencies f in the filter amplifier stopband s1 、f s2 、f s3 、fs4 、f s5 、f s6 、f s7 、f s8 、f s9 、f s10 and the five frequencies f in the passband of the filter amplifier p1 、f p2 、f p3 、f p4 、f p5 ;

[0077] S8.2 According to the filter output matching network designed in step S3 and the input matching network designed in step S4, the power amplifier performance index of the designed frequency point is simulated, and the output power optimization objective function F of the filter power amplifier is calculated according to the following formula Spectrum , efficiency optimization objective function F DE , gain optimization objective function F Gain and the stopband suppression optimization objective function F Rejection ;

[0078]

[0079] Among them, O_Spectrum is the target value of output power, O_DE is the target value of efficiency, O__Gain is the target value of gain, O_Rejection is the target value of stopband suppression of the filter amplifier, Spectrum(f pi ) is the design frequency f in the passband pi Output power, DE(f pi ) is the design frequency f in the passband pi Efficiency, Gain(f pi ) is the design frequency f in the passband pi Gain(f si ) is the design frequency point f in the stop band si The gain can be obtained by simulation.

[0080] The present invention is further described below with reference to a specific embodiment.

[0081] In this embodiment, a Wolfspeed CGH40010F GaN HEMT power amplifier tube is used to design a 3.3-3.7 GHz high-efficiency filter power amplifier, and the dielectric substrate used is a Rogers 4350B plate with εr=3.66 and h=30 mil.

[0082] First, according to step S1, the passband and stopband of the filter power amplifier are determined and the frequency points in the passband and stopband are selected as follows: passband: 3.3, 3.4, 3.5, 3.6, 3.7 GHz stopband: 1.5, 1.7, 1.9, 2.1, 2.3, 4.7, 4.9, 5.1, 5.3, 5.5 GHz, wherein the forward transmission coefficient S of the passband is determined. 21 The target value and the stopband suppression target value are shown in Table 1; secondly, as described in step S2, the output power P of the filter power amplifier is determined according to the rated output power of the power amplifier tube, etc. out , efficiency DE, gain Gain and stopband suppression, and use them as the target values ​​for the overall optimization of the filter power amplifier, as shown in Table 2; as described in step S3, design the filter output matching network corresponding to the filter power amplifier; again, as shown in step S4, design the input matching network of the filter power amplifier; finally, use the S of the filter output matching network 21 Parameter calculation S 21 The parameter optimization objective function and the stopband suppression optimization objective function are used to calculate the output power, efficiency, gain and stopband suppression optimization objective functions using the filter amplifier output power, efficiency and gain, and the overall optimization design of the high-efficiency filter amplifier is performed according to steps S5 to S11. Among them, for the optimization algorithm selected in steps S7 and S10, the embodiment of the present invention adopts a particle swarm algorithm, according to Figure 3 The parameter change mode in Figure 4 The design parameters of the structure (i.e., the width and length of the microstrip line) are updated.

[0083] Table 1 Forward transmission coefficient S of filter output matching network at each frequency point 21 Target value and stopband rejection target value

[0084] Frequency (GHz) 1.5 1.7 1.9 2.1 2.3 O_rejection(dB) 15 15 15 15 15 Frequency (GHz) 3.3 3.4 3.5 3.6 3.7 <![CDATA[O_S 21 (dB)]]> -0.3 -0.3 -0.3 -0.3 -0.3 Frequency (GHz) 4.5 4.7 4.9 5.1 5.3 O_rejection(dB) 15 15 15 15 15

[0085] Table 2 Output power, efficiency, gain and stopband suppression target values ​​of filter amplifier at each frequency point

[0086] Frequency (GHz) 1.5 1.7 1.9 2.1 2.3 O_Rejection(dB) 30 30 30 30 30 Frequency (GHz) 3.3 3.4 3.5 3.6 3.7 O_Spectrum(dBm) 41 41 41 41 41 O_DE(%) 63 61 64 64 64 O_Gain(dB) 12 12 12 12 12 Frequency (GHz) 4.7 4.9 5.1 5.3 5.5 O_Rejection(dB) 30 30 30 30 30

[0087] Figure 4 It is a filter amplifier output matching structure obtained by optimizing the design by the above method, wherein port 1 is connected to the drain of the transistor, and the impedance is the conjugate of the output impedance of the transistor; port 2 is the terminal load impedance, which is generally 50 ohms.

[0088] After clarifying the relevant design goals, the input matching network is designed according to the covered frequency band based on the common knowledge known to those skilled in the art. According to the steps shown in the claims of this patent, the 3.3-3.7GHz filter amplifier combining the matching network and the overall optimization of the power amplifier is optimized. The schematic diagram is shown in the figure. Figure 5 shown.

[0089] Figure 6 and Figure 7 The saturated power, efficiency curve and small signal S parameter curve of the 3.3-3.7GHz high-efficiency filter amplifier designed by the filter amplifier design method combining the matching network and the overall optimization of the power amplifier proposed by the present invention are shown in the figure. As can be seen from the result graph, the saturated output power is between 40.6-42.3dBm, the efficiency is between 64.5-70.5%, and the S in the passband is 21 The rejection rate is greater than 15dB and the stop-band suppression is greater than 30dB, realizing the design of a high-efficiency filter power amplifier.

Claims

1. A filter power amplifier design method combining matching network and overall power amplifier optimization, characterized in that: The following steps are involved: S1 Determine the passband and stopband frequency bands of the filter amplifier, select the design frequency point, analyze and determine the S of the filter output matching network within the passband 21 Target value, determine the required stopband suppression and use it as the target value for matching network optimization; S2 determines the power P of the filter amplifier according to the parameters of the selected power amplifier tube. out , efficiency DE, gain Gain and stop-band suppression, and use them as the target values ​​for the overall optimization of the filter amplifier; S3 designs the filter output matching network required for the filter amplifier; S4 designs the filter amplifier input matching network; S5 simulates the designed filter output matching network and obtains the S of the output matching network. 21 parameters, and the S of the passband and stopband 21 The parameters are used as constraints to calculate the S of the filter output matching network. 21 Parameter optimization objective function and stopband suppression optimization objective function; S6 determines the S of the filter output matching network 21 Whether the parameter optimization objective function and the stopband suppression optimization objective function meet the requirements, if not, jump to step S7; If yes, execute step S8; S7 updates the filter amplifier output matching network design parameters using the optimization algorithm, and jumps to step S5; S8 simulates the filter amplifier as a whole according to the designed filter amplifier input matching network and filter output matching network, and obtains the output power P out , efficiency DE, gain Gain, and calculate the output power, efficiency, gain and stop-band suppression optimization objective functions of the filter power amplifier respectively according to the constraints of power, efficiency, gain and stop-band suppression; S9 determines whether the filter amplifier output power, efficiency, gain and stopband suppression optimization objective function meet the requirements, if not, jump to step S10; If yes, execute step S11; S10 uses the same optimization algorithm as in step S7 to update the filter amplifier output matching network design parameters, and jumps to step S5; S11 obtains a filter power amplifier that meets the design requirements.

2. The filter power amplifier design method combining matching network and overall power amplifier optimization according to claim 1 is characterized in that: The step S5 comprises the following steps: S5.1 Select 10 frequency points f in the filter amplifier stop band s1 、f s2 、f s3 、f s4 、f s5 、f s6 、f s7 、f s8 、f s9 、f s10 and the five frequencies f in the passband of the filter amplifier p1 、f p2 、f p3 、f p4 、f p5 ; S5.2 According to the filter amplifier output matching network, the S of the designed frequency is simulated and obtained 21 Parameters, calculate the S of the filter output matching network according to the following formula 21 Parameter optimization objective function and stopband suppression optimization objective function; F OMN =max(F S21 ,F rejection ) Among them, the passband S 21 The parameter optimization objective function is F S21 , the stopband suppression optimization objective function is F rejection , F OMN is the maximum value of the two objective function values, S 21 (f pi ) is the passband frequency f pi Output matching network S 21 Parameter, S 21 (f si ) is the stop band frequency f si Output matching network S 21 Parameters, O_S 21 and O_rejection are passband S 21 The target value of the parameter and the target value of the stopband rejection.

3. The filter power amplifier design method combining matching network and overall power amplifier optimization according to claim 1 is characterized in that: For the filter output matching network S in step S6 21 If the parameter optimization objective function and the stopband suppression optimization objective function do not meet the requirements, the filter output matching network design parameters are updated, and the updating method S7 includes: S7.1 According to S 21 Parameter optimization objective function F S21 and the stopband suppression optimization objective function F rejection The F corresponding to all design parameters can be obtained OMN Maximum value max(F OMN ), mean(F OMN ) and minimum value min(F OMN ), according to F OMN and the mean value mean(F OMN ) and minimum value min(F OMN ) to determine the weight λ; Among them, λ min , max are the minimum and maximum values ​​of the pre-set weights; S7.2 updates the optimized design parameters according to the following formula; V(k+1)−λ{V(k)+c1r1[(X pb (k)-X(k))]+c2r2[((X gb (k)-X(k)))]} X(k+1)=X(k)+V(k+1) Among them, X represents the position of the particle, that is, the design parameter, and V represents the velocity of the particle. gb and X pb Decision, X gb is the optimal position of the entire particle swarm, X pb is the optimal position of a particle, λ represents the weight, and c1 and c2 are learning factors.

4. The filter power amplifier design method combining matching network and overall power amplifier optimization according to claim 1, characterized in that: The step S8 comprises the following steps: S8.1 Select 10 frequencies f in the filter amplifier stopband s1 、f s2 、f s3 、f s4 、f s5 、f s6 、f s7 、f s8 、f s9 、f s10 and the five frequencies f in the passband of the filter amplifier p1 、f p2 、f p3 、f p4 、f p5 ; S8.2 According to the filter output matching network designed in step S3 and the input matching network designed in step S4, the power amplifier performance index of the designed frequency point is simulated, and the output power optimization objective function F of the filter power amplifier is calculated according to the following formula Spectrum , efficiency optimization objective function F DE , gain optimization objective function F Gain and the stopband suppression optimization objective function F Rejection ; Among them, O_Spectrum is the target value of output power, O_DE is the target value of efficiency, O_Gain is the target value of gain, O_Rejection is the target value of stopband suppression of the filter amplifier, Spectrum(f pi ) is the design frequency f in the passband pi Output power, DE(f pi ) is the design frequency f in the passband pi Efficiency, Gain(f pi ) is the design frequency f in the passband pi Gain(f si ) is the design frequency point f in the stop band si The gain can be obtained by simulation.

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