Power amplifier

Abstract

The utility model discloses a power amplifier which comprises a radio frequency input module, a low noise amplifier module, a first-stage driving power amplifier module, a second-stage driving power amplifier module, a third-stage driving power amplifier module and a final-stage power amplifier module which are connected in sequence, the radio frequency input module comprises a temperature compensation attenuator, a directional coupler and a radio frequency switch assembly which are connected in sequence, and a detector connected with the directional coupler; the temperature compensation attenuator is externally connected with an input signal and carries out radio frequency attenuation adjustment. The directional coupler is connected with the temperature compensation attenuator and is combined with the detector to detect the power of an input signal; the low-noise amplifier module comprises a first-stage low-noise amplifier, a first-stage equalizer, a second-stage low-noise amplifier and a second-stage equalizer which are connected in sequence; the input of the first-stage low noise amplifier is connected with the output of the radio frequency switch assembly; the first-stage driving power amplifier module is connected with the output of the second-stage equalizer and carries out first-stage driving power amplification.

Description

TECHNICAL FIELD

[0001] The utility model relates to power amplifier technical field especially a power amplifier. BACKGROUND

[0002] In today's digital age, global information is being transmitted at high speed to everyone. The medium for transmitting these information is wireless electromagnetic wave. According to different frequency bands, electromagnetic wave is divided into many frequency bands, such as 2G communication frequency band, 3G communication frequency band, 4G communication frequency band, 5G communication frequency band and WIFI communication frequency band. In addition, in order to ensure reliable transmission of electromagnetic wave, sufficient power is required for long-distance wireless transmission, and communication base station can provide continuous power supply for electromagnetic wave of specific frequency band. Therefore, with the help of communication base station distributed in every corner of the city, electromagnetic wave can freely transmit various information in the streets and alleys.

[0003] As is known to all, the most important power component in the communication base station is the power amplifier. At present, the frequency band of the power amplifier in the prior art is narrow, which only covers a certain frequency band or a certain specific frequency. When power amplification of different frequency bands is required, multiple branches are set, and multiple amplifiers are set in any branch, which has a complex structure.

[0004] Therefore, it is urgent to provide a power amplifier with simple structure and wide frequency coverage. INVENTION CONTENTS

[0005] In view of the above problems, the purpose of the utility model is to provide a power amplifier, and the technical scheme adopted by the utility model is as follows:

[0006] A power amplifier comprises a radio frequency input module, a low noise amplifier module, a first stage driving power amplifier module, a second stage driving power amplifier module, a third stage driving power amplifier module and a final stage power amplifier module connected in sequence;

[0007] The radio frequency input module comprises a temperature compensation attenuator, a directional coupler and a radio frequency switch assembly connected in sequence, and a detector connected with the directional coupler; the temperature compensation attenuator is externally connected with an input signal and performs radio frequency attenuation adjustment; the directional coupler is connected with the temperature compensation attenuator and combines the detector to perform power detection of the input signal;

[0008] The low noise amplifier module comprises a first stage low noise amplifier, a first stage equalizer, a second stage low noise amplifier and a second stage equalizer connected in sequence; the input of the first stage low noise amplifier is connected with the output of the radio frequency switch assembly; the first stage driving power amplifier module is connected with the output of the second stage equalizer and performs first stage driving power amplification.

[0009] Further, the warm compensation attenuator comprises resistors R3 and R4 arranged in parallel, resistor R5 having one end connected to one parallel end of resistors R3 and R4 and the other end grounded, and resistor R6 having one end connected to the other parallel end of resistors R3 and R4 and the other end grounded.

[0010] Further, the directional coupler is of model RBDC-20-63+, the radio frequency switch component is of model HMC8038LP4CE, and the detector is of model AD8319ACPZ-R7.

[0011] Preferably, the first-stage low-noise amplifier is of model PMA3-83LN+, and the second-stage low-noise amplifier is of model PMA3-83MP+.

[0012] Further, the first-stage equalizer and the second-stage equalizer are of the same structure, and the first-stage equalizer comprises capacitor C20, resistor R15 and capacitor C21 connected in series and then connected between the RFOUT / DCIN pin of the first-stage low-noise amplifier and the RF-IN pin of the second-stage low-noise amplifier, capacitor C19 having one end connected between capacitor C20 and resistor R15 and the other end connected between resistor R15 and capacitor C21, resistor R16 and resistor R17 connected in series and then having one end connected between capacitor C20 and resistor R15 and the other end connected between resistor R15 and capacitor C21, and resistor R19 and inductor L5 connected in series and then having one end connected between resistor R16 and resistor R17 and the other end grounded.

[0013] Further, the first-stage driving power amplifier module comprises field effect tube U6, capacitor C41, capacitor C43 and inductor L7 connected in series and then having one end connected to the gate of field effect tube U6, resistor R22 connected in parallel between the ends of capacitor C41, inductor L6 having one end connected to the gate of field effect tube U6, capacitor C24, capacitor C25 and capacitor C26 connected in parallel and then having one end connected to the other end of inductor L6 and the other end grounded, capacitor C42 having one end connected to the drain of field effect tube U6, and capacitor C27, capacitor C28, capacitor C29 and capacitor C30 connected in parallel and then having one end connected to the drain of field effect tube U6 and the other end grounded; and the low-noise amplifier module is connected between capacitor C43 and inductor L7.

[0014] Further, the second-stage driving power amplifier module comprises a field effect tube U5, a capacitor C100, a capacitor C44 and a resistor R21 connected in series and with one end of the capacitor C100 connected to a gate of the field effect tube U5, a resistor R20 connected in parallel between two ends of the capacitor C100, a resistor R31 connected with one end of the resistor R31 connected to the gate of the field effect tube U5, a capacitor C31, a capacitor C32, a capacitor C33, a capacitor C34 and a capacitor C35 connected in parallel and with one end of the capacitor C31 connected to a drain of the field effect tube U5, a capacitor C45 connected with one end of the capacitor C45 connected to the drain of the field effect tube U5, and a capacitor C36, a capacitor C37, a capacitor C38, a capacitor C39 and a capacitor C40 connected in parallel and with one end of the capacitor C36 connected to the drain of the field effect tube U5 and the other end grounded.

[0015] Further, the third-stage driving power amplifier module comprises a first sub-circuit driving power amplifier module and a second sub-circuit driving power amplifier module which are arranged in parallel and have the same structure, a sub-circuit bridge U11 arranged at input ends of the first sub-circuit driving power amplifier module and the second sub-circuit driving power amplifier module, and a main-circuit bridge U12 arranged at output ends of the first sub-circuit driving power amplifier module and the second sub-circuit driving power amplifier module.

[0016] The first sub-circuit driving power amplifier module comprises a field effect tube U8, a capacitor C62 and a capacitor C101 connected in series and with one end of the capacitor C62 connected to the sub-circuit bridge U11 and the other end connected to a gate of the field effect tube U8, a resistor R23 connected in parallel between two ends of the capacitor C101, a resistor R32 connected with one end of the resistor R32 connected to the gate of the field effect tube U8, a capacitor C52, a capacitor C53, a capacitor C54, a capacitor C55 and a capacitor C56 connected in parallel and with one end of the capacitor C52 connected to a drain of the field effect tube U8, a capacitor C63 connected with one end of the capacitor C63 connected to the drain of the field effect tube U8 and the other end connected to the main-circuit bridge U12, and a capacitor C57, a capacitor C58, a capacitor C59, a capacitor C60 and a capacitor C61 connected in parallel and with one end of the capacitor C57 connected to the drain of the field effect tube U8 and the other end grounded.

[0017] Further, the third-stage driving power amplifier module comprises a first sub-circuit driving power amplifier module and a second sub-circuit driving power amplifier module which are arranged in parallel and have the same structure, a sub-circuit bridge U11 arranged at input ends of the first sub-circuit driving power amplifier module and the second sub-circuit driving power amplifier module, and a main-circuit bridge U12 arranged at output ends of the first sub-circuit driving power amplifier module and the second sub-circuit driving power amplifier module.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] (1)The utility model discloses a radio frequency input module is set up, and is composed of 4 parts such as temperature compensation attenuator, directional coupler, radio frequency switch and detector, wherein, temperature compensation attenuator adjusts radio frequency attenuation under the different temperature application environment of product, to guarantee that the gain fluctuation of power amplifier is at different temperatures, ≤±3dB. Meanwhile, the utility model discloses a directional coupler and detector collocation design, can real -time input power detection, realizes input protection function, thereby protects power amplifier chip from burning. In addition, radio frequency switch can be controlled by the user, and output high -power pulse modulation signal or lower static bottom noise.

[0020] (2)The utility model discloses a low noise amplifier module is set up, and is composed of 4 parts such as first stage low noise amplifier, first stage equalizer, second stage low noise amplifier, second stage equalizer. Among them, the noise figure of first stage low noise amplifier is 1.5, and the gain is 21dB±1.5dB. And first stage equalizer and second stage equalizer can improve overall link gain flatness. In addition, the gain of second stage low noise amplifier is 19.5dB±1.5dB, and the output P1dB power is not less than 25dBm. The low noise module of the embodiment mainly improves link noise, as the adjustment link (improvement from ±5dB to ±2dB) of overall link gain flatness, and also provides drive signal for the post stage drive module.

[0021] (3)The utility model discloses a first stage drive power amplifier module, second stage drive power amplifier module, third stage drive power amplifier module and last stage power amplifier module are set up, and power amplification is carried out, guaranteeing its drive reliability.

[0022] (4)The utility model discloses a shunt bridge, two shunt drive power amplifier modules and a combiner bridge are arranged in the third stage drive power amplifier module and the last stage power amplifier module, and the third stage drive power amplifier module and the last stage power amplifier module are matched between stages by adopting the bridge synthesis mode, and the flatness of overall circuit gain is improved.

[0023] In summary, the utility model has the advantages such as simple structure, wide frequency coverage, and has very high practical value and popularization value in the field of power amplifier technology. ACCURACY

[0024] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be briefly introduced to the drawing needed in the embodiment, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as the limitation to the protection scope, and for the person skilled in the art, other related drawings can also be obtained according to these drawings without the creative labor.

[0025] Figure 1The utility model discloses a principle diagram of a low noise amplifier module.

[0026] Figure 2 The utility model discloses a principle diagram of a low noise amplifier module.

[0027] Figure 3 The utility model discloses a principle diagram of a low noise amplifier module.

[0028] Figure 4 The utility model discloses a principle diagram of a low noise amplifier module.

[0029] Figure 5 The utility model discloses a principle diagram of a low noise amplifier module.

[0030] Figure 6 The utility model discloses a principle diagram of a low noise amplifier module.

[0031] Figure 7 The utility model discloses a principle diagram of a low noise amplifier module.

[0032] Figure 8 The utility model discloses a principle diagram of a low noise amplifier module.

[0033] Figure 9 The utility model discloses a principle diagram of a low noise amplifier module.

[0034] Figure 10 The utility model discloses a principle diagram of a low noise amplifier module.

[0035] Figure 11 The utility model discloses a principle diagram of a low noise amplifier module.

[0036] Figure 12 The utility model discloses a principle diagram of a low noise amplifier module.

[0037] Figure 13 The utility model discloses a principle diagram of a low noise amplifier module.

[0038] Figure 14 The utility model discloses a principle diagram of a low noise amplifier module.

[0039] Figure 15 The utility model discloses a principle diagram of a low noise amplifier module.

[0040] Figure 16 The utility model discloses a principle diagram of a low noise amplifier module.

[0041] Figure 17 The power test curve diagram of the third-stage driving power amplifier module in the utility model.

[0042] Figure 18 The gain test curve diagram of the final-stage power amplifier module in the utility model.

[0043] Figure 19 The power test curve diagram of the final-stage power amplifier module in the utility model.

[0044] Figure 20 The gain test curve diagram of the overall power amplifier circuit in the utility model.

[0045] Figure 21 The power test curve diagram of the overall power amplifier circuit in the utility model. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the present application clearer, the utility model will be further described below in combination with the drawings and embodiments, and the embodiments of the utility model include but are not limited to the following embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present application.

[0047] In the present embodiment, the term "and / or" is merely used to describe the association relationship of the associated objects, and can represent three kinds of relationships, for example, A and / or B can represent the three cases of A alone, A and B together, and B alone.

[0048] The terms "first" and "second" and the like in the description and claims of the present embodiment are used to distinguish different objects, and are not used to describe the specific order of the objects. For example, the first target object and the second target object are used to distinguish different target objects, and are not used to describe the specific order of the target objects.

[0049] In the embodiments of the present application, the words "exemplary" or "for example" are used to represent an example, illustration or description. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. On the contrary, the words "exemplary" or "for example" are intended to present the relevant concept in a specific manner.

[0050] In the description of the embodiments of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more. For example, a plurality of processing units refers to two or more processing units; a plurality of systems refers to two or more systems.

[0051] AsFigures 1 to 21 As shown in the embodiment, the power amplifier is composed of six modules, i.e., a radio frequency input module, a low noise amplifier module, a first-stage driving power amplifier module, a second-stage driving power amplifier module, a third-stage driving power amplifier module, and a final-stage power amplifier module.

[0052] The six circuit modules will be described in detail as follows:

[0053] The first part is the radio frequency input module, as shown in Figure 1 and Figure 2 , which is composed of four parts, i.e., a temperature compensation attenuator, a directional coupler, a radio frequency switch, and a detector. The temperature compensation attenuator adjusts the radio frequency attenuation according to the different temperature application environment of the product, so as to ensure that the gain fluctuation of the power amplifier is ≤±3dB at different temperatures. At the same time, the temperature compensation attenuator is designed in combination with the directional coupler and the detector, so that the input power can be detected in real time, the input protection function is realized, and the power amplifier chip is protected from burning. The radio frequency switch can be controlled by the user to output a high-power pulse modulation signal or a lower static noise floor.

[0054] The second part is the low noise amplifier module, as shown in Figure 3 , Figures 8 to 11 which is composed of four parts, i.e., a first-stage low noise amplifier, a first-stage equalizer, a second-stage low noise amplifier, and a second-stage equalizer. The first-stage low noise amplifier has a gain of 21dB±1.5dB and an output P1dB power not less than 19dBm. The first-stage equalizer and the second-stage equalizer can improve the overall link gain flatness. The second-stage low noise amplifier has a gain of 19.5dB±1.5dB and an output P1dB power not less than 24dBm. This low noise module mainly improves the link noise and serves as an adjustment link (from ±5dB to ±2dB) of the overall link gain flatness, and also provides a driving signal for the subsequent driving module.

[0055] The third part is the first-stage driving power amplifier module, as shown in Figure 4 , Figure 12 and Figure 13As shown, the first-stage driving power amplifier module is composed of matching inductor L7, DC blocking capacitors C42 and C43, equalizer C41 and R22, gate supply circuit, CG2H40010F power amplifier (i.e. field effect tube as power amplifier), drain supply circuit and the like. Among them, the matching inductor L7 and the equalizer C41 and R22 can improve the input standing wave and the gain flatness of the first-stage amplifier. The DC blocking capacitors C42 and C43 can avoid the drain voltage and the gate voltage from being connected to other radio frequency circuits respectively. The gate supply circuit plays a role of negative voltage filtering and blocking radio frequency signals. The CG2H40010F power amplifier is the core device of the module. The drain supply circuit plays a role of positive voltage filtering and blocking radio frequency signals. The gain of the first-stage driving power amplifier module is 10dB±0.2dB, and the output P1dB power is not less than 36dBm. This driving module mainly provides driving signals for the subsequent-stage driving module, and also has a certain link gain flatness adjustment effect.

[0056] The fourth part, the second-stage driving power amplifier module: as shown in Figure 5 、 Figure 14 and Figure 15 , the second-stage driving power amplifier module is composed of 3dB attenuator R21 (i.e. resistor R21 as attenuator), DC blocking capacitors C44 and C45, equalizer C100 and R20, gate supply circuit, NU5904 power amplifier, drain supply circuit and the like. Among them, the 3dB attenuator R21 and the equalizer C100 and R20 can improve the input standing wave and the gain flatness of the second-stage amplifier. The DC blocking capacitors C44 and C45 can avoid the drain voltage and the gate voltage from being connected to other radio frequency circuits respectively. The gate supply circuit plays a role of negative voltage filtering and blocking radio frequency signals. The NU5904 power amplifier is the core device of the module. The drain supply circuit plays a role of positive voltage filtering and blocking radio frequency signals. The gain of the second-stage driving power amplifier module is 11.5dB±1dB, and the output P1dB power is not less than 44.5dBm. This driving module mainly serves as a bridge linking the first-stage driving and the third-stage driving, improves the inter-stage matching, improves the gain flatness, and provides good matching driving signals for the subsequent-stage driving module.

[0057] The fifth part, the third-stage driving power amplifier module: as shown in Figure 6 、 Figure 16 and Figure 17As shown in the figure, the third-stage driving power amplifier module is composed of a shunt bridge U11, two shunt driving power amplifier modules, a combining bridge U12 and the like. The shunt bridge U11 can improve the input standing wave, thereby improving the inter-stage matching of the second-stage and third-stage power amplifier modules. The two shunt driving power amplifier modules work independently, but the phase and gain of the two modules need to be consistent. The combining bridge U12 can ensure that the output powers of the two power amplifier modules can be superimposed on each other, thereby increasing the output power. The third-stage driving power amplifier module has a gain of 11dB±1dB, and the output P1dB power is not less than 47.5dBm. The driving module mainly provides sufficient driving signals for the final-stage power amplifier, and has the self-protection and isolation functions when the output is open.

[0058] The sixth part, the final-stage power amplifier module: as shown in the figure, Figure 7 、 Figure 18 and Figure 19 , the final-stage power amplifier module is composed of a shunt bridge U9, two GN2060-P50F power amplifier modules, a combining bridge U10 and the like. The shunt bridge U9 can improve the input standing wave, thereby improving the inter-stage matching of the third-stage driving power amplifier module and the final-stage power amplifier module. The two GN2060-P50F power amplifier modules work independently, and the core device is the GN2060-P50F power amplifier. The phase and gain of the two modules need to be consistent. The combining bridge U10 can ensure that the output powers of the two power amplifier modules can be superimposed on each other, thereby increasing the output power. The final-stage power amplifier module has a gain of 15dB±3dB in the 2-6GHz frequency band, and the output saturation power is not less than 53dBm, i.e. 200W. The final-stage power amplifier module mainly ensures the output power of the whole link, and has the open-circuit protection function.

[0059] In the embodiment, the overall gain and saturation are tested, as shown in the figures, Figure 20 and Figure 21 . It can be seen from the figures that the overall gain is in the range of 60-66dB, and the input signal power of about 0dBm can push the power amplifier to the saturation power state. In terms of power, the saturation power of the final test is in the range of 2-6GHz, the minimum power is 53.07dBm, i.e. 202W, and the maximum power is 54.71dBm, i.e. 295W. Therefore, the power amplifier meets the 200W radio frequency output power in the whole frequency band.

[0060] The above embodiment is only a preferred embodiment of the utility model, and does not limit the protection scope of the utility model. Any change made by using the design principle of the utility model and non-creative labor on this basis shall belong to the protection scope of the utility model.

Claims

1. A power amplifier, characterized by, The radio frequency input module, the low noise amplifier module, the first-stage driving power amplifier module, the second-stage driving power amplifier module, the third-stage driving power amplifier module and the final-stage power amplifier module are sequentially connected. The radio frequency input module comprises a temperature compensation attenuator, a directional coupler and a radio frequency switch assembly which are sequentially connected, and a detector connected with the directional coupler; the temperature compensation attenuator is externally connected with an input signal and performs radio frequency attenuation adjustment; the directional coupler is connected with the temperature compensation attenuator and performs power detection of the input signal in combination with the detector. The low noise amplifier module comprises a first-stage low noise amplifier, a first-stage equalizer, a second-stage low noise amplifier and a second-stage equalizer which are sequentially connected; the input of the first-stage low noise amplifier is connected with the output of the radio frequency switch assembly; the first-stage driving power amplifier module is connected with the output of the second-stage equalizer and performs first-stage driving power amplification.

2. A power amplifier according to claim 1, characterized in that The temperature compensation attenuator comprises resistors R3 and R4 which are connected in parallel, a resistor R5 having one end connected with one parallel end of the resistors R3 and R4 and the other end grounded, and a resistor R6 having one end connected with the other parallel end of the resistors R3 and R4 and the other end grounded.

3. A power amplifier according to claim 2, characterised in that The directional coupler is of the RBDC-20-63+ type; the radio frequency switch assembly is of the HMC8038LP4CE type; and the detector is of the AD8319ACPZ-R7 type.

4. A power amplifier according to claim 1, characterized in that The first-stage low noise amplifier is of the PMA3-83LN+ type; and the second-stage low noise amplifier is of the PMA3-83MP+ type.

5. A power amplifier according to claim 4, characterised in that The first-stage equalizer and the second-stage equalizer have the same structure, and the first-stage equalizer comprises a capacitor C20, a resistor R15 and a capacitor C21 which are connected in series and then connected between the RFOUT / DCIN pin of the first-stage low noise amplifier and the RF-IN pin of the second-stage low noise amplifier, a capacitor C19 having one end connected between the capacitor C20 and the resistor R15 and the other end connected between the resistor R15 and the capacitor C21, a resistor R16 and a resistor R17 which are connected in series and then connected between the capacitor C20 and the resistor R15 and between the resistor R15 and the capacitor C21, and a resistor R19 and an inductor L5 which are connected in series and then connected between the resistor R16 and the resistor R17 and grounded.

6. A power amplifier according to claim 1, characterized in that The first-stage driving power amplifier module comprises a field effect tube U6, a capacitor C41, a capacitor C43 and an inductor L7 which are connected in series and then connected with one end of the capacitor C41, a resistor R22 connected in parallel between the ends of the capacitor C41, an inductor L6 connected with the gate of the field effect tube U6, a capacitor C24, a capacitor C25 and a capacitor C26 which are connected in parallel and then connected with one end of the inductor L6 and grounded, a capacitor C42 connected with the drain of the field effect tube U6, and a capacitor C27, a capacitor C28, a capacitor C29 and a capacitor C30 which are connected in parallel and then connected with one end of the capacitor C27 and grounded; and the low noise amplifier module is connected between the capacitor C43 and the inductor L7.

7. A power amplifier according to claim 6, characterised in that The second-stage driving power amplifier module comprises a field effect tube U5, a capacitor C100 connected in series with the gate of the field effect tube U5, a capacitor C44 and a resistor R21 connected in parallel, a resistor R20 connected between the two ends of the capacitor C100, a resistor R31 connected with the gate of the field effect tube U5, capacitors C31, C32, C33, C34 and C35 connected in parallel with the other end of the resistor R31 connected with the other end of the resistor R31 and grounded, a capacitor C45 connected with the drain of the field effect tube U5, and capacitors C36, C37, C38, C39 and C40 connected with the drain of the field effect tube U5 and grounded.

8. A power amplifier according to claim 7, characterised in that, The third-stage driving power amplifier module comprises a first sub-circuit driving power amplifier module and a second sub-circuit driving power amplifier module which are arranged in parallel and have the same structure, a sub-circuit bridge U11 arranged at the input ends of the first sub-circuit driving power amplifier module and the second sub-circuit driving power amplifier module, and a main-circuit bridge U12 arranged at the output ends of the first sub-circuit driving power amplifier module and the second sub-circuit driving power amplifier module. The first sub-circuit driving power amplifier module comprises a field effect tube U8, a capacitor C62 and a capacitor C101 connected in series with the other end of the capacitor C62 connected with the gate of the field effect tube U8, a resistor R23 connected between the two ends of the capacitor C101, a resistor R32 connected with the gate of the field effect tube U8, capacitors C52, C53, C54, C55 and C56 connected with the other end of the resistor R32 grounded, a capacitor C63 connected with the drain of the field effect tube U8 and connected with the main-circuit bridge U12, and capacitors C57, C58, C59, C60 and C61 connected with the drain of the field effect tube U8 and grounded.

9. A power amplifier according to claim 8, characterised in that, The final-stage power amplifier module comprises a third sub-circuit driving power amplifier module and a fourth sub-circuit driving power amplifier module which are connected in parallel and have the same structure, a sub-circuit bridge U9 connected at the input ends of the third sub-circuit driving power amplifier module and the fourth sub-circuit driving power amplifier module, and a main-circuit bridge U10 connected at the output ends of the third sub-circuit driving power amplifier module and the fourth sub-circuit driving power amplifier module; the third sub-circuit driving power amplifier module is a power amplifier U7 with the input end connected with the sub-circuit bridge U9, the output end connected with the main-circuit bridge U10 and the model GN2060-P50F.

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