Transmitting link, radio frequency front-end signal link and radio frequency front-end module

Abstract

The invention relates to the technical field of radio frequency communication, and discloses a transmitting link, a radio frequency front-end signal link and a radio frequency front-end module, and the transmitting link comprises a gain filtering module which comprises multiple stages of driving amplifiers and a filter, and the filter is located behind any stage of driving amplifier in the multiple stages of driving amplifiers in the radio frequency signal transmission direction; the input end of the power amplifier is connected with the gain filtering module, and the output end of the power amplifier is connected with the transmitting port of the transmitting link; the driving amplifier, located behind the filter in the radio-frequency signal transmission direction, in the multi-stage driving amplifier serves as a cooperative amplifier, the cooperative amplifier and the power amplifier cooperatively work in a linear working mode, and the linear working mode is a working mode with emphasis on linearity. The beneficial effects are that through the pre-filter, clutters generated by the driving amplifier can be eliminated by using the filter, the power loss of the filter to a transmitting link is reduced, and the radio frequency signal quality of the transmitting link is improved.

Description

Technical Field

[0001] This application relates to the field of radio frequency communication technologies, and particularly to a transmitting link, a radio frequency front-end signal link, and a radio frequency front-end module. Background Art

[0002] The development of wireless communication technologies has enabled communication systems to achieve more communication functions, promoting the widespread application of wireless communication technologies in multiple fields. With the continuous increase in application requirements, users' performance requirements for communication systems have gradually increased, not only leading to an increase in the complexity of communication systems, but also posing more stringent requirements for signal quality. In the field of radio frequency communication technologies, a radio frequency front-end signal link usually includes a transmitting link and a receiving link. Among them, the transmitting link needs to handle more communication tasks and communication metrics, making the transmitting link the channel with the most metrics, the highest power consumption, and the highest performance requirements in the radio frequency front-end signal link.

[0003] In related technologies, the radio frequency signal quality of the transmitting link still needs to be improved. Summary of the Invention

[0004] This application provides a transmitting link, a radio frequency front-end signal link, and a radio frequency front-end module. By means of a pre-filter, the power loss caused by the filter to the transmitting link is reduced, and the power efficiency of the transmitting link is improved.

[0005] To achieve the above object, the main technical solutions adopted in this application include:

[0006] In a first aspect, an embodiment of this application provides a transmitting link, and the transmitting link includes:

[0007] A gain filtering module, the gain filtering module includes a multi-stage driver amplifier and a filter, and the filter is located after any stage of the driver amplifier in the multi-stage driver amplifier in the radio frequency signal transmission direction;

[0008] A power amplifier, an input end of the power amplifier is connected to the gain filtering module, and an output end of the power amplifier is connected to a transmitting port of the transmitting link;

[0009] The driver amplifier in the multi-stage driver amplifier that is located after the filter in the radio frequency signal transmission direction serves as a cooperative amplifier, and the cooperative amplifier and the power amplifier work together in a linear working mode; wherein, the linear working mode is a working mode that emphasizes linearity.

[0010] The transmission link proposed in the embodiment of the present application sets the filter after any stage of the multi-stage driver amplifier and before the power amplifier, and enables the cooperative amplifier and the power amplifier after the filter to work cooperatively in a linear working mode. This not only reduces the power loss caused by the filter to the transmission link and improves the power efficiency of the transmission link, but also ensures that the radio frequency signal after the filter can still have a high linearity through the cooperative work between the amplifiers, further improving the radio frequency signal quality of the transmission link. Compared with the related art, in the present application, by placing the filter in front of the power amplifier, the fixed proportion of loss brought by the filter is loaded on the radio frequency signal with a smaller power, reducing the power loss of the radio frequency signal and effectively improving the power efficiency of the transmission link. At the same time, the present application also uses the filter to eliminate the clutter generated by the driver amplifier, effectively improving the cleanliness of the radio frequency signal.

[0011] Optionally, the multi-stage driver amplifiers are connected in sequence, and the output end of the last stage of the multi-stage driver amplifier along the radio frequency signal transmission direction is used as the output end of the gain filtering module;

[0012] The filter is located after any stage of the multi-stage driver amplifier in the radio frequency signal transmission direction. The output end of the any stage of the driver amplifier is connected to the input end of the filter, and the output end of the filter is connected to the input end of the next stage of the driver amplifier after the any stage of the driver amplifier.

[0013] Optionally, the driver amplifier in the multi-stage driver amplifier that is located before the filter in the radio frequency signal transmission direction is used as an efficiency amplifier, and the working mode of the efficiency amplifier is a balanced working mode; wherein, the balanced working mode is a working mode that takes into account both linearity and power efficiency.

[0014] Optionally, the multi-stage driver amplifiers are connected end to end in sequence. The output end of the last stage of the multi-stage driver amplifier along the radio frequency signal transmission direction is connected to the input end of the filter, and the output end of the filter is used as the output end of the gain filtering module.

[0015] Optionally, the working modes of the multi-stage driver amplifiers are all balanced working modes; wherein, the balanced working mode is a working mode that takes into account both linearity and power efficiency.

[0016] Optionally, the power amplifier is located after the filter in the radio frequency signal transmission direction, and is used to amplify the power of the radio frequency signal after passing through the filter to reduce the power loss of the transmission link.

[0017] Optionally, the filter is located after any stage of the driver amplifier in the RF signal transmission direction, and is used to filter out the harmonics and intermodulation interference generated by the driver amplifier located before the filter in the RF signal transmission direction, so as to improve the signal quality of the transmission link.

[0018] Optionally, the transmitting port includes an antenna switch and a transmitting antenna connected in sequence, and the input end of the antenna switch is connected to the output end of the power amplifier.

[0019] In a second aspect, an embodiment of the present application provides an RF front-end signal link, including a modem, an RF transceiver, a receiving link, and a transmitting link as described in any one of the above embodiments.

[0020] In a third aspect, an embodiment of the present application provides an RF front-end module, including the RF front-end signal link as described in any one of the above embodiments. Description of the Drawings

[0021] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic structural diagram of a traditional transmitting link;

[0023] Figure 2 It is a schematic structural diagram of the transmitting link provided by the embodiment of the present application;

[0024] Figure 3 It is a first schematic structural diagram of the transmitting link in the embodiment of the present application;

[0025] Figure 4 It is a second schematic structural diagram of the transmitting link in the embodiment of the present application;

[0026] Figure 5 It is a schematic structural diagram of the RF front-end signal link in the embodiment of the present application.

[0027] Among them, the reference numerals of the schematic diagrams of the specification are as follows: 100. Gain filtering module, 110. Driver amplifier, 111. Cooperative amplifier, 112. Efficiency amplifier, 120. Filter, 200. Power amplifier, 300. Transmitting port. Detailed Embodiments

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0029] The development of wireless communication technology has enabled communication systems to achieve more communication functions, promoting the wide application of wireless communication technology in multiple fields. With the continuous increase in application requirements, users' performance requirements for communication systems have gradually increased, which not only leads to an increase in the complexity of communication systems, but also poses more stringent requirements for signal quality due to complex and diverse communication function requirements. In the field of radio frequency communication technology, the radio frequency front-end signal link usually includes a transmit link and a receive link. Among them, the transmit link needs to handle more communication tasks and communication metrics, making the transmit link the channel with the most metrics, the highest power consumption, and the highest performance requirements in the radio frequency front-end signal link.

[0030] In the related art, the structure of the traditional transmit link is referred to Figure 1 as shown. The traditional transmit link includes a driver amplifier, a power amplifier, a filter, and a transmit port connected in sequence. The transmit port includes an antenna switch and an antenna. In the traditional transmit link, the driver amplifier is used to amplify the power of the radio frequency signal so that the power of the radio frequency signal meets the requirements of the power amplifier; the power amplifier is used to further amplify the power of the radio frequency signal so that the power of the radio frequency signal meets the requirements of signal transmission; the filter is used to filter the radio frequency signal after power amplification, remove clutter, noise, and interference components in the radio frequency signal, improve the linearity of the radio frequency signal, and ensure that the radio frequency signal meets the cleanliness requirements.

[0031] However, in actual situations, although the filter can improve the linearity of the radio frequency signal, the filter will also cause a certain insertion loss to the radio frequency signal in the transmit link, resulting in part of the signal energy in the radio frequency signal being converted into heat and generating power loss, seriously affecting the overall transmission efficiency of the transmit link. In addition, the driver amplifier in the transmit link will also generate nonlinear distortion, thereby introducing a certain amount of clutter into the radio frequency signal and affecting the signal quality of the radio frequency signal. And the radio frequency signal containing clutter is directly input into the power amplifier, which may cause the clutter component to be amplified by the power amplifier, resulting in further contamination of the radio frequency signal and greatly affecting the signal quality of the radio frequency signal.

[0032] Based on the above problems, the present application provides a transmission link, a radio frequency front-end signal link and a radio frequency front-end module, including: a gain filtering module, including a multi-stage driver amplifier and a filter, the filter being located after any one of the multi-stage driver amplifiers in the radio frequency signal transmission direction; a power amplifier, the input end of which is connected to the gain filtering module, and the output end of the power amplifier is connected to the transmission port of the transmission link; the driver amplifier located after the filter in the radio frequency signal transmission direction in the multi-stage driver amplifier is used as a collaborative amplifier, and the collaborative amplifier and the power amplifier work together in a linear working mode, and the linear working mode is a working mode that emphasizes linearity.

[0033] In the transmission link provided by the present application, the filter is arranged after any one of the multi-stage driver amplifiers and before the power amplifier, and the collaborative amplifier and the power amplifier after the filter work together in a linear working mode. This not only reduces the power loss caused by the filter to the transmission link and improves the power efficiency of the transmission link, but also ensures that the radio frequency signal after the filter can still have a high linearity through the collaborative work between the amplifiers, further improving the radio frequency signal quality of the transmission link.

[0034] Compared with the related technology, by placing the filter in front of the power amplifier, the present application loads the fixed proportion loss brought by the filter on the radio frequency signal with a smaller power, reducing the power loss of the radio frequency signal and effectively improving the power efficiency of the transmission link; at the same time, the present application also uses the filter to eliminate the clutter generated by the driver amplifier, effectively improving the cleanliness of the radio frequency signal.

[0035] The transmission link provided in this specification can be applied to communication systems that need to transmit wireless signals, including but not limited to radio frequency front-end signal links, etc., and is used in radio frequency front-end modules, so as to be applicable to a variety of electronic devices. The electronic devices can include laptops, desktop computers, smart phones, smart wearable devices (virtual reality glasses, smart watches, etc.), tablet computers, etc.

[0036] In this embodiment, a transmission link is provided, which can be used in the above communication system. Refer to Figure 2 As shown, the transmission link includes a gain filtering module, the gain filtering module includes a multi-stage driver amplifier and a filter, the filter being located after any one of the multi-stage driver amplifiers in the radio frequency signal transmission direction; a power amplifier, the input end of the power amplifier is connected to the gain filtering module, and the output end of the power amplifier is connected to the transmission port of the transmission link; the driver amplifier located after the filter in the radio frequency signal transmission direction in the multi-stage driver amplifier is used as a collaborative amplifier, and the collaborative amplifier and the power amplifier work together in a linear working mode; wherein, the linear working mode is a working mode that emphasizes linearity.

[0037] Specifically, the transmitting link includes a gain filtering module 100 and a power amplifier 200. Among them, the input end of the gain filtering module 100 is connected to the signal processing module to receive the radio frequency signal output by the signal processing module. The signal processing module can be a module that acquires and processes the radio frequency signal to be transmitted. The input end of the power amplifier 200 is connected to the output end of the gain filtering module 100 to receive the radio frequency signal that has been power-amplified by the gain filtering module 100. The output end of the power amplifier 200 is connected to the transmitting port 300 of the transmitting link to transmit the further power-amplified radio frequency signal outward from the transmitting port 300.

[0038] Furthermore, the gain filtering module 100 includes a multi-stage driver amplifier 110 and a filter 120. The filter 120 is located after any stage of the driver amplifier 110 in the multi-stage driver amplifier 110 in the radio frequency signal transmission direction, that is, there is at least one stage of driver amplifier 110 before the filter 120 in the radio frequency signal transmission direction, and the number of stages of any stage of the driver amplifier 110 can be determined according to the power efficiency requirement and clutter requirement of the transmitting link for the communication system. The type of the filter 120 can be an acoustic filter or an electrical filter, etc. The acoustic filter includes but is not limited to surface acoustic wave filter (SAW), bulk acoustic wave filter (BAW), and thin film bulk acoustic resonator (FBAR), etc. The electrical filter includes but is not limited to integrated passive device (IPD), low temperature co-fired ceramic (LTCC), and distributed SMD network, etc. In the multi-stage driver amplifier 110, the input end of the first stage of the driver amplifier 110 along the radio frequency signal transmission direction is used as the input end of the gain filtering module 100 to be connected to the signal processing module.

[0039] It should be noted that the multi-stage driver amplifier 110 in the gain filtering module 100 is used to power-amplify the radio frequency signal to be transmitted so that the power level of the radio frequency signal meets the requirements of the power amplifier 200. However, various noises will inevitably be introduced during the operation of the driver amplifier, and at the same time as the radio frequency signal is power-amplified, the above-mentioned various noises will also be amplified by the driver amplifier, resulting in the radio frequency signal being affected by the noise. In this application, by arranging the filter 120 after any stage of the driver amplifier 110 in the multi-stage driver amplifier 110, the radio frequency signal output by the driver amplifier 110 before the filter 120 is filtered by the filter 120 to eliminate the clutter, noise, and interference components introduced by these driver amplifiers 110 in the radio frequency signal, thereby improving the linearity of the radio frequency signal and ensuring that the radio frequency signal meets the cleanliness requirements. Compared with the traditional transmitting link, the transmitting link provided in this application has an improvement of about 2 dB in the linearity index.

[0040] In some embodiments, the number of stages of the driver amplifier 110 before the filter 120 in the radio frequency signal transmission direction is less than the total number of stages of the multi-stage driver amplifier 110 in the gain filtering module 100. At this time, a driver amplifier 110 is also provided after the filter 120 in the radio frequency signal transmission direction. These driver amplifiers 110 located after the filter 120 in the radio frequency signal transmission direction serve as the cooperative amplifier 111. In this embodiment, the output end of the last-stage cooperative amplifier 111 along the radio frequency signal transmission direction is used as the output end of the gain filtering module 100 to be connected to the power amplifier 200.

[0041] Further, in the radio frequency signal transmission direction, the power amplifier 200 is connected between the gain filtering module 100 and the transmission port 300 of the transmission link, and is used to further amplify the power of the radio frequency signal so that the power of the radio frequency signal meets the requirements of signal transmission.

[0042] It should be noted that the radio frequency signal output by the power amplifier in the traditional transmission link also passes through a filter, and the filter will cause a certain degree of power loss to the radio frequency signal during filtering. This power loss can be a fixed loss proportional to the power of the radio frequency signal. The radio frequency signal passing through the power amplifier has a high power, and such a radio frequency signal will cause a high power loss when passing through the filter, which greatly limits the power efficiency of the transmission link. In the present application, the filter 120 is placed in front of the power amplifier 200, so that the radio frequency signal can be input into the filter 120 under a low power condition, effectively suppressing the power loss caused by the filter 120 to the radio frequency signal. At the same time, the output end of the power amplifier 200 is directly connected to the transmission port 300 of the transmission link, so that the radio frequency signal output by the power amplifier 200 can be directly transmitted by the transmission port 300, reducing the power loss suffered by the radio frequency signal in the transmission link and improving the power efficiency of the transmission link. Compared with the traditional transmission link, the transmission link provided in the present application has an improvement in power efficiency of about 3% to 5%.

[0043] Further, the cooperative amplifier 111 and the power amplifier 200 in the transmission link cooperate in a linear operating mode, where the linear operating mode is an operating mode that emphasizes linearity, so that the radio frequency signal can be linearly amplified when passing through the cooperative amplifier 111 and the power amplifier 200, and no significant distortion will occur, thereby ensuring that the radio frequency signal still has high linearity and cleanliness after passing through the filter 120. Exemplarily, the linear operating mode can be the Class-A mode. The Class-A mode has high linearity and generates less harmonics and intermodulation, and is suitable for broadband high-speed radio frequency communication technologies such as 4G, 5G, WiFi, and WiGig.

[0044] It can be understood that the output end of the power amplifier 200 in the present application is directly connected to the transmitting port 300 of the transmitting link, that is, there are no other components after the filter 120 that can filter the clutter generated in the transmitting link. Therefore, by making the cooperative amplifier 111 and the power amplifier 200 after the filter 120 work cooperatively in a working mode with higher linearity, the nonlinear distortion and clutter introduced into the transmitting link after the filter 120 are reduced, ensuring the signal quality of the radio frequency signal.

[0045] For the transmitting link provided in this embodiment, the filter is arranged after any stage of the multi-stage driving amplifier and before the power amplifier, and the cooperative amplifier and the power amplifier after the filter work cooperatively in a linear working mode, which not only reduces the power loss caused by the filter to the transmitting link and improves the power efficiency of the transmitting link, but also ensures that the radio frequency signal after the filter can still have a high linearity through the cooperative work between the amplifiers, further improving the radio frequency signal quality of the transmitting link.

[0046] Compared with the related art, in the present application, by placing the filter in front of the power amplifier, the fixed proportion loss brought by the filter is loaded on the radio frequency signal with smaller power, reducing the power loss of the radio frequency signal and effectively improving the power efficiency of the transmitting link; at the same time, the present application also uses the filter to eliminate the clutter generated by the driving amplifier, effectively improving the cleanliness of the radio frequency signal.

[0047] As an embodiment of the present application, the multi-stage driving amplifiers are connected in sequence, and the output end of the last stage driving amplifier in the multi-stage driving amplifiers along the radio frequency signal transmission direction serves as the output end of the gain filtering module; the filter is located after any stage of the multi-stage driving amplifiers in the radio frequency signal transmission direction, the output end of any stage of the driving amplifier is connected to the input end of the filter, and the output end of the filter is connected to the input end of the next stage driving amplifier after any stage of the driving amplifier.

[0048] Refer to Figure 3 As shown, in this embodiment, the number of the multi-stage driving amplifiers 110 can be two or more, and the multi-stage driving amplifiers 110 are connected in sequence along the radio frequency signal transmission direction. Figure 3In this context, n represents the total number of stages of the multi-stage driver amplifier 110. For any stage of the driver amplifier 110 other than the first stage and the last stage of the driver amplifier 110 along the RF signal transmission direction, its input terminal is connected to the output terminal of the previous stage of the driver amplifier 110, and its output terminal is connected to the input terminal of the next stage of the driver amplifier 110. In the multi-stage driver amplifier 110, the input terminal of the first stage of the driver amplifier 110 along the RF signal transmission direction serves as the input terminal of the gain filtering module 100, and the output terminal of the last stage of the driver amplifier 110 along the RF signal transmission direction serves as the output terminal of the gain filtering module 100.

[0049] Furthermore, in the gain filtering module 100, the filter 120 is located after any stage of the driver amplifier 110 in the multi-stage driver amplifier 110 in the RF signal transmission direction. The output terminal of this stage of the driver amplifier 110 is connected to the input terminal of the filter 120, and the output terminal of the filter 120 is connected to the input terminal of the next stage of the driver amplifier 110 after this stage of the driver amplifier 110. Figure 3 In this context, m represents the number of stages of this stage of the driver amplifier 110, m + 1 represents the number of stages of the next stage of the driver amplifier 110 after this stage of the driver amplifier 110, and m + 1 does not exceed n.

[0050] It can be understood that in the gain filtering module 100 of this embodiment, the RF signal to be transmitted enters the gain filtering module 100 from the input terminal of the gain filtering module 100, that is, the input terminal of the first stage of the driver amplifier 110 along the RF signal transmission direction, and is sequentially power-amplified by the multi-stage driver amplifier 110 before the filter 120. The power-amplified RF signal is output from the output terminal of the m-th stage of the driver amplifier 110 to the filter 120, and the filter 120 performs signal filtering on the RF signal to eliminate clutter, noise, interference components, etc. of the RF signal, and is output from the output terminal of the filter 120 to the (m + 1)-th stage of the driver amplifier 110. The filtered RF signal is sequentially power-amplified by the multi-stage driver amplifier 110 after the filter 120 to obtain the RF signal that has completed gain amplification and is output from the output terminal of the gain filtering module 100, that is, the output terminal of the last stage of the driver amplifier 110 along the RF signal transmission direction, and enters the power amplifier 200.

[0051] As an embodiment of the present application, the driver amplifier located before the filter in the multi-stage driver amplifier in the RF signal transmission direction serves as an efficiency amplifier, and the operating mode of the efficiency amplifier is a balanced operating mode; wherein, the balanced operating mode is an operating mode that takes into account both linearity and power efficiency.

[0052] Specifically, as Figure 3In the shown transmission link, the collaborative amplifier 111 and the power amplifier 200 work collaboratively in a linear operating mode, that is, the (m + 1)-th stage driver amplifier 110 to the n-th stage driver amplifier 110 and the power amplifier 200 along the radio frequency signal transmission direction all work in a linear operating mode, so that the radio frequency signal can be linearly amplified when passing through the collaborative amplifier 111 and the power amplifier 200, and no significant distortion occurs, thereby ensuring that the radio frequency signal still has high linearity and cleanliness after the filter 120.

[0053] Furthermore, as Figure 3 shown in the transmission link, among the multi-stage driver amplifiers 110, the driver amplifier 110 located before the filter 120 in the radio frequency signal transmission direction serves as the efficiency amplifier 112, that is, the first-stage driver amplifier 110 to the m-th stage driver amplifier 110 along the radio frequency signal transmission direction are all efficiency amplifiers 112. The efficiency amplifiers 112 all work in a balanced operating mode, and the balanced operating mode is an operating mode that takes into account both linearity and power efficiency, so that while the radio frequency signal is linearly amplified, a certain power efficiency is ensured, reducing the power loss suffered by the radio frequency signal when passing through the efficiency amplifier 112 and improving the power efficiency of the transmission link.

[0054] Exemplarily, the balanced operating mode can be the Class-AB mode. The Class-AB mode has higher power efficiency compared to the Class-A mode and also retains good linearity, but the linearity of the Class-AB mode is lower than that of the Class-A mode. Therefore, a certain amount of nonlinear distortion and interference such as clutter will be introduced when the radio frequency signal passes through the efficiency amplifier 112, and these interferences can be eliminated by signal filtering through the filter 120 connected after the efficiency amplifier 112.

[0055] As an embodiment of the present application, the multi-stage driver amplifiers are connected end to end in sequence. The output end of the last-stage driver amplifier along the radio frequency signal transmission direction in the multi-stage driver amplifiers is connected to the input end of the filter, and the output end of the filter serves as the output end of the gain filtering module.

[0056] Referring to Figure 4 shown, in this embodiment, the number of the multi-stage driver amplifiers 110 can be two or more, and the multi-stage driver amplifiers 110 are connected end to end in sequence along the radio frequency signal transmission direction. Figure 4Here, n represents the total number of stages of the multi-stage driver amplifier 110. For any stage of the driver amplifier 110 other than the first stage and the last stage of the driver amplifier 110 along the RF signal transmission direction, its input terminal is connected to the output terminal of the previous stage of the driver amplifier 110, and its output terminal is connected to the input terminal of the next stage of the driver amplifier 110. In the multi-stage driver amplifier 110, the input terminal of the first stage of the driver amplifier 110 along the RF signal transmission direction serves as the input terminal of the gain filtering module 100.

[0057] Furthermore, in the gain filtering module 100, the filter 120 is disposed after the last stage of the driver amplifier 110 along the RF signal transmission direction in the multi-stage driver amplifier 110. The output terminal of the last stage of the driver amplifier 110 is connected to the input terminal of the filter 120, and the output terminal of the filter 120 serves as the output terminal of the gain filtering module 100. The filter 120 is used to filter the RF signal output by the multi-stage driver amplifier 110 to eliminate clutter, noise, interference components, etc. introduced by these driver amplifiers 110 in the RF signal, thereby improving the linearity of the RF signal and ensuring that the RF signal meets the cleanliness requirements.

[0058] It can be understood that, compared with the Figure 3 illustrated embodiment, since there are more stages of the driver amplifier 110 before the filter 120 in the RF signal transmission direction, the cleanliness of the RF signal output by the gain filtering module 100 in this embodiment is higher than that of the RF signal output by the gain filtering module 100 in the Figure 3 illustrated embodiment. However, in this embodiment, the RF signal entering the filter 120 has been power-amplified by all the multi-stage driver amplifiers 110 and has a relatively high power. Therefore, compared with the Figure 3 illustrated embodiment, the RF signal in this embodiment will generate a greater power loss when passing through the filter 120, which to a certain extent affects the power efficiency of the transmission link.

[0059] In some embodiments, such as Figure 4 illustrated, the number of stages of the multi-stage driver amplifier 110 in the transmission link can also be one. At this time, the filter 120 eliminates the interference introduced by a single driver amplifier 110 in the RF signal.

[0060] As an embodiment of the present application, the operating modes of the multi-stage driver amplifiers are all balanced operating modes; among them, the balanced operating mode is an operating mode that takes into account both linearity and power efficiency.

[0061] Specifically, in this embodiment, the multi-stage driver amplifiers 110 are all disposed before the filter 120. Therefore, the multi-stage driver amplifiers 110 can all serve as efficiency amplifiers 112 and operate in a balanced mode, enabling the RF signal to be linearly amplified while ensuring a certain power efficiency, reducing the power loss suffered by the RF signal when passing through the efficiency amplifier 112, and improving the power efficiency of the transmission link.

[0062] Furthermore, since all the driver amplifiers 110 in this embodiment are disposed before the filter 120, there is no co-filter 120 in the transmission link, and only the power amplifier 200 operates in a linear mode in the transmission link, ensuring that the RF signal still has high linearity and cleanliness after the filter 120.

[0063] As an embodiment of the present application, the power amplifier is located after the filter in the RF signal transmission direction and is used to amplify the power of the RF signal after passing through the filter to reduce the power loss of the transmission link.

[0064] It should be noted that the RF signal output by the power amplifier in the traditional transmission link will also pass through the filter, and the filter will cause a certain degree of power loss to the RF signal during filtering. This power loss can be a fixed loss proportional to the power magnitude of the RF signal. The RF signal passing through the power amplifier has a high power, and such an RF signal will cause a high power loss when passing through the filter, greatly limiting the power efficiency of the transmission link.

[0065] Specifically, in this embodiment, the power amplifier 200 is disposed after the gain filtering module 100 in the RF signal transmission direction, and the gain filtering module 100 includes the filter 120. Therefore, the power amplifier 200 is located after the filter 120 in the RF signal transmission direction, and the power amplifier 200 is directly connected to the transmission port 300 of the transmission link. By placing the filter 120 in front of the power amplifier 200, the RF signal can be input into the filter 120 at a lower power, effectively suppressing the power loss caused by the filter 120 to the RF signal. At the same time, the output end of the power amplifier 200 is directly connected to the transmission port 300 of the transmission link, enabling the RF signal output by the power amplifier 200 to be directly transmitted by the transmission port 300, reducing the power loss suffered by the RF signal in the transmission link, and improving the power efficiency of the transmission link.

[0066] As an embodiment of the present application, the filter is located after any stage of the driver amplifier in the RF signal transmission direction and is used to filter the harmonics and intermodulation interference generated by the driver amplifier located before the filter in the RF signal transmission direction to improve the signal quality of the transmission link.

[0067] It should be noted that during the operation of the driver amplifier, various noises will inevitably be introduced. Moreover, when amplifying the power of the radio frequency signal, the above-mentioned various noises will also be amplified, resulting in the radio frequency signal being affected by the noises. In the traditional transmission link, since the filter is located after the power amplifier, the noises introduced by the driver amplifier will be further amplified in the power amplifier, seriously affecting the signal quality of the radio frequency signal.

[0068] Specifically, in this embodiment, by arranging the filter 120 after any one of the multi-stage driver amplifiers 110 in the multi-stage driver amplifier 110, the radio frequency signal output by the driver amplifier 110 before the filter 120 is filtered by the filter 120 to eliminate the clutter, noises, interference components, etc. introduced by these driver amplifiers 110 in the radio frequency signal, thereby improving the linearity of the radio frequency signal and ensuring that the radio frequency signal meets the cleanliness requirements. It can be understood that the position where the filter 120 is arranged can be determined according to the power efficiency requirements and clutter requirements of the communication system for the transmission link.

[0069] Furthermore, the collaborative amplifier 111 and the power amplifier 200 in the transmission link work together in a linear operating mode, where the linear operating mode is an operating mode that emphasizes linearity, such that the radio frequency signal can be linearly amplified when passing through the collaborative amplifier 111 and the power amplifier 200, and there will be no significant distortion, thereby ensuring that the radio frequency signal still has high linearity and cleanliness after the filter 120 and ensuring the signal quality of the radio frequency signal.

[0070] As an embodiment of the present application, the transmitting port includes an antenna switch and a transmitting antenna connected in sequence, and the input end of the antenna switch is connected to the output end of the power amplifier.

[0071] Specifically, the transmitting port 300 includes an antenna switch and a transmitting antenna. One end of the antenna switch is used as the input end of the transmitting port 300 and is connected to the output end of the power amplifier 200, and the other end of the antenna switch is connected to the transmitting antenna. The antenna switch is used to control the opening and closing of the transmission link, or to control the transmission path of the radio frequency signal in the case of multiple parallel transmission links. The transmitting antenna receives the radio frequency signal and converts the radio frequency signal into a mode that can be transmitted, thereby transmitting and propagating the radio frequency signal from the transmission link.

[0072] Refer to Figure 5 As shown, the present application also provides a radio frequency front-end signal link, including a modem, a radio frequency transceiver, a receiving link, and a transmitting link as described in any one of the above embodiments. It can be understood that structures such as the modem and the radio frequency transceiver can be used as signal processing modules to output the radio frequency signal to be transmitted to the transmitting link.

[0073] The present application also provides a radio frequency front-end module, including the radio frequency front-end signal link described in any one of the above embodiments.

[0074] It should also be noted that the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, commodity or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, commodity or device including the said element.

[0075] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and the differences between each embodiment and other embodiments are emphasized. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiment.

[0076] The above are only the embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

[0077] Although the embodiments of the present application are described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A transmitting link, characterized in that, The transmitting link includes: A gain filtering module, which includes a multi-stage driver amplifier and a filter. The filter is located after any stage of the multi-stage driver amplifier in the RF signal transmission direction; A power amplifier, whose input end is connected to the gain filtering module, and whose output end is connected to the transmitting port of the transmitting link; The driver amplifier of the multi-stage driver amplifier that is located after the filter in the RF signal transmission direction serves as a collaborative amplifier, and the collaborative amplifier works with the power amplifier in a linear operating mode; wherein, the linear operating mode is an operating mode that emphasizes linearity.

2. The transmission link according to claim 1, wherein The multi-stage driver amplifiers are connected in sequence, and the output end of the last stage driver amplifier in the RF signal transmission direction serves as the output end of the gain filtering module; The filter is located after any stage of the multi-stage driver amplifier in the RF signal transmission direction. The output end of any stage of the driver amplifier is connected to the input end of the filter, and the output end of the filter is connected to the input end of the next stage driver amplifier after any stage of the driver amplifier.

3. The transmitting link according to claim 2, wherein The driver amplifier of the multi-stage driver amplifier that is located before the filter in the RF signal transmission direction serves as an efficiency amplifier, and the operating mode of the efficiency amplifier is a balanced operating mode; wherein, the balanced operating mode is an operating mode that takes into account both linearity and power efficiency.

4. The transmitting link according to claim 1, characterized in that, The multi-stage driver amplifiers are connected end to end in sequence. The output end of the last stage driver amplifier in the RF signal transmission direction is connected to the input end of the filter, and the output end of the filter serves as the output end of the gain filtering module.

5. The transmitting link according to claim 4, characterized in that The operating modes of the multi-stage driver amplifiers are all balanced operating modes; wherein, the balanced operating mode is an operating mode that takes into account both linearity and power efficiency.

6. The transmission link according to claim 1, wherein The power amplifier is located after the filter in the RF signal transmission direction and is used to amplify the power of the RF signal after passing through the filter to reduce the power loss of the transmitting link.

7. The transmitting link according to claim 1, wherein The filter is located after any stage of the driver amplifier in the RF signal transmission direction and is used to filter the harmonics and intermodulation interference generated by the driver amplifier located before the filter in the RF signal transmission direction to improve the signal quality of the transmitting link.

8. The transmitting link according to claim 1, characterized in that The transmitting port includes an antenna switch and a transmitting antenna connected in sequence, and the input end of the antenna switch is connected to the output end of the power amplifier.

9. A radio frequency front-end signal link, characterized in that, It includes a modem, a radio frequency transceiver, a receiving link, and the transmitting link according to any one of claims 1 to 8.

10. A radio frequency front-end module, characterized in that, It includes the radio frequency front-end signal link according to claim 9.

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