CN215498956U - Radio frequency front-end circuit and electronic equipment - Google Patents

Abstract

The utility model discloses a radio frequency front-end circuit and electronic equipment, wherein the radio frequency front-end circuit comprises a transceiving module, a first radio frequency switch, three second radio frequency switches and four antennas; the receiving and transmitting module is connected with the first radio frequency switch, the first radio frequency switch is connected with one of the antennas and is respectively connected with the other three antennas through the three second radio frequency switches; the receiving and transmitting module is used for outputting a transmitting signal to the first radio frequency switch; the first radio frequency switch is used for transmitting the transmitting signals to the four antennas in turn; according to the utility model, the first radio frequency switch and the second radio frequency switch are arranged outside the transceiving module, and compared with the arrangement of the first radio frequency switch and the second radio frequency switch in the transceiving module, the external first radio frequency switch and the external second radio frequency switch are used, so that the cost is effectively saved; and can directly be connected with external radio frequency switch when piling up other modules, and need not detour to can pile up other modules according to the position that the antenna presented the point in a flexible way.

Description

Radio frequency front-end circuit and electronic equipment

Technical Field

The present invention relates to the field of mobile communications technologies, and in particular, to a radio frequency front end circuit and an electronic device.

Background

The SRS (Sounding reference signal) is an uplink reference channel of 5G NR, and may perform channel quality detection and evaluation, wave speed management, and the like. The system receives and processes the SRS of all UEs (user equipments), and measures SINR (Signal to Interference plus noise ratio) of each subcarrier of each UE in a PUSCH (Physical Uplink Shared Channel) frequency band, RSRP (Reference Signal Received Power: Received Power of downlink Reference Signal), and the like. The receiving path of the mobile phone is mainly used as the transmitting path of the SRS reference signal.

The SRS mechanism is that a base station estimates channel information and resource requirements through a preset mechanism by means of various quantization algorithms after measurement of a terminal, and reports the channel information and the resource requirements to the base station; and the SRS directly reports the channel information to the base station by using the channel reciprocity, so that the SRS mode is more accurate obviously. Meanwhile, in the SRS mode, the more the number of antennas that can participate in transmitting the reference signal, the more accurate the channel estimation is, and the higher the download rate that can be obtained is.

In the design of mobile phone terminal clients in the market at present, 1T2R and 1T4R are the mainstream design of SRS, where 1T2R refers to the round transmission of a single transmission signal through 2 receiving channels, and 1T4R refers to the round transmission of a transmission signal through four receiving channels. Through comparison of download speeds in a real network, the throughput of 1T2R is improved by 20-30% compared with that of the device without SRS transmission (the throughput refers to the maximum rate which can be accepted by the device under the condition of no frame loss), and the throughput of 1T4R is improved by 20-30% compared with that of 1T 2R; however, in the current radio frequency architecture of 1T4R, an SRS switch (the SRS switch has the same shape as a common radio frequency switch, but supports the SRS function, and the switching time of the switch is less than 2 us.) is built in an integrated module supporting the 5G band, which increases the cost of the integrated module.

Thus, the prior art has yet to be improved and enhanced.

SUMMERY OF THE UTILITY MODEL

In view of the foregoing disadvantages of the prior art, an object of the present invention is to provide a radio frequency front end circuit and an electronic device, in which the first radio frequency switch and the second radio frequency switch are both disposed outside the transceiver module, and compared with the case where the first radio frequency switch and the second radio frequency switch are disposed inside the transceiver module, the cost can be effectively saved by using the external first radio frequency switch and the external second radio frequency switch; and can directly be connected with external radio frequency switch when piling up other modules, and need not detour to can be according to the other modules of piling up of the position flexibility of antenna feed point, fine assurance pile up the flexibility of design.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a radio frequency front-end circuit comprises a transceiving module, a first radio frequency switch, three second radio frequency switches and four antennas; the receiving and transmitting module is connected with the first radio frequency switch, the first radio frequency switch is connected with one of the antennas, and the first radio frequency switch is respectively connected with the other three antennas through the three second radio frequency switches; the receiving and transmitting module is used for outputting a transmitting signal to the first radio frequency switch; the first radio frequency switch is used for transmitting the transmitting signals to the four antennas in turn.

In the radio frequency front-end circuit, the radio frequency front-end circuit further comprises three receiving modules, and the three receiving modules are connected with the three second radio frequency switches in a one-to-one correspondence manner; the receiving module is used for receiving the radio frequency signals received by the antenna through the corresponding second radio frequency switch.

In the radio frequency front-end circuit, the first radio frequency switch includes a first port, a second port, a third port, a fourth port and a fifth port; the first port, the third port and the fourth port are respectively and correspondingly connected with the three second radio frequency switches, the second port is connected with one of the antennas, and the fifth port is connected with the transceiving module.

Each second rf switch in the rf front-end circuit includes a sixth port, a seventh port, and an eighth port; the sixth port is connected with the corresponding receiving module, the seventh port is connected with the first radio frequency switch, and the eighth port is connected with the corresponding antenna.

In the radio frequency front end circuit, the transceiver module comprises an antenna port, and the antenna port is connected with a fifth port of the first radio frequency switch.

In the radio frequency front-end circuit, the transceiver module further comprises a first filter and a power amplifier; the power amplifier is connected with the first filter and used for amplifying the transmitting signal and outputting the amplified transmitting signal to the first filter; the first filter is used for filtering the amplified transmission signal and outputting the filtered transmission signal to the first radio frequency switch through the antenna port.

In the radio frequency front-end circuit, each receiving module comprises a second filter and a low noise amplifier; the second filter is connected with the second radio frequency switch and the low noise amplifier, and is configured to filter the radio frequency signal transmitted by the second radio frequency switch and output the radio frequency signal to the low noise amplifier; the low noise amplifier is used for amplifying the radio frequency signal.

An electronic device comprising a radio frequency front end circuit as described above.

Compared with the prior art, the radio frequency front-end circuit and the electronic equipment provided by the utility model comprise a transceiving module, a first radio frequency switch, three second radio frequency switches and four antennas; the receiving and transmitting module is connected with the first radio frequency switch, the first radio frequency switch is connected with one of the antennas, and the first radio frequency switch is respectively connected with the other three antennas through the three second radio frequency switches; the receiving and transmitting module is used for outputting a transmitting signal to the first radio frequency switch; the first radio frequency switch is used for transmitting the transmitting signals to the four antennas in turn; according to the utility model, the first radio frequency switch and the second radio frequency switch are arranged outside the transceiving module, and compared with the arrangement of the first radio frequency switch and the second radio frequency switch in the transceiving module, the external first radio frequency switch and the external second radio frequency switch are used, so that the cost is effectively saved; and can directly be connected with external radio frequency switch when piling up other modules, and need not detour to can pile up other modules according to the position that the antenna presented the point in a flexible way.

Drawings

FIG. 1 is a schematic diagram of the antenna form and features of the SRS transponder provided by the present invention;

fig. 2 is a schematic diagram of a first embodiment of an rf front-end circuit according to the present invention;

fig. 3 is a schematic diagram of a second embodiment of an rf front-end circuit according to the present invention;

fig. 4 is a block diagram illustrating a third embodiment of an rf front-end circuit according to the present invention;

fig. 5 is a schematic diagram of a radio frequency front-end circuit according to a third embodiment of the present invention.

Reference numerals: 100: a transceiver module; 110: a first filter; 120: a power amplifier; 200: a first radio frequency switch; 300: a second radio frequency switch; 400: an antenna; 500: a receiving module; 510: a second filter; 520: a low noise amplifier.

Detailed Description

The utility model provides a radio frequency front-end circuit and electronic equipment, wherein a first radio frequency switch and a second radio frequency switch are arranged outside a transceiving module, so that the cost can be effectively saved compared with the situation that the first radio frequency switch and the second radio frequency switch are arranged inside the transceiving module; when the stacking design is carried out, the external radio frequency switch is directly connected with other modules without bypassing, so that other modules can be flexibly stacked according to the position of the antenna feed point.

In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The following description of the embodiments will further explain the present invention by referring to the figures.

Referring to fig. 1, 1T1R shows that SRS information is fed back to a base station only by being fixed on one antenna, that is, SRS transmission is not supported, and the SRS information is a mode commonly used by an NSA (Non-standard: Non-independent networking) terminal. 1T4R shows that the terminal transmits SRS signals on 4 antennas in turns, but only selects 1 antenna at a time for transmission, which is a mode often used by SA (standard: independent networking) terminals; because the throughput of 1T4R is obviously improved compared with the throughput of 1T2R, the subjective experience of the user can be effectively optimized.

The SRS forwarding scheme of 1T4R is described below by using specific exemplary embodiments, and it should be noted that the following embodiments are only used for explaining the technical solution of the present invention, and are not specifically limited: referring to fig. 2, in the first embodiment of the present invention, a TDD (Test-drive Development) N77/79 module is mainly used to integrate an SRS switch for transmitting in turn, and an SRS signal is sequentially switched to four receiving antennas for transmitting in turn after passing through the SRS switch. The rf front-end circuit design in the figure includes four large modular devices: 1N 77TRX module and 3N 77RX modules with built-in SRS switches; the N77TRX module is an integrated module supporting a 5G N77 frequency band, and has a receiving function and a transmitting function inside; the N77RX module is a module with receive only functionality. The round sending of the SRS signals refers to that the SRS signals are sequentially output to four different receiving antennas from a built-in power amplifier of the chip S55257-12, so that the round sending of the SRS signals of 1T4R is realized.

According to the scheme, the built-in SRS switch of the N77TRX is directly used, an external SRS switch is not needed, the occupied PCB area can be reduced, however, SP3T and 3P4T switches are integrated in the scheme, the cost is increased on the contrary, and the whole price of the used N77TRX module is expensive; moreover, in the actual antenna layout, four antennas cannot be stacked at the same position of the mobile phone, and three N77 receiving modules all pass through the N77TRX module and then can be connected to the antenna feed point, so that the routing of the whole receiving path can be routed around many loops to reach the antennas, thereby greatly affecting the sensitivity performance of the N77 three-way receiving path.

Referring to fig. 3, a second embodiment of the present invention is a highly integrated solution, in which the module of the first embodiment is an integrated 2RX + SRS switch, and the module of the second embodiment is an integrated 1T2R + SRS switch. The direction of the SRS signals in this scheme is from the TRX module to antennas ANT0 and ANT1, and the other two sets of signals from the TRX module to the RX module to antennas ANT2 and ANT 3.

The scheme adopts high integration, thereby further optimizing the design space of the PCB. However, in the scheme, the modules of the TRX and the RX are internally integrated with the SRS switches with double input and multiple output, and the cost is not saved; furthermore, the stacked design of this solution is relatively flexible compared to the first embodiment, although the antennas ANT0 or ANT1 and ANT2 or ANT3 may be designed separately, the antennas ANT2 and ANT3 and the antennas ANT0 and ANT1 still have relatively high requirements for the antenna feed point design.

In summary, although the two schemes can reduce the occupied area of the PCB, the reduction effect is small, and the stacking design and the routing have great dependence on the antenna stacking, so that the common design is not available; and each group module of the N77 needs to bypass other modules to be connected with the antenna, so that the modules cannot be flexibly stacked according to the position of the antenna feed point, and the performance of transmission and all reception cannot be considered.

Referring to fig. 4, a radio frequency front end circuit is disclosed in a third embodiment of the present invention, and the radio frequency front end circuit includes a transceiver module 100, a first radio frequency switch 200, three second radio frequency switches 300, and four antennas 400; the transceiver module 100 is connected to the first rf switch 200, and the first rf switch 200 is connected to one of the antennas 400 and is connected to the other three antennas 400 through the three second rf switches 300; the transceiver module 100 is configured to output a transmission signal to the first rf switch 200; the first rf switch 200 is configured to transmit the transmitting signal to four antennas 400 in turn; according to the utility model, the first radio frequency switch 200 and the second radio frequency switch 300 are arranged outside the transceiving module 100, and compared with the arrangement of the first radio frequency switch and the second radio frequency switch in the transceiving module, the external first radio frequency switch and the external second radio frequency switch are used, and can be directly connected with the external radio frequency switch when other modules are stacked without bypassing, so that other modules can be flexibly stacked according to the position of an antenna feed point, and the flexibility of stacking design is well ensured.

Specifically, when the antenna 400 transmits a signal, the transceiver module 100 transmits the transmission signal to the external first rf switch 200, and at this time, the first rf switch 200 needs to be connected to the second rf switch 300, and the transmission signal is either output from the first rf switch 200 to the second rf switch 300, and then transmitted to the corresponding antenna 400 by the second rf switch 300; or the SRS is directly transmitted to the corresponding antenna 400 by the first rf switch 200, so that the polling can be sequentially performed from four ports of the first rf switch 200 to four different antennas 400 at different times, that is, the 1T4R SRS is transmitted through the external SRS switch; according to the utility model, the first radio frequency switch 200 and the second radio frequency switch 300 are arranged, the transmission signals are sequentially transmitted to the four antennas 400 in different time, the polling of the transmission signals on the four antennas 400 is completed, the multi-line sequential signal transmission is effectively realized, and the throughput is increased.

Further, referring to fig. 5, the rf front-end circuit further includes three receiving modules 500, the three receiving modules 500 are connected to the three second rf switches 300 in a one-to-one correspondence manner, and the receiving modules 500 are configured to receive the rf signals received by the antenna 400 through the corresponding second rf switches 300; in this embodiment, the three receiving modules 500 are denoted as T1, T2 and T3, respectively, wherein the receiving module T1 is connected to the second rf switch 300, the receiving module T2 is connected to the second rf switch 300, and the receiving module T3 is connected to the second rf switch 300; the receiving module 500 amplifies the radio frequency signal, so that the signal-to-noise ratio of the output signal is effectively improved; meanwhile, the SRS switch is not arranged inside the receiving module 500, so that the cost is further saved.

Further, the first radio frequency switch 200 includes a first port RF1, a second port RF2, a third port RF3, a fourth port RF4, and a fifth port RF 5; the first port RF1, the third port RF3 and the fourth port RF4 are respectively connected to three second RF switches 300, the second port RF2 is connected to one of the antennas 400, and the fifth port RF5 is connected to the transceiver module 100. Wherein, the first RF switch 200 is a SP4T (Single Pole 4 thread: Single Pole four Throw) switch, and the fifth port RF5 is a moving contact; the first port RF1, the second port RF2, the third port RF3, and the fourth port RF4 are stationary contacts.

Specifically, when the antenna 400 transmits a signal, the transceiver module 100 sends the transmission signal to the external first RF switch 200, and a moving contact of the first RF switch 200 may be sequentially connected to different stationary contacts, that is, the fifth port RF5 is sequentially connected to the first port RF1, the second port RF2, the third port RF3, or the fourth port RF4, so that the transmission signal may be transmitted to different antennas 400 in the next step, that is, the first RF switch 200 controls the transmission signal to be output through different channels, so that the SRS signal is effectively controlled to poll four different antennas 400, so as to complete the round sending of the SRS 1T 4R.

Further, each of the second radio frequency switches 300 includes a sixth port RF6, a seventh port RF7, and an eighth port RF 8; the sixth port RF6 is connected to the corresponding receiving module 500, the seventh port RF7 is connected to the first RF switch 200, and the eighth port RF8 is connected to the corresponding antenna 400.

The second rf switch 300 is an SPDT switch (Single Pole Double Throw), and in this embodiment, three second rf switches 300 are provided, which are respectively denoted as K1, K2, and K3; wherein the sixth port RF6 and seventh port RF7 are stationary contacts and the eighth port RF8 is a movable contact; the sixth port RF6 of the second RF switch K1 is connected to the receiving module T1, and the seventh port RF7 of the second RF switch K1 is connected to the first port RF1 of the first RF switch 200; a sixth port RF6 of the second RF switch K2 is connected to the receiving module T2, and a seventh port RF7 of the second RF switch K2 is connected to the third port RF3 of the first RF switch 200; the sixth port RF6 of the second RF switch K3 is connected to the receiving module T3, and the seventh port RF7 of the second RF switch K3 is connected to the fourth port RF4 of the first RF switch 200.

Specifically, when the antenna 400 transmits a signal, the transceiver module 100 sends the transmission signal to the external first RF switch 200, and the transmission signal is transmitted from the first RF switch 200 to the second RF switch K1, the second RF switch K2, or the second RF switch K3 through the seventh port RF7, and then transmitted to the corresponding antenna 400 through the second RF switch K1, the second RF switch K2, or the eighth port RF8 of the second RF switch K3, respectively; or directly transmitted to the corresponding antenna 400 by the first rf switch 200; the SPDT switch is matched with the SP4T switch in a switching manner, that is, when the seventh port RF7 of the SPDT switch is connected to the eighth port RF8 of the SPDT switch, the fifth port RF5 of the SP4T switch is matched to connect the first port RF1, the second port RF2, the third port RF3 or the fourth port RF4 of the SP4T switch in sequence, so that the signals are transmitted to different antennas 400 in sequence, different polling manners are formed, and the 1T4R SRS transmission is completed.

Further, the transceiver module 100 includes an antenna port ANT, and the antenna port ANT is connected to the fifth port RF5 of the first RF switch 200. The antenna port ANT is configured to output a transmission signal of the transceiver module to the first rf switch 200, so that the first rf switch 200 further switches the transmission signal to different antennas 400, thereby ensuring effective transmission of the transmission signal.

Further, the transceiver module 100 further includes a first filter 110 and a power amplifier 120; the power amplifier 120 is connected to the first filter 110, and configured to amplify the transmit signal and output the amplified transmit signal to the first filter 110; the first filter 110 is configured to filter the amplified transmission signal and output the filtered transmission signal to the first rf switch 200 through the antenna port.

Specifically, the power amplifier 120 performs power amplification on the transmission signal, and then transmits the transmission signal to the first filter 110, and the first filter 110 performs filtering processing on the transmission signal, and then the transmission signal is transmitted to the first rf switch 200 through the antenna port ANT by the first filter 110; by performing power amplification and filtering processing on the transmission signal through the power amplifier 110 and the first filter 120, respectively, the transmission signal is effectively enhanced, the signal source is stabilized, and the waveform of the transmission signal becomes smoother.

Further, each of the receiving modules 500 includes a second filter 510 and a low noise amplifier 520; the second filter 510 is connected to the sixth port RF6 of the second radio frequency switch 300 and the low noise amplifier 520, and is configured to filter the radio frequency signal transmitted by the second radio frequency switch 300 and output the filtered radio frequency signal to the low noise amplifier 520; the low noise amplifier 520 is configured to amplify the radio frequency signal.

Specifically, when the receiving module 500 receives a signal, the sixth port RF6 of the second RF switch 300 is connected to the eighth port RF8 of the second RF switch 300, and at this time, the received signal is transmitted from the antenna 400 to the second RF switch 300, and then transmitted to the second filter 510 through the sixth port RF6 of the second RF switch 300, and then the second filter 510 transmits the received signal to the low noise amplifier 520; the received signal is filtered and the noise of the received signal is reduced by the second filter 510 and the low noise amplifier 520, so that the interference of the amplifier to the received signal is effectively reduced, the signal-to-noise ratio of the received signal is improved, the voltage ripple coefficient of the received signal is reduced, and the waveform becomes smoother.

Four antennas 400, denoted as ANT1, ANT2, ANT3, and ANT4 in this embodiment; wherein each of the antennas 400 is connected to the eighth port RF8 of the second radio frequency switch 300 for transmitting or receiving signals. Specifically, when the antenna 400 transmits a signal, the eighth port RF8 of the second RF switch 300 is connected to the seventh port RF7 of the second RF switch 300, and at this time, the transceiver module 100 sends the transmission signal to the externally-arranged first RF switch 200, and the fifth port RF5 of the first RF switch 200 is connected to the first port RF1, the second port RF2, the third port RF3, or the fourth port RF4 of the first RF switch 200 in sequence, that is, the transmission signal is output to the second RF switch 300 from one of three ports (RF 1, RF3, and RF4 in the third embodiment) of the first RF switch 200, and is correspondingly transmitted to one of the three antennas 400 (ANT 1, ANT3, and ANT4 in the third embodiment); or directly transmitted from the last port (RF 2 in the third embodiment) of the first RF switch 200 to the corresponding last antenna 400 (ANT 2 in the third embodiment), so that the transmitting signal is transmitted from the first RF switch 200 to the antenna ANT1, the antenna ANT2, the antenna ANT3 or the antenna ANT4 in sequence, thereby completing the transmission of the signal; when the antenna 400 receives a signal, selecting any one of the antenna ANT1, the antenna ANT2, the antenna ANT3, and the antenna ANT4 as a receiving end, where the received signal is received by the antenna ANT1, the antenna ANT3, or the antenna ANT4, and then correspondingly transmitted to the receiving module T1, the receiving module T2, or the receiving module T3 through the second rf switch K1, the second rf switch K2, or the second rf switch K3; or the antenna ANT3 directly transmits the signal to the receiving module 100 through the first rf switch 200, thereby completing the signal reception. By arranging the plurality of antennas 400, the present invention not only can transmit signals to external devices by rotating and multiplexing the signals through the plurality of antennas 400, but also can select one of the plurality of antennas 400 to receive signals, thereby realizing the transmission or reception of SRS signals.

For better understanding of the present invention, the operation principle of the rf front-end circuit of the present invention is described in detail below with reference to fig. 4 and 5:

when the antenna 400 transmits a signal, the first RF switch 200 needs to be connected to the second RF switch 300, the transmitted signal is initially transmitted from the transmitter to the RF front-end circuit through the TX _ IN port of the transceiver module 100, the transmitted signal is amplified by the power amplifier 120 and filtered by the first filter 110, and then transmitted to the first RF switch 200 through the antenna port, and at this time, since the fifth port RF5 of the first RF switch 200 is sequentially connected to the first port RF1, the second port RF2, the third port RF3, or the fourth port RF4 of the first RF switch 200, four situations are possible: firstly, if the transmission signal is finally transmitted by the antenna ANT1, the fifth port RF5 is connected to the first port RF1, and at this time, the transceiver module 100 first transmits the transmission signal, and the transmission signal is transmitted from the antenna port to the first RF switch 200, then transmitted from the first port RF1 of the first RF switch 200 to the seventh port RF7, passes through the second RF switch K1, and then passes through the eighth port RF8 of the second RF switch K1 to the antenna ANT1, thereby completing the transmission of the signal; secondly, if the transmission signal is finally transmitted from the antenna ANT2, the fifth port RF5 is connected to the first port RF2, and at this time, the transceiver module 100 first transmits the transmission signal, and the transmission signal is transmitted to the first RF switch 200 from the antenna port, then output from the second port RF2 of the first RF switch 200, and then directly transmitted to the antenna ANT2, thereby completing the transmission of the signal; thirdly, if the transmission signal is finally transmitted from the antenna ANT3, the fifth port RF5 is connected to the third port RF3, and at this time, the transceiver module 100 first transmits the transmission signal, and the transmission signal is transmitted from the antenna port to the first RF switch 200, then transmitted from the third port RF3 of the first RF switch 200 to the seventh port RF7, passes through the second RF switch K2, and then passes through the eighth port RF8 of the second RF switch K2 to the antenna ANT3, thereby completing the transmission of the signal; fourthly, if the transmission signal is finally transmitted by the antenna ANT4, the fifth port RF5 is connected to the fourth port RF4, and at this time, the transceiver module 100 first transmits the transmission signal, and the transmission signal is transmitted from the antenna port to the first RF switch 200, then transmitted from the fourth port RF4 of the first RF switch 200 to the seventh port RF7, passes through the second RF switch K3, and then transmitted to the antenna ANT4 through the eighth port RF8 of the second RF switch K3, thereby completing the transmission of the signal; it can be seen that, by switching and matching the first radio frequency switch 200 and the second radio frequency switch 300, that is, when the seventh port RF7 of the second radio frequency switch 300 is connected to the eighth port RF8 thereof, the fifth port RF5 of the first radio frequency switch 200 is further matched to be sequentially connected to the first port RF1, the second port RF2, the third port RF3 or the fourth port RF4 of the first radio frequency switch 200, so that the signals are sequentially transmitted to the corresponding antenna ANT1, antenna ANT2, antenna ANT3 or antenna ANT4, thereby completing the polling of the transmission signals at the four antennas 400, that is, the external SRS switches of 1 SP4T and 3 SPDTs realize the round transmission of 1T4 SRS 4R.

When the antenna 400 receives a signal, selecting any one of the antenna ANT1, the antenna ANT2, the antenna ANT3 and the antenna ANT4 as a receiving end, where the received signal is received by either the antenna ANT1, the antenna ANT3 or the antenna ANT4, then correspondingly transmitted to the receiving module T1, the receiving module T2 or the receiving module T3 through the second rf switch K1, the second rf switch K2 or the second rf switch K3, and finally transmitted to the transceiver; or the signal is directly transmitted to the receiving module 100 through the antenna ANT3 via the first rf switch 200, and finally transmitted to the transceiver through the RX _ OUT port of the receiving module 100, so that the signal reception is completed, that is, the SRS signal reception of 1T1R is realized through the external SRS switches of 1 SP4T and 3 SPDTs.

Further, the utility model also provides an electronic device, which comprises the radio frequency front-end circuit, wherein the radio frequency front-end circuit comprises a transceiving module, a first radio frequency switch, three second radio frequency switches and four antennas; the receiving and transmitting module is connected with the first radio frequency switch, the first radio frequency switch is connected with one of the antennas, and the first radio frequency switch is respectively connected with the other three antennas through the three second radio frequency switches; the receiving and transmitting module is used for outputting a transmitting signal to the first radio frequency switch; the first radio frequency switch is used for transmitting the transmitting signals to the four antennas in turn.

According to the utility model, the first radio frequency switch 200 and the second radio frequency switch 300 are arranged outside the transceiving module 100, and compared with the arrangement of the first radio frequency switch 200 and the second radio frequency switch 300 in the transceiving module, the external first radio frequency switch 200 and the external second radio frequency switch 300 are used, and can be directly connected with the external radio frequency switch when other modules are stacked without winding, so that other modules can be flexibly stacked according to the position of an antenna feed point, and the flexibility of stacking design is well ensured.

Specifically, the electronic device realizes SRS round transmission of 1T4R through external SRS switches of 1 SP4T and 3 SPDTs, and the electronic device can transmit the SRS signals in round through four transmission channels, so that the throughput of information is effectively increased, and the user experience is greatly optimized; and set up three SPDT's SRS switch to when piling up other modules, the module that piles up can be through self antenna port lug connection to external switch, need not to wind other modules again, can give consideration to the performance of transmission and all receptions according to the nimble module that piles up in position that the antenna presented a little.

In summary, the radio frequency front-end circuit and the electronic device provided by the present invention include a transceiver module, a first radio frequency switch, three second radio frequency switches, and four antennas; the receiving and transmitting module is connected with the first radio frequency switch, the first radio frequency switch is connected with one of the antennas, and the first radio frequency switch is respectively connected with the other three antennas through the three second radio frequency switches; the receiving and transmitting module is used for outputting a transmitting signal to the first radio frequency switch; the first radio frequency switch is used for transmitting the transmitting signals to the four antennas in turn; according to the utility model, the first radio frequency switch and the second radio frequency switch are both arranged outside the transceiving module, so that the cost can be effectively saved compared with the situation that the first radio frequency switch and the second radio frequency switch are both arranged inside the transceiving module; when the stacking design is carried out, the external radio frequency switch is directly connected with other modules without bypassing, so that other modules can be flexibly stacked according to the position of the antenna feed point.

It should be understood that the technical solutions and the inventive concepts according to the present invention may be equally replaced or changed by those skilled in the art, and all such changes or substitutions should fall within the protection scope of the appended claims.

Claims (8)

1. A radio frequency front-end circuit is characterized by comprising a transceiving module, a first radio frequency switch, three second radio frequency switches and four antennas; the receiving and transmitting module is connected with the first radio frequency switch, the first radio frequency switch is connected with one of the antennas, and the first radio frequency switch is respectively connected with the other three antennas through the three second radio frequency switches; the receiving and transmitting module is used for outputting a transmitting signal to the first radio frequency switch; the first radio frequency switch is used for transmitting the transmitting signals to the four antennas in turn.

2. The rf front-end circuit according to claim 1, further comprising three receiving modules, wherein the three receiving modules are connected to the three second rf switches in a one-to-one correspondence; the receiving module is used for receiving the radio frequency signals received by the antenna through the corresponding second radio frequency switch.

3. The rf front-end circuit of claim 2, wherein the first rf switch comprises a first port, a second port, a third port, a fourth port, and a fifth port; the first port, the third port and the fourth port are respectively and correspondingly connected with the three second radio frequency switches, the second port is connected with one of the antennas, and the fifth port is connected with the transceiving module.

4. The rf front-end circuit according to claim 3, wherein each of the second rf switches comprises a sixth port, a seventh port, and an eighth port; the sixth port is connected with the corresponding receiving module, the seventh port is connected with the first radio frequency switch, and the eighth port is connected with the corresponding antenna.

5. The rf front-end circuit of claim 2, wherein the transceiver module comprises an antenna port, and wherein the antenna port is connected to a fifth port of the first rf switch.

6. The rf front-end circuit of claim 5, wherein the transceiver module further comprises a first filter and a power amplifier; the power amplifier is connected with the first filter and used for amplifying the transmitting signal and outputting the amplified transmitting signal to the first filter; the first filter is used for filtering the amplified transmission signal and outputting the filtered transmission signal to the first radio frequency switch through the antenna port.

7. The rf front-end circuit according to claim 2, wherein each of the receiving modules comprises a second filter and a low noise amplifier; the second filter is connected with the second radio frequency switch and the low noise amplifier, and is configured to filter the radio frequency signal transmitted by the second radio frequency switch and output the radio frequency signal to the low noise amplifier; the low noise amplifier is used for amplifying the radio frequency signal.

8. An electronic device comprising the radio frequency front end circuit of any one of claims 1 to 7.

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