CN112953573A - Radio frequency front end architecture - Google Patents
Radio frequency front end architecture Download PDFInfo
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- CN112953573A CN112953573A CN202110116578.3A CN202110116578A CN112953573A CN 112953573 A CN112953573 A CN 112953573A CN 202110116578 A CN202110116578 A CN 202110116578A CN 112953573 A CN112953573 A CN 112953573A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/006—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using switches for selecting the desired band
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0067—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
Abstract
The application discloses radio frequency front end architecture, radio frequency front end architecture includes: the system comprises a radio frequency transceiver, a signal processor, a path selection switch and a broadband filter; the radio frequency transceiver is used for receiving and/or transmitting signals; the signal processor is used for processing the signals; the path selection switch is used for selecting a first signal transmission path matched with the frequency range of the signal; the broadband filter is used for transmitting signals of at least two frequency bands. According to the method and the device, the broadband filter is shared by different signal paths, so that the radio frequency front end architecture has better working performance and the cost of the radio frequency front end architecture is reduced.
Description
Technical Field
The present application relates to the field of electronic technologies, and in particular, to a radio frequency front end architecture.
Background
With the development of communication technology, more and more frequency bands need to be supported by a mobile communication terminal, and the increase of the frequency bands brings about an increase of corresponding frequency band channels, that is, each frequency band channel needs to support a Power Amplifier (PA), a Low Noise Amplifier (LNA), a filter, a switch, and other devices, which increases the occupied area and the cost of each frequency band channel on a Printed Circuit Board (PCB). At present, a widely used technical scheme is to make active devices such as PA or LNA support multiple frequency bands simultaneously, but because the filter can only support specific frequency bands at present and corresponds to the frequency bands of each channel one to one, the area of the PCB board occupied by the radio frequency circuit and the cost of the radio frequency circuit cannot be effectively reduced, and the overall cost is still maintained at a higher level.
Disclosure of Invention
To solve the foregoing technical problem, an embodiment of the present application provides a radio frequency front end architecture.
The radio frequency front end architecture provided by the embodiment of the application comprises: the system comprises a radio frequency transceiver, a signal processor, a path selection switch and a broadband filter; wherein the content of the first and second substances,
the radio frequency transceiver is used for receiving and/or transmitting signals; the signal processor is used for processing the signals; the path selection switch is used for selecting a first signal transmission path matched with the frequency range of the signal; the broadband filter is used for transmitting signals of at least two frequency bands.
In an optional implementation manner of this application, the rf front-end architecture is characterized in that the first signal transmission path at least includes: a first signal transmission path transmitting a first frequency band and a first signal transmission path transmitting a second frequency band.
In the foregoing solution, the first signal transmission path for transmitting the first frequency band includes: a PA transmission path for performing power amplification on the signal of the first frequency band; and/or, LNA transmission path for low noise amplification of the signals of the first frequency band.
The first signal transmission path for transmitting the second frequency band includes: a PA transmission path for performing power amplification on the signal of the second frequency band; and/or, LNA transmission path for low noise amplification of the signals of the second frequency band.
In an optional implementation manner of this application, the rf front-end architecture is characterized in that the first signal transmission path at least includes: a transmission path for a received signal and a transmission path for a transmitted signal.
In the foregoing solution, the rf front-end architecture is characterized in that the path selection switch at least includes: a frequency band selection switch for transmitting signals and/or a frequency band selection switch for receiving signals.
In the above scheme, the method further comprises: the broadband filter is a duplexer for transmitting at least two frequency bands.
In an optional implementation manner of this application, the radio frequency front end architecture is characterized in that the radio frequency front end architecture further includes: the antenna is used for receiving a signal input from the outside of the radio frequency front-end architecture and transmitting the signal to the broadband filter; and/or the broadband filter is used for receiving the signal sent by the broadband filter and transmitting the signal to the outside of the radio frequency front end architecture.
In the foregoing solution, the rf front-end architecture is characterized in that, when there is a second signal transmission path that does not pass through the wideband filter, the rf front-end architecture may further include: an antenna switch for selecting the second signal transmission path.
In the technical solution of the embodiment of the present application, the radio frequency front end architecture includes: the system comprises a radio frequency transceiver, a signal processor, a path selection switch and a broadband filter; the radio frequency transceiver is used for receiving and/or transmitting signals; the signal processor is used for processing the signals; the path selection switch is used for selecting a first signal transmission path matched with the frequency range of the signal; the broadband filter is used for transmitting signals of at least two frequency bands. By sharing one broadband filter with different signal paths, the number of the broadband filters in the radio frequency front-end architecture can be reduced while the radio frequency front-end architecture has better working performance, the size of the radio frequency front-end architecture is reduced, the integration level of the radio frequency front-end architecture is improved, and the production cost of the radio frequency front-end architecture is reduced.
Drawings
FIG. 1 is a schematic diagram of a RF front end architecture in the related art;
fig. 2 is a first schematic diagram of an rf front end architecture according to an embodiment of the present disclosure;
FIG. 3 shows the characteristics of a band A filter, a band B filter, and a band A + B broadband filter;
fig. 4 is a schematic diagram of a radio frequency front end architecture according to an embodiment of the present application;
FIG. 5 shows the frequency range of the TX for band A, the frequency range of the TX for band B, and the frequency characteristics of the TX of the wideband duplexer for band A + B;
FIG. 6 is a frequency characteristic of a band A RX frequency range, a band B RX frequency range, and a band A + B broadband duplexer RX;
fig. 7 is a schematic diagram of a radio frequency front end architecture according to an embodiment of the present application;
fig. 8 is a schematic diagram of a radio frequency front end architecture according to an embodiment of the present application;
Detailed Description
A schematic diagram of a radio frequency front end architecture in the related art is shown in fig. 1, and includes a radio frequency transceiver, a signal path corresponding to a frequency band a, and a signal path corresponding to a frequency band B; wherein the content of the first and second substances,
the signal path corresponding to the frequency band A comprises: the PA is used for amplifying the power of the signal sent by the radio frequency transceiver; and/or, LNA for low noise amplification of the signal received by the antenna; a switch to select the PA path or LNA path, a band a filter for band a, and an antenna or antenna switch.
The signal path corresponding to the frequency band B includes: the PA is used for amplifying the power of the signal sent by the radio frequency transceiver; and/or, LNA for low noise amplification of the signal received by the antenna; a switch to select the PA path or the LNA path, a band B filter for band B, and an antenna or antenna switch.
In this embodiment, when the transmission signal is a frequency band a, the switch in the signal path corresponding to the frequency band a is closed, the switch in the signal path corresponding to the frequency band B is opened, and the frequency band output signal is transmitted by the transceiver, passes through the frequency band a _ PA and the frequency band a filter, and is finally transmitted to the outside by the antenna; the frequency band receiving signal is received by the antenna, passes through the frequency band A filter and the frequency band A _ LNA, and is finally received by the transceiver.
When the transmission signal is a frequency band B, a switch in a signal path corresponding to the frequency band B is closed, a switch in a signal path corresponding to the frequency band A is opened, and the frequency band output signal is transmitted by a transceiver, passes through a frequency band B _ PA transmission path and a frequency band B filter, and is finally transmitted to the outside by an antenna; the frequency band receiving signal is received by the antenna, passes through a frequency band B filter and a frequency band B _ LNA transmission path, and is finally received by the transceiver.
By adopting the embodiment, as the filter can only support a specific frequency band, different transmission paths need to be distinguished according to signals of different frequency bands, although the radio frequency performance is ensured, the corresponding frequency band paths in the embodiment are increased due to the increase of the frequency bands, so that the number of the filters required by the whole radio frequency circuit, the occupied PCB area and the radio frequency circuit cost are increased sharply.
In view of the problems in the foregoing implementation, an embodiment of the present application provides a radio frequency front end architecture, which introduces a filter including multiple frequency band ranges, as shown in fig. 2, where the radio frequency front end architecture is in a Time Division Duplex (TDD) frequency band, and includes: a radio frequency transceiver 21, a signal processor 22, a path selection switch 23 and a broadband filter 24.
Wherein, the transmission path connected to the radio frequency transceiver 21 is divided into a frequency band a transmission path for transmitting a frequency band a signal and a frequency band B transmission path for transmitting a frequency band B signal according to the transmission frequency band;
according to the signal transmission direction, the transmission path can be divided into a PA transmission path for sending out signals and a LNA transmission path for receiving signals.
In the above solution, in particular, in the transmission path connected to the rf transceiver 21,
the transmission path corresponding to the frequency band a signal may include: a frequency band a _ PA transmission path, or a frequency band a _ LNA transmission path, or a frequency band a _ PA transmission path and a frequency band a _ LNA transmission path;
the transmission path corresponding to the frequency band B signal may include: a band B _ PA transmission path, or a band B _ LNA transmission path, or a band B _ PA transmission path and a band B _ LNA transmission path.
In the above scheme, when the rf front end architecture operates, the path selection switch may be used to determine a transmission path according to a frequency band and a transceiving mode of a signal:
when a frequency band A signal is sent, the channel selection switch selects to switch on a frequency band A _ PA transmission channel, and the signal is sent out by the radio frequency transceiver 21, passes through a frequency band A _ PA signal processor and is filtered by the broadband filter 24;
when receiving a frequency band a signal, the path selection switch selects to switch on a frequency band a _ LNA transmission path, the signal is filtered by the wideband filter 24, passes through a frequency band a _ LNA signal processor, and is finally received by the radio frequency transceiver 21;
when a frequency band B signal is sent, the channel selection switch selects and connects a frequency band B _ PA transmission channel, and the signal is sent out by the radio frequency transceiver 21, passes through the frequency band B _ PA signal processor and is filtered by the broadband filter 24;
when receiving the band B signal, the path selection switch selects to switch on the band B _ LNA transmission path, and the signal is filtered by the wideband filter 24, passes through the band B _ LNA signal processor, and is finally received by the radio frequency transceiver 21.
In the above scheme, the rf front end architecture may be configured to transmit signals of at least two frequency bands. When the frequency band of the transmission signal is 3 or more than 3, the transmission path corresponding to the signal of each frequency band may include: the PA transmission path corresponding to the frequency band, or the LNA transmission path corresponding to the frequency band, or the PA transmission path and the LNA transmission path corresponding to the frequency band. Any one of the PA transmission paths includes a PA corresponding to the frequency band, and any one of the LNA transmission paths includes an LNA corresponding to the frequency band.
When a signal of a certain frequency band is transmitted, the path selection switch selects to switch on the PA transmission path corresponding to the frequency band, and the signal is transmitted by the radio frequency transceiver 21, passes through the PA corresponding to the frequency band, and is filtered by the broadband filter 24;
when receiving a signal in a certain frequency band, the path selection switch selects to turn on the LNA transmission path corresponding to the frequency band, and the signal is filtered by the wideband filter 24, passes through the LNA corresponding to the frequency band, and is finally received by the radio frequency transceiver 21.
In the above scheme, the wideband filter 24 is a wideband filter for transmitting signals of at least two frequency bands. The wideband filter supports frequency ranges of band a and band B. The characteristics of the wideband filter and the relationship to the frequency range of frequency band A, B are shown in fig. 3, where the passband frequency range of the wideband filter in fig. 3 includes the frequency ranges of frequency band a and frequency band B.
When the transmission signal frequency band is 3 or more than 3, the wideband filter supports the frequency range of the 3 or more than 3 total transmission signal frequency bands, that is, the passband frequency range of the wideband filter includes the frequency range of the 3 or more than 3 total transmission signal frequency bands.
In an embodiment of the present application, when the radio Frequency front end architecture is in a Frequency Division Duplex (FDD) Frequency band, as shown in fig. 4, the method includes: a radio frequency transceiver 41, a signal processor 42, a path selection switch 43, and a broadband duplexer 44;
the transmission path connected to the rf transceiver 41 may be divided into: a transmission path for a received signal and a transmission path for a transmitted signal. In addition, the wideband duplexer 44 is used to implement the function of a wideband filter when the rf front end architecture is in the FDD band.
In the above embodiment, the path selection switch 43 may include:
a band selection switch (TX band selection switch) for transmitting a signal, or,
a band selection switch (RX band selection switch) for receiving a signal, or,
a band selection switch (TX band selection switch) for transmitting signals and a band selection switch (RX band selection switch) for receiving signals.
Specifically, in the above scheme, in the transmission path to which the radio frequency transceiver is connected,
the transmission path for the transmitted signal may include: a frequency band a _ PA transmission path, or a frequency band B _ PA transmission path, or a frequency band a _ PA transmission path and a frequency band B _ PA transmission path;
the transmission path for the received signal may include: a band a _ LNA transmission path, or a band B _ LNA transmission path, or a band a _ LNA transmission path and a band B _ LNA transmission path.
In the above scheme, when the rf front end architecture operates, the path selection switch may be used to determine a transmission path according to a frequency band and a transceiving mode of a signal:
when a frequency band a signal is transmitted, the frequency band selection switch (TX frequency band selection switch) for transmitting the signal is turned on, the frequency band selection switch (RX frequency band selection switch) for receiving the signal is turned off, and the TX frequency band selection switch selects to turn on the frequency band a _ PA transmission path, so that the signal is transmitted by the radio frequency transceiver 41, passes through the frequency band a _ PA signal processor, and is filtered by the broadband duplexer 44;
when a frequency band B signal is transmitted, the frequency band selection switch (TX frequency band selection switch) for transmitting the signal is turned on, the frequency band selection switch (RX frequency band selection switch) for receiving the signal is turned off, and the TX frequency band selection switch selects to turn on the frequency band B _ PA transmission path, so that the signal is transmitted by the radio frequency transceiver 41, passes through the frequency band B _ PA signal processor, and is filtered by the broadband duplexer 44;
when receiving a band a signal, the band selection switch (RX band selection switch) for receiving the signal is turned on, the band selection switch (TX band selection switch) for sending the signal is turned off, and the RX band selection switch selects to turn on the band a _ LNA transmission path, so that the signal is filtered by the wideband duplexer 44, passes through the band a _ LNA signal processor, and is finally received by the radio frequency transceiver 41;
when receiving the band B signal, the band selection switch (RX band selection switch) for receiving the signal is turned on, the band selection switch (TX band selection switch) for sending the signal is turned off, and the RX band selection switch selects to turn on the band B _ LNA transmission path, so that the signal is filtered by the wideband duplexer 44, and then is received by the radio frequency transceiver 41 through the band B _ LNA signal processor.
In the above scheme, the rf front end architecture may be configured to transmit signals of at least two frequency bands. When the frequency band of the transmission signal is 3 or more than 3, the transmission path corresponding to the signal of each frequency band may include: the PA transmission path corresponding to the frequency band, or the LNA transmission path corresponding to the frequency band, or the PA transmission path and the LNA transmission path corresponding to the frequency band. Any one of the PA transmission paths includes a PA corresponding to the frequency band, and any one of the LNA transmission paths includes an LNA corresponding to the frequency band. All PA transmission paths of the 3 or more than 3 transmission signal frequency bands are connected to the radio frequency transceiver 41 and the TX frequency band selection switch; all LNA transmission paths of the 3 or more than 3 transmission signal frequency bands are connected to the rf transceiver 41 and the RX frequency band selection switch.
When a signal of a certain frequency band is transmitted, the frequency band selection switch (TX frequency band selection switch) for transmitting the signal is turned on, the frequency band selection switch (RX frequency band selection switch) for receiving the signal is turned off, and the TX frequency band selection switch selects to turn on the PA transmission path corresponding to the frequency band, so that the signal is transmitted by the radio frequency transceiver 41, passes through the PA corresponding to the frequency band, and is filtered by the broadband duplexer 44;
when receiving a signal of a certain frequency band, the frequency band selection switch (RX frequency band selection switch) for receiving the signal is turned on, the frequency band selection switch (TX frequency band selection switch) for sending the signal is turned off, and the RX frequency band selection switch selects to turn on the LNA transmission path corresponding to the frequency band, so that the signal is filtered by the wideband duplexer 44, passes through the LNA corresponding to the frequency band, and is finally received by the radio frequency transceiver 41.
When the rf front-end architecture is in the FDD band, the wideband duplexer 44 supports the frequency ranges of band a and band B for the wideband duplexer that is used to transmit at least two bands. The characteristics of the wideband duplexer in the TX frequency band and the relationship with the frequency ranges of the band a TX and the band B TX are shown in fig. 5, and in fig. 5, the TX passband frequency range of the wideband duplexer includes the TX frequency ranges of the band a and the band B. The characteristics of the wideband duplexer in the RX band and the relationship between the wideband duplexer and the frequency ranges of the bands a RX and B RX are shown in fig. 6, and in fig. 6, the RX passband frequency range of the wideband duplexer includes the RX frequency ranges of the band a and the band B.
When the transmission signal frequency bands are 3 or more than 3, the wideband duplexer supports the frequency ranges of the 3 or more than 3 total transmission signal frequency bands, that is, the TX passband frequency range of the wideband filter includes the TX frequency ranges of the 3 or more than 3 total transmission signal frequency bands; the RX passband frequency range of the wideband filter encompasses the RX frequency ranges of the 3 or more than 3 total transmission signal bands.
In an embodiment, the rf front end architecture may further include an antenna, as shown in fig. 7, including: a radio frequency transceiver 71, a signal processor 72, a path selection switch 73, a wideband filter 74 and an antenna 75.
In the above scheme, when a signal in a frequency band a or a frequency band B is transmitted, the path selection switch selects and connects a transmission path in a corresponding frequency band, and after the signal is transmitted by the radio frequency transceiver 71, the signal passes through a signal processor in the corresponding frequency band, is filtered by the broadband filter 74, and is finally transmitted by the antenna 75;
when receiving a signal in the frequency band a or the frequency band B, the path selection switch selectively switches on a transmission path in the corresponding frequency band, and the signal is received by the antenna 75, filtered by the wideband filter 74, passed through the signal processor in the corresponding frequency band, and finally received by the radio frequency transceiver 71;
in another embodiment, the rf front end architecture may further include: the antenna switch, as shown in fig. 8, includes: a radio frequency transceiver 81, a signal processor 82, a path selection switch 83, a broadband filter 84, an antenna and antenna switch 85, a signal processor 86 and a broadband filter 87.
In the above embodiment, when there is a transmission path that does not pass through the wideband filter 84 (shared wideband filter) in the rf front-end architecture, the antenna switch is used to select the transmission path where different wideband filters are located, so as to connect the transmission path to the antenna.
It should be noted that there are various embodiments of the technical solution of the present application, and the technical solution is not limited to the four architecture solutions listed in fig. 2, fig. 4, fig. 7, and fig. 8, and the transmission path connected to the wideband filter in one or more frequency bands is added in the above embodiments, and all of the embodiments belong to the protection scope of the present application as long as the purpose of the present application can be achieved.
The technical solutions described in the embodiments of the present application can be arbitrarily combined without conflict.
In the embodiments provided in the present application, it should be understood that the disclosed method and intelligent device may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all functional units in the embodiments of the present application may be integrated into one unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The above description is only for the specific embodiments of the present application, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (9)
1. A radio frequency front end architecture, characterized in that the radio frequency front end architecture comprises: the system comprises a radio frequency transceiver, a signal processor, a path selection switch and a broadband filter; wherein the content of the first and second substances,
the radio frequency transceiver is used for receiving and/or transmitting signals;
the signal processor is used for processing the signals;
the path selection switch is used for selecting a first signal transmission path matched with the frequency range of the signal;
the broadband filter is used for transmitting signals of at least two frequency bands.
2. The radio frequency front end architecture of claim 1, wherein the first signal transmission path comprises at least:
a first signal transmission path transmitting a first frequency band and a first signal transmission path transmitting a second frequency band.
3. The radio frequency front end architecture of claim 2, wherein the first signal transmission path for transmitting the first frequency band comprises:
a PA transmission path for performing power amplification on the signal of the first frequency band;
and/or, LNA transmission path for low noise amplification of the signals of the first frequency band.
4. The radio frequency front end architecture of claim 2, wherein the first signal transmission path for transmitting the second frequency band comprises:
a PA transmission path for performing power amplification on the signal of the second frequency band;
and/or, LNA transmission path for low noise amplification of the signals of the second frequency band.
5. The radio frequency front end architecture of claim 1, wherein the first signal transmission path comprises at least:
a transmission path for a received signal and a transmission path for a transmitted signal.
6. The radio frequency front end architecture of claim 5, wherein the path selection switch comprises at least:
a frequency band selection switch for transmitting signals and/or a frequency band selection switch for receiving signals.
7. The radio frequency front end architecture of claim 5, wherein the wideband filter is a duplexer for transmitting at least two frequency bands.
8. The radio frequency front end architecture of any one of claims 1 to 7, further comprising:
the antenna is used for receiving a signal input from the outside of the radio frequency front-end architecture and transmitting the signal to the broadband filter;
and/or the broadband filter is used for receiving the signal sent by the broadband filter and transmitting the signal to the outside of the radio frequency front end architecture.
9. The rf front-end architecture of claim 8, wherein when there is a second signal transmission path that does not pass through the wideband filter, the rf front-end architecture further comprises:
an antenna switch for selecting the first signal transmission path or the second signal transmission path.
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| WO2023061090A1 (en) * | 2021-10-15 | 2023-04-20 | 深圳飞骧科技股份有限公司 | Radio frequency front-end module covering multiple frequency bands and wireless communication device |
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| WO2023061090A1 (en) * | 2021-10-15 | 2023-04-20 | 深圳飞骧科技股份有限公司 | Radio frequency front-end module covering multiple frequency bands and wireless communication device |
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