CN113452396B - Radio frequency front-end circuit and electronic equipment - Google Patents
Radio frequency front-end circuit and electronic equipment Download PDFInfo
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- CN113452396B CN113452396B CN202110655650.XA CN202110655650A CN113452396B CN 113452396 B CN113452396 B CN 113452396B CN 202110655650 A CN202110655650 A CN 202110655650A CN 113452396 B CN113452396 B CN 113452396B
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
Abstract
The invention discloses a radio frequency front-end circuit and electronic equipment, wherein the radio frequency front-end circuit comprises a first signal receiving channel, a second signal receiving channel and a radio frequency transceiver; the first signal receiving channel comprises an input module, an output module and a transmitting module; the input module receives the medium-high frequency signal and outputs the medium-high frequency signal to the transmitting module; the transmitting module transmits the medium-high frequency signal to the radio frequency transceiver through the output module; receiving a low frequency signal by the second signal receiving channel and outputting the low frequency signal to the radio frequency transceiver; the invention can effectively simplify the structure of the transmitting module, thereby achieving the effect of reducing the cost and further solving the problem of high cost in the existing radio frequency architecture.
Description
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
Since the 3GPP standard LTE release10 has a characteristic of supporting Carrier Aggregation (hereinafter, referred to as CA), LTE (Long Term Evolution) CA has the greatest advantage of enhancing uplink and downlink throughput compared to the existing release of low-version. LTE CA is largely classified into intra-band contiguous CA, intra-band non-contiguous CA, and inter-band CA, which has the outstanding advantage of increasing channel bandwidth no matter what form the CA exists.
There are three main factors affecting LTE throughput: channel bandwidth, MIMO format, and debug mode. For the two forms of LTE single frequency band and CA, the MIMO form and the modulation mode have no difference. The biggest difference is in channel bandwidth, the maximum channel bandwidth of general LTE is 20MHz, and the maximum support capability of the current platform can support 6CC, which is about 120MHz, theoretically, the throughput is 6 times that of a single frequency band. Therefore, in order to meet better user experience, operators recommend various combinations of CAs, such as if + if, if + if, etc., where if + if CA combinations are the most common, the coverage is the widest. However, the existing radio frequency architecture design for carrier aggregation has the problem of high cost by utilizing the frequency division effect inside the radio frequency module to achieve the purpose of carrier aggregation.
Thus, the prior art has yet to be improved and enhanced.
Disclosure of Invention
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, which can effectively reduce the cost while implementing carrier aggregation.
In order to achieve the purpose, the invention adopts the following technical scheme:
a radio frequency front end circuit comprises a first signal receiving channel, a second signal receiving channel and a radio frequency transceiver; the first signal receiving channel comprises an input module, an output module and a transmitting module; receiving the medium-high frequency signal by the input module and outputting the medium-high frequency signal to the transmitting module; the transmitting module transmits the medium-high frequency signal to the radio frequency transceiver through the output module; and receiving a low-frequency signal by the second signal receiving channel and outputting the low-frequency signal to the radio frequency transceiver.
The radio frequency front-end circuit further comprises a signal output channel, wherein the signal output channel comprises a frequency division module, a first transmitting branch and a second transmitting branch, and the frequency division module is respectively connected with the transmitting module, the first transmitting branch and the second transmitting branch; the transmitting module is used for outputting a transmitting signal to the frequency dividing module; the frequency dividing module is used for distributing an intermediate frequency signal in the transmitting signals to the first transmitting branch circuit and distributing a low frequency signal in the transmitting signals to the second transmitting branch circuit; the first transmitting branch is used for transmitting an intermediate frequency signal in the transmitting signals, and the second transmitting branch is used for transmitting a low frequency signal in the transmitting signals.
In the radio frequency front-end circuit, the input module comprises a first antenna and a frequency divider, and the first antenna is respectively connected with the frequency divider and the transmitting module; the first antenna is used for receiving the medium-high frequency signal and outputting the medium-high frequency signal to the frequency divider; the frequency divider is used for outputting the medium-high frequency signal to the radio frequency transceiver.
In the radio frequency front end circuit, the output module comprises a first duplexer, and the first duplexer is connected with the transmitting module; the first duplexer is used for outputting the medium-high frequency signal output by the transmitting module to the radio frequency transceiver.
In the radio frequency front-end circuit, the second signal receiving channel comprises a second antenna, a coupler, a first switch and a second duplexer which are connected in sequence; the second antenna is used for receiving the low-frequency signal and transmitting the low-frequency signal to the first switch through the coupler; the first switch is configured to output the low frequency signal to the second duplexer, and the second duplexer is configured to output the low frequency signal to the radio frequency transceiver.
In the radio frequency front-end circuit, the frequency dividing module comprises a frequency divider, and the frequency divider is respectively connected with the first transmitting branch and the second transmitting branch; the frequency divider is used for distributing an intermediate frequency signal in the transmitting signals to the first transmitting branch and distributing a low frequency signal in the transmitting signals to the second transmitting branch.
In the radio frequency front-end circuit, the first transmitting branch comprises a first antenna, and the first antenna is connected with the frequency divider; the first antenna is used for sending an intermediate frequency signal in the transmitting signal.
In the rf front-end circuit, the second transmitting branch includes a first switch, a coupler, and the second antenna; the first switch is respectively connected with the frequency divider and the coupler, and the coupler is connected with the second antenna; the first switch is used for outputting a low-frequency signal in the transmitting signals to the second antenna through the coupler; the second antenna is used for sending low-frequency signals in the transmitting signals.
In the radio frequency front-end circuit, the transmitting module comprises a second switch and a power amplifier; the second switch is respectively connected with the output module, the input module and the power amplifier.
An electronic device comprises the radio frequency front-end circuit.
Compared with the prior art, the radio frequency front-end circuit and the electronic equipment provided by the invention comprise a first signal receiving channel, a second signal receiving channel and a radio frequency transceiver; the first signal receiving channel comprises an input module, an output module and a transmitting module; the input module receives the medium-high frequency signal and outputs the medium-high frequency signal to the transmitting module; the transmitting module transmits the medium-high frequency signal to the radio frequency transceiver through the output module; receiving a low-frequency signal by the second signal receiving channel and outputting the low-frequency signal to the radio frequency transceiver; the invention can effectively simplify the structure of the transmitting module, thereby achieving the effect of reducing the cost and further solving the problem of high cost in the existing radio frequency architecture.
Drawings
Fig. 1 is a schematic diagram of a first embodiment of an rf front-end circuit according to the present invention;
fig. 2 is a block diagram of a second 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.
Detailed Description
The invention provides a radio frequency front-end circuit and electronic equipment, which can effectively reduce the cost while realizing carrier aggregation.
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 invention and are not intended to limit the invention.
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 invention will be further explained by the description of the embodiments with reference to the drawings.
Whether the radio frequency architecture can realize carrier aggregation depends mainly on whether each signal in the CA band is distinguished from the physical design. There are generally three ways to implement LTE carrier aggregation, and the first way is to implement inter-band CA for a quadruplex. For example, the combination of B2+ B4, such as B1+ B3/B25+ B66, can only exist in the form of a quadroplexer device in the process, in order to achieve frequency division of the B2+ B4 downstream signal and ensure mutual suppression of B2 and B4.
The second way is to implement inter-band CA for dual antennas. This form is simple and the signal is split by two independent transmit-receive antennas. The design has the advantages that other radio frequency devices are not required to be added, the principle is simpler, and certain front-end design modules can adopt the scheme design.
The third way is to implement inter-band CA for the frequency divider. The principle of the implementation mode is to perform aggregation processing on 2-path received signals through frequency division, the architectural design is mainly applied to 2 frequency bands with relatively far frequency difference, such as between low frequency and high frequency or between low frequency and high frequency, the principle of the implementation mode is similar to that of the second scheme, and the only difference is that the third scheme has one more frequency divider than the second scheme and two antennas are combined into one antenna.
According to the carrier aggregation method, the following radio frequency front end module TXM is derived, and the module mainly comprises 2 SP8T (single-input 8-output radio frequency switch) and 2G PA (power amplifier). The effect is as follows: 2 SP8T are used for connecing the duplex filter of low frequency and well high frequency respectively, and external different antenna ANT0 and ANT1,2G PA are the project demand of itself, just integrate in the module in addition in order to save PCB space.
Referring to fig. 1, for example, the radio frequency architecture in the first embodiment of the present invention is built in a B2+ B5CA combination form, and the working principle of the radio frequency architecture is as follows: two kinds of received signals of B2 and B5 are received to a radio frequency front end module TXM through an antenna ANT0, the received signals are divided into Signal1 and Signal2 through a frequency divider inside, B2 is transmitted to B2 PRX through a duplexer and then transmitted to a receiver, B5 is transmitted to the receiver in the same mode, B2 and B5 signals are aggregated in the receiver through a carrier aggregation algorithm to realize B2+ B5CA, in addition, a GSM low-frequency transmitting Signal comes out from ANT0, and a GSM intermediate-frequency Signal comes out from ANT1, the design mode is simple, and the purpose of carrier aggregation is achieved mainly by utilizing the frequency division effect inside the radio frequency front end module TXM. The biggest disadvantage of this method is high cost, and the core cost is reflected on the radio frequency front end module TXM.
Referring to fig. 2, the rf front-end circuit according to the second embodiment of the present invention includes a first signal receiving channel 100, a second signal receiving channel 200 and an rf transceiver 300; the first signal receiving channel 100 comprises an input module 110, an output module 120 and a transmitting module 130; the input module 110 is connected to the transmitting module 130, the transmitting module 130 is connected to the output module 120, and the second signal receiving channel 200 is connected to the transmitting module 130; the input module 110 receives the medium-high frequency signal and outputs the medium-high frequency signal to the transmitting module 130; transmitting, by the transmitting module 130, the medium-high frequency signal to the radio frequency transceiver 300 through the output module 120; a low frequency signal is received by the second signal receiving channel 200 and output to the radio frequency transceiver 300.
In this embodiment, the input module 110, the output module 120 and the transmitting module 130 form the first signal receiving channel 100, two channels, i.e., the first signal receiving channel 100 and the second signal receiving channel 200, respectively receive the medium-high frequency signal, e.g., a signal in a B2 frequency band, and the low frequency signal, e.g., a signal in a B5 frequency band, specifically, the input module 110 receives the medium-high frequency signal, and then outputs the medium-high frequency signal to the transmitting module 130, the transmitting module 130 outputs the medium-high frequency signal to the output module 120, and then outputs the medium-high frequency signal to the radio frequency transceiver 300 through the output module 120; for the low-frequency signal, the received low-frequency signal is output to the radio frequency transceiver 300 after being directly received by the second signal receiving channel 200, and the carrier aggregation function of two paths of signals is realized after internal carrier aggregation; in addition, the present invention receives through two receiving channels, and compared with the architecture in which the purpose of carrier aggregation is achieved by performing frequency division in the transmitting module 130 in the first embodiment, the present invention can effectively simplify the structure of the transmitting module 130, thereby achieving the effect of reducing the cost, and further solving the problem of high cost in the existing radio frequency architecture.
Further, the radio frequency front-end circuit further includes a signal output channel, where the signal output channel includes a frequency division module 410, a first transmission branch 420, and a second transmission branch 430, and the frequency division module 410 is connected to the transmission module 130, the first transmission branch 420, and the second transmission branch 430, respectively; in this embodiment, the transmitting module 130 is configured to output a transmitting signal to the frequency dividing module 410; the frequency dividing module 410 is configured to distribute an intermediate frequency signal in the transmission signals to the first transmission branch 420, and distribute a low frequency signal in the transmission signals to the second transmission branch 430; the first transmitting branch 420 is configured to transmit an intermediate frequency signal in the transmitting signals, and the second transmitting branch 430 is configured to transmit a low frequency signal in the transmitting signals, so that all the low frequency signals are divided into one branch and all the intermediate frequency signals are distributed in another branch.
In this embodiment, when the rf front-end circuit receives a signal, the input module 110 receives the medium-high frequency signal, and then outputs the medium-high frequency signal to the transmitting module 130, the transmitting module 130 outputs the medium-high frequency signal to the output module 120, and then the output module 120 outputs the medium-high frequency signal to the rf transceiver 300; for the low frequency signal, the low frequency signal is directly received by the second signal receiving channel 200, and then the received low frequency signal is output to the radio frequency transceiver 300, so as to implement a carrier aggregation function.
When the rf front-end circuit performs signal transmission, the transmitting module 130 outputs a transmitting signal to the frequency dividing module 410, the transmitting signal in this embodiment is a GSM signal, after the transmitting signal passes through the frequency dividing function of the frequency dividing module 410, a low-frequency signal in the transmitting signal flows into the second transmitting branch, an intermediate-frequency signal in the transmitting signal flows into the first transmitting branch, the intermediate-frequency signal is sent out by the first transmitting branch, and the low-frequency signal is sent out by the second transmitting branch, so that all the low-frequency signals are divided into one branch, and all the intermediate-frequency signals are distributed in another branch, thereby meeting the requirement of GSM signal division.
Further, referring to fig. 3, the input module 110 includes a first antenna 10 and a frequency divider 20, and the first antenna 10 is connected to the frequency divider 20 and the transmitting module 130 respectively; the first antenna 10 is configured to receive the medium-high frequency signal and output the medium-high frequency signal to the frequency divider 20; the frequency divider 20 is configured to output the medium-high frequency signal to the radio frequency transceiver 300.
In this embodiment, when the rf front-end circuit receives a signal, the first antenna 10 receives the medium-high frequency signal, and then the first antenna 10 outputs the medium-high frequency signal to the frequency divider 20, and the frequency divider 20 receives the medium-high frequency signal and then outputs the medium-high frequency signal to the transmitting module 130, that is, the frequency divider 20 is equivalent to be used for transmitting a signal when the rf front-end circuit receives a signal; after the transmitting module 130 receives the medium-high frequency signal, the transmitting module 130 outputs the medium-high frequency signal to the output module 120, and after the output module 120 receives the medium-high frequency signal, the medium-high frequency signal is output to the radio frequency transceiver 300, so as to receive the medium-high frequency signal.
Further, the output module 120 includes a first duplexer 30, and the first duplexer 30 is connected to the transmitting module 130; the first duplexer 30 is configured to output the medium-high frequency signal output by the transmitting module 130 to the radio frequency transceiver 300. When the rf front-end circuit receives a signal, the first antenna 10 receives the medium-high frequency signal, and then the first antenna 10 outputs the medium-high frequency signal to the frequency divider 20, and the frequency divider 20 receives the medium-high frequency signal and then outputs the medium-high frequency signal to the transmitting module 130, that is, the frequency divider 20 is equivalent to transmitting a signal when the rf front-end circuit receives a signal; after the transmitting module 130 receives the medium-high frequency signal, the transmitting module 130 outputs the medium-high frequency signal to the first duplexer 30, and after the first duplexer 30 receives the medium-high frequency signal, the medium-high frequency signal is output to the radio frequency transceiver 300, so as to receive the medium-high frequency signal.
Further, the second signal receiving path 200 includes a second antenna 40, a coupler 50, a first switch 60 and a second duplexer 70, which are connected in sequence; the second antenna 40 is used for receiving the low frequency signal and transmitting the low frequency signal to the first switch 60 through the coupler 50; the first switch 60 is configured to output the low frequency signal to the second duplexer 70, and the second duplexer 70 is configured to output the low frequency signal to the radio frequency transceiver 300.
Specifically, when the rf front-end circuit receives a signal, for the medium-high frequency signal, the first antenna 10 receives the medium-high frequency signal, and then the first antenna 10 outputs the medium-high frequency signal to the frequency divider 20, and after the frequency divider 20 receives the medium-high frequency signal, the medium-high frequency signal is output to the transmitting module 130, that is, the frequency divider 20 is equivalent to transmitting a signal when the rf front-end circuit receives a signal; after the transmitting module 130 receives the medium-high frequency signal, the transmitting module 130 outputs the medium-high frequency signal to the first duplexer 30, and after the first duplexer 30 receives the medium-high frequency signal, the medium-high frequency signal is output to the radio frequency transceiver 300, so as to receive the medium-high frequency signal.
For the low frequency signal, receiving the low frequency signal by the second antenna 40 and outputting the low frequency signal to the coupler 50; the coupler 50 outputs the low frequency signal to the first switch 60, in this embodiment, the first switch 60 is an SP3T switch, that is, a single-input 3-way output radio frequency switch, the first switch 60 outputs the low frequency signal to the second duplexer 70, and the second duplexer 70 outputs the low frequency signal to the radio frequency transceiver 300 after receiving the low frequency signal.
Further, the frequency dividing module 410 includes a frequency divider 20, where the frequency divider 20 is connected to the first transmitting branch and the second transmitting branch respectively; the frequency divider 20 is configured to distribute an intermediate frequency signal of the transmission signals to the first transmission branch, and distribute a low frequency signal of the transmission signals to the second transmission branch.
When the rf front-end circuit receives a signal, the first antenna 10 receives the medium-high frequency signal, and then the first antenna 10 outputs the medium-high frequency signal to the frequency divider 20, and the frequency divider 20 receives the medium-high frequency signal and then outputs the medium-high frequency signal to the transmitting module 130, that is, the frequency divider 20 is equivalent to transmitting a signal when the rf front-end circuit receives a signal; after the transmitting module 130 receives the medium-high frequency signal, the transmitting module 130 outputs the medium-high frequency signal to the first duplexer 30, and after the first duplexer 30 receives the medium-high frequency signal, the medium-high frequency signal is output to the radio frequency transceiver 300, so as to receive the medium-high frequency signal. Receiving the low frequency signal by the second antenna 40 and outputting the low frequency signal to the coupler 50; the coupler 50 outputs the low frequency signal to the first switch 60, in this embodiment, the first switch 60 is an SP3T switch, that is, a single-input 3-way output radio frequency switch, the first switch 60 outputs the low frequency signal to the second duplexer 70, and the second duplexer 70 outputs the low frequency signal to the radio frequency transceiver 300 after receiving the low frequency signal.
Then, when the rf front-end circuit is transmitting a signal, the frequency divider 20 is configured to separate an intermediate frequency signal and a low frequency signal in the transmission signal, specifically, after the transmission signal is subjected to the frequency dividing action of the frequency divider 20, the low frequency signal in the transmission signal flows into the second transmission branch 430, the intermediate frequency signal in the transmission signal flows into the first transmission branch 420, then the first transmission branch 420 sends the intermediate frequency signal, and the second transmission branch 430 sends the low frequency signal, so that all the low frequency signals are divided into one branch, and all the intermediate frequency signals are distributed in another branch, thereby meeting the requirement of GSM signal division.
Further, the first transmitting branch 420 includes a first antenna 10, and the first antenna 10 is connected to the frequency divider 20; the first antenna 10 is used for transmitting an intermediate frequency signal in the transmission signal. When the rf front-end circuit receives a signal, the first antenna 10 is used to receive the medium-high frequency signal, that is, the first antenna 10 receives the medium-high frequency signal, then the first antenna 10 outputs the medium-high frequency signal to the frequency divider 20, the frequency divider 20 outputs the medium-high frequency signal to the transmitting module 130 after receiving the medium-high frequency signal, the transmitting module 130 outputs the medium-high frequency signal to the first duplexer 30 after receiving the medium-high frequency signal, and the first duplexer 30 outputs the medium-high frequency signal to the rf transceiver 300 after receiving the medium-high frequency signal, thereby realizing the reception of the medium-high frequency signal.
When the rf front-end circuit transmits a signal, the first antenna 10 is configured to send an intermediate frequency signal in the transmission signal, that is, after the transmission signal passes through the frequency division effect of the frequency divider 20, a low frequency signal in the transmission signal flows into the second transmitting branch 430, the intermediate frequency signal in the transmission signal flows into the first transmitting branch 420, that is, flows into the first antenna 10, and then the first antenna 10 sends the intermediate frequency signal, and the second transmitting branch 430 sends the low frequency signal, so that all the low frequency signals are divided into one branch, and all the intermediate frequency signals are distributed in another branch, thereby meeting the requirement of GSM signal division.
Further, the second transmitting branch 430 includes a first switch 60, a coupler 50 and the second antenna 40; the first switch 60 is respectively connected to the frequency divider 20 and the coupler 50, and the coupler 50 is connected to the second antenna 40; the first switch 60 is used for outputting a low-frequency signal in the transmission signal to the second antenna 40 through the coupler 50; the second antenna 40 is used for transmitting a low frequency signal in the transmission signal.
When the rf front-end circuit receives a signal, the second antenna 40 is used to receive the low-frequency chip, that is, the second antenna 40 receives the low-frequency signal and outputs the low-frequency signal to the coupler 50; the coupler 50 outputs the low frequency signal to the first switch 60, in this embodiment, the first switch 60 is an SP3T switch, that is, a single-input 3-way output radio frequency switch, the first switch 60 outputs the low frequency signal to the second duplexer 70, and the second duplexer 70 outputs the low frequency signal to the radio frequency transceiver 300 after receiving the low frequency signal.
When the rf front-end circuit sends a signal, the second antenna 40 is used to send a low-frequency signal of the transmission signal; then, after the frequency division action of the frequency divider 20 is performed on the transmission signal, a low-frequency signal in the transmission signal flows into the second transmitting branch 430, an intermediate-frequency signal in the transmission signal flows into the first antenna 10, then the first antenna 10 sends out the intermediate-frequency signal, and the second transmitting branch 430 sends out the low-frequency signal, so that all the low-frequency signals are divided into one branch, and all the intermediate-frequency signals are distributed in another branch, thereby meeting the requirement of GSM signal division; in the second transmitting branch 430, the first switch 60 receives the low-frequency signal in the transmitting signal, and then the first switch 60 outputs the low-frequency signal in the transmitting signal to the second antenna 40 through the coupler 50, and the second antenna 40 sends out the low-frequency signal in the transmitting signal, that is, the rf front-end circuit in the present invention can realize the function of carrier aggregation and the function of GSM signal splitting, thereby achieving the cost reduction and enriching the function of the rf front-end circuit.
Further, the transmitting module 130 includes a second switch 131 and a power amplifier 132; the second switch 131 is respectively connected to the output module 120, the input module 110 and the power amplifier 132; similarly, when the rf front-end circuit receives a signal, the transmitting module 130 is equivalent to transmitting a signal, and when the rf front-end circuit transmits a signal, the transmitting module 130 is used to transmit the transmitted signal.
Specifically, when the rf front-end circuit receives a signal, the first antenna 10 receives the medium-high frequency signal, and then the first antenna 10 outputs the medium-high frequency signal to the frequency divider 20, and the frequency divider 20 receives the medium-high frequency signal and then outputs the medium-high frequency signal to the transmitting module 130, that is, the frequency divider 20 is equivalent to transmitting a signal when the rf front-end circuit receives a signal; after the transmitting module 130 receives the medium-high frequency signal, the transmitting module 130 outputs the medium-high frequency signal to the first duplexer 30, and after the first duplexer 30 receives the medium-high frequency signal, the medium-high frequency signal is output to the radio frequency transceiver 300, so as to receive the medium-high frequency signal. Receiving the low frequency signal by the second antenna 40 and outputting the low frequency signal to the coupler 50; the coupler 50 outputs the low frequency signal to the first switch 60, in this embodiment, the first switch 60 is an SP3T switch, that is, a single-input 3-way output radio frequency switch, the first switch 60 outputs the low frequency signal to the second duplexer 70, and the second duplexer 70 outputs the low frequency signal to the radio frequency transceiver 300 after receiving the low frequency signal.
When the rf front-end circuit is transmitting a signal, the power amplifier 132 amplifies the transmitted signal and outputs the amplified signal to the second switch 131, the second switch 131 is an SP14T switch, that is, a single-input 4-way output rf switch, the second switch 131 selectively outputs the transmitted signal to the frequency divider 20, after the transmitted signal is subjected to the frequency division action of the frequency divider 20, a low-frequency signal in the transmitted signal flows into the second transmitting branch 430, an intermediate-frequency signal in the transmitted signal flows into the first transmitting branch 420, the first transmitting branch 420 sends the intermediate-frequency signal, and the second transmitting branch 430 sends the low-frequency signal, so that all the low-frequency signals are divided into one branch, and all the intermediate-frequency signals are distributed in another branch, thereby meeting the requirement of splitting a GSM signal; the radio frequency front-end circuit can realize the function of carrier aggregation and the function of GSM signal shunt, thereby reducing the cost and enriching the functions of the radio frequency front-end circuit.
Further, the present invention also provides an electronic device, where the electronic device includes the above radio frequency front-end circuit, where the radio frequency front-end circuit includes a first signal receiving channel, a second signal receiving channel, and a radio frequency transceiver; the first signal receiving channel comprises an input module, an output module and a transmitting module; the input module is connected with the transmitting module, the transmitting module is connected with the output module, and the second signal receiving channel is connected with the transmitting module; the input module receives the medium-high frequency signal and outputs the medium-high frequency signal to the transmitting module; the transmitting module transmits the medium-high frequency signal to the radio frequency transceiver through the output module; the second signal receiving channel receives the low-frequency signal and outputs the low-frequency signal to the radio frequency transceiver.
In summary, the present invention provides a radio frequency front end circuit and an electronic device, where the radio frequency front end circuit includes a first signal receiving channel, a second signal receiving channel, and a radio frequency transceiver; the first signal receiving channel comprises an input module, an output module and a transmitting module; the input module receives the medium-high frequency signal and outputs the medium-high frequency signal to the transmitting module; the transmitting module transmits the medium-high frequency signal to the radio frequency transceiver through the output module; receiving a low frequency signal by the second signal receiving channel and outputting the low frequency signal to the radio frequency transceiver; the invention can effectively simplify the structure of the transmitting module, thereby achieving the effect of reducing the cost and further solving the problem of high cost in the existing radio frequency architecture.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (8)
1. A radio frequency front end circuit is characterized by comprising a first signal receiving channel, a second signal receiving channel and a radio frequency transceiver; the first signal receiving channel comprises an input module, an output module and a transmitting module; the input module receives the medium-high frequency signal and outputs the medium-high frequency signal to the transmitting module; the transmitting module transmits the medium-high frequency signal to the radio frequency transceiver through the output module; receiving a low frequency signal by the second signal receiving channel and outputting the low frequency signal to the radio frequency transceiver;
the input module comprises a first antenna and a frequency divider, and the first antenna is respectively connected with the frequency divider and the transmitting module; the first antenna is used for receiving the medium-high frequency signal and outputting the medium-high frequency signal to the frequency divider; the frequency divider is used for outputting the medium-high frequency signal to the radio frequency transceiver;
the transmitting module comprises a second switch and a power amplifier; the second switch is respectively connected with the output module, the input module and the power amplifier, wherein the second switch is a single-input 4-path output radio frequency switch.
2. The rf front-end circuit according to claim 1, further comprising a signal output channel, wherein the signal output channel comprises a frequency division module, a first transmission branch and a second transmission branch, and the frequency division module is connected to the transmission module, the first transmission branch and the second transmission branch respectively; the transmitting module is used for outputting a transmitting signal to the frequency dividing module; the frequency division module is used for distributing an intermediate frequency signal in the transmitting signals to the first transmitting branch and distributing a low frequency signal in the transmitting signals to the second transmitting branch; the first transmitting branch is configured to send an intermediate frequency signal in the transmitting signal, and the second transmitting branch is configured to send a low frequency signal in the transmitting signal.
3. The rf front-end circuit according to claim 1, wherein the output module comprises a first duplexer, the first duplexer being connected to the transmitting module; the first duplexer is used for outputting the medium-high frequency signal output by the transmitting module to the radio frequency transceiver.
4. The rf front-end circuit of claim 1, wherein the second signal reception path comprises a second antenna, a coupler, a first switch, and a second duplexer connected in sequence; the second antenna is used for receiving the low-frequency signal and transmitting the low-frequency signal to the first switch through the coupler; the first switch is configured to output the low frequency signal to the second duplexer, and the second duplexer is configured to output the low frequency signal to the radio frequency transceiver.
5. The rf front-end circuit of claim 2, wherein the frequency divider module comprises a frequency divider, the frequency divider being connected to the first and second transmit branches, respectively; the frequency divider is used for distributing an intermediate frequency signal in the transmitting signals to the first transmitting branch and distributing a low frequency signal in the transmitting signals to the second transmitting branch.
6. The rf front-end circuit of claim 5, wherein the first transmit branch comprises a first antenna, the first antenna coupled to the frequency divider; the first antenna is used for sending an intermediate frequency signal in the transmitting signal.
7. The radio frequency front-end circuit of claim 6, wherein the second transmit branch comprises a first switch, a coupler, and the second antenna; the first switch is respectively connected with the frequency divider and the coupler, and the coupler is connected with the second antenna; the first switch is used for outputting a low-frequency signal in the transmitting signals to the second antenna through the coupler; the second antenna is used for sending low-frequency signals in the transmitting signals.
8. An electronic device comprising the radio frequency front-end circuit of any one of claims 1 to 7.
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