CN113055045B - Radio frequency front-end circuit and electronic equipment - Google Patents
Radio frequency front-end circuit and electronic equipment Download PDFInfo
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- CN113055045B CN113055045B CN202110268397.2A CN202110268397A CN113055045B CN 113055045 B CN113055045 B CN 113055045B CN 202110268397 A CN202110268397 A CN 202110268397A CN 113055045 B CN113055045 B CN 113055045B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
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Abstract
The application provides a radio frequency front end circuit and an electronic device. The radio frequency front-end circuit of the present application includes: a first receive path connected to the transceiver, including a first low noise amplifier; the first filter is used for respectively filtering signals outside a first frequency band and signals outside a second frequency band; a second filter; a first antenna; the first end of the first switch is connected with the first low noise amplifier; the second end of the first switch is connected with the first filter; the first end of the second switch is connected with the first antenna through the double-pole double-throw switch; the second end of the second switch is connected with the first filter, and the third end of the second switch is connected with the second filter; the second filter is a filter for filtering out signals outside the third frequency band, or a filter for respectively filtering out signals outside the first frequency band and signals outside the third frequency band. The switching of the radio frequency channel can be realized through the separated first switch, the second switch and the first filter, and the manufacturing cost of the whole machine is reduced.
Description
Technical Field
The application relates to the technical field of electronic equipment, in particular to a radio frequency front-end circuit and electronic equipment.
Background
At present, in the development of the fifth generation mobile communication technology (5G for short), the peak rate of 5G NR can reach 20Gbps, and the improvement of the rate requires that 5G supports 4 × 4MIMO technology. That is, for the N41 frequency band, four antennas are required, and for the B41 frequency band of 4G Long Term Evolution (LTE), two antennas of a main set reception PRX and a diversity reception DRX are required, and 6 antennas are required in total, but the space of the mobile phone is limited, which brings great challenges to the design of radio frequency and antenna architecture.
In a Non-independent Networking (NSA) mode, due to the fact that frequency of B41 is the same as that of N41, antenna multiplexing can be achieved, and the number of antennas is reduced, that is, a five-antenna scheme is achieved, however, in the existing scheme for achieving five antennas, a 4G radio frequency module bifem must be multiplexed, and in order to be compatible with signal isolation and signal difference loss between radio frequency paths, the problems that an internal switch of the radio frequency module bifem is complex in design, and technical difficulty and cost are increased are caused, so that manufacturing cost of a whole machine is improved.
Disclosure of Invention
An object of the embodiments of the present application is to provide a radio frequency front end circuit and an electronic device, so as to solve the problem of high manufacturing cost of the whole device due to complex design and high difficulty of the existing radio frequency architecture.
In order to solve the technical problem, the invention is realized as follows:
in a first aspect, an embodiment of the present application provides a radio frequency front-end circuit, which is applied to an electronic device, and includes:
a transceiver and a first receive path connected to a first port of the transceiver, the first receive path comprising:
a first low noise amplifier connected to the first port;
the first filter is used for filtering signals outside a first frequency band and signals outside a second frequency band respectively;
a second filter;
a first antenna;
a first switch, a first end of which is connected to the first low noise amplifier, and a second end of which is connected to the first filter;
a second switch, a first terminal of which is connected to the first antenna through a double-pole double-throw switch, a second terminal of which is connected to the first filter, and a third terminal of which is connected to the second filter;
the second filter is a filter for filtering signals outside a third frequency band, or the second filter is a filter for filtering signals outside the first frequency band and signals outside the third frequency band respectively;
under the condition that the electronic equipment works in the first frequency band and the second frequency band, the first end of the first switch is conducted with the second end of the first switch, the first end of the second switch is conducted with the second end of the second switch, and the first port is used for receiving the radio-frequency signals in the first frequency band in a diversity mode.
In a second aspect, an embodiment of the present application further provides an electronic device, including: the rf front-end circuit according to the above embodiments.
In the above solution of the embodiment of the present application, the first receiving path connected to the first port of the transceiver includes a first low noise amplifier connected to the first port; the first filter is used for respectively filtering signals outside a first frequency band and signals outside a second frequency band; a second filter; a first antenna; the first end of the first switch is connected with the first low noise amplifier; the second end of the first switch is connected with the first filter; the first end of the second switch is connected with the first antenna through the double-pole double-throw switch; the second end of the second switch is connected with the first filter, and the third end of the second switch is connected with the second filter; the second filter is a filter for filtering signals outside a third frequency band, or is a filter for respectively filtering signals outside the first frequency band and signals outside the third frequency band; under the condition that the electronic equipment works in a first frequency band and a second frequency band, a first end of a first switch is communicated with a second end of the first switch, a first end of a second switch is communicated with a second end of the second switch, and a first port is used for receiving radio-frequency signals in the first frequency band in a diversity mode.
Drawings
FIG. 1 is a schematic diagram of a conventional RF front-end circuit;
fig. 2 is a schematic diagram of an rf front-end circuit according to an embodiment of the present disclosure;
fig. 3 is a second schematic diagram of an rf front-end circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one.
In order to make those skilled in the art better understand the rf front-end circuit of the embodiments of the present application, the following description is made.
Fig. 1 shows a diagram of a radio frequency architecture for implementing five antennas in the prior art. Specifically, N411T2R is satisfied. The specific realization principle is as follows:
mainly comprises a main set receiving (hereinafter referred to as B3 PRX) of a B3 frequency band and a signal receiving (hereinafter referred to as N41 RX) multiplexing power amplifier module PH6MHPAMiD of an N41 frequency band, wherein the power amplifier module PH6 MPAMID is integrated with a duplexer, a diversity receiving (hereinafter referred to as B3 DRX) of a B3 frequency band and a radio frequency module DiFEM of an N41 RX multiplexing integrated with a radio frequency switch and a filter, or the diversity receiving (hereinafter referred to as B39 DRX) of a B39 frequency band and an N41 RX multiplexing DIEM are matched with a fifth antenna; the LTE B3 and the N41 can work at the same time, or the LTE B39 and the N41 can work at the same time; the specific work is as follows (see fig. 1):
1. first path receiving Path (PRX): radio frequency signals of an N41 frequency band reach a double-pole double-throw switch DPDT1 through an ANT0_ TRX antenna, the DPDT1 is switched to an N41 Surface Acoustic Wave (SAW) filter, and after passing through an N41SAW filter, the DPDT is switched to a Low Noise Amplifier (LNA) through an internal switch, and finally a PRX path is output.
2. Second reception path (DRX): the signal of N41 frequency channel passes through ANT1_ DRX antenna, reaches DPDT1, DPDT1 switches to B41 SAW filter, reaches LNA after SAWB41 SAW filter, finally outputs DRX route.
3. Third receive path (PRX _ MIMO): there are two cases, the main reason for this is that PH6MHPAMiD only supports simultaneous downlink operations of B3 and N41, and does not support simultaneous operations of B39 and N41:
a. the third receive path may multiplex the 4GMHB TRX antenna when the electronic device is operating in the DC _ B3+ N41 frequency band.
Namely: the B3 PRX signal and the N41 signal reach DPDT2 through ANT3_ B41_ TRX/N41_ PRX _ MIMO antenna at the same time, DPDT2 switches to PH6 MHPAMiD; the B3 SAW filter and the N41SAW filter are simultaneously switched through the PH6MHPAMiD internal switch, the N41 signal is switched to the PH6MHPAMiD 41 RX through the internal switch, then is switched to the N41 external LNA through the external single-pole double-throw switch SPDT1 RF1, and finally is output to the N41PRX _ MIMO.
b. When the electronic equipment works in a DC _ B39+ N41 frequency band, due to the fact that a PH6MHPAMiD B39 and N41 cannot work simultaneously in downlink and cannot multiplex a B41 TRX antenna, an N41 signal reaches an N41SAW filter through ANT5_ N41PRX _ MIMO, is switched to an N41 external LNA through SPDT1 RF2, and is output to N41PRX _ MIMO.
4. Fourth reception path (DRX _ MIMO): n41 DRX _ MIMO multiplexes 4G B41 dfem, i.e.: the B3 DRX signal and the N41 signal, or the B39 DRX signal and the N41 signal, reach the DPDT2 through the ANT4_ B41_ TRX/N41_ PRX MIMO antenna at the same time, the DPDT2 switches to the radio frequency module bifem, and the bifem opens the B39+ N41 path or the B3+ N41 path at the same time through an internal switch.
The key that DRX _ MIMO can multiplex 4G diffem is that bifem can turn on the internal B3 and N41 switches simultaneously, or turn on the B39 and N41 switches simultaneously.
It should be noted that the LTE B39 PRX signal reaches the DPDT2 through the ANT3, is switched to PH6MHPAMiD through the DPDT2, and is output to the PRX path of the B39 through PH6 MHPAMiD.
Since the 4G rf module bifem must be multiplexed in the above scheme for implementing five antennas, and since the bifem can simultaneously turn on the internal switch, the signal isolation and signal differential loss between the rf paths cannot be compatible, if the above problems are to be overcome, the internal switch of the bifem is complicated in design, and the technical difficulty and cost are increased.
In order to solve the above problem, embodiments of the present application provide a radio frequency front end circuit and an electronic device. The radio frequency front end circuit provided by the embodiment of the present application will be described in detail through specific embodiments and application scenarios thereof with reference to the accompanying drawings.
Fig. 2 and fig. 3 are schematic structural diagrams of an rf front-end circuit according to an embodiment of the present disclosure. The radio frequency front-end circuit is applied to electronic equipment. Can include the following steps: a transceiver 1; a first receive path connected to a first port of the transceiver 1, the first receive path comprising: a first low noise amplifier 2 connected to the first port; a first filter 3, the first filter 3 being configured to filter out signals outside a first frequency band and signals outside a second frequency band, respectively; a second filter 4; a first antenna 5; a first switch 6, a first end of the first switch 6 is connected with the first low noise amplifier 2, and a second end of the first switch 6 is connected with the first filter 3; a second switch 7, a first end of the second switch 7 is connected with the first antenna 5 through a double-pole double-throw switch 8, a second end of the second switch 7 is connected with the first filter 3, and a third end of the second switch 7 is connected with the second filter 4; the second filter 4 is a filter for filtering out signals outside the third frequency band, or the second filter 4 is a filter for filtering out signals outside the first frequency band and signals outside the third frequency band, respectively.
Under the condition that the electronic device works in the first frequency band and the second frequency band, the first end of the first switch 6 is conducted with the second end of the first switch 6, the first end of the second switch 7 is conducted with the second end of the second switch 7, and the first port is used for receiving the radio-frequency signals in the first frequency band in a diversity mode.
It should be noted that the first frequency band is a first NR frequency band, and optionally, the first frequency band is an N41 frequency band. The second frequency band is a first LTE frequency band, and optionally, the second frequency band is a B39 frequency band. The third frequency band is a second LTE frequency band, and optionally, the third frequency band is a B3 frequency band.
Optionally, the first filter 3 is a SAW filter. Optionally, the second filter 4 is a SAW filter.
Note that the first antenna is used to receive diversity reception signals in the B41 frequency band or the N41 frequency band.
Here, when the electronic device operates in the first frequency band and the second frequency band, the first terminal of the first switch 6 is conducted with the second terminal of the first switch 6, the first terminal of the second switch 7 is conducted with the second terminal of the second switch 7, the first terminal of the second switch 7 is conducted with the first antenna 5 through the double-pole double-throw switch 8, that is, the first receiving path is conducted, that is, the first low noise amplifier 2 is electrically connected to the first filter 3, and the first filter 3 is electrically connected to the first antenna 5. At this time, the first antenna 5 receives the radio frequency signal of the first frequency band and the radio frequency signal of the second frequency band, and the radio frequency signals reach the first filter 3 through the double-pole double-throw switch 8 and the second switch 7, because the first filter 3 is used for filtering out signals outside the first frequency band and signals outside the second frequency band, the radio frequency signals of the first frequency band and the radio frequency signals of the second frequency band are obtained through filtering processing, and the radio frequency signals of the first frequency band are transmitted to the transceiver 1 through the first switch 6 and the first low noise amplifier 2. Therefore, through the separated first switch, the second switch and the first filter, the switching of a radio frequency channel when the electronic equipment works in the first frequency band and the second frequency band can be realized, so that diversity receiving signals of the first frequency band can be received by the transceiver, the normal communication of the electronic equipment is ensured, and the manufacturing cost of the whole machine can be reduced by adopting the simple components and circuit design.
It should be noted that the radio frequency signal of the first frequency band is a diversity reception signal of the first frequency band, and the radio frequency signal of the second frequency band is a diversity reception signal of the second frequency band.
Specifically, under the condition that the electronic device operates in the N41 frequency band and the B39 frequency band, the first antenna 5 receives the radio frequency signal of the N41 frequency band and the radio frequency signal of the B39 frequency band, and the radio frequency signals reach the first filter 3 through the double-pole double-throw switch 8 and the second switch 7, because the first filter 3 is used for filtering out signals outside the N41 frequency band and signals outside the B39 frequency band, the radio frequency signals of the N41 frequency band and the radio frequency signals of the B39 frequency band are obtained through filtering processing, and then the radio frequency signals of the N41 frequency band are transmitted to the transceiver 1 through the first switch 6 and the first low noise amplifier 2; the radio frequency signal in the B39 frequency band is subjected to corresponding low noise amplification processing, and is finally transmitted to the transceiver 1.
The radio frequency front-end circuit of the embodiment of the application, a first receiving path connected with a first port of a transceiver, comprises a first low noise amplifier connected with the first port; the first filter is used for respectively filtering signals outside a first frequency band and signals outside a second frequency band; a second filter; a first antenna; the first end of the first switch is connected with the first low noise amplifier; the second end of the first switch is connected with the first filter; the first end of the second switch is connected with the first antenna through the double-pole double-throw switch; the second end of the second switch is connected with the first filter, and the third end of the second switch is connected with the second filter; the second filter is a filter for filtering signals outside a third frequency band, or is a filter for respectively filtering signals outside the first frequency band and signals outside the third frequency band; under the condition that the electronic equipment works in a first frequency band and a second frequency band, a first end of a first switch is communicated with a second end of the first switch, a first end of a second switch is communicated with a second end of the second switch, and a first port is used for receiving radio-frequency signals in the first frequency band in a diversity mode.
As an optional implementation manner, as shown in fig. 2, in a case that the second filter 4 is a filter for filtering out a signal outside the third frequency band, the first receiving path of the embodiment of the present application further includes: a second antenna 9, a third filter 10 and a third switch 11, wherein the third filter 10 is connected with the first ends of the second antenna 9 and the third switch 11 respectively, and the third end of the first switch 6 is connected with the third end of the third switch 11.
Based on this, when the electronic device operates in the first frequency band and the third frequency band, the first terminal of the first switch 6 is conducted with the third terminal of the first switch 6, the first terminal of the second switch 7 is conducted with the third terminal of the second switch 7, and the first terminal of the third switch 11 is conducted with the third terminal of the third switch 11.
It should be noted that the third filter 10 is used for filtering out signals outside the first frequency band. Here, the first frequency band may be an N41 frequency band or a B41 frequency band.
Here, the second antenna 9 is used to receive a main set reception signal of the N41 frequency band or a diversity reception signal of the N41 frequency band.
Here, when the electronic device operates in the first frequency band and the third frequency band, the first end of the first switch 6 is conducted with the third end of the first switch 6, the first end of the second switch 7 is conducted with the third end of the second switch 7, the first end of the third switch 11 is conducted with the third end of the third switch 11, that is, the first receiving path is conducted, that is, the first low noise amplifier 2 is electrically connected with the third filter 10, the third filter 10 is electrically connected with the second antenna 9, and the second filter 4 is electrically connected with the first antenna 5, at this time, the second antenna 9 receives the radio frequency (diversity) signal of the first frequency band, and filters the signal outside the first frequency band through the third filter 10 to obtain the radio frequency signal of the first frequency band, and the radio frequency signal of the first frequency band is transmitted to the transceiver 1 through the third switch 11, the first switch 6, and the first low noise amplifier 2; the first switch 5 receives the radio frequency signal of the third frequency band, the radio frequency signal reaches the second filter 4 through the double-pole double-throw switch 8 and the second switch 7, the radio frequency signal of the third frequency band is obtained through filtering processing, and the radio frequency signal is subsequently amplified through corresponding low noise and finally transmitted to the transceiver 1. Therefore, through the separated first switch, the second switch, the third switch and the second filter, when the electronic equipment works in the first frequency band and the third frequency band, the switching of the radio frequency path can be realized, specifically, the switching of the radio frequency path from the first frequency band and the second frequency band and the switching of the radio frequency path from the first frequency band and the third frequency band can be realized, so that both the diversity receiving signal of the first frequency band and the diversity receiving signal of the third frequency band can be received by the transceiver, the normal communication of the electronic equipment is ensured, and the manufacturing cost of the whole machine can be reduced by adopting the simple components and circuit design.
Specifically, under the condition that the electronic device operates in the N41 frequency band and the B3 frequency band, the second antenna 9 receives the radio frequency signal in the N41 frequency band, and filters out the signal outside the N41 frequency band through the third filter 10 to obtain the radio frequency signal in the N41 frequency band, and the radio frequency signal in the N41 frequency band is transmitted to the transceiver 1 through the third switch 11, the first switch 6 and the first low noise amplifier 2; the first switch 5 receives radio frequency signals of a B3 frequency band, the radio frequency signals reach the second filter 4 through the double-pole double-throw switch 8 and the second switch 7, the radio frequency signals are filtered to obtain radio frequency signals of a B3 frequency band, and the radio frequency signals are amplified by corresponding low noise and finally transmitted to the transceiver 1.
Based on the first receiving path shown in fig. 2, as an optional implementation manner, the rf front-end circuit according to this embodiment of the application further includes: a second receive path connected to a second port of the transceiver 1, the second receive path comprising: a second low noise amplifier 12 connected to the second port; a fourth switch 13, wherein a first end of the fourth switch 13 is connected to the second low noise amplifier 12, and a second end of the fourth switch 13 is connected to a second end of the third switch 11; a third antenna 14; and the first radio frequency module 15 is connected with the third end of the fourth switch 13, the first radio frequency module 15 is connected with the third antenna 14 through the double-pole double-throw switch 8, and the second port is used for the main set to receive the radio frequency signals in the first frequency band.
It should be noted that the second receiving path further includes a second antenna 9, a third filter 10, and a third switch.
It should be noted that, referring to fig. 2, the amplifier PA, the filter, the duplexer and the switch are integrated in the first rf module 15. Optionally, the first rf module 15 is a PAMiD.
Here, the third antenna 14 is used for receiving a main set reception signal of the N41 band or transceiving a signal of the B41 band.
Based on this, under the condition that the electronic device operates in the first frequency band and the second frequency band, the first end of the fourth switch 13 is conducted with the second end of the fourth switch 13, and the second end of the third switch 11 is conducted with the first end of the third switch 11;
here, when the electronic device operates in the first frequency band and the second frequency band, the first end of the fourth switch 13 is conducted with the second end of the fourth switch 13, the second end of the third switch 11 is conducted with the first end of the third switch 11, that is, the second receiving path is conducted, that is, the second low noise amplifier 12 is electrically connected to the third filter 10, at this time, the second antenna 9 receives a radio frequency (main set) signal in the first frequency band, and the radio frequency signal in the first frequency band is transmitted to the transceiver 1 through the third switch 11, the fourth switch 13 and the second low noise amplifier 12, and is filtered by the third filter 10 to obtain a radio frequency signal outside the first frequency band; the third antenna 14 receives the radio frequency (main set) signal of the second frequency band, passes through the double-pole double-throw switch 8 and the first radio frequency module 15, is connected with the filter 153 for filtering the signal outside the second frequency band through the switch in the first radio frequency module 15, and is finally transmitted to the transceiver 1 after filtering processing. In this way, the multiplexing of the third filter 10 is realized through the separated third switch 11, so that the switching of the radio frequency path can be realized under the condition that the electronic device works in the first frequency band and the second frequency band, so that both the main set receiving signal of the first frequency band and the main set receiving signal of the second frequency band can be received by the transceiver, and the normal communication of the electronic device is ensured.
Specifically, under the condition that the electronic device operates in the N41 frequency band and the B39 frequency band, the second antenna 9 receives a radio frequency (main set) signal in the N41 frequency band, and filters a signal outside the N41 frequency band through the third filter 10 to obtain a radio frequency signal in the N41 frequency band, and the radio frequency signal in the N41 frequency band is transmitted to the transceiver 1 through the third switch 11, the fourth switch 13 and the second low noise amplifier 12; the third antenna 14 receives radio frequency (main set) signals in the B39 frequency band, passes through the double-pole double-throw switch 8 and the first radio frequency module 15, is connected with the filter 153 for filtering signals outside the B39 frequency band through the switch in the first radio frequency module 15, and finally transmits the signals to the transceiver 1 after filtering processing.
Under the condition that the electronic device works in the first frequency band and the third frequency band, the first end of the fourth switch 13 is conducted with the third end of the fourth switch 13, and the first radio frequency module 15 is conducted with the third antenna 14 through the double-pole double-throw switch 8.
Here, when the electronic device operates in the first frequency band and the third frequency band, the first end of the fourth switch 13 is conducted with the third end of the fourth switch 13, the first rf module 15 is conducted with the third antenna 14 through the double-pole double-throw switch 8, that is, the second receiving path is conducted, that is, the second low-noise amplifier 12 is electrically connected with the first rf module 15, the first rf module 15 is electrically connected with the third antenna 14, at this time, the third antenna 14 receives the radio-frequency (main set) signal of the first frequency band and the radio-frequency (main set) signal of the third frequency band, the radio-frequency (main set) signal reaches the first rf module 15 through the double-pole double-throw switch 8, the filter 151 for filtering out signals outside the first frequency band and the filter 152 for filtering out signals outside the third frequency band are simultaneously switched by the switch in the first rf module 15, the radio-frequency signal of the first frequency band and the radio-frequency signal of the third frequency band are obtained, and the radio-frequency signal of the first frequency band is transmitted to the transceiver 1 through the fourth switch 13 and the second low-noise amplifier 12 (ii) a The radio frequency signal of the third frequency band is amplified with low noise and finally transmitted to the transceiver 1.
As another alternative implementation, as shown in fig. 3, in the case that the second filter 4 is a filter for filtering out signals outside the third frequency band and signals outside the first frequency band, respectively, the third terminal of the first switch 6 is connected to the second filter 4;
under the condition that the electronic device works in the first frequency band and the third frequency band, the first end of the first switch 6 is conducted with the third end of the first switch 6, and the first end of the second switch 7 is conducted with the third end of the second switch 7.
Here, in the case where the electronic device operates in the first frequency band and the third frequency band, the first terminal of the first switch 6 is conducted with the third terminal of the first switch 6, the first terminal of the second switch 7 is conducted with the third terminal of the second switch 7, the first antenna 5 is electrically connected with the second filter 4 through the double-pole double-throw switch 8 and the second switch, that is, the first receiving path is conducted, that is, the first low noise amplifier 2 is electrically connected to the second filter 4, and the second filter 4 is electrically connected to the first antenna 5, and at this time, the first antenna 5 receives the radio frequency (diversity) signal of the first frequency band and the radio frequency (diversity) signal of the third frequency band, and the radio frequency (diversity) signals reach the second filter 4 through the double-pole double-throw switch 8 and the second switch 7, the second filter 4 is used for filtering out signals outside the first frequency band and signals outside the third frequency band, and filtering to obtain radio frequency signals of the first frequency band and radio frequency signals of the third frequency band; the radio frequency signal of the first frequency band is transmitted to the transceiver 1 through the first switch 6 and the first low noise amplifier 2; the radio frequency signal of the third frequency band is subjected to corresponding low noise amplification processing and finally transmitted to the transceiver 1. Thus, through the separated first switch 6, the second switch 7 and the second filter 4, when the electronic equipment works in the first frequency band and the third frequency band, the switching of the radio frequency path can be realized, specifically, the switching of the radio frequency path from the first frequency band and the second frequency band and the first frequency band and the third frequency band can be realized, so that the diversity receiving signal of the first frequency band and the diversity receiving signal of the third frequency band can be received by the transceiver, the normal communication of the electronic equipment is ensured, and the manufacturing cost of the whole machine can be reduced by adopting the simple components and circuit design.
Specifically, under the condition that the electronic device operates in the N41 frequency band and the B3 frequency band, the first antenna 5 receives radio frequency (diversity) signals of the N41 frequency band and radio frequency (diversity) signals of the B3 frequency band, and the radio frequency (diversity) signals reach the second filter 4 through the double-pole double-throw switch 8 and the second switch 7, and since the second filter 4 is used for filtering out signals outside the N41 frequency band and the B3 frequency band, the radio frequency signals of the N41 frequency band and the radio frequency signals of the B3 frequency band are obtained through filtering processing; the radio frequency signal of the N41 frequency band is transmitted to the transceiver 1 through the first switch 6 and the first low noise amplifier 2; the radio frequency signal in the B3 frequency band is subjected to corresponding low noise amplification processing, and is finally transmitted to the transceiver 1.
Based on the first receiving path shown in fig. 3, as an optional implementation manner, the rf front-end circuit according to this embodiment of the present application further includes: a third receive path connected to a third port of the transceiver 1, the third receive path comprising: a third low noise amplifier 16 connected to the third port; a fourth filter 17; a fourth antenna 18 connected to the fourth filter 17; a fifth antenna 19; a fifth switch 20, wherein a first end of the fifth switch 20 is connected to the third low noise amplifier 16, and a second end of the fifth switch 20 is connected to the fourth filter 17; and the second radio frequency module 21 is connected with a third end of the fifth switch 20, the second radio frequency module 21 is connected with the fifth antenna 19 through the double-pole double-throw switch 8, and the third end is used for the main set to receive the radio frequency signals in the first frequency band.
It should be noted that, referring to fig. 3, the amplifier PA, the filter, the duplexer, and the switch are integrated in the second rf module 21. Optionally, the second rf module 21 is a PAMiD.
Here, the fourth antenna 18 is used to receive a main set reception signal of the N41 frequency band or a diversity reception signal of the N41 frequency band.
Here, the fifth antenna 19 is used for receiving a main set reception signal of the N41 band or transceiving a signal of the B41 band.
Based on this, under the condition that the electronic device operates in the first frequency band and the second frequency band, the first end of the fifth switch 20 is conducted with the second end of the fifth switch 20;
here, when the electronic device operates in the first frequency band and the second frequency band, the first end of the fifth switch 20 is conducted with the second end of the fifth switch 20, that is, the third receiving path is conducted, that is, the third low noise amplifier 16 is electrically connected with the fourth filter 17, at this time, the fourth antenna 18 receives the radio frequency (main set) signal in the first frequency band, and filters the signal outside the first frequency band through the fourth filter 17 to obtain the radio frequency signal in the first frequency band, and the radio frequency signal in the first frequency band is transmitted to the transceiver 1 through the fifth switch 20 and the third low noise amplifier 16; the fifth antenna 19 receives the radio frequency (main set) signal of the second frequency band, passes through the double-pole double-throw switch 8 and the second radio frequency module 21, is connected with the filter 213 for filtering the signal outside the second frequency band through the switch in the second radio frequency module 21, and finally transmits the signal to the transceiver 1 after filtering processing.
Specifically, under the condition that the electronic device operates in the N41 frequency band and the B39 frequency band, the fourth antenna 18 receives a radio frequency (main set) signal in the N41 frequency band, and filters a signal outside the N41 frequency band through the fourth filter 17 to obtain a radio frequency signal in the N41 frequency band, and the radio frequency signal in the N41 frequency band is transmitted to the transceiver 1 through the fifth switch 20 and the third low noise amplifier 16; the fifth antenna 19 receives the radio frequency (main set) signal of B39 frequency band, passes through the double-pole double-throw switch 8 and the second radio frequency module 21, is connected with the filter 213 for filtering the signal outside the B39 frequency band through the switch in the second radio frequency module 21, and finally transmits the signal to the transceiver 1 after filtering processing.
Under the condition that the electronic device operates in the first frequency band and the third frequency band, the first terminal of the fifth switch 20 is conducted with the third terminal of the fifth switch 20, and the second rf module 21 is conducted with the fifth antenna 19 through the double-pole double-throw switch 8.
Here, when the electronic device operates in the first frequency band and the third frequency band, the first end of the fifth switch 20 is conducted with the third end of the fifth switch 20, the second radio frequency module 21 is conducted with the fifth antenna 19 through the double-pole double-throw switch 8, that is, the third receiving path is conducted, that is, the third low noise amplifier 16 is electrically connected with the second radio frequency module 21, the second radio frequency module 21 is electrically connected with the fifth antenna 19, at this time, the fifth antenna 19 receives the radio frequency (main set) signal of the first frequency band and the radio frequency (main set) signal of the third frequency band, the radio frequency (main set) signal reaches the second radio frequency module 21 through the double-pole double-throw switch 8, the filter 211 for filtering out the signal outside the first frequency band and the filter 212 for filtering out the signal outside the third frequency band are simultaneously switched through the switch in the second radio frequency module 21, the radio frequency signal of the first frequency band and the radio frequency signal of the third frequency band are obtained, and the radio frequency signal of the first frequency band is transmitted to the transceiver 1 through the fifth switch 20 and the third low noise amplifier 16 (ii) a The radio frequency signal of the third frequency band is amplified with low noise and finally transmitted to the transceiver 1.
It should be noted that the rf front-end circuit further includes two receiving paths, which are respectively configured to receive a main rf signal in the first frequency band and receive a diversity rf signal in the first frequency band. Here, the first frequency band is the N41 frequency band, and reference may be made to the radio frequency path corresponding to the antenna not labeled with a reference number in fig. 2 and 3. The same signal transmission process as in the prior art can be specifically referred to the explanation in fig. 1, and is not described here again.
An embodiment of the present application further provides an electronic device, where the electronic device includes the rf front-end circuit according to the above embodiment.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A radio frequency front-end circuit applied to an electronic device, comprising:
a transceiver and a first receive path connected to a first port of the transceiver, the first receive path comprising:
a first low noise amplifier connected to the first port;
the first filter is used for filtering signals outside a first frequency band and signals outside a second frequency band respectively;
a second filter;
a first antenna;
a first switch, a first end of which is connected to the first low noise amplifier, and a second end of which is connected to the first filter;
a second switch, a first terminal of which is connected to the first antenna through a double-pole double-throw switch, a second terminal of which is connected to the first filter, and a third terminal of which is connected to the second filter;
the second filter is a filter for filtering signals outside a third frequency band, or the second filter is a filter for filtering signals outside the first frequency band and signals outside the third frequency band respectively;
under the condition that the electronic device works in the first frequency band and the second frequency band, a first end of the first switch is conducted with a second end of the first switch, a first end of the second switch is conducted with a second end of the second switch, and the first port is used for receiving radio-frequency signals in the first frequency band in a diversity mode;
in case the second filter is a filter for filtering out signals outside the third frequency band,
the first receive path further comprises: the third filter is respectively connected with the second antenna and the first end of the third switch, and the third end of the first switch is connected with the third end of the third switch.
2. The rf front-end circuit of claim 1, wherein when the electronic device operates in the first frequency band and the third frequency band, the first terminal of the first switch is connected to the third terminal of the first switch, the first terminal of the second switch is connected to the third terminal of the second switch, and the first terminal of the third switch is connected to the third terminal of the third switch.
3. The rf front-end circuit of claim 1, further comprising: a second receive path connected to a second port of the transceiver, the second receive path comprising:
a second low noise amplifier connected to the second port;
a first end of the fourth switch is connected with the second low noise amplifier, and a second end of the fourth switch is connected with a second end of the third switch;
a third antenna;
and the first radio frequency module is connected with the third end of the fourth switch, the first radio frequency module is connected with the third antenna through the double-pole double-throw switch, and the second port is used for receiving the radio frequency signals in the first frequency band by the main set.
4. The RF front-end circuit of claim 3,
under the condition that the electronic device works in the first frequency band and the second frequency band, a first end of the fourth switch is conducted with a second end of the fourth switch, and a second end of the third switch is conducted with a first end of the third switch;
under the condition that the electronic equipment works in the first frequency band and the third frequency band, the first end of the fourth switch is conducted with the third end of the fourth switch, and the first radio frequency module is conducted with the third antenna through the double-pole double-throw switch.
5. The rf front-end circuit according to claim 1, wherein in a case where the second filter is a filter for filtering out a signal outside a third frequency band and a signal outside a first frequency band, respectively, the third terminal of the first switch is connected to the second filter;
under the condition that the electronic device works in the first frequency band and the third frequency band, the first end of the first switch is conducted with the third end of the first switch, and the first end of the second switch is conducted with the third end of the second switch.
6. The RF front-end circuit of claim 5, further comprising: a third receive path connected to a third port of the transceiver, the third receive path comprising:
a third low noise amplifier connected to the third port;
a fourth filter;
a fourth antenna connected to the fourth filter;
a fifth antenna;
a fifth switch, a first end of the fifth switch is connected to the third low noise amplifier, and a second end of the fifth switch is connected to the fourth filter;
and the second radio frequency module is connected with a third end of the fifth switch, the second radio frequency module is connected with the fifth antenna through the double-pole double-throw switch, and the third end is used for receiving the radio frequency signals in the first frequency band by the main set.
7. The RF front-end circuit of claim 6,
under the condition that the electronic equipment works in the first frequency band and the second frequency band, the first end of the fifth switch is conducted with the second end of the fifth switch;
under the condition that the electronic equipment works in the first frequency band and the third frequency band, the first end of the fifth switch is conducted with the third end of the fifth switch, and the second radio frequency module is conducted with the fifth antenna through the double-pole double-throw switch.
8. An electronic device, comprising: the RF front-end circuit of any one of claims 1 to 7.
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| CN202110268397.2A CN113055045B (en) | 2021-03-12 | 2021-03-12 | Radio frequency front-end circuit and electronic equipment |
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| CN202110268397.2A CN113055045B (en) | 2021-03-12 | 2021-03-12 | Radio frequency front-end circuit and electronic equipment |
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| CN114124139A (en) * | 2021-11-30 | 2022-03-01 | Oppo广东移动通信有限公司 | Radio frequency system and communication equipment |
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| CN111953375B (en) * | 2020-08-24 | 2022-01-28 | 维沃移动通信有限公司 | Radio frequency circuit and electronic device |
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