CN112886979B - CA anti-frequency multiplication interference circuit, radio frequency circuit and communication equipment - Google Patents
CA anti-frequency multiplication interference circuit, radio frequency circuit and communication equipment Download PDFInfo
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- H—ELECTRICITY
- 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
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Abstract
The invention discloses a CA anti-frequency multiplication interference circuit, a radio frequency circuit and communication equipment, wherein the CA anti-frequency multiplication interference circuit comprises: the antenna comprises a radio frequency transceiving module, an antenna switch module, at least one low-frequency transmission module, at least one medium-high frequency transmission module and at least one third frequency band transmission module; the antenna switch module receives or sends the low-frequency signal or the medium-high frequency signal through an antenna, the low-frequency output module transmits the low-frequency signal, the medium-high frequency transmission module transmits the medium-high frequency signal, and the radio frequency transceiver module receives or sends the low-frequency signal or the medium-high frequency signal; the third frequency band transmission module performs circuit switching to discharge the frequency multiplication interference signal to the ground; or transmitting the low-frequency signal or the middle high-frequency signal by the third frequency band transmission module. According to the invention, the frequency multiplication interference signal is released through the third frequency band transmission module, so that the frequency multiplication interference generated by signal coupling between circuits is reduced.
Description
Technical Field
The invention relates to the field of radio frequency transmission, in particular to a CA (carrier aggregation) anti-frequency-multiplication interference circuit, a radio frequency circuit and communication equipment.
Background
Currently, in order to meet the requirement of single-user peak rate and system capacity improvement, Carrier Aggregation (CA) is generally adopted in LTE-a technology.
In the prior art, when a CA combination in a certain specific frequency band works, and a low frequency works as a Primary Carrier unit (PCC), the harmonic margin thereof interferes with a medium-high frequency receiving frequency which is just at a frequency multiple point of a Secondary Carrier unit (SCC), thereby generating frequency multiplication interference, which results in a large reduction in the receiving performance under the CA work.
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 CA anti-frequency-doubling interference circuit, a radio frequency circuit, and a communication device, which bleed off a frequency-doubling interference signal through a third frequency band transmission module, so as to reduce frequency-doubling interference generated by signal coupling between lines.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a CA anti-frequency multiplication interference circuit, which comprises: the antenna comprises a radio frequency transceiving module, an antenna switch module, at least one low-frequency transmission module, at least one medium-high frequency transmission module and at least one third frequency band transmission module; the antenna switch module receives or sends the low-frequency signal or the medium-high frequency signal through an antenna, the low-frequency output module transmits the low-frequency signal, the medium-high frequency transmission module transmits the medium-high frequency signal, and the radio frequency transceiver module receives or sends the low-frequency signal or the medium-high frequency signal; the third frequency band transmission module performs circuit switching to discharge the frequency multiplication interference signal to the ground; or transmitting the low-frequency signal or the middle high-frequency signal by the third frequency band transmission module.
Further, the CA anti-multiple frequency interference circuit further includes an amplifying module, and the amplifying module amplifies the low frequency signal or the medium-high frequency signal and outputs the amplified signal to the low frequency transmission module, the medium-high frequency transmission module, or the third frequency band transmission module.
Further, the low frequency transmission module includes: and the low-frequency transmission unit is connected with the radio-frequency transceiving module and the amplifying module and is used for transmitting low-frequency signals.
Further, the low frequency transmission module further includes: and the low-pass filter is connected with the low-frequency transmission unit and the antenna switch module and is used for inhibiting frequency multiplication interference signals.
Further, the medium-high frequency transmission module includes: and the medium-high frequency transmission unit is connected with the radio frequency transceiving module and the amplifying module and is used for transmitting medium-high frequency signals.
Further, the third frequency band transmission module includes a third frequency band transmission unit, and the third frequency band transmission unit transmits the low frequency signal or the medium-high frequency signal output by the amplification module to the antenna switch module, or the third frequency band transmission unit receives the low frequency signal or the medium-high frequency signal from the antenna switch module and transmits the low frequency signal or the medium-high frequency signal to the radio frequency transceiver module.
Further, the third frequency band transmission module further includes: and the first switch is connected with the antenna module and the third frequency band transmission unit and is used for switching lines to release frequency doubling interference signals or switching on a loop of the third frequency band transmission unit.
Further, the third frequency band transmission module further includes: and the second switch is connected with the amplifying module and the third frequency band transmission unit and used for switching a circuit to discharge the frequency doubling interference signal or switching on a loop of the third frequency band transmission unit.
Based on the above CA anti-multiple frequency interference circuit, the present invention further provides a radio frequency circuit, including an antenna for receiving or transmitting a low frequency signal or a medium high frequency signal, and the CA anti-multiple frequency interference circuit as described above, where the antenna is connected to the antenna switch module.
Based on the above CA anti-frequency-multiplication interference circuit, the present invention further provides a communication device, which is characterized by comprising a device body, wherein the device body is provided with a circuit board, and the circuit board is provided with the above radio frequency circuit.
Compared with the prior art, the CA anti-double frequency interference circuit, the radio frequency circuit and the communication equipment provided by the invention comprise: the antenna comprises a radio frequency transceiving module, an antenna switch module, at least one low-frequency transmission module, at least one medium-high frequency transmission module and at least one third frequency band transmission module; the antenna switch module receives or sends the low-frequency signal or the medium-high frequency signal through an antenna, the low-frequency output module transmits the low-frequency signal, the medium-high frequency transmission module transmits the medium-high frequency signal, and the radio frequency transceiver module receives or sends the low-frequency signal or the medium-high frequency signal; the third frequency band transmission module performs circuit switching to discharge the frequency multiplication interference signal to the ground; or transmitting the low-frequency signal or the middle high-frequency signal by the third frequency band transmission module. According to the invention, the frequency multiplication interference signal is released through the third frequency band transmission module, so that the frequency multiplication interference generated by signal coupling between circuits is reduced.
Drawings
FIG. 1 is a block diagram of a CA anti-double frequency interference circuit according to the present invention;
fig. 2 is a specific structural block diagram of the CA anti-double frequency interference circuit provided in the present invention.
Detailed Description
In view of the problems in the prior art, the invention provides a CA anti-frequency-multiplication interference circuit, a radio frequency circuit and a communication device, wherein a third frequency band transmission module is used for releasing frequency-multiplication interference signals, so that frequency-multiplication interference generated by signal coupling between lines is reduced.
In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, 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 is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when …" or "upon" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted depending on the context to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced otherwise than as specifically described and similarly intended by those of ordinary skill in the art without departing from the spirit of the present invention, which is not limited to the specific embodiments disclosed below.
The embodiments of the present invention are intended to explain technical concepts of the present invention, technical problems to be solved, technical features constituting technical solutions, and technical effects to be brought about in more detail. The embodiments are explained below, but the scope of the present invention is not limited thereto. Further, the technical features of the embodiments described below may be combined with each other as long as they do not conflict with each other.
Currently, Carrier Aggregation (CA) is a key technology in LTE-a. To meet the peak rate per user and system capacity increase, one of the most straightforward approaches is to increase the system transmission bandwidth. Therefore, the LTE-Advanced system introduces a technique of increasing a transmission bandwidth, that is, CA (Carrier Aggregation). In the radio frequency CA (carrier aggregation) circuit design, attention is usually paid to the circuit design of the frequency multiplication interference CA, and if the circuit design is not good, the sensitivity of the frequency multiplication point in the CA working mode is poor.
Carrier aggregaTIon (Carrier aggregaTIon) is used in LTE-Advanced to increase the signal bandwidth, thereby increasing the transmission bit rate. In order to meet the requirements of the LTE-a for the downlink peak speed of 1Gbps and the uplink peak speed of 500Mbps, the transmission bandwidth of 100MHz at the maximum needs to be provided, but due to the scarcity of continuous spectrum with such a large bandwidth, the LTE-a proposes a solution of carrier aggregation. Carrier AggregaTIon (CA) is the AggregaTIon of 2 or more Carrier units (CCs) to support a larger transmission bandwidth (up to 100 MHz). The maximum bandwidth per CC is 20 MHz. To efficiently utilize fragmented spectrum, CAs supports CCs aggregating the same or different bandwidths among different CCs, CCs within the same frequency band, contiguous or non-contiguous CCs, CCs within different frequency bands.
If an independent duplexer is designed for each frequency band, ensuring that the frequency band of a downlink is not influenced; connecting the two duplexer paths, however, may affect the filter characteristics of the two duplexers, causing you to lose the isolation between the transmit and receive paths needed to operate with system sensitivity requirements.
In some CA cases with a large frequency separation between the two bands (e.g., CA combinations between mid and low bands), a separate duplexer may be added. A diplexer (diplexer or diplexer) is inserted between the antenna and the two band-separated dedicated duplexers.
While in the CA architecture, some designers are using multiplexers and hexiplexers instead of duplexers. If a multiplexer (multiplexer) is required, each individual filter within the device requires complex development because it is not as simple as placing two filters in one package, as we expect that they will work as a unified whole within the device. The designer must ensure that the filters of each band work together in a multiplexer (multiplexer). While the development of a multiplexer (multiplexer) is more challenging, it simplifies the work of the RF front-end designer and increases the available PC board area. The following figure depicts a simple front end showing duplexers (duplexers) and diplexers (diplexer or diplexer).
Description of CA frequency multiplication interference: when the low frequency band works as a PCC band in the CA working mode, if the receiving frequency of the frequency band in the SCC is just at the frequency doubling harmonic point of the PCC frequency band, the frequency band harmonic of the PCC may interfere with the receiving performance of the SCC frequency band, and the direct influence is that the sensitivity of the SCC may be deteriorated, and the network speed in the CA working mode is not good.
In the prior art, when a CA combination in a certain specific frequency band works, when a low frequency works as a Primary Carrier unit (PCC), the harmonic margin thereof interferes with a medium-high frequency receiving frequency which is just located at a frequency doubling point of a Secondary Carrier unit (SCC), thereby generating a frequency doubling interference problem, which may result in a large discount on the receiving performance under the working of the CA. Therefore, a better CA anti-double frequency interference circuit is needed.
CA combinations of common CA doubling interference are as follows:
CA_1A_28A；CA_4A_12A；CA_3A_8A；CA_7A_8A；CA_12A_66A。
the frequency band frequency table is as follows:
the harmonic frequencies of the LB are shown in the following table:
as shown in the following table, in the CA operating mode, the relationship between frequency multiplication interference when LB is PCC and MHB is SCC is shown:
in order to solve the problems in the prior art, referring to fig. 1, the present invention provides a CA anti-aliasing circuit, which includes: the radio frequency transceiver module 30, the antenna switch module 20, at least one low frequency transmission module 40, at least one medium-high frequency transmission module 60, and at least one third frequency band transmission module 50. The radio frequency transceiver module 30 is respectively connected to the low frequency transmission module 40, the medium-high frequency transmission module 60 and the third frequency band transmission module 50, the low frequency transmission module 40, the medium-high frequency transmission module 60 and the third frequency band transmission module 50 are further connected to the antenna switch module 20, and the antenna switch module 20 is further connected to the antenna 10.
In specific implementation, the antenna switch module 20 receives or transmits the low-frequency signal or the medium-high frequency signal through the antenna 10, the low-frequency output module transmits the low-frequency signal, the medium-high frequency transmission module 60 transmits the medium-high frequency signal, and the radio frequency transceiver module 30 receives or transmits the low-frequency signal or the medium-high frequency signal. When the frequency doubling interference occurs, the third frequency band transmission module 50 performs line switching to discharge the frequency doubling interference signal to the ground; when there is no double frequency interference, the third band transmission module 50 transmits a low frequency signal or a middle or high frequency signal. In the embodiment of the invention, when frequency multiplication interference occurs, the frequency multiplication interference signal is released through the third frequency band transmission module 50, so that the frequency multiplication interference generated by signal coupling between lines is reduced. Specifically, the antenna switch module 20 includes an ASM switch and/or a TXM switch.
Further, please refer to fig. 1, the CA anti-aliasing interference circuit further includes an amplifying module 70, wherein the amplifying module 70 amplifies the low frequency signal or the medium-high frequency signal and outputs the amplified signal to the low frequency transmission module 40, the medium-high frequency transmission module 60, or the third frequency band transmission module 50. The amplifying module 70 is connected to the rf transceiver module 30, the low frequency transmission module 40, the medium and high frequency transmission module 60, and the third frequency band transmission module 50.
In specific implementation, in this embodiment, the amplifying module 70 is configured to amplify the radio frequency signals output by the radio frequency transceiver module 30, select corresponding transmission modules to perform signal transmission according to needs, output the signals to the antenna switch module 20, and transmit corresponding radio frequency signals through the antenna 10 by the antenna switch module 20. For example, if the signal is a low-frequency radio frequency signal, the signal is output through the low-frequency transmission module 40, if the signal is a medium-high frequency signal, the signal is output through the medium-high frequency transmission module 60, and when a bandwidth needs to be increased, a plurality of transmission modules are selected for signal transmission through a carrier aggregation technology, which is not described in detail in the prior art.
Further, referring to fig. 2, the low frequency transmission module 40 includes: and a low frequency transmission unit 41 connected to the radio frequency transceiver module 30 and the amplification module 70 for transmitting low frequency signals.
In specific implementation, in the CA operating mode, in this embodiment, a plurality of different lines are generally required to obtain carrier signals in different frequency bands, and then the carrier signals are aggregated into a signal with a wider frequency spectrum through the antenna switch module 20 to be output, and the low-frequency transmission unit 41 is responsible for transmission of low-frequency signals. By low frequency signal is generally meant a radio frequency signal (i.e. LB) in the frequency band between 700 and 1000MHZ, and in this frequency band is artificially divided into a plurality of frequency bands, each frequency band specifically dividing the corresponding frequency range of the signal. After the amplification module 70 amplifies the corresponding radio frequency signal, the low frequency transmission unit 41 to which the corresponding frequency band belongs is selected as needed for transmission, where the number of the low frequency transmission units 41 may be one or more, and each low frequency transmission unit 41 represents a corresponding frequency band, and may be specifically set as needed, which is not limited herein.
Further, referring to fig. 2, the low frequency transmission module 40 further includes: and the low-pass filter 42 is connected with the low-frequency transmission unit 41 and the antenna switch module 20 and is used for suppressing frequency multiplication interference signals.
In specific implementation, in this embodiment, when the circuit design of the frequency doubling CA combination is considered, the requirement of suppressing the harmonic isolation of the circuit in the low frequency band is considered, so that the harmonic generated by the PCC operation on the conductive link is prevented from being coupled to the circuit at the medium-high frequency receiving end through the switch such as the ASM or TXM. Therefore, a low-pass filter 42 is added to the low-frequency circuit, and the frequency multiplication harmonic component is suppressed by the low-pass filter 42, so that the frequency multiplication interference is reduced.
Further, with continuing reference to fig. 2, the medium-high frequency transmission module 60 includes: and a middle-high frequency transmission unit 61 connected to the radio frequency transceiver module 30 and the amplifying module 70 and used for transmitting the middle-high frequency signal.
In a specific implementation, in this embodiment, the medium-high frequency transmission unit 61 is responsible for transmitting medium-high frequency signals. The medium-high frequency (MHB) can be divided into an intermediate frequency (MB) and a high frequency (HB), wherein the frequency of the intermediate frequency signal is between 1500-2200MHZ, and the frequency of the high frequency signal is between 2300-2700 MHZ. Similarly, the middle-high frequency band is also divided into a plurality of frequency bands, and each frequency band specifically divides a corresponding signal frequency range. After the amplification module 70 amplifies the corresponding radio frequency signal, the medium-high frequency transmission unit 61 to which the corresponding frequency band belongs is selected as needed for transmission, the number of the medium-high frequency transmission units 61 may be one or more, each low frequency transmission unit 41 represents a corresponding frequency band, and the setting may be specifically performed as needed, which is not limited herein.
Further, referring to fig. 2, the third band transmission module 50 includes a third band transmission unit 51, and the third band transmission unit 51 transmits the low frequency signal or the medium-high frequency signal output by the amplifying module 70 to the antenna switch module 20, or the third band transmission unit 51 receives the low frequency signal or the medium-high frequency signal from the antenna switch module 20 and transmits the low frequency signal or the medium-high frequency signal to the radio frequency transceiver module 30.
In this embodiment, the third band transmission module 50 is a third band working path except for the low-frequency band working path of the PCC and the middle-high frequency working transmission path in the CA working mode, and the third band transmission module 50 is used to transmit the radio frequency signal in the extra band. Specifically, the radio frequency signals of the extra frequency band are transmitted through the third frequency band transmission unit 51.
It should be noted that the low frequency transmission unit 41, the medium and high frequency transmission unit 61, and the third frequency band transmission unit 51 may be a duplexer or a filter, and those skilled in the art may make corresponding selections according to specific circuit requirements, which is not limited herein.
Further, referring to fig. 2, the third band transmission module 50 further includes: and a first switch 52 connected to the antenna switch module 20 and the third band transmission unit 51, and configured to perform line switching to discharge the frequency-doubled interference signal or to switch on a loop of the third band transmission unit 51.
In practical application, even though the low-pass filter 42 is disposed in the low-frequency transmission module 40 to suppress the double frequency interference, when the amplification module 70(MMPA) operates, other MMPA ports may also couple out harmonic components of the LB, and at this time, the unnecessary harmonic components may pass through the third operating path (i.e., the third band transmission module 50 in this embodiment), and then radiate out through the TXM switch, the ASM switch, or through the DUP (duplexer or filter) itself to interfere with the performance of the MHB receiving circuit.
Therefore, in this embodiment, a first switch 52 is disposed in the third band transmission module 50, the first switch 52 is disposed between the antenna switch module 20 and the third band transmission unit 51, one end of the first switch 52 is connected to the third band transmission unit 51, a second end of the first switch 52 is connected to the antenna 10 switch module 20, a third end of the first switch 52 is grounded, a first end of the first switch 52 is a fixed end, and a second end and a third end of the first switch 52 are movable ends. When the low frequency transmission module 40 is selected to operate as the PCC in the CA mode, at this time, if the SCC is a frequency doubling receiving frequency band of the low frequency transmission module 40, when a harmonic generated by the operation of the low frequency transmission module 40 may interfere with the receiving performance of the MB or HB through a third party path, the first end and the third end of the first switch 52 are turned on, the first end and the second end of the first switch 52 are turned off, and the first switch 52 is switched to the ground. At this moment, by leading the harmonic margin to the ground, in general, the isolation between the two active terminals of the first switch 52 is 25db, so that the harmonic interference margin can be greatly reduced to the SCC receiving path. Optionally, the first switch 52 is a single-pole double-throw switch (i.e., SPDT), and may also be another type of switch, which only needs to implement a corresponding switching function.
Further, referring to fig. 2, the third band transmission module 50 further includes: and a second switch 53 connected to the amplifying module 70 and the third band transmission unit 51, and configured to perform line switching to discharge the frequency-doubled interference signal or to switch on a loop of the third band transmission unit 51.
In specific implementation, in this embodiment, the second switch 53 is identical to the first switch 52 in type and specification, but is disposed at a different position from the first switch 52. The second switch 53 is an optional example, the second switch 53 is disposed between the third frequency band transmission unit 51 and the amplification module 70, and when the low frequency transmission module 40 is selected to operate as the PCC in the CA mode, at this time, if the SCC is a frequency doubling reception frequency band of the low frequency transmission module 40, when a harmonic generated by the operation of the low frequency transmission module 40 may interfere with the reception performance of the MB or HB through a third path, the first terminal and the third terminal of the first switch 52 are turned on, the first terminal and the second terminal of the first switch 52 are turned off, and the first switch 52 is switched to the ground. The second switch 53 is set, so that the leakage of the harmonic margin can be realized, and the possibility of the harmonic interference margin on the SCC receiving path is reduced.
In addition, the first switch 52 and the second switch 53 may be disposed in the third band transmission module 50 at the same time, so as to form a double leakage of the harmonic margin, thereby avoiding a situation where a small amount of harmonic margin is still coupled to the third band transmission unit 51 or the antenna switch module 20 after a single leakage.
Based on the above CA anti-multiple frequency interference circuit, the present invention further provides a radio frequency circuit, which includes an antenna 10 for receiving or transmitting a low frequency signal or a middle and high frequency signal, and the CA anti-multiple frequency interference circuit as described above, where the antenna 10 is connected to the antenna switch module 20.
In a specific implementation, in the radio frequency CA mode, in the embodiment, when a signal needs to be transmitted, the radio frequency transceiver module 30 transmits a radio frequency signal, which is amplified by the amplifying module 70 and then output by a corresponding transmission module, for example, the low frequency transmission module 40 transmits a radio frequency signal in a low frequency band, the medium and high frequency transmission module 60 transmits a radio frequency signal in a medium and high frequency band, and the antenna switch module 20 transmits the radio frequency signal through the antenna 10. When a signal needs to be received, the antenna switch module 20 receives a radio frequency signal through the antenna 10, and transmits the radio frequency signal of a corresponding frequency band to the radio frequency transceiver module 30 through a corresponding transmission module.
In the above process, when the middle high frequency transmission module 60 transmits the frequency doubling signal of the low frequency transmission module 40, the third frequency band transmission module 50 is grounded, and the frequency doubling interference signal is discharged to the ground; when the middle/high frequency transmission module 60 transmits a frequency-doubled signal that is not the frequency-doubled signal of the low frequency transmission module 40, the third frequency band transmission module 50 transmits a corresponding rf signal to the antenna switch module 20 or the rf transceiver module 30 as required. Since the CA anti-double frequency interference circuit is described in detail above, it is not described herein again.
Based on the CA anti-frequency multiplication interference circuit, the invention also provides communication equipment which comprises an equipment body, wherein the equipment body is internally provided with a circuit board, and the circuit board is provided with the radio frequency circuit. Since the CA anti-double frequency interference circuit and the radio frequency circuit are both described in detail above, they are not described in detail herein.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned functions may be distributed as different functional units and modules according to needs, that is, the internal structure of the apparatus may be divided into different functional units or modules to implement all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
Furthermore, those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the above modules or units is only one logical division, and the actual implementation may be implemented by another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. The specific processes loaded and executed by the storage medium and the instruction processors in the mobile terminal are described in detail in the method, and are not described herein.
In summary, the present invention provides a CA anti-multiple frequency interference circuit, a radio frequency circuit and a communication device, where the CA anti-multiple frequency interference circuit includes: the antenna comprises a radio frequency transceiving module, an antenna switch module, at least one low-frequency transmission module, at least one medium-high frequency transmission module and at least one third frequency band transmission module; the antenna switch module receives or sends the low-frequency signal or the medium-high frequency signal through an antenna, the low-frequency output module transmits the low-frequency signal, the medium-high frequency transmission module transmits the medium-high frequency signal, and the radio frequency transceiver module receives or sends the low-frequency signal or the medium-high frequency signal; the third frequency band transmission module performs circuit switching to discharge the frequency multiplication interference signal to the ground; or transmitting the low-frequency signal or the middle high-frequency signal by the third frequency band transmission module. According to the invention, the frequency multiplication interference signal is released through the third frequency band transmission module, so that the frequency multiplication interference generated by signal coupling between circuits is reduced.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A Carrier Aggregation (CA) anti-aliasing interference circuit, the CA anti-aliasing interference circuit comprising: the antenna comprises a radio frequency transceiving module, an antenna switch module, at least one low-frequency transmission module, at least one medium-high frequency transmission module and at least one third frequency band transmission module; the antenna switch module receives or sends a low-frequency signal or a medium-high frequency signal through an antenna, the low-frequency transmission module transmits the low-frequency signal, the medium-high frequency transmission module transmits the medium-high frequency signal, and the radio frequency transceiver module receives or sends the low-frequency signal or the medium-high frequency signal;
when the frequency of the medium-high frequency signal is at a frequency doubling harmonic point of the low-frequency signal, the harmonic of the low-frequency signal transmitted by the low-frequency transmission module is used as a frequency doubling interference signal;
the third frequency band transmission module is used for switching lines, receiving the frequency multiplication interference signal and discharging the frequency multiplication interference signal to the ground, or the third frequency band transmission module is used for transmitting a low-frequency signal or a medium-high frequency signal;
the CA anti-double frequency interference circuit further comprises an amplifying module, wherein the amplifying module amplifies the low-frequency signal or the medium-high frequency signal received by the radio frequency transceiver module and outputs the amplified signal to the low-frequency transmission module, the medium-high frequency transmission module or the third frequency band transmission module;
the third frequency band transmission module comprises a third frequency band transmission unit, and the third frequency band transmission unit transmits the low-frequency signal or the medium-high frequency signal output by the amplification module to the antenna switch module, or transmits the low-frequency signal or the medium-high frequency signal received by the antenna switch module from the third frequency band transmission unit to the radio frequency transceiver module;
the third frequency band transmission module further includes: a first switch connected to the antenna switch module and the third band transmission unit, and configured to perform line switching to bleed off a double-frequency interference signal or to switch on a loop of the third band transmission unit, where one end of the first switch is connected to the third band transmission unit, a second end of the first switch is connected to the antenna switch module, a third end of the first switch is grounded, a first end of the first switch is a fixed end, and a second end and a third end of the first switch are movable ends;
the third frequency band transmission module further includes: and the second switch is connected with the amplifying module and the third frequency band transmission unit and used for switching a line to discharge a frequency doubling interference signal or switching on a loop of the third frequency band transmission unit, one end of the second switch is connected with the amplifying module, the second end of the second switch is connected with the third frequency band transmission unit, the third end of the second switch is grounded, the first end of the second switch is a fixed end, and the second end and the third end of the second switch are movable ends.
2. The CA anti-aliasing interference circuit of claim 1, wherein the low frequency transmission module comprises: and the low-frequency transmission unit is connected with the radio-frequency transceiving module and the amplifying module and is used for transmitting low-frequency signals.
3. The CA anti-aliasing interference circuit of claim 2, wherein the low frequency transmission module further comprises:
and the low-pass filter is connected with the low-frequency transmission unit and the antenna switch module and is used for inhibiting frequency multiplication interference signals.
4. The CA anti-aliasing interference circuit of claim 1, wherein the medium-high frequency transmission module comprises:
and the medium-high frequency transmission unit is connected with the radio frequency transceiving module and the amplifying module and is used for transmitting medium-high frequency signals.
5. A radio frequency circuit comprising an antenna for receiving or transmitting a low frequency signal or a medium high frequency signal, and the CA anti-aliasing circuit of any of claims 1-4, the antenna being connected to the antenna switch module.
6. A communication device comprising a device body having a circuit board disposed therein, the circuit board having the radio frequency circuit of claim 5 disposed thereon.
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| CN202110072742.5A CN112886979B (en) | 2021-01-19 | 2021-01-19 | CA anti-frequency multiplication interference circuit, radio frequency circuit and communication equipment |
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| CN202110072742.5A CN112886979B (en) | 2021-01-19 | 2021-01-19 | CA anti-frequency multiplication interference circuit, radio frequency circuit and communication equipment |
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| CN113676214B (en) * | 2021-08-12 | 2022-07-15 | Oppo广东移动通信有限公司 | Amplifier module, radio frequency system and communication equipment |
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| CN107852135A (en) * | 2015-08-04 | 2018-03-27 | 高通股份有限公司 | Circuit occurs for the local oscillator signals with current harmonics elimination |
| CN109714079A (en) * | 2019-03-07 | 2019-05-03 | 上海希形科技有限公司 | Power line carrier communication anti-jamming circuit |
| WO2020155805A1 (en) * | 2019-01-28 | 2020-08-06 | 惠州Tcl移动通信有限公司 | Carrier aggregation apparatus and terminal device |
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| CN201590814U (en) * | 2009-12-29 | 2010-09-22 | 芯通科技（成都）有限公司 | RF (Radio Frequency) transmission link structure with even harmonic suppression function |
| CN104242975B (en) * | 2013-06-09 | 2018-04-10 | 中兴通讯股份有限公司 | Communication terminal and the method for reducing communication terminal interference |
| KR101981513B1 (en) * | 2015-07-17 | 2019-05-23 | 가부시키가이샤 무라타 세이사쿠쇼 | Front End Module |
| CN106059598B (en) * | 2016-05-03 | 2018-05-18 | 广东欧珀移动通信有限公司 | Anti- harmonic wave interference device, antenna assembly and the mobile terminal of a kind of carrier aggregation |
| CN108718219B (en) * | 2016-05-23 | 2020-08-04 | Oppo广东移动通信有限公司 | Anti-harmonic interference device for carrier aggregation, antenna device and mobile terminal |
| CN106301462B (en) * | 2016-08-02 | 2017-08-25 | 广东欧珀移动通信有限公司 | Radio frequency control circuit and mobile terminal |
| CN208539895U (en) * | 2018-07-26 | 2019-02-22 | 维沃移动通信有限公司 | A kind of anti-jamming circuit and mobile terminal |
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| CN107852135A (en) * | 2015-08-04 | 2018-03-27 | 高通股份有限公司 | Circuit occurs for the local oscillator signals with current harmonics elimination |
| WO2020155805A1 (en) * | 2019-01-28 | 2020-08-06 | 惠州Tcl移动通信有限公司 | Carrier aggregation apparatus and terminal device |
| CN109714079A (en) * | 2019-03-07 | 2019-05-03 | 上海希形科技有限公司 | Power line carrier communication anti-jamming circuit |
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