CN106849981B - Base station radio frequency signal transceiving circuit, radio frequency transmitting circuit and signal transmitting method - Google Patents
Base station radio frequency signal transceiving circuit, radio frequency transmitting circuit and signal transmitting method Download PDFInfo
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- CN106849981B CN106849981B CN201611178383.7A CN201611178383A CN106849981B CN 106849981 B CN106849981 B CN 106849981B CN 201611178383 A CN201611178383 A CN 201611178383A CN 106849981 B CN106849981 B CN 106849981B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0067—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0458—Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
Abstract
The invention provides a base station radio frequency signal transceiver circuit, a radio frequency transmitting circuit and a signal transmitting method, wherein a radio frequency input connector is connected with an output radio frequency connector through at least two stages of power amplifiers; the working frequency of each stage of power amplifier comprises at least two transmitting radio frequency signal frequency bands. When multi-band radio frequency communication is needed, the amplification of a plurality of transmitting radio frequency signals can be realized only by the working frequency of each stage of power amplifier containing a plurality of transmitting radio frequency signal frequency bands, so that the multi-band radio frequency communication is realized. When the multi-band radio frequency communication is realized, a plurality of radio frequency modules are not required to be arranged, and the functions of the plurality of radio frequency modules are integrated into one radio frequency amplification link to be realized, so that the circuit volume is reduced; meanwhile, due to the fact that multi-band radio frequency communication is achieved through one radio frequency amplification link, an additional radio frequency module is not needed, and therefore compared with the existing multi-band radio frequency communication achieving mode, the heat productivity is reduced, and meanwhile the overall efficiency of the circuit is improved.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to a base station radio frequency signal receiving and transmitting circuit, a radio frequency transmitting circuit and a signal transmitting method.
Background
With the continuous development of wireless communication, the coverage area of the current communication network completely covers 2G, 3G, 4G and other mobile communication networks. Meanwhile, the demand for wireless communication is also increasing, for example, in some small and home base station applications, radio frequency communication requirements meeting multiple frequency bands simultaneously are usually proposed.
Currently, the conventional way to implement radio frequency communication satisfying multiple frequency bands simultaneously is: meanwhile, a plurality of radio frequency modules are adopted, and each radio frequency module realizes radio frequency communication of one frequency band, so that the radio frequency communication of a plurality of frequency bands is realized through the plurality of radio frequency modules. However, radio frequency communication of multiple frequency bands is realized by the method, and each time a frequency band is added, a corresponding radio frequency transceiver module needs to be added, which inevitably results in a larger circuit size and inconvenience in carrying; meanwhile, as the plurality of radio frequency modules work simultaneously, the overall efficiency of the circuit is inevitably reduced, and the heat productivity is increased.
Disclosure of Invention
The invention provides a base station radio frequency signal transceiving circuit, a radio frequency transmitting circuit and a signal transmitting method, which aim to solve the problems that the existing mode for realizing radio frequency communication meeting multiple frequency bands simultaneously needs to adopt a plurality of radio frequency modules, so that the circuit is large in size and inconvenient to carry; meanwhile, as the plurality of radio frequency modules work simultaneously, the overall efficiency of the circuit is inevitably reduced, and the heat productivity is increased.
In order to solve the above technical problem, the present invention provides a base station radio frequency transmitting circuit, which comprises a radio frequency input connector, an output radio frequency connector and at least two stages of power amplifiers connected in sequence; the radio frequency input connector is connected with the input end of a first-stage power amplifier in the at least two stages of power amplifiers, and the output radio frequency connector is connected with the output end of a last-stage power amplifier in the at least two stages of power amplifiers;
the working frequency of each stage of power amplifier comprises at least two transmitting radio frequency signal frequency bands;
the radio frequency input connector is used for receiving the transmitting radio frequency signals with the frequency bands in the at least two transmitting radio frequency signal frequency bands, amplifying the transmitting radio frequency signals by the at least two stages of power amplifiers in sequence and then transmitting the amplified transmitting radio frequency signals through the output radio frequency connector.
Furthermore, the working frequency of each stage of power amplifier comprises three frequency bands for transmitting radio frequency signals.
Further, the working frequency of each stage of power amplifier is 1.8GHz to 2.7 GHz.
Further, the base station radio frequency transmitting circuit further comprises a coupler connected between the output end of the last stage power amplifier and the input end of the output radio frequency connector;
and the coupler is used for performing coupling processing on the transmitted radio frequency signal amplified by the last stage of power amplifier and outputting the processed transmitted radio frequency signal to the output radio frequency connector.
Further, at least one of the at least two stages of power amplifiers is a Doherty (Doherty) power amplifier.
Further, the base station radio frequency transmitting circuit comprises a first-stage power amplifier, a second-stage power amplifier and a third-stage power amplifier which are connected in sequence, wherein the third-stage power amplifier is a Doherty power amplifier.
The invention also provides a base station radio frequency signal transceiver circuit, which comprises a radio frequency signal receiving circuit and any one of the base station radio frequency transmitting circuits;
the radio frequency signal receiving circuit comprises a low noise amplifier connected with the output radio frequency connector and a radio frequency output connector connected with the output end of the low noise amplifier;
the output radio frequency connector is used for amplifying the received radio frequency signals through the low noise amplifier and then outputting the signals through the radio frequency output connector.
Further, the base station radio frequency signal transceiver circuit further comprises a band-pass filter connected between the low noise amplifier and the radio frequency output connector, wherein the band-pass filter is used for filtering the received radio frequency signal amplified by the low noise amplifier and then outputting the filtered received radio frequency signal to the radio frequency output connector.
Further, the base station radio frequency signal transceiver circuit further comprises a mode control circuit, wherein the mode control circuit comprises a mode selection switch and a mode control switch;
the mode control switch comprises a TDD (Time Division duplex) mode control switch and an FDD (Frequency Division duplex) mode control switch; the TDD mode control switch comprises a TDD mode transmitting control sub-switch and a TDD mode receiving control sub-switch;
one side of the mode selection switch is connected with the output radio frequency connector, the other side of the mode selection switch is respectively connected with the TDD mode control switch and the FDD mode control switch, a TDD mode transmitting control sub-switch and a TDD mode receiving control sub-switch of the TDD mode control switch are respectively connected with the output end of the last stage of power amplifier and the input end of the low noise amplifier, and the FDD mode control switch is connected with the output end of the last stage of power amplifier and the input end of the low noise amplifier;
the mode selection switch is used for selectively switching on the TDD mode control switch or the FDD mode control switch;
the TDD mode transmission control sub-switch of the TDD mode control switch is used for connecting the output end of the last stage power amplifier with the output radio frequency connector according to a transmission control signal; the TDD mode receiving control sub-switch is used for connecting the input end of the low noise amplifier with the output radio frequency connector according to a receiving control signal;
the FDD mode control switch is used for closing according to a receiving and sending control signal so as to connect the output end of the last stage of power amplifier and the input end of the low noise amplifier with the output radio frequency connector.
The invention also provides a signal sending method based on any one of the base station radio frequency transmitting circuits, which comprises the following steps:
and sequentially amplifying the radio-frequency signals to be transmitted by the at least two stages of power amplifiers and then transmitting the radio-frequency signals through the output radio-frequency connector, wherein the radio-frequency signals to be transmitted comprise radio-frequency signals of at least one frequency band in the at least two transmitting radio-frequency signal frequency bands.
Advantageous effects
The invention provides a base station radio frequency signal transceiver circuit, a radio frequency transmitting circuit and a signal transmitting method.A radio frequency input connector is connected with the input end of a first-stage power amplifier in at least two stages of power amplifiers which are sequentially connected, and an output radio frequency connector is connected with the output end of a last-stage power amplifier in the at least two stages of power amplifiers; the working frequency of each stage of power amplifier comprises at least two transmitting radio frequency signal frequency bands; thus, when the frequency band of the transmitted radio frequency signal is within the working frequency of each stage of power amplifier, the radio frequency input connector receives the transmitted radio frequency signal, and the transmitted radio frequency signal is sent out through the output radio frequency connector after the transmitted radio frequency signal is amplified by at least two stages of power amplifiers in sequence. That is, when multi-band radio frequency communication is required, the amplification of a plurality of transmitting radio frequency signals can be realized only by the working frequency of each stage of power amplifier including the plurality of transmitting radio frequency signal frequency bands and inputting the transmitting radio frequency signals of the plurality of transmitting radio frequency signal frequency bands into the radio frequency input connector together, thereby realizing the multi-band radio frequency communication. Therefore, when the multi-band radio frequency communication is realized, the circuit provided by the invention does not need to be provided with a plurality of radio frequency modules, but integrates the functions of the plurality of radio frequency modules into one radio frequency amplification link, so that the circuit volume is reduced, and because the multi-band radio frequency communication is realized through one radio frequency amplification link, no additional radio frequency module is needed to be added, the heat productivity is reduced and the overall efficiency of the circuit is improved compared with the existing multi-band radio frequency communication realization mode.
Drawings
Fig. 1 is a schematic structural diagram of a base station rf transmitting circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a specific base station rf transmitting circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a Doherty power amplifier according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a specific base station rf transmitting circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a base station rf signal transceiver circuit according to a second embodiment of the present invention;
fig. 6 is a schematic structural diagram of a radio frequency signal receiving circuit according to a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a base station rf signal transceiver circuit according to a second embodiment of the present invention;
fig. 8 is a schematic structural diagram of a specific base station rf signal transceiver circuit according to a third embodiment of the present invention;
fig. 9 is a flowchart illustrating a signal sending method according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.
Example one
Referring to fig. 1, fig. 1 is a schematic structural diagram of a base station rf transmitting circuit provided in this embodiment, including an rf input connector 11, a power amplifier 12, and an output rf connector 13, wherein:
at least two power amplifiers 12 are provided, and are connected in sequence to form at least two stages of power amplifiers, specifically, the output terminal of the power amplifier 12 of the previous stage is connected with the input terminal of the power amplifier 12 of the next stage. Meanwhile, the input end of the first stage power amplifier 12 is connected with the radio frequency input connector 11, and the output end of the last stage power amplifier 12 is connected with the output radio frequency connector 13.
In this embodiment, the working frequency of each stage of power amplifier 12 should include at least two frequency bands for transmitting radio frequency signals, and only when the frequency band for transmitting radio frequency signals is within the at least two frequency bands for transmitting radio frequency signals included in the working frequency of each stage of power amplifier 12, the transmitted radio frequency signals are received by the radio frequency input connector 11, sequentially amplified by each stage of power amplifier 12, and finally transmitted through the output radio frequency connector 13.
In this embodiment, the at least two stages of power amplifiers formed by the at least two power amplifiers 12 can ensure that the transmission radio frequency signal received by the radio frequency input connector 11 can meet the circuit output requirement after being amplified in multiple stages by the power amplifiers 12. It should be understood that the power amplifier, particularly the power amplifier with several stages, arranged in the circuit should be designed according to the practical requirements of engineering.
It should be noted that, in this embodiment, when there are a plurality of transmission rf signals with frequencies within at least two transmission rf signal frequency bands included in the operating frequencies of the power amplifiers 12 in each stage, the rf input connector 11 may receive the plurality of transmission rf signals at the same time, and deliver all the received transmission rf signals to the power amplifiers 12 in each stage for amplification processing, and send out through the output rf connector 13. That is, in this embodiment, the processing of multiple transmitted rf signals can be performed simultaneously.
For example, it is assumed that the operating frequency of each stage of the power amplifier 12 includes two transmitting radio frequency signal frequency bands, which are 1880MHz to 1920MHz and 2300MHz to 2400MHz, respectively; then the rf input connector 11 can simultaneously receive multiple transmitting rf signals with frequency ranges between 1880MHz to 1920MHz and between 2300MHz to 2400MHz, for example, the rf input connector 11 can simultaneously receive one transmitting rf signal with frequency ranges between 1880MHz to 1920MHz and one transmitting rf signal with frequency ranges between 2300MHz to 2400 MHz.
It should also be noted that in the present embodiment, the operating frequencies of the power amplifiers 12 of the respective stages may be the same. For example, the operating frequency of each stage of the power amplifier 12 may be 1880MHz to 2700MHz, that is, as long as the frequency band of the transmitted radio frequency signal is within 1880MHz to 2700MHz, the radio frequency input connector 11 may receive the radio frequency signal and deliver the radio frequency signal to each stage of the power amplifier 12 for amplification, for example, the radio frequency input connector 11 described in the above example may simultaneously receive the transmitted radio frequency signal with the frequency band of 1880MHz to 1920MHz and the transmitted radio frequency signal with the frequency band of 2300MHz to 2400 MHz.
In this embodiment, the operating frequencies of the power amplifiers 12 of each stage may also be different, and when the operating frequencies of the power amplifiers 12 of each stage are different, the operating frequencies of the power amplifiers 12 of each stage should include at least two identical frequency bands for transmitting the radio frequency signals. Taking two stages of power amplifiers as an example, the working frequency of the first stage power amplifier 12 may be 1.8GHz to 2.7GHz, the working frequency of the second stage power amplifier 12 is 1GHz to 2.4GHz, and the common working frequency band is 1.8GHz to 2.4GHz, that is, the working frequency of each stage of power amplifier 12 at least includes two transmitting radio frequency signal frequency bands of 1880MHz to 1920MHz and 2300MHz to 2400 MHz.
In fact, when designing each stage of power amplifier 12, the power amplifier with the working frequency meeting the actual engineering requirements can be selected for design according to the actual engineering requirements.
For example, when the wireless communication system is in the TDD operating mode of the 3G and 4G mobile communication networks, the frequency bands of the commonly used transmission radio frequency signals are 1880MHz to 1920MHz, 2300MHz to 2400MHz, and 2500MHz to 2700MHz, and at this time, the multi-stage power amplifier in this embodiment may be constructed by selecting a power amplifier whose operating frequency includes three frequency bands of the transmission radio frequency signals. Specifically, the operating frequencies of the power amplifiers 12 at each stage may be designed to include three transmitting radio frequency signal frequency bands of 1880MHz to 1920MHz, 2300MHz to 2400MHz, and 2500MHz to 2700MHz, so that as long as the transmitting radio frequency signals at the three frequency bands are input into the radio frequency input connector 11 together, the power amplifiers 12 at each stage connected in sequence may amplify the transmitting radio frequency signals at the three frequency bands, and the output radio frequency connector 13 may transmit the amplified transmitting radio frequency signals at the three frequency bands. Namely, the radio frequency communication of three frequency bands is simultaneously met in a TDD working mode of 3G and 4G mobile communication networks through one radio frequency transceiving link. It should be understood that the operating frequency of each stage of the power amplifier 12 may be 1.8GHz to 2.7GHz, so that three bands of the transmitted radio frequency signals can be completely covered.
It should be noted that, when the operating frequency of each stage of power amplifier in this embodiment includes three transmitting radio frequency signal frequency bands, the three transmitting radio frequency signal frequency bands should not be limited to the three transmitting radio frequency signal frequency bands shown in the above example, but may also be other frequency bands, which should be determined according to actual needs of engineering. Meanwhile, it should be understood that the operating frequency of each stage of the power amplifier in this embodiment is not limited to include three bands for transmitting radio frequency signals.
In this embodiment, the base station radio frequency transmitting circuit may further include a coupler to reduce circuit interference, and referring to fig. 2, the coupler 14 is connected between the output end of the last stage power amplifier 12 and the input end of the output radio frequency connector 13, and configured to couple the transmitted radio frequency signal amplified and transmitted by the last stage power amplifier 12, and then output the processed transmitted radio frequency signal to the output radio frequency connector 13 for transmission.
The power amplifier 12 in this embodiment may be a conventional power amplifier, or may be a power amplifier with a specific power efficiency composed of multiple sets of devices, such as a Doherty power amplifier.
In this embodiment, at least one stage of the at least two stages of power amplifiers 12 is a Doherty power amplifier, so as to improve the overall efficiency of the circuit, as shown in fig. 3. The Doherty power amplifier is composed of a power divider, power tubes G3 and G4, and a combiner, wherein one side of the power divider is used for receiving a transmitting radio frequency signal, the other side of the power divider is respectively connected with G3 and G4, one side of the combiner is respectively connected with G3 and G4, and the other side of the combiner is connected with a coupler 14 or an output radio frequency connector 13. Note that power tube G3 operates in class AB, and power tube G4 operates in class C.
The operation state and operation principle of the Doherty power amplifier in the present embodiment are explained as follows:
when the power divider receives low power of the transmitted radio frequency signal, only G3 works, and G4 is in an off state, when the efficiency of G3 reaches the maximum value, the efficiency of the Doherty structure reaches the first peak efficiency, and the input voltage at this time is called as the peak voltage.
When the power of the transmitted radio frequency signal received by the power divider is gradually increased, the output voltage of the G3 is kept saturated, and the G4 starts to work under the appropriate bias voltage, so that the active modulation effect appears. As the input power continues to increase, the output current of G4 increases while the output current of G3 continues to increase, and the G3 efficiency remains at a maximum. The Doherty power amplifier efficiency drops somewhat due to the fact that the G4 operating current does not reach a maximum, but remains at a higher level. Subsequently, as the input power continues to increase, G4 reaches saturation, at which time the output currents of G3 and G4 both reach a maximum value, the Doherty power amplifier reaches maximum power output, and the system efficiency also reaches the maximum efficiency value of a single ideal class B amplifier, i.e., the second peak efficiency, at which time the output of the Doherty power amplifier reaches a maximum.
It should be understood that the same power transistor can be selected for the G3 and the G4 in this embodiment, but two of the same power transistors need to be configured to operate in class AB and class C.
It should also be understood that, in this embodiment, a two-way balanced power supply design may be adopted for G3 and G4, that is, a balanced power supply design is adopted for the gate bias power supply circuit and the drain power supply circuit of G3 and G4, respectively, that is, the same voltage is provided for the gate and the drain of G3 and G4, respectively; or only the grid bias power supply circuit or the drain power supply circuit of G3 and G4 adopts a balanced power supply design.
In this embodiment, more than one Doherty power amplifiers may be provided, for example, three-stage power amplifiers are provided in the circuit, at this time, the second-stage power amplifier and the third-stage power amplifier may be provided as Doherty power amplifiers, and even all three power amplifiers of the three-stage power amplifiers may be provided as Doherty power amplifiers.
In this embodiment, it can be known from the operating principle of the Doherty power amplifier that the Doherty power amplifier can achieve the maximum output only when the power of the transmitted radio frequency signal input into the Doherty power amplifier is at a high level. Therefore, in order to ensure that the power of the transmitted rf signal input to the Doherty power amplifier can obtain a higher value and meet the requirements of the Doherty power amplifier, the Doherty power amplifier may be disposed at the rear end of the constructed at least two stages of power amplifiers and used as the last stage or stages of power amplifiers.
For example, referring to fig. 4, in the base station rf transmit circuit shown in fig. 4, the rf input connector 11 is connected to the output rf connector 13 through a three stage power amplifier. The first-stage power amplifier G1, the second-stage power amplifier G2 and the third-stage power amplifier in the three-stage power amplifier are sequentially connected, and the third-stage power amplifier is a Doherty power amplifier; meanwhile, the input end of the first stage power amplifier G1 is connected to the rf input connector 11, and the output side of the combiner of the Doherty power amplifier is connected to the output rf connector 13. In this way, after the rf input connector 11 receives the transmitted rf signal, power amplification can be performed sequentially through G1 and G2, thereby ensuring that the power of the transmitted rf signal input to the Doherty power amplifier is sufficiently high, and maximum efficiency and maximum output are achieved.
The base station radio frequency transmitting circuit provided by this embodiment is connected with the input end of the first-stage power amplifier in the at least two stages of power amplifiers connected in sequence through the radio frequency input connector, and the output radio frequency connector is connected with the output end of the last-stage power amplifier in the at least two stages of power amplifiers; the working frequency of each stage of power amplifier comprises at least two transmitting radio frequency signal frequency bands; thus, when the frequency band of the transmitted radio frequency signal is within the working frequency of each stage of power amplifier, the radio frequency input connector receives the transmitted radio frequency signal, and the transmitted radio frequency signal is sent out through the output radio frequency connector after the transmitted radio frequency signal is amplified by at least two stages of power amplifiers in sequence. That is, when multi-band radio frequency communication is required, the amplification of a plurality of transmitting radio frequency signals can be realized only by the working frequency of each stage of power amplifier including the plurality of transmitting radio frequency signal frequency bands and inputting the transmitting radio frequency signals of the plurality of transmitting radio frequency signal frequency bands into the radio frequency input connector together, thereby realizing the multi-band radio frequency communication. Therefore, when the multi-band radio frequency communication is realized, the circuit provided by the invention does not need to be provided with a plurality of radio frequency modules, but integrates the functions of the plurality of radio frequency modules into one radio frequency amplification link, so that the circuit volume is reduced, and because the multi-band radio frequency communication is realized through one radio frequency amplification link, no additional radio frequency module is needed to be added, the heat productivity is reduced and the overall efficiency of the circuit is improved compared with the existing multi-band radio frequency communication realization mode.
Example two
Referring to fig. 5, fig. 5 is a schematic structural diagram of a base station rf signal transceiver circuit provided in this embodiment, and the base station rf signal transceiver circuit is formed by a base station rf transmitting circuit and an rf signal receiving circuit shown in the first embodiment. Wherein:
the radio frequency signal receiving circuit is composed of an output radio frequency connector 13, a low noise amplifier 15 and a radio frequency output connector 16, specifically, the output radio frequency connector 13 is connected with the input end of the low noise amplifier 15, and the output end of the low noise amplifier 15 is connected with the radio frequency output connector 16.
It should be noted that in the rf signal receiving circuit, the output rf connector 13 is used for receiving the received rf signal and passing the received rf signal to the low noise amplifier 15 for amplification. The received radio frequency signal is amplified by the low noise amplifier 15 and then outputted through the radio frequency output connector 16.
In fact, in engineering applications, to ensure that the circuit can satisfy the adjacent channel rejection ratio, a band-pass filter can be selectively set according to the actual rejection requirements of the circuit. For example, referring to fig. 6, a band-pass filter 17 may be disposed between the low noise amplifier 15 and the radio frequency output connector 16, where the band-pass filter 17 is configured to perform filtering processing on the received radio frequency signal amplified by the low noise amplifier 15, and then output the received radio frequency signal after the filtering processing to the radio frequency output connector 16. Thus, through the effect of the band-pass filter, the received radio-frequency signals in the frequency range required by engineering application are passed, and the received radio-frequency signals in the frequency range not required are attenuated, so that the suppression of adjacent channels is improved, and the performance of a wireless communication system served by the circuit is improved.
It should be understood that in practical engineering applications, if the circuit can meet the practical suppression requirements of engineering applications without a band-pass filter, the band-pass filter may not be provided.
Meanwhile, in practical engineering applications, radio frequency communication often has two working modes, namely TDD and FDD, and in the radio frequency communication process, switching between the working mode of TDD and the working mode of FDD is often required, or the radio frequency communication system and the radio frequency communication system simultaneously work in the two working modes. Therefore, the base station radio frequency signal transceiver circuit can realize free switching between the TDD working mode and the FDD working mode through the circuit design, and even work simultaneously under the two working modes, the base station radio frequency signal transceiver circuit has great engineering application value.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a base station rf signal transceiving circuit provided on the basis of fig. 5, in which the circuits in the solid line frame are mode control circuits, the mode control circuits include a mode selection switch 71 and a mode control switch, where the mode control switch includes a TDD mode control switch and an FDD mode control switch 722; the TDD mode control switch includes a TDD mode transmission control sub-switch 7211 and a TDD mode reception control sub-switch 7212.
One side of the mode selection switch 71 is connected to the output rf connector 13, and the other side is connected to the TDD mode control switch and the FDD mode control switch 722, respectively, the TDD mode transmission control sub-switch 7211 and the TDD mode reception control sub-switch 7212 of the TDD mode control switch are connected to the output terminal of the last stage power amplifier 12 and the input terminal of the low noise amplifier 15, respectively, and the FDD mode control switch 722 is connected to the output terminal of the last stage power amplifier and the input terminal of the low noise amplifier 15.
It should be noted that in the present embodiment, the mode selection switch 71 is used for selectively turning on the TDD mode control switch or turning on the FDD mode control switch 722, that is, the mode selection switch 71 can select whether the circuit operates in the TDD mode or in the FDD mode.
The TDD mode transmission control sub-switch 7211 of the TDD mode control switch is configured to connect the output terminal of the last stage power amplifier 12 to the output rf connector 13 according to the transmission control signal; and the TDD mode reception control sub-switch 7212 is configured to switch on the input terminal of the low noise amplifier 15 and the output rf connector 13 according to the reception control signal.
It should be noted that in this embodiment, the transmission control signal for controlling the TDD mode transmission control sub-switch 7211 and the reception control signal for controlling the TDD mode reception control sub-switch 7212 may be manually input by a user, or may be received by a circuit or preset.
The FDD mode control switch 722 is used for connecting the output terminal of the final stage power amplifier 12 and the input terminal of the low noise amplifier 15 to the output rf connector 13 according to the transceiving control signal.
It should be noted that the transceiving control signal for controlling the FDD mode control switch 722 in this embodiment may be manually input by the user, or may be received or preset by the circuit.
It should be understood that, in this embodiment, the mode selection switch 71 may be designed to switch on the TDD mode control switch and the FDD mode control switch simultaneously, for example, two switching-on connection pads are designed to be switched on with the TDD mode control switch and the FDD mode control switch respectively, so as to implement that the base station rf signal transceiver circuit operates in the TDD mode and the FDD mode simultaneously.
Or, the mode selection switch 71 may not be designed to be capable of simultaneously turning on the TDD mode control switch and turning on the FDD mode control switch, and at this time, only two mode control circuits need to be set, and the base station radio frequency signal transceiver circuit can also work in the TDD mode and the FDD mode simultaneously.
It should be understood that the structure of the base station rf signal transceiver circuit illustrated in this embodiment is only a part of the exemplary structure, and the structure of the base station rf transmitting circuit portion of the base station rf signal transceiver circuit may be any one of the structures illustrated in the first embodiment, or a modification thereof; the structure of the radio frequency signal receiving circuit portion thereof may be the circuit structure exemplified in the present embodiment and variations thereof.
In this embodiment, all or part of the devices may be connected by microstrip lines, for example, the radio frequency input connector 11 and the first stage power amplifier 12 may be connected by microstrip lines.
The base station radio frequency signal transceiver circuit provided by this embodiment is designed with a base station radio frequency transmitting circuit with a multistage power amplifier, and has a structure that: the output radio frequency connector is connected with the input end of the low-noise amplifier, the output end of the low-noise amplifier is connected with the radio frequency signal receiving circuit connected with the radio frequency output connector, multi-band radio frequency communication is achieved, meanwhile, multi-band radio frequency communication under multiple modes is achieved by designing a mode control circuit, the size of the circuit is reduced, the heat productivity is reduced, and the overall efficiency of the circuit is improved.
EXAMPLE III
To better illustrate the technical solution of the present invention, this embodiment further illustrates the present invention by using a specific base station rf signal transceiver circuit structure on the basis of the first embodiment and the second embodiment.
Referring to fig. 8, fig. 8 is a schematic structural diagram of a specific base station rf signal transceiving circuit provided in this embodiment, wherein:
the radio frequency input connector 11 is connected with the input end of a first-stage power amplifier G1, the output end of the first-stage power amplifier G1 is connected with the input end of a second-stage power amplifier G2, the output end of the second-stage power amplifier G2 is connected with the input end of a power divider, the output ends of the power divider are respectively connected with the input ends of two identical power tubes G3 and G4, and the output ends of G3 and G4 are connected with the input end of a synthesizer. G3 and G4 work in AB class and C class respectively, and the power divider, the power tubes G3 and G4 and the synthesizer form a Doherty power amplifier. Wherein the working frequencies of G1, G2, G3 and G4 are all 1.8 GHz-2.7 GHz.
The output end of the synthesizer is connected with one side of the TDD mode transmission control sub-switch 7211 of the TDD mode control switch and one side of the FDD mode control switch 722; while the other side of the TDD mode transmission control sub-switch 7211 and the other side of the FDD mode control switch 722 are connected to the output rf connector 13 through the mode selection switch 71.
One side of the mode selection switch 71 is connected to the input terminal of the low noise amplifier G5 through the TDD mode reception control sub-switch 7212 and the FDD mode control switch 722, and the output terminal of the low noise amplifier G5 is connected to the rf output connector 16, in addition to the output terminal of the synthesizer through the TDD mode transmission control sub-switch 7211 and the FDD mode control switch 722.
In operation, the circuit first determines the operating mode, and the mode selection switch 71 selectively turns on the TDD mode control switch or the FDD mode control switch 722. For example, when the TDD mode is operated, the rf input connector 11 may receive transmit rf signals in multiple frequency bands, for example, transmit rf signals in three frequency bands of 1880MHz to 1920MHz, 2300MHz to 2400MHz, and 2500MHz to 2700MHz, at this time, the three transmit rf signals may be sequentially power-amplified through G1 and G2, and then input to the Doherty power amplifier for processing, at this time, there may be one transmit control signal (which may be input by a user or generated by a preset circuit), the TDD mode transmit control sub-switch 7211 of the TDD mode control switch is controlled to be closed, so that the output end of the synthesizer is connected to the output rf connector 13, and the output rf connector 13 transmits the three processed transmit rf signals to a lower baseband or a terminal for processing.
Thereafter, the output rf connector 13 may receive a received rf signal transmitted at a lower baseband or a terminal, and at this time, there exists a received control signal (which may be input by a user or generated by a circuit in advance), and the TDD mode receiving control sub-switch 7212 of the TDD mode control switch is controlled to be closed, so that the output rf connector 13 is connected to the input terminal of the low noise amplifier G5, and the low noise amplifier G5 amplifies the received control signal, and outputs the processed received rf signal through the rf output connector 16.
It should be noted that, in the embodiment, the operation is described in the TDD mode, the transmitting rf signal and the receiving rf signal have the same frequency, but the base station rf transmitting circuit and the base station rf receiving circuit operate in a time-sharing manner, so that two control signals exist to control the TDD mode transmitting control sub-switch 7211 and the TDD mode receiving control sub-switch 7212 to be closed respectively. When the circuit works in the FDD mode, the transmitting radio frequency signal and the receiving radio frequency signal are different in frequency, but the base station radio frequency transmitting circuit and the radio frequency signal receiving circuit work simultaneously, so that the FDD mode control switch 722 is controlled to be closed only by one receiving and transmitting control signal, and the output radio frequency connector 13 is communicated with the base station radio frequency transmitting circuit and the radio frequency signal receiving circuit simultaneously.
The base station radio frequency signal transceiver circuit provided by this embodiment can satisfy the application in TDD mode or FDD mode of 2G, 3G, 4G base stations in the frequency band of 1.8 GHz-2.7 GHz via the function of the mode selection switch, and the radio frequency communication in multiple frequency bands and multiple systems is realized via one link, so that the circuit is small in size, easy to miniaturize the whole circuit and design the multi-frequency coverage, and meanwhile, the heat productivity is reduced, and the whole efficiency of the circuit is improved.
Example four
Referring to fig. 9, fig. 9 is a schematic flow chart of a signal transmission method that can be applied to the base station radio frequency transmission circuit in the first embodiment, where the signal transmission method includes:
s901, sequentially amplifying radio frequency signals to be transmitted by at least two stages of power amplifiers;
and S902, sending the amplified radio frequency signal to be sent out through an output radio frequency connector.
It should be noted that, in this embodiment, the radio frequency signal to be transmitted should include radio frequency signals of at least one frequency band within at least two transmission radio frequency signal frequency bands included in the operating frequencies of the power amplifiers of each stage. That is, the rf signal to be transmitted should be receivable by the rf input connector.
In this embodiment, the number of the radio frequency signals to be transmitted may be multiple, and for example, the radio frequency signals may be three radio frequency signals with frequency bands of 1880MHz to 1920MHz, 2300MHz to 2400MHz, and 2500MHz to 2700 MHz.
In this embodiment, when the base station rf transmitting circuit includes a third-stage power amplifier, and the third-stage power amplifier is a Doherty power amplifier, step S901 is: after the radio-frequency signal to be transmitted is subjected to power amplification by the first-stage power amplifier and the second-stage power amplifier in sequence, the radio-frequency signal is input into the Doherty power amplifier for processing, and the maximum output is realized.
In this embodiment, when the coupler exists in the radio frequency transmitting circuit of the base station, step S901 further includes: sending the radio frequency signal to be sent after amplification to a coupler for signal coupling processing;
step S902 is then: and transmitting the radio frequency signal to be transmitted after amplification and coupling processing through an output radio frequency connector.
The signal transmission method provided by the embodiment of the invention can be applied to the base station radio frequency transmission circuit, thereby realizing the multi-band radio frequency communication of the circuit, reducing the heat productivity of the circuit and improving the overall efficiency of the circuit.
The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and the practice of the invention is not to be considered limited to those descriptions. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. A base station radio frequency transmitting circuit is characterized by comprising a radio frequency input connector, an output radio frequency connector and at least two stages of power amplifiers which are connected in sequence; the radio frequency input connector is connected with the input end of a first-stage power amplifier in the at least two stages of power amplifiers, and the output radio frequency connector is connected with the output end of a last-stage power amplifier in the at least two stages of power amplifiers;
the working frequency of each stage of power amplifier comprises at least two transmitting radio frequency signal frequency bands;
the radio frequency input connector is used for simultaneously receiving the transmitting radio frequency signals of at least two frequency bands in the at least two transmitting radio frequency signal frequency bands, amplifying the transmitting radio frequency signals by the at least two stages of power amplifiers in sequence and then transmitting the amplified transmitting radio frequency signals through the output radio frequency connector.
2. The base station rf transmitting circuit of claim 1, wherein the operating frequency of each stage of power amplifier comprises three frequency bands for transmitting rf signals.
3. The base station radio frequency transmission circuit according to claim 2, wherein the operating frequency of each stage of the power amplifier is 1.8GHz to 2.7 GHz.
4. A base station radio frequency transmit circuit as claimed in any one of claims 1 to 3, further comprising a coupler connected between the output of said final power amplifier and the input of said output radio frequency connector;
and the coupler is used for coupling the transmitted radio frequency signal amplified by the last stage of power amplifier and outputting the coupled transmitted radio frequency signal to the output radio frequency connector.
5. The base station radio frequency transmit circuit of any of claims 1-3, wherein at least one of the at least two stages of power amplifiers is a Doherty power amplifier.
6. The base station radio frequency transmit circuit of claim 5, comprising a first stage power amplifier, a second stage power amplifier, and a third stage power amplifier connected in sequence, the third stage power amplifier being a Doherty power amplifier.
7. A base station radio frequency signal transceiver circuit, comprising a radio frequency signal receiving circuit and a base station radio frequency transmitting circuit according to any one of claims 1 to 6;
the radio frequency signal receiving circuit comprises a low noise amplifier connected with the output radio frequency connector and a radio frequency output connector connected with the output end of the low noise amplifier;
the output radio frequency connector is used for amplifying the received radio frequency signals through the low noise amplifier and then outputting the signals through the radio frequency output connector.
8. The base station radio frequency signal transceiver circuit of claim 7, further comprising a band pass filter connected between the low noise amplifier and the radio frequency output connector, wherein the band pass filter is configured to filter the received radio frequency signal amplified by the low noise amplifier and output the filtered received radio frequency signal to the radio frequency output connector.
9. The base station radio frequency signal transceiving circuit according to claim 7 or 8, further comprising a mode control circuit, the mode control circuit comprising a mode selection switch and a mode control switch;
the mode control switch comprises a TDD mode control switch and an FDD mode control switch; the TDD mode control switch comprises a TDD mode transmitting control sub-switch and a TDD mode receiving control sub-switch;
one side of the mode selection switch is connected with the output radio frequency connector, the other side of the mode selection switch is respectively connected with the TDD mode control switch and the FDD mode control switch, a TDD mode transmitting control sub-switch and a TDD mode receiving control sub-switch of the TDD mode control switch are respectively connected with the output end of the last stage of power amplifier and the input end of the low noise amplifier, and the FDD mode control switch is connected with the output end of the last stage of power amplifier and the input end of the low noise amplifier;
the mode selection switch is used for selectively switching on the TDD mode control switch or the FDD mode control switch;
the TDD mode transmission control sub-switch of the TDD mode control switch is used for connecting the output end of the last stage power amplifier with the output radio frequency connector according to a transmission control signal; the TDD mode receiving control sub-switch is used for connecting the input end of the low noise amplifier with the output radio frequency connector according to a receiving control signal;
the FDD mode control switch is used for closing according to a receiving and sending control signal so as to connect the output end of the last stage of power amplifier and the input end of the low noise amplifier with the output radio frequency connector.
10. A signal transmission method based on the base station rf transmission circuit according to any one of claims 1 to 6, comprising:
and sequentially amplifying the radio-frequency signals to be transmitted by the at least two stages of power amplifiers and then transmitting the radio-frequency signals through the output radio-frequency connector, wherein the radio-frequency signals to be transmitted comprise radio-frequency signals of at least two frequency bands in the at least two transmitting radio-frequency signal frequency bands.
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| CN201611178383.7A CN106849981B (en) | 2016-12-19 | 2016-12-19 | Base station radio frequency signal transceiving circuit, radio frequency transmitting circuit and signal transmitting method |
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| CN111082815B (en) * | 2018-10-18 | 2022-04-26 | 力同科技股份有限公司 | Power amplifier circuit, design method and communication terminal |
| WO2023070474A1 (en) * | 2021-10-28 | 2023-05-04 | 华为技术有限公司 | Multi-band power amplification circuit, radio frequency transceiver, and base station |
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| EP2073394A1 (en) * | 2007-12-19 | 2009-06-24 | Alcatel-Lucent Deutschland AG | A method for transmission and reception in FDD mode or in TDD mode in an antenna network, an antenna network, a base station, a mobile station and a communication network therefor |
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