Radio frequency signal power amplifier circuit and radio frequency transceiver circuit

Abstract

The utility model discloses a radio frequency signal power amplifier circuit and a radio frequency transmit-receive circuit, and relates to the technical field of communication, the radio frequency transmit-receive circuit comprises a radio frequency transceiver, the radio frequency signal power amplifier circuit comprises a power amplifier connected with the radio frequency transceiver, and a change-over switch circuit; the change-over switch circuit comprises a first end and a plurality of second ends, the first end is used for receiving a first receiving signal, the second ends comprise at least one third end and at least one fourth end, the third end is connected with the power amplifier, and the fourth end is connected with the radio frequency transceiver; the number of the second ends is greater than the number of the preset frequency bands, the number of the third ends is equal to the number of the preset frequency bands, and the fourth end is used for leading the first receiving signal to the radio frequency transceiver through the change-over switch circuit when the first receiving signal interferes with the first sending signal transmitted by the power amplifier. The utility model aims to improve the problem of CA combined frequency band coexistence interference, improve the anti-interference effect of signals, and further improve the working reliability of a radio frequency transceiver circuit.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a radio frequency signal power amplifier circuit and a radio frequency transceiver circuit. Background Art

[0002] Usually, the frequency bands supported by the power amplifier (PA) include low frequency, medium frequency, and high frequency, and the signals in the frequency division duplexing (FDD) band usually work in frequency division mode, that is, transmission and reception are carried out simultaneously. According to the current settings of some 4G PA architectures on the market, the receiving (RX) signal must first reuse the link of the transmitting (TX) signal and pass through the internal switch of the power amplifier (PA) before reaching the RF transceiver. Therefore, when designing the RF transceiver circuit using this kind of architecture PA, the RX signal of the TDD frequency band such as B38 / B40 / B41 is usually sent to the RF transceiver through the internal switch of the PA. However, if the isolation between the signals of the internal switch of the PA is not enough, the transmitting (TX) signal will interfere with the receiving (RX) signal. As a result, when the carrier aggregation (CA) signal combination works, the sensitivity of the interfered frequency band is reduced. In addition, when there is a LTE DLCA combination of FDD and TDD, such as CA_8A-41A, when B8 acts as PCC and B41 acts as SCC, under high-power working conditions, the receiving sensitivity of B41 is only -70dBm, that is, the frequency multiplication of the low-frequency first transmission signal will interfere with the high-frequency receiving signal. Utility Model Content

[0003] The main purpose of the utility model is to provide a radio frequency signal power amplifier circuit and a radio frequency transceiver circuit, aiming to improve the problem of coexistence interference in CA combined frequency bands, so as to enhance the anti-interference effect of the signal, and further enhance the reliability of the radio frequency transceiver circuit.

[0004] To achieve the above object, the utility model proposes a radio frequency signal power amplifier circuit, which is applied to a radio frequency transceiver circuit. The radio frequency transceiver circuit includes a radio frequency transceiver. The radio frequency signal power amplifier circuit includes:

[0005] a power amplifier, the power amplifier being electrically connected to the radio frequency transceiver;

[0006] A switching switch circuit, the switching switch circuit comprising a first end and a plurality of second ends, the first end being used to receive a first receive signal, the second end comprising at least one third end and at least one fourth end, the third end being electrically connected to the power amplifier, and the fourth end being electrically connected to the radio frequency transceiver;

[0007] Among them, the number of the second ends is greater than the number of preset frequency bands, the number of the third ends is equal to the number of preset frequency bands, and the fourth end is used to guide the first receiving signal to the RF transceiver through the switching circuit from the fourth end when there is interference between the first receiving signal and the first transmitting signal transmitted by the power amplifier.

[0008] In one embodiment, the radio frequency signal power amplifier circuit further includes:

[0009] a first switch component, wherein an input end of the first switch component is electrically connected to the fourth end, and an output end of the first switch component is electrically connected to the radio frequency transceiver;

[0010] The first switch component is used to output a plurality of first received signals with interference to the radio frequency transceiver respectively.

[0011] In one embodiment, if the number of the second ends is equal to the number of the preset frequency bands, the radio frequency signal power amplifier circuit further includes:

[0012] a second switch component, wherein an input end of the second switch component is electrically connected to the fourth end, a first end of the second switch component is electrically connected to the power amplifier, and a second end of the second switch component is electrically connected to the radio frequency transceiver;

[0013] The second end is used to guide the first receiving signal to the radio frequency transceiver.

[0014] In one embodiment, the radio frequency signal power amplifier circuit further includes:

[0015] A filter circuit, wherein an input end of the filter circuit is electrically connected to the fourth end, and an output end of the filter circuit is electrically connected to the radio frequency transceiver;

[0016] The filtering circuit is used for filtering the first receiving signal outputted from the fourth end and then outputting the signal to the radio frequency transceiver.

[0017] In one embodiment, the filter circuit includes a first capacitor, a second capacitor, a third capacitor and a first inductor;

[0018] The first end of the first capacitor is electrically connected to the fourth end, the second end of the first capacitor, the first end of the second capacitor, and the first end of the third capacitor are interconnected, the second end of the second capacitor is electrically connected to the RF transceiver, the second end of the third capacitor is electrically connected to the first end of the first inductor, and the second end of the first inductor is grounded.

[0019] The utility model also proposes a radio frequency transceiver circuit, which includes the radio frequency signal power amplifier circuit described in any one of the above items and the radio frequency transceiver.

[0020] In one embodiment, the RF transceiver circuit includes an antenna port, and the first end of the switching circuit is electrically connected to the antenna port, and the antenna port is used to transmit a first receiving signal to the switching circuit and receive a first transmitting signal transmitted by the switching circuit.

[0021] The utility model proposes a radio frequency signal power amplifier circuit, which is applied to a radio frequency transceiver circuit. The radio frequency transceiver circuit comprises a radio frequency transceiver, and the radio frequency signal power amplifier circuit comprises a power amplifier connected to the radio frequency transceiver and a switching switch circuit; the switching switch circuit comprises a first end and a plurality of second ends, the first end is used to receive a first receiving signal, the second end comprises at least one third end and at least one fourth end, the third end is connected to the power amplifier, and the fourth end is connected to the radio frequency transceiver; the number of the second ends is greater than the number of preset frequency bands, the number of the third ends is equal to the number of preset frequency bands, and the fourth end is used to guide the first receiving signal from the fourth end to the radio frequency transceiver through the switching switch circuit when there is interference between the first receiving signal and the first transmitting signal emitted by the power amplifier.

[0022] In practical applications, when there is a problem of coexistence interference of CA combined frequency bands, that is, when there is an LTEDLCA combination of FDD and TDD, such as CA_8A-41A, the first received signal includes a received signal of the B41 frequency band that is susceptible to interference. The switching circuit can directly output the first received signal to the RF transceiver through its own fourth terminal without passing through the power amplifier and the switch inside the power amplifier. In this way, the signal that is susceptible to interference is directly introduced into the RF transceiver through the shunt lead-out method, thereby avoiding the first transmitted signal of the B8 frequency band passing through the internal switch of the PA from interfering with the received signal of the B41 frequency band, improving the problem of coexistence interference of the CA combined frequency bands, and improving the anti-interference effect of the signal, thereby improving the reliability of the operation of the RF transceiver circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1 This is a schematic diagram of a circuit module of an embodiment of a radio frequency signal power amplifier circuit of the utility model;

[0025] Figure 2 This is a circuit module schematic diagram of another embodiment of the radio frequency signal power amplifier circuit of the utility model;

[0026] Figure 3 This is a circuit module schematic diagram of another embodiment of the radio frequency signal power amplifier circuit of the utility model;

[0027] Figure 4 This is a circuit module schematic diagram of another embodiment of the radio frequency signal power amplifier circuit of the utility model;

[0028] Figure 5 A specific circuit diagram of an embodiment of a radio frequency signal power amplifier circuit in the prior art;

[0029] Figure 6 A specific circuit diagram of another embodiment of the radio frequency signal power amplifier circuit of the utility model;

[0030] Figure 7 A specific circuit diagram of another embodiment of the radio frequency signal power amplifier circuit of the utility model;

[0031] Figure 8 A specific circuit diagram of another embodiment of the radio frequency signal power amplifier circuit of the utility model;

[0032] Fig. 9 The utility model is a specific circuit diagram of the filter circuit in the radio frequency signal power amplifier circuit.

[0033] Description of Figure Numbers:

[0034] 10. Power amplifier; 20. Switching switch circuit; 30. Third terminal; 40. Fourth terminal; 50. Filter circuit; 60. Antenna port; 70. RF transceiver; 80. First switch component; 90. Second switch component.

[0035] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0038] Usually, the frequency bands supported by the power amplifier 10 (PA) include low frequency, medium frequency, and high frequency, and the signals in the frequency division duplexing (FDD) frequency band usually work in frequency division mode, that is, transmission and reception are performed simultaneously. According to the current settings of some 4G PA architectures on the market, the receiving (RX) signal must first reuse the link of the transmitting (TX) signal and pass through the internal switch of the power amplifier 10 (PA) before reaching the RF transceiver 70 (Transceiver). Therefore, when designing a RF transceiver circuit using this type of architecture PA, the RX signal of the TDD frequency band such as B38 / B40 / B41 is usually sent to the RF transceiver 70 through the internal switch of the PA. However, if the isolation between the signals of the internal switch of the PA is not enough, the transmitting (TX) signal will interfere with the receiving (RX) signal. This will further reduce the sensitivity of the interfered frequency band when the carrier aggregation (CA) signal combination works. In addition, when there is a LTE DLCA combination of FDD and TDD, such as CA_8A-41A, when B8 acts as PCC and B41 acts as SCC, under high-power working conditions, the receiving sensitivity of B41 is only -70dBm, that is, the frequency multiplication of the low-frequency first transmission signal will interfere with the high-frequency receiving signal.

[0039] refer to Figure 5 , Figure 5 It is a specific circuit diagram of the RF signal power amplifier circuit in the prior art. The first transmission signal of the B8 frequency band enters the low-frequency band LB2 channel from the 18th pin, and then enters the input end of the power amplifier 10 after passing through the internal switch. The receiving signal of the B41 frequency band enters the high-frequency band HB2 from the 35th pin, passes through another internal switch and is output to the RF transceiver 70 through the 42th pin. Since the receiving signal of the TDD frequency band must first multiplex the link of the TX signal and pass through the internal switch of the PA before finally reaching the RF transceiver 70 (Transceiver), the receiving sensitivity is reduced.

[0040] To this end, the utility model proposes a radio frequency signal power amplifier circuit, referring to Figure 1The radio frequency signal power amplifier circuit is applied to the radio frequency transceiver circuit, the radio frequency transceiver circuit includes a radio frequency transceiver 70, and the radio frequency signal power amplifier circuit includes:

[0041] A power amplifier 10, wherein the power amplifier 10 is electrically connected to the RF transceiver 70;

[0042] A switching circuit 20, wherein the switching circuit 20 includes a first end and a plurality of second ends, wherein the first end is used to receive a first reception signal, and the second end includes at least one third end 30 and at least one fourth end 40, wherein the third end 30 is electrically connected to the power amplifier 10, and the fourth end 40 is electrically connected to the RF transceiver 70;

[0043] Among them, the number of the second ends is greater than the number of preset frequency bands, the number of the third ends 30 is equal to the number of the preset frequency bands, and the fourth end 40 is used to guide the first receiving signal to the RF transceiver 70 through the switching circuit 20 from the fourth end 40 when there is interference between the first receiving signal and the first transmitting signal transmitted by the power amplifier 10.

[0044] In this embodiment, the power amplifier 10 can be implemented by a power amplifier chip, such as a CB2401 RF front-end chip, an RFX2411 power amplifier chip, an 8TR8201 RF transceiver circuit, etc. It should be noted that the power amplifier chip in this embodiment not only has a power amplification function, but also integrates the transmission and reception functions. The switching switch circuit 20 can be implemented by a switch tube such as a PIN diode switch, a field effect transistor, or a switching device such as a relay, a contactor, or a RF switch SPDT. In addition, the switching switch circuit 20 can also be implemented by a toggle switch. In this embodiment, the switching switch circuit 20 is implemented by a RF switch. Among them, the switching switch circuit 20 includes any one of an SP2T RF switch, an SP4T RF switch, and an SP6T RF switch. The corresponding RF switch can be set according to the number of frequency bands actually required. It should be noted that the number of the second end is greater than the number of preset frequency bands, and the number of the third end 30 is equal to the number of preset frequency bands. The preset frequency band is set in advance by the R&D personnel, and the preset frequency band is the working frequency band of the CA combination signal. That is, the number of RF switch ports needs to be greater than the number of operating frequency bands, so that when combined signal interference exists, at least one first receiving signal can be directly introduced into the RF transceiver 70 via redundant ports.

[0045] Specifically, refer to Figure 6When the switching circuit 20 receives the first receiving signal, that is, when the control circuit inside the RF transceiver 70 determines that it is currently in the CA working mode, the switching circuit 20 is controlled to conduct the path between its own fourth terminal 40 and the first terminal, so as to directly introduce the signal susceptible to interference from the switching circuit 20 into the RF transceiver 70. Among them, the first receiving signal includes a receiving signal in the B41 frequency band. In this embodiment, the switching circuit 20 is implemented by using an SP4T RF switch. It can be understood that the SP4T RF switch includes a first end and three second ends, and the three second ends are respectively used to electrically connect to the power amplifier 10 to transmit signals of the three frequency bands of B40, B41, and B7. When there is a LTE DLCA combination of FDD and TDD, such as CA_8A-41A, if the B8 frequency band is used as the main carrier PCC and the B41 frequency band is used as the auxiliary carrier SCC, under the high-power working condition of B8, the receiving signal of the B41 frequency band can directly enter the RF transceiver 70 from the fourth end 40 of the switching circuit 20 without passing through the PA and the switch inside the PA. Under the high-power working condition of B8, the receiving sensitivity of B41 is improved from -70dBm to -96dBm, which improves the problem of reduced receiving sensitivity of the receiving signal of the high frequency band of the CA combination signal due to passing through the internal switch. It should be noted that at this time, the first transmission signal of B8 will not pass through the SP4T RF switch, but enter the power amplifier 10PA from other low-frequency paths.

[0046] In practical applications, a signal line can be drawn from the extra port of the RF switch and connected to the RF transceiver 70 to provide a separate signal path for use with LTE B41 PRX and LTE DLCA CA_8A-41A. In this way, the signal is prevented from being interfered with after passing through the internal switch of the PA. No additional components are required, which reduces the circuit design cost and improves the feasibility of the RF signal amplifier circuit of the utility model. In this way, when there is a combination of FDD and TDD LTE DLCA, the signal that is susceptible to interference is directly introduced into the RF transceiver 70 by means of shunt extraction, which optimizes the problem of the first low-frequency band transmission signal passing through the internal switch of the PA causing interference to the high-frequency band reception signal, improves the coexistence interference problem of the cellular CA combination frequency band, improves the reliability of the RF transceiver circuit, optimizes the product performance, and thus improves the user experience.

[0047] Understandably, the problem becomes more complicated when multiple interference-prone receive signals are included in the CA combination. Different carriers may be in adjacent or overlapping frequency bands, each carrying independent data streams, and any degradation in the sensitivity of the receive signal will directly affect the overall communication quality and data throughput.

[0048] To this end, in another embodiment of the present invention, reference Figure 2, the radio frequency signal power amplifier circuit also includes:

[0049] A first switch component 80, wherein an input end of the first switch component 80 is electrically connected to the fourth end 40, and an output end of the first switch component 80 is electrically connected to the RF transceiver 70;

[0050] The first switch component 80 is used to output a plurality of first received signals with interference to the RF transceiver 70 respectively.

[0051] In this embodiment, the first switch component 80 can be implemented by a switch tube such as a PIN diode switch, a field effect transistor, or a switch device such as a relay, a contactor, or a radio frequency switch SPDT.

[0052] In combination with the above embodiments, when the CA combination includes multiple interference-susceptible receiving signals, it is necessary to add multiple first switch components 80, each of which can be used to correspondingly conduct a path between the second end of a switching switch circuit 20 and the RF transceiver 70, and to output the interference-susceptible signals one by one to the RF transceiver 70 respectively.

[0053] It is understandable that the first switch component 80 can be implemented by a radio frequency switch. In this way, when there are multiple first received signals susceptible to interference, the number of ports of the radio frequency switch can be selected according to the number of frequency bands of the first received signals susceptible to interference. For example, when there are first received signals of two working frequency bands, it is only necessary to select an SP2T radio frequency switch to introduce the first received signals of the two working frequency bands into the radio frequency transceiver 70 respectively.

[0054] refer to Figure 7 , the switching circuit 20 uses an SP4T RF switch, including three third terminals 30 and one fourth terminal 40, wherein the three third terminals 30 are respectively used to transmit signals of three frequency bands, B40, B41, and B7. At this time, there are multiple first receiving signals susceptible to combined interference, that is, B41 for CA is included and B40 for CA needs to be added. Therefore, an SP2T RF switch can be selected as the first switch component 80 to lead the first receiving signals B41 for CA and B40for CA of the two working frequency bands to the RF transceiver 70. In this way, the problem that the signals of B41 for CA and B40 for CA are interfered by the first transmission signal after passing through the internal switch of PA is avoided, and the reliability of the RF signal power amplifier circuit is improved.

[0055] The setting of the first switch component 80 can lead out multiple first receiving signals that are susceptible to interference from the first transmitting signal to the RF transceiver 70 respectively when there are multiple combined interferences, and directly introduce multiple signals that are susceptible to interference into the RF transceiver 70 by means of shunt leading-out method, thereby optimizing the problem of interference of the low-frequency band first transmitting signal passing through the internal switch of the PA on the high-frequency band receiving signal, improving the coexistence interference problem of the cellular CA combined frequency band, and improving the reliability of the operation of the RF transceiver circuit.

[0056] In an embodiment of the present utility model, if the number of the second ends is equal to the number of the preset frequency bands, the radio frequency signal power amplifier circuit further includes:

[0057] a second switch component 90, wherein an input end of the second switch component 90 is electrically connected to the fourth end 40, a first end of the second switch component 90 is electrically connected to the power amplifier 10, and a second end of the second switch component 90 is electrically connected to the RF transceiver 70;

[0058] The second end is used to guide the first receiving signal to the RF transceiver 70 .

[0059] In combination with the above embodiments, when the number of the third terminals 30 of the switching circuit 20 is equal to the number of the preset frequency bands, the switching circuit 20 has no redundant fourth terminals 40 to directly guide the first receiving signal to the RF transceiver 70. At this time, the first receiving signal susceptible to interference can be output to the RF transceiver 70 through the second switch component 90.

[0060] Specifically, refer to Figure 8 The switching circuit 20 uses an SP3T RF switch, including three third terminals 30, wherein the three third terminals 30 are used to transmit signals of three frequency bands, B40, B41, and B7, respectively. Since the SP3T RF switch does not have a redundant port to lead out the first receiving signal B40 for CA, a second switch component 90 can be set to be electrically connected to any third terminal 30 of the switching circuit 20, and the first receiving signal can be led to the RF transceiver 70 via the electrically connected third terminal 30. In this way, the first receiving signal does not need to enter the internal switch of the power amplifier 10, thereby avoiding the interference caused by the first transmitting signal.

[0061] It should be noted that, in this embodiment, the second switch component 90 can be implemented by a radio frequency switch. For example, a single-pole single-throw switch SP1T radio frequency switch, when there is a coexistence interference combination signal, the control circuit inside the radio frequency transceiver 70 controls the second switch component 90 to conduct the path of its own input end and output end to output the first received signal to the radio frequency transceiver 70. It can be understood that when there are multiple first received signals susceptible to interference, a second switch component 90 with multiple output ends can be selected to implement, for example, the corresponding radio frequency switch is selected according to the number of frequency bands of the first received signal susceptible to interference.

[0062] The second switch assembly 90 can be provided to directly guide the first receiving signal susceptible to interference to the RF transceiver 70 when the switching switch circuit 20 in the original test circuit does not have redundant ports to provide a separate signal path, thereby improving the interference effect of the first transmitting signal on the first receiving signal through simple components. In this way, the reliability of the RF transceiver circuit is improved and the design cost of the circuit is reduced.

[0063] In another embodiment of the present invention, reference Figure 3 , the radio frequency signal power amplifier circuit also includes:

[0064] A filter circuit 50, wherein an input end of the filter circuit 50 is electrically connected to the fourth end 40, and an output end of the filter circuit 50 is electrically connected to the RF transceiver 70;

[0065] The filtering circuit 50 is used for filtering the first receiving signal outputted from the fourth terminal 40 and then outputting the first receiving signal to the RF transceiver 70 .

[0066] In this embodiment, the filter circuit 50 includes a first capacitor, a second capacitor, a third capacitor and a first inductor;

[0067] Among them, the first end of the first capacitor is electrically connected to the fourth end 40, the second end of the first capacitor, the first end of the second capacitor, and the first end of the third capacitor are interconnected, the second end of the second capacitor is electrically connected to the RF transceiver 70, the second end of the third capacitor is electrically connected to the first end of the first inductor, and the second end of the first inductor is grounded.

[0068] In this embodiment, the filter circuit 5050 can be implemented by using a filter circuit 50 that is a combination of at least one of a capacitor, an inductor, and a resistor, or by using a filter element. The first received signal includes an intermediate frequency signal, a high frequency signal, and an ultra-high frequency signal, so the matching combination design of LPF (low-pass filter) and HPF (high-pass filter) can be selected accordingly according to the working frequency band of the first received signal to achieve flexible matching of the filter circuit 50.

[0069] Specifically, when there is a LTE DLCA combination of FDD and TDD, the switching circuit 20 outputs the high-frequency RX signal to the filter circuit 5050 via the fourth terminal 40, so that the filter circuit 5050 filters the first received signal output from the fourth terminal 40 of the switching circuit 20 and outputs it to the RF transceiver 70, thereby filtering out signals other than the high-frequency band receiving frequency. For example, when the first received signal includes a B41 for CA signal, the filter circuit 50 is implemented by a B41 RX filter, the input end of the B41RX filter is electrically connected to the fourth terminal 40 of the switching circuit 20, and the output end of the B41RX filter is electrically connected to the RF transceiver 70. In combination with the above embodiment, when there is a LTE DLCA combination of FDD and TDD, such as the B8 frequency band is used as PCC and the B41 frequency band is used as SCC, the switching circuit 20 outputs the B8 RX signal to the B41 RX filter via the fourth terminal 40, so that the B41RX filter filters out signals other than the B41 receiving frequency, thereby improving the receiving sensitivity.

[0070] It is understandable that, for cost considerations, a Notch Filter may be used as the filter circuit 50 to save costs. Fig. 9 , the first end of the first capacitor C1 is electrically connected to the fourth end 40, the second end of the first capacitor C1, the first end of the second capacitor C2, and the first end of the third capacitor C3 are interconnected, the second end of the second capacitor C2 is electrically connected to the RF transceiver 70, the second end of the third capacitor C3 is electrically connected to the first end of the first inductor L, and the second end of the first inductor L is grounded. In this embodiment, the capacitance of the first capacitor and the second capacitor is equal. That is, by reasonably selecting the values ​​of the inductor and each capacitor, the circuit can significantly attenuate the signal at a specific notch frequency, while maintaining a low insertion loss at other frequencies, thereby achieving the effect of notch filtering.

[0071] Through the above arrangement, the utility model can not only lead a signal line from the switching switch circuit 20, such as the fourth terminal 40 of the SP4T switch, to the RF transceiver 70 while keeping the original RF device unchanged, so as to facilitate the first receiving signal to directly enter the RF transceiver 70 from the SP4T before the multiplexed TX path B41TXSAW, and provide a separate signal path for signals susceptible to interference. In addition, the utility model filters the signals susceptible to interference, further improving the anti-interference effect of the high-frequency band receiving signal. In this way, the reliability and stability of the RF signal power amplifier circuit of the utility model are improved.

[0072] The utility model further proposes a radio frequency transceiver circuit, which includes a radio frequency transceiver 70 and any one of the radio frequency signal amplifier circuits described above.

[0073] In this embodiment, reference Figure 4 The RF transceiver circuit includes an antenna port 60, and the first end of the switching switch circuit 20 is electrically connected to the antenna port 60. The antenna port 60 is used to output the first receiving signal to the switching switch circuit 20, and to receive the first transmitting signal transmitted by the switching switch circuit 20 to output the first transmitting signal.

[0074] Specifically, in combination with the above-mentioned embodiments, the B8 frequency band is used as the main carrier PCC and the B41 frequency band is used as the auxiliary carrier SCC. When the communication module receives the B41 signal sent by the base station, the B41 receiving signal (the first receiving signal) multiplexes the TX path from the antenna port 60 to the first end of the SP4T RF switch in front of the B41 TX SAW, and then the RF switch conducts the path between its first end and the fourth end 40, so that the B41 receiving signal directly enters the RF transceiver 70 from the L3 layer. The problem of the B41 receiving signal being interfered with and the receiving sensitivity being reduced after passing through the internal switch of the PA is avoided. In this way, the anti-interference effect of the RF transceiver circuit is improved, thereby improving the reliability and stability of the RF transceiver circuit.

[0075] It is worth noting that since the RF transceiver circuit of the present invention is based on the above-mentioned RF signal power amplifier circuit, the embodiments of the RF transceiver circuit of the present invention include all technical solutions of all embodiments of the above-mentioned RF signal power amplifier circuit, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0076] The above description is only an optional embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the inventive concept of the utility model, or directly / indirectly used in other related technical fields are included in the scope of the utility model.

Claims

1. A radio frequency signal power amplifier circuit, applied to a radio frequency transceiver circuit, wherein the radio frequency transceiver circuit comprises a radio frequency transceiver, characterized in that: The radio frequency signal power amplifier circuit comprises: a power amplifier, the power amplifier being electrically connected to the radio frequency transceiver; A switching switch circuit, the switching switch circuit comprising a first end and a plurality of second ends, the first end being used to receive a first receive signal, the second end comprising at least one third end and at least one fourth end, the third end being electrically connected to the power amplifier, and the fourth end being electrically connected to the radio frequency transceiver; Among them, the number of the second ends is greater than the number of preset frequency bands, the number of the third ends is equal to the number of preset frequency bands, and the fourth end is used to guide the first receiving signal to the RF transceiver through the switching circuit from the fourth end when there is interference between the first receiving signal and the first transmitting signal transmitted by the power amplifier.

2. The radio frequency signal power amplifier circuit according to claim 1, characterized in that: The radio frequency signal power amplifier circuit also includes: a first switch component, wherein an input end of the first switch component is electrically connected to the fourth end, and an output end of the first switch component is electrically connected to the radio frequency transceiver; The first switch component is used to output a plurality of first received signals with interference to the radio frequency transceiver respectively.

3. The radio frequency signal power amplifier circuit according to claim 1, characterized in that: If the number of the second ends is equal to the number of the preset frequency bands, the radio frequency signal power amplifier circuit further includes: a second switch component, wherein an input end of the second switch component is electrically connected to the fourth end, a first end of the second switch component is electrically connected to the power amplifier, and a second end of the second switch component is electrically connected to the radio frequency transceiver; The second end is used to guide the first receiving signal to the radio frequency transceiver.

4. The radio frequency signal power amplifier circuit according to claim 1, characterized in that: The radio frequency signal power amplifier circuit also includes: A filter circuit, wherein an input end of the filter circuit is electrically connected to the fourth end, and an output end of the filter circuit is electrically connected to the radio frequency transceiver; The filtering circuit is used for filtering the first receiving signal outputted from the fourth end and then outputting the signal to the radio frequency transceiver.

5. The radio frequency signal power amplifier circuit according to claim 4, characterized in that: The filter circuit includes a first capacitor, a second capacitor, a third capacitor and a first inductor; The first end of the first capacitor is electrically connected to the fourth end, the second end of the first capacitor, the first end of the second capacitor, and the first end of the third capacitor are interconnected, the second end of the second capacitor is electrically connected to the RF transceiver, the second end of the third capacitor is electrically connected to the first end of the first inductor, and the second end of the first inductor is grounded.

6. A radio frequency transceiver circuit, characterized in that: The radio frequency transceiver circuit includes the radio frequency signal power amplifier circuit according to any one of claims 1 to 5 and the radio frequency transceiver.

7. The radio frequency transceiver circuit according to claim 6, characterized in that: The RF transceiver circuit includes an antenna port, and the first end of the switching circuit is electrically connected to the antenna port. The antenna port is used to transmit a first receiving signal to the switching circuit and receive a first transmitting signal transmitted by the switching circuit.

Images