RF power amplifier circuit, RF system and wireless communication equipment

Abstract

A radio frequency power amplifier circuit, a radio frequency system and a wireless communication device, which avoid the problem of deterioration of receiving sensitivity caused by noise introduced by CPL. The radio frequency power amplifier circuit includes a transmitting path, a receiving path and a coupling path, as well as a radio frequency input port, a radio frequency output port, a coupling output port and an antenna port; wherein: the transmitting path is connected to the radio frequency input port and the antenna port, and is used to process the transmitting signal input by the radio frequency input port, and output it through the antenna port; the receiving path is connected to the antenna port and the radio frequency output port, and is used to process the receiving signal input by the antenna port, and output it through the radio frequency output port; the coupling path is coupled to the transmitting path and is independent of the receiving path, and is used to collect the feedback signal of the transmitting signal, and output it through the coupling output port. The use of the scheme of the present application can prevent the noise of the transmitting signal from falling into the receiving frequency band, and avoid the problem of deterioration of receiving sensitivity.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to, but are not limited to, the field of radio frequency technology, and in particular to a radio frequency power amplifier circuit, a radio frequency system, and a wireless communication device. Background Art

[0002] With the development and progress of technology, mobile communication technology has gradually begun to be applied to communication equipment. For communication equipment that supports the fifth generation (5G) mobile communication technology, in the non-standalone (NSA) mode, a dual connection mode of 4G signals and 5G signals is usually adopted. For the non-standalone networking mode, the feedback receiver (FBRX) detection mechanism in the related technology reads the signal transmitted by the antenna end through a path, and completes the power control by analyzing the signal. However, when performing FBRX detection and receiving the signal through the coupler (CPL), the problem of desensitization will occur. Summary of the invention

[0003] The embodiments of the present disclosure provide a radio frequency power amplifier circuit, a radio frequency system and a wireless communication device, which avoid the problem of deterioration of receiving sensitivity caused by noise introduced by CPL.

[0004] On the one hand, an embodiment of the present disclosure provides a radio frequency power amplifier circuit, including a transmitting path, a receiving path and a coupling path, as well as a radio frequency input port, a radio frequency output port, a coupling output port and an antenna port; wherein:

[0005] The transmission path is connected to the RF input port and the antenna port, and is used to process the transmission signal input from the RF input port and output it through the antenna port;

[0006] The receiving path is connected to the antenna port and the RF output port, and is used to process the receiving signal input by the antenna port and output it through the RF output port;

[0007] The coupling path is coupled to the transmitting path and is independent of the receiving path, and is used to collect a feedback signal of the transmitting signal and output it through the coupling output port.

[0008] On the other hand, an embodiment of the present disclosure further provides a radio frequency system, including a radio frequency transceiver, the aforementioned radio frequency power amplifier circuit, and an antenna system, wherein the signal transmitted by the radio frequency transceiver is processed by the radio frequency power amplifier circuit and then transmitted by the antenna system.

[0009] On the other hand, an embodiment of the present disclosure further provides a wireless communication device including the aforementioned radio frequency system.

[0010] The RF power amplifier circuit, RF system and wireless communication device of the embodiments of the present disclosure independently set the coupling path and the receiving path. When a signal is received through the receiving path, the received signal will not pass through the coupling path, thereby preventing the noise of the transmitted signal from falling into the receiving frequency band and avoiding the problem of deterioration of the receiving sensitivity.

[0011] Other features and advantages of the present disclosure will be described in the following description, and partly become apparent from the description, or be understood by implementing the present disclosure. Other advantages of the present disclosure can be realized and obtained by the schemes described in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to provide an understanding of the technical solution of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solution of the present disclosure and do not constitute a limitation on the technical solution of the present disclosure. The shapes and sizes of the components in the accompanying drawings do not reflect the actual proportions and are only intended to illustrate the contents of the present disclosure.

[0013] Figure 1 This is a schematic diagram of the CPL architecture;

[0014] Figure 2a is the channel flow diagram before switching;

[0015] Figure 2b is the channel flow diagram after switching;

[0016] Figure 3 This is a schematic diagram of the radio frequency application solution in the FDD frequency band;

[0017] Figure 4 This is a schematic diagram of the radio frequency application solution in the TDD frequency band;

[0018] Figure 5 A schematic diagram of a radio frequency power amplifier circuit according to an embodiment of the present disclosure;

[0019] Figure 6 A schematic diagram of an implementation method of the radio frequency power amplifier circuit according to an embodiment of the present disclosure;

[0020] Figure 7 for Figure 6 Schematic diagram of the transmitting and receiving paths when the RF power amplifier circuit is applied to the FDD frequency band;

[0021] Figure 8 for Figure 6 Schematic diagram of the transmitting and receiving paths when the RF power amplifier circuit is applied to the TDD frequency band;

[0022] Fig. 9 This is a pin diagram of the radio frequency power amplifier circuit according to an embodiment of the present disclosure;

[0023] Fig.10 A schematic diagram of another implementation of the radio frequency power amplifier circuit according to an embodiment of the present disclosure;

[0024] Fig.11 for Fig.10 Schematic diagram of the transmitting and receiving paths when the RF power amplifier circuit is applied to the TDD frequency band. DETAILED DESCRIPTION

[0025] The present disclosure describes multiple embodiments, but the description is exemplary rather than restrictive, and it is apparent to those skilled in the art that there may be more embodiments and implementations within the scope of the embodiments described in the present disclosure. Although many possible feature combinations are shown in the drawings and discussed in the specific embodiments, many other combinations of the disclosed features are possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with any other feature or element in any other embodiment, or may replace any other feature or element in any other embodiment.

[0026] The present disclosure includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features, and elements disclosed in the present disclosure may also be combined with any conventional features or elements to form a unique invention scheme defined by the claims. Any features or elements of any embodiment may also be combined with features or elements from other invention schemes to form another unique invention scheme defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in the present disclosure may be implemented individually or in any appropriate combination. Therefore, except for the limitations made according to the attached claims and their equivalents, the embodiments are not subject to other limitations. In addition, various modifications and changes may be made within the scope of protection of the attached claims.

[0027] In addition, when describing representative embodiments, the specification may have presented the method and / or process as a specific sequence of steps. However, to the extent that the method or process does not rely on the specific order of the steps described herein, the method or process should not be limited to the steps in the specific order described. As will be appreciated by those of ordinary skill in the art, other orders of steps are also possible. Therefore, the specific order of the steps set forth in the specification should not be interpreted as a limitation to the claims. In addition, the claims for the method and / or process should not be limited to the steps performed in the order written, and those skilled in the art can easily understand that these orders can be changed and still remain within the spirit and scope of the disclosed embodiments.

[0028] In the new generation of RF solutions, an RF amplifier circuit - PA-MiD (Power Amplifier Modules with Integrated Duplexer) can support the transmission of multiple signals in different frequency bands. For example, a PA-MiD can realize the ENDC function. The PA-MiD contains an MB PA (Mid Band PA) and an HB PA (High Band PA), and the two PAs can work at the same time. Taking the signal combination of B1 and B40 (B1 is a mid-band signal and B40 is a high-band signal) as an example, the two signals are amplified by MB PA and HB PA respectively, filtered by the filtering unit, and sent to different pins (PIN) for output through the RF circuit switch chip.

[0029] Feedback Receiver (FBRX) detection is a process of collecting feedback signals through CPL (Coupler) to detect and control the transmission signal. The waveform generator in the RF transceiver (Transciver, which has an FBRX input port) generates the transmission signal, which is then transmitted through the digital power amplifier G DIGtx and analog power amplifier G tx After amplification, it is transmitted by the antenna. tx After amplification, the transmit (TX) signal is sampled by a CPL to obtain the FBRX signal. The FBRX signal is passed through the analog power amplifier G FBRX and digital power amplifier G DIG After that, it enters the inner loop power control (ILPC). ILPC detects the size and quality of the FBRX signal and feeds it back to the digital power amplifier G of the transmitting signal. DIGtx To complete power control (including signal size and quality). DIGtx , G FBRX , G DIG and ILPC can be set in the RF transceiver, G tx It can be set in the RF power amplifier circuit. In the dual-transmission scenario, that is, when two signals of different frequency bands are transmitted simultaneously, during FBRX detection, each signal has an independent CPL for collection and detection. The collected signals are combined through the switch and input into the RF transceiver.

[0030] During the FBRX detection process, the FBRX calibration is performed first. During calibration, the RF transceiver transmits a fixed signal P Reference , and detect the output power TX of the transmitting signal through an external instrumentmeasure The transmitted signal is sampled by a CPL with a fixed coupling coefficient to obtain FBRX CPL FBRX CPL By using a known gain G FBRX and G DIG Enter ILPC and get FBRX ILPC Through FBRX calibration, we can get P Reference With TX measure 、FBRX CPL 、FBRX ILPC One-to-one correspondence ultimately completes power control.

[0031] CPL is a universal RF component that can be used for signal isolation, separation and mixing, such as power monitoring, source output power stabilization, signal source isolation, transmission and reflection frequency sweep testing, etc. The main technical indicators are directivity, standing wave ratio, coupling degree, and insertion loss. However, CPL does not have frequency selectivity. For signals of different frequencies, the main difference lies in the different coupling coefficients. By adjusting the coupler design, CPL with different coupling coefficients can be obtained. Figure 1 This is a schematic diagram of the CPL architecture.

[0032] The antenna switching diversity (ASDIV) function uses the SRS (Sounding Reference Signal) signal to find the best channel (corresponding to different antennas) so that the TX / PRX (primary receiver) signal is transmitted / received through the best channel to ensure signal quality. Figure 2a and Figure 2b As shown, Figure 2a TX is transmitted through antenna 1 (ANT1), PRX is received through ANT1, and DRX (diversity reception) is received through ANT2. After ASDIV switching, Figure 2b In the example, TX is transmitted through ANT2, PRX is received through ANT2, and DRX is received through ANT1.

[0033] In the RF solution where CPL is integrated into PA-MiD, the CPL in PA-MiD is set close to the antenna (ANT) output pin (PIN), and any RF signal needs to flow through the CPL, as shown in Figure 2, where CPL1 performs FBRX detection on the ANT1 signal. When the ASDIV function is in effect, ANT2 is used to output the TX signal. At this time, CPL2 needs to perform FBRX detection on the signal on ANT2.

[0034] Take frequency division duplex (FDD) as an example. Figure 3As shown in the figure, for TX signals, such as the B1 band, the RF (radio frequency) signal is generated by the RF transceiver and input into the PA-MiD. After being amplified by the MB PA, it flows through the B1 TX bandpass filter. Then it passes through CPL1 for FBRX detection and is output to the antenna by ANT1. For the FDD band, since the TX and RX frequencies are not equal, a TX bandpass filter and an RX bandpass filter are required to form a duplexer. The PRX signal is received by the antenna and input into the ANT1 port. After passing through CPL1, it flows into the B1 RX bandpass filter. After flowing out of the B1 RX bandpass filter, it is directly input into the LNA (Low Noise Amplifier) ​​and then input into the RF transceiver.

[0035] Take Time Division Duplexing (TDD) as an example. Figure 4 As shown in the figure, for TX signals, such as the B40 band, the RF transceiver generates an RF signal and inputs it into the PA-MiD. After being amplified by the HB PA, it flows through the B40 bandpass filter. It then passes through CPL1 for FBRX detection and is output to the antenna by ANT1. For the TDD band, since the TX and RX frequencies are equal, only one TX bandpass filter is required. The PRX signal is received by the antenna, input to the ANT1 port, passes through CPL1, flows to the B40 bandpass filter, and then flows to the HB SW. Under the control of the RF software, the HB SW points the switch to the PA at the TX time and to the LNA at the RX time. After the PRX signal is amplified by the LNA, it is finally input to the RF transceiver.

[0036] like Figure 3 and Figure 4 As shown, the TX and PRX signals of all frequency bands must pass through the CPL device when transmitting and receiving. When the CPL device is working in PA-MiD, there are 4 working states: OFF state, forward (FWD) state, reverse (REV) state and bypass (Bypass) state. Among them, when working, the platform will detect the TX signals of different time slots (slots) of different frames (only one signal is detected at a time, and the time for each detection is, for example, 20us), and the CPL is in the FWD state. When not working, the CPL is in the OFF state. In projects using the Q-Tunner function, the CPL needs to switch to the REV state twice every 50ms, with an interval of 4.6ms between the two times. In the Bypass state, the CPL is direct-through, and this state is used to connect in series with other CPLs.

[0037] In normal use, the OFF and FWD states will switch back and forth, and under certain conditions, there may be additional switching between the REV state, Bypass state, OFF state, and FWD state. The continuous switching of the switch will cause Tx noise in RX band, that is, the noise of the transmitted signal falls in the receiving frequency band. At this time, CPL is equivalent to a noise source, causing the PRX signal to introduce noise when passing through CPL, resulting in deterioration of the PRX receiving sensitivity (desense).

[0038] The actual measurement results show that the desense in the NR band is 2-3dB, which is in the unacceptable range. In addition, if the CPL state is forcibly fixed in the FWD state, although the desense will disappear, it will cause the Bypass and REV functions to fail and cause isolation problems, so this solution is not advisable.

[0039] In order to realize the ASDIV function, when calibrating FBRX, since CPL1 and CPL2 are different CPLs, it is impossible to ensure that they are completely consistent, so both CPLs need to be verified. At this time, MB needs to calibrate CPL1 and CPL2 once, and HB also needs to calibrate CPL1 and CPL2 once. This will double the calibration time, and in factory operations, it will double the time and labor costs.

[0040] To this end, the present disclosure provides a radio frequency power amplifier circuit. Figure 5 As shown, it includes a transmitting path, a receiving path and a coupling path, as well as a radio frequency input port, a radio frequency output port, a coupling output port and an antenna port; wherein:

[0041] The transmission path is connected to the RF input port and the antenna port, and is used to process the transmission signal input from the RF input port and output it through the antenna port;

[0042] The receiving path is connected to the antenna port and the RF output port, and is used to process the receiving signal input by the antenna port and output it through the RF output port;

[0043] The coupling path is coupled to the transmitting path, and the coupling path is independent of the receiving path, and is used to collect a feedback signal of the transmitting signal and output it through the coupling output port.

[0044] In this embodiment, the coupling path is coupled to a signal path on the transmitting path that is independent of the receiving path. By setting the coupler on the transmitting path and away from the receiving path, when a signal is received through the receiving path, the received signal will not pass through the coupler, thereby preventing the noise of the transmitting signal from falling into the receiving frequency band and avoiding the problem of deterioration of the receiving sensitivity.

[0045] In an exemplary embodiment, the RF input port comprises a first input port, and the transmit path comprises a first transmit path;

[0046] The first transmitting path includes a first amplifying module and a first filtering module, the first amplifying module is connected to the first input port, and is connected to the antenna port through the first filtering module, and the first transmitting path forms a signal path independent of the receiving path between the first amplifying module and the first filtering module;

[0047] The receiving path includes a second amplifying module and a second filtering module connected in sequence, the second amplifying module is connected to the RF output port, and the second filtering module is connected to the antenna port; the second filtering module is configured to filter the received signal input from the antenna port; the second amplifying module is configured to amplify the filtered received signal and output it through the RF output port. When the transmission signal has the same frequency as the reception signal, the second filtering module and the first filtering module can share a filtering module. Optionally, the second amplifying module can be a low noise amplifier.

[0048] The coupling path includes a first coupler, and the first coupler is coupled to the first transmitting path on the signal path between the first amplifying module and the first filtering module. It can be seen that in this example, the coupling path is independent of the receiving path.

[0049] In an exemplary embodiment, the RF input port comprises a first input port, and the transmit path comprises a first transmit path;

[0050] The first transmitting path includes a first amplifying module and a first filtering module, the first amplifying module is connected to the first input port, and is connected to the antenna port through the first filtering module, and the first transmitting path forms a signal path independent of the receiving path between the first filtering module and the antenna port;

[0051] The receiving path includes a second amplifying module and a second filtering module connected in sequence, the second amplifying module is connected to the RF output port, and the second filtering module is connected to the antenna port;

[0052] The coupling path includes a first coupler, which is coupled to the first transmission path on the signal path between the first filter module and the antenna port. Although the position of the first coupler in this example is different from that in the previous embodiment, the coupling path is still independent of the receiving path.

[0053] In an exemplary embodiment, the RF input port includes a first input port and a second input port, and the transmit path includes a first transmit path and a second transmit path;

[0054] The first transmitting path includes a first amplifying module, a first switching unit, a first filtering module, and a second switching unit connected in sequence, the input end of the first amplifying module is connected to the first input port, the output end of the second switching unit is connected to the antenna port, and a first signal path independent of the receiving path is formed between the first amplifying module and the first switching unit; specifically, the input end of the first amplifying module is connected to the first input port, the output end of the first amplifying module is connected to the first filtering module through the first switching unit, the first filtering module may include a plurality of filters, the first switching unit is used to switch the path between the first amplifying module and the plurality of filters, the first filtering module is connected to the antenna port through the second switching unit, and the second switching unit is used to switch the path between the plurality of filters and the antenna port;

[0055] The second transmitting path includes a third amplifying module, a first switching unit, a third filtering module and a second switching unit connected in sequence, the input end of the third amplifying module is connected to the second input port, the output end of the second switching unit is connected to the antenna port, and a second signal path independent of the receiving path is formed between the third amplifying module and the first switching unit; specifically, the input end of the third amplifying module is connected to the second input port, the output end of the third amplifying module is connected to the third filtering module through the first switching unit, the third filtering module is connected to the antenna port through the second switching unit, the third filtering module may include multiple filters, the first switching unit is used to switch the path between the third amplifying module and the multiple filters, the third filtering module is connected to the antenna port through the second switching unit, and the second switching unit is used to switch the path between the multiple filters and the antenna port; optionally, the first transmitting path and the second transmitting path can share the same filtering module;

[0056] The coupling path includes a first coupler and a second coupler, the first coupler is coupled to the first transmitting path on a first signal path between the first amplifying module and the first switching unit, and the second coupler is coupled to the second transmitting path on a second signal path between the second amplifying module and the first switching unit.

[0057] In this example, two transmission paths are included, and each transmission path is coupled through a coupling path independent of the receiving path. Since the coupling paths are independent of the receiving paths and will not interfere with each other, when performing FBRX calibration on the coupler on any coupling path, only the coupler on the path needs to be calibrated, and no calibration is required for other couplers, saving calibration time.

[0058] Optionally, in this example, the antenna port may include a first antenna port and a second antenna port, the second switch unit includes a first output end and a second output end, the first output end is connected to the first antenna port, and the second output end is connected to the second antenna port.

[0059] The first filter module includes multiple filters, the first switch unit is used to switch the path between the first amplification module and the multiple filters, and the second switch unit is used to switch the path between the first filter module and the first antenna port, or the path between the first filter module and the second antenna port.

[0060] In an exemplary embodiment, the RF input port includes a first input port and a second input port, and the transmit path includes a first transmit path and a second transmit path;

[0061] The first transmitting path includes a first amplifying module, a first switching unit, a first filtering module, a second switching unit and a third switching unit connected in sequence, the input end of the first amplifying module is connected to the first input port, the output end of the third switching unit is connected to the antenna port, and a first transmitting signal path and a first receiving sub-path independent of the first transmitting signal path are formed between the second switching unit and the third switching unit; specifically, the input end of the first amplifying module is connected to the first input port, the output end of the first amplifying module is connected to the first filtering module through the first switching unit, the first filtering module may include multiple filters, the first switching unit is used to switch the path between the first amplifying module and the multiple filters, the output end of the first filtering module is connected to the second switching unit, the second switching unit is connected to the antenna port through the third switching unit, and the second switch unit is used to form multiple signal paths with the third switch unit, including: a first transmitting signal path and a first receiving sub-path independent of the first transmitting signal path.

[0062] The second transmitting path includes a third amplifying module, a first switch unit, a third filtering module, a second switching unit and a third switching unit connected in sequence, the input end of the third amplifying module is connected to the second input port, the output end of the third switching unit is connected to the antenna port, and the second switching unit and the third switching unit form a second transmitting signal path and a second receiving sub-path independent of the second transmitting signal path; specifically, the input end of the third amplifying module is connected to the second input port, the output end of the third amplifying module is connected to the third filtering module through the first switch unit, the output end of the third filtering module is connected to the second switch unit, the second switch unit is connected to the antenna port through the third switch unit, and the second switch unit is used to form multiple signal paths with the third switch unit, including: a second transmitting signal path and a second receiving sub-path independent of the second transmitting signal path;

[0063] The coupling path includes a first coupler and a second coupler, the first coupler is coupled to the first transmission path on a first transmission signal path between the second switch unit and the third switch unit, and the second coupler is coupled to the second transmission path on a second transmission signal path between the second switch unit and the third switch unit.

[0064] Optionally, in this example, the antenna port may include a first antenna port and a second antenna port, and the third switch unit includes a first output end and a second output end, the first output end is connected to the first antenna port, and the second output end is connected to the second antenna port. The third switch unit is used to switch the paths between the multiple signal paths and the first antenna port or the paths between the multiple signal paths and the second antenna port.

[0065] In an exemplary embodiment, the first amplifying module is an intermediate frequency amplifier, and the first filtering module is an intermediate frequency bandpass filter; the third amplifying module is a high frequency amplifier, and the third filtering module is a high frequency bandpass filter.

[0066] In an exemplary embodiment, when the transmission signal and the reception signal have the same frequency, the filter module in the transmission path may share a filter module with the filter module in the reception path.

[0067] The radio frequency power amplifier circuit of this embodiment can be applied to a frequency division duplex system or a time division duplex system.

[0068] The disclosed embodiment changes the position of the CPL to prevent the PRX signal from passing through the CPL without affecting the normal function of the CPL, cuts off the noise propagation path, and improves the problem of deterioration of receiving sensitivity. At the same time, this solution will also bring the additional benefit of reducing the FBRX calibration time of the ASDIV function by half.

[0069] Figure 6 This is a schematic diagram of a PA-MiD architecture of an embodiment of the present disclosure. In this example, the coupler is arranged at a position of the transmission path close to the amplification module. In this example, two transmission paths are included, so the RF input port includes two, such as the intermediate frequency RF input port (MB RFIN) and the high frequency RF input port (HB RFIN) in the figure. The RF output port is PRX OUT in the figure. The antenna ports are ANT1 and ANT2 in the figure. The coupler output port is CPL in the figure. The first transmission path can be used to transmit intermediate frequency signals, and the second transmission path can be used to transmit high frequency signals. The first transmission path includes an intermediate frequency amplification module (MBPA in the figure), a first switch unit, a filter module corresponding to the intermediate frequency signal, and a second switch unit. The coupling path includes a first coupler CPL1. In this example, CPL1 is located downstream of the intermediate frequency amplification module and upstream of the first switch unit. The second transmission path includes a high frequency amplification module (HB PA in the figure), a first switch unit, a filter module corresponding to the high frequency signal, and a second switch unit. The coupling path also includes a second coupler CPL2. In this example, CPL2 is located between the high frequency amplification module and the first switch unit.

[0070] In this example, the first transmission path and the second transmission path share the first switch unit and the second switch unit, the first switch unit can output the input signal to the corresponding frequency band filter module according to the signal frequency band, and the second switch unit can output the input signal to the corresponding antenna port according to the signal frequency band. The first switch unit may include one or more switch elements, for example, it may include a switch element MB SW for intermediate frequency signals and a switch element HB SW for high frequency signals. The second switch unit may include one or more switch elements, for example, it may include an antenna selection switch and a single-pole multi-throw switch.

[0071] In an exemplary embodiment, the PA-MiD may also include one or more RF front-end interfaces (RF Front End Interface, RFFE) for software control, which can be used to control PA, LNA, switch unit, etc. The RFFE interface complies with the Mobile Industry Processor Interface (MIPI) Alliance protocol. The RF software configuration can be performed through the RFFE interface, so that the first switch unit and the second switch unit can select the corresponding path to achieve RF path conduction.

[0072] Figure 7 For the embodiment of the present disclosure Figure 6The schematic diagram of the PA-MiD circuit shown is applied to the FDD frequency band. In this embodiment, filter 1 is a B1 TX bandpass filter, filter 2 is a B1 RX bandpass filter, filter 3 is a B40 bandpass filter, and filter 4 is a B41 bandpass filter. Taking the B1 frequency band as an example, the RF signal generated by the RF transceiver is input to the PA-MiD and amplified by the MB PA. The TX signal amplified by the MB PA is detected by CPL1, passes through MB SW (intermediate frequency switch device), filter 1 (B1 TX) and other devices, and is output by ANT1. After CPL1 detection, the FBRX1 signal is obtained and output through the CPL output port. After the RX signal is received by ANT1, it passes through filter 2 (B1 RX) and is directly input to the LNA without passing through the CPL. It can be seen that the receiving path does not include a coupler, and the coupling path is independent of the receiving path.

[0073] Figure 8 For the embodiment of the present disclosure Figure 6 The schematic diagram of PA-MiD applied to TDD frequency band is shown in the figure. Filter 1 is B1 TX bandpass filter, filter 2 is B1 RX bandpass filter, filter 3 is B40 bandpass filter, and filter 4 is B41 bandpass filter. Taking B40 frequency band as an example, the RF signal generated by the RF transceiver is input to PA-MiD and amplified by HB PA. The TX signal amplified by HB PA is detected by CPL2, passes through HB SW (high frequency switch device), filter 3 (B40) and other devices, and is output by ANT1. After CPL2 detection, the FBRX2 signal is obtained and output through the CPL output port. After the RX signal is received by ANT1 and filtered by filter 3 (B40), it is input to LNA by HB SW without passing through CPL.

[0074] By moving the CPL after the PA output and before all switches, the PRX will not pass through the CPL during operation, and the noise propagation path can be directly cut off, completely improving the problem of deterioration of receiving sensitivity caused by the CPL.

[0075] In addition, when implementing the ASDIV function, FBRX calibration is required for both CPL1 and CPL2. Figure 7 and Figure 8 As shown in the figure, since CPL1 is located in the intermediate frequency transmission path and far away from the receiving path, only CPL1 needs to be calibrated for the MB frequency band, and no calibration is required for CPL2. Similarly, since CPL2 is located in the high frequency transmission path and far away from the receiving path, only CPL2 needs to be calibrated for the HB frequency band, and no calibration is required for CPL1. Compared with the traditional solution, the calibration time can be reduced by half.

[0076] The radio frequency power amplifier circuit described in the embodiments of the present disclosure can be applied to 5G radio frequency solutions.

[0077] Fig. 9 The pin diagram of the PA-MiD of the embodiment of the present disclosure is shown in FIG. In addition to multiple input ports (HB_IN and MB_IN in the figure), output ports (MB_TX_OUT1 and MB_TX_OUT2, and HB_TX_OUT in the figure), and coupler output port (CPL in the figure), the PA-MiD may also include multiple clock signal ports (SCLK, or CLK in the figure), multiple control data ports (SDATA, or DATA in the figure), multiple voltage input and output ports (VIO in the figure), a dedicated port for battery working mode (VBATT in the figure), multiple low power amplifier LNA input and output ports (LNA_IN and LNA_OUT in the figure), and multiple ground ports (GND in the figure).

[0078] Fig.10 This is another PA-MiD architecture schematic diagram of an embodiment of the present disclosure. In this example, the coupler is set at a position near the antenna port of the transmission path and is coupled with the transmission path between the second switch unit and the third switch unit. In this example, two transmission paths are included, so the RF input port includes two, such as the intermediate frequency RF input port (MBRFIN) and the high frequency RF input port (HB RFIN) in the figure. The RF output port is PRX OUT in the figure. The antenna ports are ANT1 and ANT2 in the figure. The coupler output port is CPL in the figure. The first transmission path can be used to transmit intermediate frequency signals, and the second transmission path can be used to transmit high frequency signals. The first transmission path includes an intermediate frequency amplification module (MB PA in the figure), a first switch unit, a filtering module corresponding to the intermediate frequency signal, a second switch unit and a third switch unit, and the coupling path includes a first coupler CPL1. In this example, CPL1 is located between the second switch unit and the third switch unit. The second transmission path includes a high frequency amplification module (HB PA in the figure), a first switch unit, a filtering module corresponding to the high frequency signal, a second switch unit and a third switch unit, and the coupling path also includes a second coupler CPL2. In this example, CPL2 is located between the second switch unit and the third switch unit.

[0079] In this example, since there are two transmission paths, two transmission paths and two receiving paths are established between the second switch unit and the third switch unit, and CPL1 and CPL2 are respectively set on one transmission path, so that the receiving path is far away from CPL. By separating the transmission signal path and the receiving signal path, the receiving signal is independent, avoiding noise interference of the signal, thereby avoiding the problem of deterioration of receiving sensitivity.

[0080] The second switch unit includes SW and DP7T (double-pole seven-throw), DP7T includes two input ports and 7 output ports, the transmission path occupies one input port, two of the 7 output ports are used as transmission paths (P1 and P3), each transmission path is used to reflect a transmission signal (TX) of a frequency band, and the two output ports are used as receiving paths (P2 and P4), each receiving path is used to receive a receiving signal (PRX) of a frequency band.

[0081] The third switch unit may include two single-pole double-throw switches, wherein one single-pole double-throw switch is used for switching between TX1 and PRX1, and the other single-pole double-throw switch is used for switching between TX2 and PRX2.

[0082] Pin diagram see Fig. 9 As shown, no further description is given here.

[0083] Fig.11 For the embodiment of the present disclosure Fig.10 The schematic diagram of PA-MiD applied to TDD frequency band is shown. Filter 1 is B1 TX bandpass filter, filter 2 is B1 RX bandpass filter, filter 3 is B40 bandpass filter, and filter 4 is B41 bandpass filter. Taking B40 frequency band as an example, the RF signal generated by the RF transceiver is input to PA-MiD and amplified by HB PA. The TX signal amplified by HBPA is filtered by filter 3 (B40) and output by path P1. After being detected by CPL1, it is combined with the PRX signal by SPDT1 and output by ANT1. After CPL1 detection, the FBRX1 signal is obtained and output through the CPL output port. After the PRX signal is received by ANT1, it passes through SPDT1 and is input to DP7T through path P2. It does not pass through CPL. After being filtered by filter 3 (B40), it is input to LNA by HB SW.

[0084] By adding a receiving path independent of the transmitting path, the received signal will not pass through the CPL, which can directly cut off the noise propagation path and completely improve the deterioration of receiving sensitivity caused by CPL in the TDD frequency band.

[0085] Above Figure 7 , Figure 8 and Fig.11The illustrated embodiment takes the PA-MiD supporting dual connection scenario as an example for explanation. Dual connection means that the mobile terminal can communicate with both 4G and 5G at the same time, including any one of EN-DC, NE-DC, NGEN-DC and carrier aggregation (CA), wherein EN-DC refers to the dual connection between 4G wireless access network and 5G NR, NE-DC refers to the dual connection between 5G NR and 4G wireless access network, and NGEN-DC refers to the dual connection between 4G wireless access network and 5GNR under 5G core network. Among them, DC stands for Dual Connectivity, i.e., Dual Connectivity (DC); E stands for Evolved-UMTS Terrestrial Radio Access (E-UTRA or EUTRA), i.e., 4G wireless access network; N stands for new radio (NR), i.e., 5G new wireless; NG stands for next generation core network (NG), i.e., 5G core network.

[0086] The embodiments of this article are only described by taking B1 and B40 signals as examples, indicating that there are two signals of different frequency bands in the radio frequency link at the same time. The embodiments of this disclosure can be applied to any possible dual-connection or multi-connection scenarios. In addition, this embodiment has no restrictions on the frequency bands of the dual-transmitted signals, which can be any combination of frequency bands, for example, in the form of P+Q, where the P frequency band includes any one of B1, B3, B39, B41, B77, B78, N1, N3, N39, N41, N77, and N78, and the Q frequency band includes any one of the following frequency bands different from the P frequency band: B1, B3, B39, B41, B77, B78, N1, N3, N39, N41, N77, and N78.

[0087] An embodiment of the present disclosure also provides a radio frequency system, including a radio frequency transceiver, and a radio frequency power amplifier circuit and an antenna system according to any of the foregoing embodiments. The signal transmitted by the radio frequency transceiver is processed by the radio frequency power amplifier circuit and then transmitted by the antenna system.

[0088] The embodiments of the present disclosure also provide a wireless communication device including the above-mentioned radio frequency system. The wireless communication device involved in the embodiments of the present disclosure may include various handheld devices with wireless communication functions, vehicle-mounted devices, virtual reality / augmented reality devices, wireless headphones, smart home devices, wearable devices, computing devices or other processing devices connected to a wireless modem, as well as various forms of user equipment (UE) (e.g., mobile phones), mobile stations (MS), terminal devices, etc.

[0089] Among them, smart home devices can be at least one of the following: smart watches, smart speakers, smart TVs, smart refrigerators, smart washing machines, smart lamps, smart toilets, smart rice cookers, smart clothes racks, smart massage chairs, smart furniture, smart sensors, smart doors and windows, smart routers, smart gateways, smart switch panels, etc., without limitation here.

[0090] In the description of the embodiments of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the meanings of the above terms in the present disclosure can be understood according to the circumstances.

Claims

1. A radio frequency power amplifier circuit, characterized in that: It includes a transmitting path, a receiving path and a coupling path, as well as a radio frequency input port, a radio frequency output port, a coupling output port and an antenna port; wherein: The transmitting path is connected to the RF input port and the antenna port, and is used to process the transmitting signal input from the RF input port and output it through the antenna port. Each transmitting path includes an amplifying module and a filtering module. The amplifying module is connected to the RF input port and is connected to the antenna port through the filtering module. The receiving path is connected to the antenna port and the RF output port, and is used to process the received signal input by the antenna port and output it through the RF output port. All receiving paths share one amplification module, and the shared amplification module is connected to the RF output port. The coupling path is coupled to the transmitting path and is independent of the receiving path, and is used to collect the feedback signal of the transmitting signal and output it through the coupling output port. Each coupling path includes a coupler, and all couplers are located inside the RF power amplifier circuit. The coupling path is independent of the receiving path, which means that the receiving signal does not pass through the coupler.

2. The radio frequency power amplifier circuit according to claim 1, characterized in that: The RF input port includes a first input port, and the transmission path includes a first transmission path; The first transmitting path includes a first amplifying module and a first filtering module, the first amplifying module is connected to the first input port, and is connected to the antenna port through the first filtering module, and the first transmitting path forms a signal path independent of the receiving path between the first amplifying module and the first filtering module; The coupling path includes a first coupler, and the first coupler is coupled to the first transmitting path on a signal path between the first amplification module and the first filtering module.

3. The radio frequency power amplifier circuit according to claim 1, characterized in that: The RF input port includes a first input port, and the transmission path includes a first transmission path; The first transmitting path includes a first amplifying module and a first filtering module, the first amplifying module is connected to the first input port, and is connected to the antenna port through the first filtering module, and the first transmitting path forms a signal path independent of the receiving path between the first filtering module and the antenna port; The coupling path includes a first coupler, which is coupled to the first transmitting path on a signal path between the first filtering module and the antenna port.

4. The radio frequency power amplifier circuit according to claim 1, characterized in that: The radio frequency input port includes a first input port and a second input port, and the transmission path includes a first transmission path and a second transmission path; The first transmitting path includes a first amplifying module, a first switching unit, a first filtering module and a second switching unit connected in sequence, the input end of the first amplifying module is connected to the first input port, the output end of the second switching unit is connected to the antenna port, and a first signal path independent of the receiving path is formed between the first amplifying module and the first switching unit; The second transmitting path includes a third amplifying module, a first switching unit, a third filtering module and a second switching unit connected in sequence, the input end of the third amplifying module is connected to the second input port, the output end of the second switching unit is connected to the antenna port, and a second signal path independent of the receiving path is formed between the third amplifying module and the first switching unit; The coupling path includes a first coupler and a second coupler, the first coupler is coupled to the first transmitting path on a first signal path between the first amplifying module and the first switching unit, and the second coupler is coupled to the second transmitting path on a second signal path between the third amplifying module and the first switching unit.

5. The radio frequency power amplifier circuit according to claim 1, characterized in that: The radio frequency input port includes a first input port and a second input port, and the transmission path includes a first transmission path and a second transmission path; The first transmitting path includes a first amplifying module, a first switching unit, a first filtering module, a second switching unit and a third switching unit connected in sequence, the input end of the first amplifying module is connected to the first input port, the output end of the third switching unit is connected to the antenna port, and a first transmitting signal path and a first receiving sub-path independent of the first transmitting signal path are formed between the second switching unit and the third switching unit; The second transmitting path includes a third amplifying module, a first switching unit, a third filtering module, a second switching unit and a third switching unit connected in sequence, the input end of the third amplifying module is connected to the second input port, the output end of the third switching unit is connected to the antenna port, and the second switching unit and the third switching unit form a second transmitting signal path and a second receiving sub-path independent of the second transmitting signal path; The coupling path includes a first coupler and a second coupler, the first coupler is coupled to the first transmission path on a first transmission signal path between the second switch unit and the third switch unit, and the second coupler is coupled to the second transmission path on a second transmission signal path between the second switch unit and the third switch unit.

6. The radio frequency power amplifier circuit according to claim 4, characterized in that: The antenna port includes a first antenna port and a second antenna port, the second switch unit includes a first output end and a second output end, the first output end is connected to the first antenna port, and the second output end is connected to the second antenna port.

7. The radio frequency power amplifier circuit according to claim 5, characterized in that: The antenna port includes a first antenna port and a second antenna port, and the third switch unit includes a first output end and a second output end, the first output end is connected to the first antenna port, and the second output end is connected to the second antenna port.

8. The radio frequency power amplifier circuit according to any one of claims 4 to 7, characterized in that: The first amplifying module is an intermediate frequency amplifier, and the first filtering module is an intermediate frequency bandpass filter; the third amplifying module is a high frequency amplifier, and the third filtering module is a high frequency bandpass filter.

9. The radio frequency power amplifier circuit according to any one of claims 4 to 7, characterized in that: The receiving path includes a second filter module and a second amplification module connected in sequence, the second amplification module is connected to the RF output port, and the second filter module is connected to the antenna port; when the transmission signal and the reception signal have the same frequency, the second filter module and the first filter module share a filter module.

10. A radio frequency system, characterized in that: It comprises a radio frequency transceiver, a radio frequency power amplifier circuit as described in any one of claims 1 to 9, and an antenna system, wherein the signal transmitted by the radio frequency transceiver is processed by the radio frequency power amplifier circuit and then transmitted by the antenna system.

11. A wireless communication device, characterized in that: Comprising the radio frequency system as claimed in claim 10.

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