Radio frequency circuit, radio frequency module and electronic device

Abstract

The application discloses a radio frequency circuit, a radio frequency module and electronic equipment, and belongs to the radio frequency technical field.The radio frequency circuit comprises a first power amplifier and an impedance adjustment module.The impedance adjustment module is connected between the output end of the first power amplifier and an antenna.When the input end of the first power amplifier inputs a high-frequency first input signal, the power amplifier has a higher requirement on the power level, and the impedance adjustment module can be switched to a lower first impedance.When the input end of the first power amplifier inputs a medium-frequency second input signal, the power amplifier has a lower requirement on the power level, and the impedance adjustment module can be switched to a higher second impedance.Thus, by adjusting the impedance between the output end of the first power amplifier and the antenna, the high-frequency signal can be amplified and output to the antenna, and the medium-frequency signal can also be amplified and output to the antenna.

Description

Technical Field

[0001] This application relates to the field of radio frequency technology, and in particular to a radio frequency circuit, radio frequency module and electronic device. Background Technology

[0002] The electronic device includes a radio frequency (RF) module and an antenna. The RF module includes a power amplifier, which amplifies the input signal and outputs the amplified signal to the antenna, thereby transmitting a wireless signal.

[0003] In related technologies, radio frequency (RF) modules include a high-frequency power amplifier for amplifying high-frequency signals and outputting the signal to an antenna, and an intermediate-frequency (IF) power amplifier for amplifying intermediate-frequency (IF) signals and outputting the signal to an antenna. However, because the impedance between the high-frequency power amplifier and the antenna differs from that between the IF power amplifier and the antenna, the high-frequency power amplifier can only amplify high-frequency signals and output the signal to the antenna, but cannot amplify IF signals and output the signal to the antenna. This limits the application scenarios of RF modules. Summary of the Invention

[0004] This application provides a radio frequency (RF) circuit, an RF module, and an electronic device. The RF circuit can amplify high-frequency signals and output signals to an antenna, and it can also amplify intermediate-frequency (IF) signals and output signals to an antenna, thereby improving the integration of the RF circuit and expanding the application scenarios of the RF module. The technical solution is as follows:

[0005] In a first aspect, a radio frequency (RF) circuit is provided. The RF circuit is used to acquire an input signal, process the input signal (e.g., amplify, filter), and output a signal to a first antenna. The RF circuit includes a first power amplifier and an impedance adjustment module.

[0006] The first power amplifier is used to amplify the signal. The input terminal of the first power amplifier is used to input a first input signal or a second input signal. The first input signal has a frequency in a first frequency band, and the second input signal has a frequency in a second frequency band, with the minimum value of the first frequency band being greater than the maximum value of the second frequency band. Here, the first frequency band is a high-frequency band, and the second frequency band is an intermediate-frequency band. That is, when the first input signal of the first frequency band is input to the first power amplifier, the power requirement of the first power amplifier is higher than when the second input signal of the second frequency band is input to the first power amplifier. In some embodiments, the first frequency band is a band between 2300 MHz and 2700 MHz. For example, the first frequency band can be the N41 or B41 band (frequency range of 2496 MHz to 2690 MHz); or, the first frequency band can also be the N40 or B40 band (frequency range of 2300 MHz to 2400 MHz). When the first power amplifier receives a first input signal of the first frequency band, the power rating requirement is PC2. The second frequency band is one of the bands from 1710 MHz to 2025 MHz. For example, the second frequency band can be band B1 or N1 (frequency range from 1920 MHz to 1980 MHz); or, the second frequency band can also be band B3 or N3 (frequency range from 1710 MHz to 1785 MHz). When the first power amplifier receives a second input signal of the second frequency band, the power rating requirement is PC3. The power rating of PC3 is less than that of PC2.

[0007] The output terminal of the first power amplifier is connected to the first terminal of the impedance adjustment module. The second terminal of the impedance adjustment module is used to connect to the first antenna. In this embodiment, the impedance of the impedance adjustment module can be switched between a first impedance and a second impedance. The first impedance is less than the second impedance. The impedance adjustment module is used to adjust the impedance between the output terminal of the first power amplifier and the first antenna. When a first input signal is input to the input terminal of the first power amplifier, since the frequency of the first input signal is within a first frequency band, the power requirement of the first power amplifier is higher, and the impedance adjustment module can switch to a lower first impedance. When a second input signal is input to the input terminal of the first power amplifier, since the frequency of the second input signal is within a second frequency band, the power requirement of the first power amplifier is lower, and the impedance adjustment module can switch to a higher second impedance.

[0008] In this application, the radio frequency (RF) circuit includes a first power amplifier and an impedance adjustment module. The impedance adjustment module is connected between the output terminal of the first power amplifier and a first antenna. When a first input signal of a first frequency band (i.e., high frequency) is input to the input terminal of the first power amplifier, the first power amplifier has a higher power requirement, and the impedance adjustment module can switch to a lower first impedance. When a second input signal of a second frequency band (i.e., intermediate frequency) is input to the input terminal of the first power amplifier, the first power amplifier has a lower power requirement, and the impedance adjustment module can switch to a higher second impedance. This RF circuit, by adjusting the impedance between the output terminal of the first power amplifier and the first antenna, can amplify high-frequency signals and output signals to the antenna, as well as amplify intermediate-frequency signals and output signals to the antenna, thereby improving the integration of the RF circuit and enriching its application scenarios. Thus, when this RF circuit is applied to RF modules and electronic devices, it can also improve the integration of RF modules and electronic devices.

[0009] In some embodiments, the impedance adjustment module includes: a matched filter unit, a first switch, a first filter, a first impedance compensation unit, a second filter, and a second impedance compensation unit.

[0010] The output terminal of the first power amplifier is connected to the first terminal of the matched filter unit. The second terminal of the matched filter unit is connected to the first contact of the first switch. The second contact of the first switch is connected to the first terminal of the first filter. The third contact of the first switch is connected to the first terminal of the first impedance compensation unit. The first switch can be a single-pole double-throw switch, so that either the second or third contact can be connected to the first contact. The second terminal of the first impedance compensation unit is connected to the first terminal of the second filter. The second terminals of both the first and second filters are used to connect to the first antenna. The first filter operates in the first frequency band, and the second filter operates in the second frequency band.

[0011] The matched filter unit includes a first capacitor connected between the output terminal of the first power amplifier and the first contact of the first switch, and a second impedance compensation unit connected in parallel with the first capacitor. In other words, the impedance adjustment module utilizes both the first and second impedance compensation units for impedance adjustment. When the second impedance compensation unit is not operating, and the first and second contacts of the first switch are closed (i.e., the first impedance compensation unit is not operating), the impedance adjustment module switches to the first impedance. When the second impedance compensation unit is operating, and the first and third contacts of the first switch are closed (i.e., the first impedance compensation unit is operating), the impedance adjustment module switches to the second impedance.

[0012] As a first example, the first impedance compensation unit includes a second capacitor and a third capacitor. The first plate of the second capacitor is connected to the third contact of the first switch, and the second plate of the second capacitor is connected to the first terminal of the second filter. The first plate of the third capacitor is connected to the first plate of the second capacitor, and the second plate of the third capacitor is connected to ground.

[0013] As a second example, the first impedance compensation unit includes a fourth capacitor and a first inductor. The first plate of the fourth capacitor is connected to the third contact of the first switch, and the second plate of the fourth capacitor is connected to the first terminal of the second filter. The first terminal of the first inductor is connected to the second plate of the fourth capacitor, and the second terminal of the first inductor is connected to ground.

[0014] In some embodiments, the matched filter unit further includes a second inductor, a third inductor, and a fifth capacitor. The first plate of the first capacitor is connected to the output terminal of the first power amplifier, and the second plate of the first capacitor is connected to the first terminals of both the second and third inductors. The second terminal of the second inductor is connected to ground, and the second terminal of the third inductor is connected to the first contact of the first switch. The first plate of the fifth capacitor is connected to the second terminal of the third inductor, and the second plate of the fifth capacitor is connected to ground.

[0015] In some embodiments, the second impedance compensation unit includes a sixth capacitor and a second switch. The first plate of the sixth capacitor is connected to the first plate of the first capacitor, and the second plate of the sixth capacitor is connected to the first terminal of the second switch. The second terminal of the second switch is connected to the second plate of the first capacitor.

[0016] When the first input signal of the first frequency band is input to the input terminal of the first power amplifier, the second switch is turned off, and the second impedance compensation unit does not work. When the second input signal of the second frequency band is input to the input terminal of the first power amplifier, the second switch is turned on, and the second impedance compensation unit works.

[0017] In some embodiments, the input terminal of the first power amplifier is also used to input a third input signal. The frequency of the third input signal is in a third frequency band. The minimum value of the first frequency band is greater than the maximum value of the third frequency band, and the third frequency band and the second frequency band are two different frequency bands. Here, the third frequency band is a frequency band in the intermediate frequency range, that is, when the first input signal of the first frequency band is input to the input terminal of the first power amplifier, the power level requirement of the first power amplifier is higher than the power level requirement of the first power amplifier when the third input signal of the third frequency band is input to the input terminal of the first power amplifier. In some embodiments, the third frequency band is a frequency band from 1710 MHz to 2025 MHz. For example, the third frequency band can be the B39 band or the N39 band (frequency range from 1880 MHz to 1920 MHz). In this application, although both the second and third frequency bands are frequency bands in the intermediate frequency range, when the third input signal of the third frequency band is input to the input terminal of the first power amplifier, the power requirement of the first power amplifier can be different from the power requirement of the first power amplifier when the second input signal of the second frequency band is input to the input terminal of the first power amplifier. Based on this, the impedance adjustment module can also switch to a third impedance. The first impedance is less than the third impedance. When a third input signal is input to the input terminal of the first power amplifier, since the frequency of the third input signal is within the third frequency band, the power level requirement of the first power amplifier is lower than when the first input signal is input to the input terminal of the first power amplifier. Therefore, the impedance adjustment module can switch to a higher third impedance. In some embodiments, the third impedance can be equal to the second impedance. In other embodiments, the third impedance may not be equal to the second impedance.

[0018] In some embodiments, the impedance adjustment module may further include a third impedance compensation unit, a third filter, and a fourth impedance compensation unit.

[0019] The first switch also has a fourth contact, which is connected to the first terminal of the third impedance compensation unit. Here, the first switch can be a single-pole three-throw switch, allowing any one of the second, third, or fourth contacts to conduct through the first contact. The second terminal of the third impedance compensation unit is connected to the first terminal of the third filter, which is used to connect to the first antenna. The third filter operates in the third frequency band. The fourth impedance compensation unit is connected in parallel with the first capacitor.

[0020] As an example, when the fourth impedance compensation unit is operating and the first and fourth contacts of the first switch are closed (i.e., the third impedance compensation unit is operating), the impedance adjustment module switches to the third impedance. In other words, in this case, if a third input signal is input to the input terminal of the first power amplifier, the fourth impedance compensation unit operates, and the first and fourth contacts of the first switch are closed.

[0021] As another example, when both the second and fourth impedance compensation units are operating, and the first and fourth contacts of the first switch are closed (i.e., the third impedance compensation unit is operating), the impedance adjustment module switches to the third impedance. In other words, in this case, if a third input signal is input to the input terminal of the first power amplifier, both the second and fourth impedance compensation units operate, and the first and fourth contacts of the first switch are closed.

[0022] Secondly, a radio frequency (RF) module is also provided. The RF module can be a chip that packages numerous electronic devices together. Generally, the numerous electronic devices in the RF module constitute at least one RF circuit. In this application, the RF module may include two RF circuits, namely a first RF circuit and a second RF circuit. The first RF circuit is the RF circuit described in any one of the first aspects. The second RF circuit includes a second power amplifier and a fourth filter.

[0023] The second power amplifier is used to amplify the signal. The input terminal of the second power amplifier is used to input a fourth input signal. This fourth input signal operates at a frequency within the fourth frequency band. The minimum value of the first frequency band is greater than the maximum value of the fourth frequency band, and the fourth frequency band differs from the second frequency band. Here, the fourth frequency band is a band within the intermediate frequency range. In some embodiments, the fourth frequency band is a band between 1710 MHz and 2025 MHz. For example, the fourth frequency band can be band B1 or N1 (frequency range 1920 MHz to 1980 MHz); or, the fourth frequency band can also be band B3 or N3 (frequency range 1710 MHz to 1785 MHz). Generally, when the second frequency band is band B1, the fourth frequency band can be band N3; when the second frequency band is band B3, the fourth frequency band can be band N1.

[0024] The output of the second power amplifier is connected to the first terminal of the fourth filter. The second terminal of the fourth filter is used to connect to the second antenna. The fourth filter operates in the fourth frequency band. When the RF module is working, the input terminal of the first power amplifier can receive a second input signal of the B1 frequency band, and the input terminal of the second power amplifier can receive a fourth input signal of the N3 frequency band. At this time, the first RF circuit can process the second input signal and output it to the first antenna, through which the B1 frequency band wireless signal is transmitted. The second RF circuit can process the fourth input signal and output it to the second antenna, through which the N3 frequency band wireless signal is transmitted. In this way, both intermediate frequency 5G signals and intermediate frequency 4G signals can be transmitted simultaneously.

[0025] In some embodiments, as described in the first aspect, the impedance adjustment module may include a matched filter unit, a first switch, a first filter, a first impedance compensation unit, a second filter, and a second impedance compensation unit. In this case, the RF module may further include a fifth filter.

[0026] The first terminal of the fifth filter is connected to the input terminal of the third power amplifier, and the second terminal is connected to the first antenna. The fifth filter operates in the second frequency band. That is, the fifth filter and the second filter form a duplexer. In this case, when a second input signal of the second frequency band is input to the input terminal of the first power amplifier, the second impedance compensation unit operates, and the first and third contacts of the first switch are closed, allowing the first antenna to transmit wireless signals of the second frequency band. When the first antenna receives the wireless signal of the second frequency band, it can output a second received signal. The second received signal is output after passing through the fifth filter and the third power amplifier in sequence. The third power amplifier can be a low-noise amplifier.

[0027] Thirdly, an electronic device is also provided, including a first antenna, a second antenna, and a radio frequency module as described in any one of the second aspects. The second terminal of the impedance adjustment module in the radio frequency module is connected to the first antenna, and the second terminal of the fourth filter is connected to the second antenna.

[0028] It is understood that the beneficial effects of the second and third aspects mentioned above can be found in the relevant descriptions in the first aspect above, and will not be repeated here. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the architecture of an electronic device provided in an embodiment of this application;

[0030] Figure 2 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application;

[0031] Figure 3 This is a schematic diagram of the structure of the first radio frequency module in the related technology;

[0032] Figure 4 This is a schematic diagram of the structure of the second radio frequency module in the related technology;

[0033] Figure 5 This is a schematic diagram of the structure of the third radio frequency module in the related technology;

[0034] Figure 6 This is a circuit diagram of the power amplifier and switch in related technologies;

[0035] Figure 7 yes Figure 6 The equivalent circuit diagram of the circuit structure shown;

[0036] Figure 8 yes Figure 7 The Smith chart of the equivalent circuit when a high-frequency signal is input is shown.

[0037] Figure 9 yes Figure 7 The Smith chart of the equivalent circuit with an input intermediate frequency signal is shown below.

[0038] Figure 10 This is a schematic diagram of the structure of the first radio frequency circuit provided in the embodiments of this application;

[0039] Figure 11 This is a schematic diagram of the structure of the second radio frequency circuit provided in the embodiments of this application;

[0040] Figure 12 This is a circuit structure diagram of the first type of radio frequency circuit provided in the embodiments of this application;

[0041] Figure 13 yes Figure 12 The equivalent circuit diagram of the circuit structure from the output of the first power amplifier to the first end of the second filter is shown in the figure.

[0042] Figure 14 This is a circuit structure diagram of the second type of radio frequency circuit provided in the embodiments of this application;

[0043] Figure 15 yes Figure 14 The equivalent circuit diagram of the circuit structure from the output of the first power amplifier to the first end of the second filter is shown in the figure.

[0044] Figures 16 to 19 yes Figure 13 or Figure 15 The Smith chart of the equivalent circuit with an input intermediate frequency signal is shown below.

[0045] Figure 20 This is a schematic diagram of the structure of the third radio frequency circuit provided in the embodiments of this application;

[0046] Figure 21 This is a circuit structure diagram of the third type of radio frequency circuit provided in the embodiments of this application;

[0047] Figure 22 This is a circuit structure diagram of the fourth type of radio frequency circuit provided in the embodiments of this application;

[0048] Figure 23 This is a device structure diagram of a radio frequency circuit provided in an embodiment of this application;

[0049] Figure 24 This is a schematic diagram of the structure of the first radio frequency module provided in the embodiments of this application;

[0050] Figure 25 This is a schematic diagram of the structure of the second type of radio frequency module provided in the embodiments of this application;

[0051] Figure 26 This is a schematic diagram of the structure of the third type of radio frequency module provided in the embodiments of this application.

[0052] The meanings of the various symbols in the attached icons are as follows:

[0053] 10. Electronic devices;

[0054] 101. Screen and cover plate;

[0055] 102. Shell;

[0056] 103. Internal structure;

[0057] 104. Back cover;

[0058] Related technologies:

[0059] 210. First radio frequency module;

[0060] 220. Second radio frequency module;

[0061] 230. Third radio frequency module;

[0062] This application:

[0063] 30. Radio frequency circuits;

[0064] 302. First device;

[0065] 304. Second device;

[0066] 310. Impedance adjustment module;

[0067] 311. Matched Filtering Unit;

[0068] 312. First impedance compensation unit;

[0069] 313. Second impedance compensation unit;

[0070] 314. Third impedance compensation unit;

[0071] 315. Fourth impedance compensation unit;

[0072] 40. Radio frequency module;

[0073] 42. First radio frequency circuit;

[0074] 44. Second radio frequency circuit;

[0075] 410. Diversity receiving module. Detailed Implementation

[0076] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0077] It should be understood that "multiple" as mentioned in this application refers to two or more. In the description of this application, unless otherwise stated, " / " indicates "or," for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist, for example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, to facilitate a clear description of the technical solutions of this application, the terms "first," "second," etc., are used to distinguish identical or similar items with essentially the same function and effect. Those skilled in the art will understand that the terms "first," "second," etc., do not limit the quantity or execution order, and that "first," "second," etc., do not necessarily imply differences.

[0078] Before providing a detailed explanation of the radio frequency circuits and modules provided in the embodiments of this application, the application scenarios of the radio frequency circuits and modules will be explained first.

[0079] For example, Figure 1 This is a schematic diagram of the architecture of an electronic device 10 provided in an embodiment of this application. Figure 1 As shown, electronic device 10 includes an application subsystem, memory, massive storage, baseband subsystem, radio frequency module, radio frequency integrated circuit (RFIC), and antenna (ANT). These devices can be coupled through various interconnect buses or other electrical connection methods. Here, TX represents the transmit path, RX represents the receive path, and different numbers represent different paths. FBRX represents the feedback receive path, PRX represents the main receive path, and DRX represents the diversity receive path. HB represents high frequency, LB represents low frequency, referring to the relative high and low frequencies. BB represents baseband. It can be understood that... Figure 1 The reference numerals and components are for illustrative purposes only and represent only one possible implementation. Other implementations are also included in the embodiments of this application.

[0080] A radio frequency (RF) module may include electronic components such as switches, antenna tuners, power amplifiers (PA), low-noise amplifiers (LNA), mixers, local oscillators (LO), and filters. The numerous electronic components in the RF module constitute at least one RF circuit. Antennas can sometimes be considered part of the RF module. For ease of explanation, in the embodiments of this application, the RF module does not include an antenna. The RF module can be further divided into an RF receive path and an RF transmit path. The RF receive path operates in downlink mode and is used to receive RF signals through the antenna, process the RF signals (such as amplification and filtering) to obtain baseband signals, and transmit them to the baseband subsystem. The RF transmit path operates in uplink mode and is used to receive baseband signals from the baseband subsystem, process the baseband signals (such as amplification and filtering) to obtain RF signals, and finally radiate the RF signals into space through the antenna.

[0081] The baseband subsystem can extract useful information or data bits from the baseband signal, or convert information or data bits into baseband signals to be transmitted. These information or data bits can represent user data such as voice, text, and video, or control information. For example, the baseband subsystem can perform signal processing operations such as modulation and demodulation, encoding and decoding. Different wireless access technologies, such as 5G New Radio (NR) and 4G Long Term Evolution (LTE), often have slightly different baseband signal processing operations. Therefore, to support the convergence of multiple mobile communication modes, the baseband subsystem may include multiple processing cores or multiple hardware accelerators (HACs). The baseband subsystem is generally integrated into one or more chips; the chip integrating the baseband subsystem is generally called a baseband integrated circuit (BBIC).

[0082] In this embodiment, the baseband subsystem can be a standalone chip, referred to as a modem chip. The hardware components of the baseband subsystem can be manufactured and sold on a modem chip basis. Modem chips are sometimes also referred to as baseband chips or baseband processors. Furthermore, the baseband subsystem can also be further integrated into a system-on-a-chip (SOC), manufactured and sold on a SOC basis. The software components of the baseband subsystem can be built into the chip's hardware components before the chip leaves the factory, or they can be imported into the chip's hardware components from other non-volatile memory after the chip leaves the factory, or these software components can be downloaded and updated online via a network.

[0083] Furthermore, since radio frequency signals are analog signals, and the baseband subsystem primarily processes digital signals, the electronic device 10 also requires an analog-to-digital converter (ADC). The ADC includes an analog-to-digital converter that converts analog signals to digital signals, and a digital-to-analog converter (DAC) that converts digital signals to analog signals. In this embodiment, the ADC can be located within the baseband subsystem.

[0084] The application subsystem can serve as the main control system or main computing system of the electronic device 10, running the main operating system and applications, managing the hardware and software resources of the entire electronic device 10, and providing a user interface. The application subsystem may include one or more processing cores. Furthermore, the application subsystem may also include driver software related to other subsystems (such as the baseband subsystem). The baseband subsystem may also include one or more processing cores, as well as HAC and cache, etc.

[0085] Figure 2 This is a schematic diagram of the structure of an electronic device 10 provided in an embodiment of this application. The electronic device 10 can be a mobile phone, tablet computer, or personal computer (PC), etc. Figure 2 As shown, the electronic device 10 provided in this application embodiment may include, in sequence from top to bottom along the paper, a screen and cover plate 101, a housing 102, an internal structure 103, and a back cover 104.

[0086] The screen and cover plate 101 can be used to realize the display function of the electronic device 10. The housing 102 can serve as the main frame of the electronic device 10, providing rigid support for the electronic device 10. The internal structure 103 can include a collection of electronic and mechanical components that realize the various functions of the electronic device 10. For example, the internal structure 103 can include shielding covers, screws, reinforcing ribs, etc. The back cover 104 can be the rear exterior surface of the electronic device 10, and the back cover 104 can be made of glass, ceramic, plastic, etc. in different implementations. The radio frequency module provided in this application embodiment can be applied to Figure 2 The illustrated electronic device 10 is used to support its wireless communication function. In this embodiment, the radio frequency module includes at least two radio frequency circuits, one of which can amplify high-frequency signals and output signals to an antenna, and also amplify intermediate frequency signals and output signals to an antenna.

[0087] First, let's explain the radio frequency module in the relevant technology.

[0088] Figure 3 This is a schematic diagram of the structure of the first radio frequency module 210 in the related technology. For example... Figure 3 As shown, the first RF module 210 is a low noise amplifier-power amplifier module with an integrated duplexer (L-PAMID). The first RF module 210 has input ports IN1 and IN2, receive ports RX1 and RX2, output ports OUT1, OUT2, and OUT3, antenna ports A1 and A2. The first RF module 210 includes a power amplifier PA1, a switch SW1, filters F1, F2, and F3, a switch SW3, a power amplifier PA2, a switch SW2, filters F4 and F5, and power amplifiers LNA1, LNA2, and LNA3. Power amplifier PA1 is a high-frequency power amplifier used to amplify high-frequency (high band, HB, frequency range of 2300 MHz to 2700 MHz) signals; power amplifier PA2 is an intermediate-frequency (IF) power amplifier used to amplify intermediate-frequency (middle band, MB, frequency range of 1710 MHz to 2025 MHz) signals. Filters F1, F2, and F3 are used to filter the HB signal. Filters F4 and F5 are used to filter the MB signal.

[0089] Taking filter F1 operating in the N41 band (frequency range 2496 MHz to 2690 MHz), filter F2 operating in the N40 band (frequency range 2300 MHz to 2400 MHz), filter F4 operating in the B1 (Band 1) band (frequency range 1920 MHz to 1980 MHz), and filter F5 operating in the B3 band (frequency range 1710 MHz to 1785 MHz) as an example: When the first RF module 210 operates in uplink mode and the first input signal of the N41 band is input to input port IN1, switch SW1 connects the output terminal of power amplifier PA1 to the first terminal of filter F1, and switch SW3 connects the second terminal of filter F1 to antenna port A1. At this time, the first input signal is input from input port IN1, passes through power amplifier PA1, switch SW1, filter F1, and switch SW3 in sequence, and is then output from antenna port A1 to the first antenna (not shown in the figure), causing the first antenna to transmit a wireless signal. When the first RF module 210 operates in uplink mode and the second input signal of the B1 band is input to input port IN2, switch SW2 connects the output of power amplifier PA2 to the first terminal of filter F4, and switch SW3 connects the second terminal of filter F4 to antenna port A2. At this time, the second input signal is input from input port IN2, passes through power amplifier PA2, switch SW2, filter F4 and switch SW3 in sequence, and is then output from antenna port A2 to the second antenna (not shown in the figure), causing the second antenna to transmit a wireless signal.

[0090] When an input signal of frequency band N40 is received at input port IN1, switch SW1 connects power amplifier PA1 to filter F2, and switch SW3 connects filter F2 to antenna port A1 or antenna port A2. When an input signal of frequency band B3 is received at input port IN2, switch SW2 connects power amplifier PA2 to filter F5, and switch SW3 connects filter F5 to antenna port A1 or antenna port A2. Further details are omitted. The first RF module 210 can also operate in downlink mode. When the first RF module 210 operates in downlink mode, the signal received by the antenna, after being filtered, can be input from receiver port RX1 to power amplifier LNA1 and then output from output port OUT1; it can also be input from receiver port RX2 to power amplifier LNA2 and then output from output port OUT2; or it can be directly input to the input terminal of power amplifier LNA3 and then output from output port OUT3.

[0091] As described above, the first radio frequency module 210 includes a power amplifier PA1 for amplifying the HB signal and a power amplifier PA2 for amplifying the MB signal. Thus, the first radio frequency module 210 can achieve 4G and 5G dual-connectivity (ENDC) transmission between HB and MB. However, it cannot achieve ENDC transmission between MB (e.g., the first input signal is in the N1 band and the second input signal is in the B3 band; or the first input signal is in the N3 band and the second input signal is in the B1 band).

[0092] In related technologies, to achieve ENDC transmission between MBs, electronic devices are equipped with features such as... Figure 3 In the case of the first radio frequency module 210 shown, a second radio frequency module 220 is usually also provided. Figure 4 This is a schematic diagram of the structure of the second radio frequency module 220 in the related technology. For example... Figure 4 As shown, the second RF module 220 has an input port IN3 and an antenna port A3. The second RF module 220 includes a power amplifier PA3, a switch SW4, filters F6, F7, and F8, and a switch SW5. The power amplifier PA3 is also an intermediate frequency power amplifier used to amplify the MB signal. Filters F6, F7, and F8 are used to filter the MB signal.

[0093] Taking filter F6 operating in the N1 band (frequency range 1920 MHz to 1980 MHz) and filter F7 operating in the N3 band (frequency range 1710 MHz to 1785 MHz) as an example. When the second RF module 220 operates in uplink mode and the input port IN3 receives a third input signal in the N1 band, switch SW4 connects the output of power amplifier PA3 to the first terminal of filter F6, and switch SW5 connects the second terminal of filter F6 to antenna port A3. At this time, the third input signal enters from input port IN3, passes through power amplifier PA3, switch SW4, filter F6, and switch SW5 in sequence, and is then output from antenna port A3 to the third antenna (not shown in the figure), causing the third antenna to transmit a wireless signal. When the input port IN3 receives an input signal in the N3 band, switch SW4 connects the output of power amplifier PA3 to the first terminal of filter F7, and switch SW5 connects the second terminal of filter F7 to antenna port A3. Further details are omitted. Therefore, it can be seen that when... Figure 3 The power amplifier PA2 in the first RF module 210 shown and Figure 4When the power amplifier PA3 in the second RF module 220 shown operates simultaneously, ENDC transmission between MB and MB can be achieved. However, this scheme for achieving ENDC transmission between MB and MB requires the addition of a second RF module 220 to the first RF module 210, which increases the area of ​​the printed circuit board (PCB) and the cost of the electronic device.

[0094] Figure 5 This is a structural schematic diagram of the third radio frequency module 230 in the related technology. The third radio frequency module 230 is in Figure 3 Based on the first RF module 210 shown, an input port IN3, an antenna port A3, a power amplifier PA3, and a filter F9 are added to enable the third RF module 230 to independently achieve MB and MB ENDC transmission. The power amplifier PA3 is an intermediate frequency power amplifier used to amplify the MB signal. The filter F9 is used to filter the MB signal.

[0095] Taking filter F9 operating in the N1 band (frequency range 1920 MHz to 1980 MHz) as an example: When the third RF module 230 operates in uplink mode and the second input signal of the B3 band is input to input port IN2, switch SW2 connects the output of power amplifier PA2 to the first terminal of filter F5, and switch SW3 connects the second terminal of filter F5 to antenna port A2. At this time, the second input signal is input from input port IN2, passes through power amplifier PA2, switch SW2, filter F5, and switch SW3 in sequence, and is then output from antenna port A2 to the second antenna (not shown in the figure), causing the second antenna to transmit a wireless signal. When the third RF module 230 operates in uplink mode and the third input signal of the N1 band is input to input port IN3, switch SW2 connects the output of power amplifier PA3 to the first terminal of filter F9. At this time, the third input signal is input from input port IN3, passes through power amplifier PA3, switch SW2, and filter F9 in sequence, and is then output from antenna port A3 to the third antenna (not shown in the figure), causing the third antenna to transmit a wireless signal. Therefore, when Figure 5 When power amplifiers PA2 and PA3 in the third RF module 230 shown operate simultaneously, ENDC transmission between MB and MB can be achieved. However, this scheme for achieving ENDC transmission between MB and MB requires the addition of another power amplifier PA3 in the module and modification of switch SW2, which increases the module cost.

[0096] exist Figures 3 to 5 In the related technologies shown, the power amplifier PA1 used to amplify the HB signal is not multiplexed to amplify the MB signal. The reason for this is analyzed below:

[0097] Figure 6 This is a circuit diagram of the power amplifier and switch in related technologies, taking the circuit structure between power amplifier PA1 and switch SW1 as an example. Figure 6 As shown, a matching filter circuit consisting of capacitor C1, inductor L1, inductor L2, and capacitor C2 is connected between power amplifier PA1 and switch SW1. Power amplifier PA1 operates in the frequency range of 2300MHz to 2700MHz, and its power class (PC) requirement is PC2. Therefore, the impedance of the matching filter circuit between power amplifier PA1 and switch SW1 is approximately 2.5Ω. Similarly, a matching filter circuit is also connected between power amplifier PA2 and switch SW2. Power amplifier PA2 operates in the frequency range of 1710MHz to 2025MHz, and its PC requirement is PC3. The power of PC3 is less than that of PC2. Therefore, the impedance of the matching filter circuit between power amplifier PA2 and switch SW2 is approximately 3Ω.

[0098] Figure 7 yes Figure 6 The circuit diagram shown represents the equivalent circuit between power amplifier PA1 and switch SW1. Port1 is the output terminal of power amplifier PA1, with an equivalent impedance of 50Ω. Capacitor C1 has a capacitance of 10.5pF (picofarads). Inductor L1 has an inductance of 0.45nH (nahenries). Inductor L2 has an inductance of 1.5nH. Capacitor C2 has a capacitance of 1.7pF. Resistor R1 is the equivalent resistance of switch SW1, which is 3Ω. Port2 is the first terminal of filter F1 (or filter F2, filter F3), with an equivalent impedance of 50Ω. Figure 8 yes Figure 7 The Smith chart of the equivalent circuit with a high-frequency input signal is shown. Figure 8 In the Smith chart shown, curve ① represents Figure 7 The impedance of the equivalent circuit shown is given when its operating frequency is between 2300MHz and 2700MHz. According to... Figure 8 It can be seen that when Figure 7 When the operating frequency of the equivalent circuit shown is 2500MHz, the impedance of the equivalent circuit is 2.568 + j0.183Ω. That is... Figure 7When the equivalent circuit shown operates at a frequency of 2500MHz, the real part of the impedance is 2.568Ω, and the imaginary part is 0.183Ω, which is close to 0. In this case, the impedance of the matching filter circuit between the power amplifier PA1 and the switch SW1 is approximately 2.5Ω, which meets the power level requirements of the power amplifier when operating in the HB band. Figure 9 yes Figure 7 The Smith chart of the equivalent circuit with an input intermediate frequency signal is shown. Figure 9 In the Smith chart shown, curve ② represents Figure 7 The impedance of the equivalent circuit shown is given when its operating frequency is between 1710MHz and 2020MHz. According to... Figure 9 It can be seen that when Figure 7 When the operating frequency of the equivalent circuit shown is 1950MHz, the impedance of the equivalent circuit is 1.259 - j2.129Ω. That is... Figure 7 When the equivalent circuit shown operates at 1950MHz, the real part of the impedance is 1.259Ω; the imaginary part is 2.129Ω, which is not close to 0. In this case, the impedance of the matching filter circuit located between power amplifier PA1 and switch SW1 is far from 3Ω, therefore it cannot meet the power level requirements when the power amplifier operates in the MB band. Actual testing revealed that... Figure 3 or Figure 5 In the RF module shown, when the HB signal is input to input port IN1, the output power Pout of antenna port A1 is approximately 29 dBm, the gain is 29 dB, and the efficiency is 30%. However, when the MB signal is input to input port IN1, the output power Pout of the same antenna port is approximately 22.6 dBm, the gain is 23 dB, and the efficiency is only 10%.

[0099] Therefore, the power amplifier PA1 used to amplify the HB signal cannot be directly reused to amplify the MB signal. The reasons are as follows: 1. Significant difference in impedance requirements. The power amplifier used to amplify the MB signal requires an output power level of PC3, and its connected matching filter circuit requires an impedance of approximately 3Ω; while the power amplifier used to amplify the HB signal requires an output power level of PC2, and its connected matching filter circuit requires an impedance of approximately 2.5Ω. 2. Significant frequency difference. HB has a higher frequency, and the component values ​​in its matching filter circuit are smaller compared to MB.

[0100] Therefore, this application provides a radio frequency (RF) circuit that can amplify HB signals and output signals to an antenna, as well as amplify MB signals and output signals to an antenna, thereby improving the integration of the RF circuit and enriching the application scenarios of RF module electronic devices.

[0101] The radio frequency (RF) module provided in the embodiments of this application will now be explained in detail. In the embodiments of this application, the RF circuit can be composed of several connected electronic devices. The RF circuit can be packaged together with other electronic devices to form an RF module. In the following embodiments, the RF module is in uplink mode when the RF circuit is operating. That is, the RF circuit is used to acquire input signals, process the input signals (such as amplification, filtering, etc.), and output signals to the first antenna.

[0102] Figure 10 This is a schematic diagram of the structure of a radio frequency circuit 30 provided in an embodiment of this application. Figure 10 As shown, the radio frequency circuit 30 includes a first power amplifier PA1 and an impedance adjustment module 310. The first power amplifier PA1 is used to amplify the signal power. Generally, when the first power amplifier PA1 amplifies the signal power, it only amplifies the signal amplitude. In this embodiment, the input terminal of the first power amplifier PA1 can be used to input a first input signal or a second input signal. The frequency of the first input signal is in a first frequency band, and the frequency of the second input signal is in a second frequency band, with the minimum value of the first frequency band being greater than the maximum value of the second frequency band. Here, the first frequency band is a frequency band in HB, and the second frequency band is a frequency band in MB. That is, when the first input signal of the first frequency band is input to the input terminal of the first power amplifier PA1, the power level requirement of the first power amplifier PA1 is higher than the power level requirement of the first power amplifier PA1 when the second input signal of the second frequency band is input to the input terminal of the first power amplifier PA1. Generally, HB includes multiple frequency bands. The first frequency band can be either N41 or B41 (frequency range 2496MHz to 2690MHz) within HB; or, it can also be either N40 or B40 (frequency range 2300MHz to 2400MHz). When the first input signal of the first frequency band is input to the input terminal of the first power amplifier PA1, the power level requirement for the first power amplifier PA1 is PC2. MB also includes multiple frequency bands. The second frequency band can be either B1 or N1 (frequency range 1920MHz to 1980MHz) within MB; or, it can also be either B3 or N3 (frequency range 1710MHz to 1785MHz) within MB. When the second input signal of the second frequency band is input to the input terminal of the first power amplifier PA1, the power level requirement for the first power amplifier PA1 is PC3. The power of PC3 level is less than the power of PC2 level.

[0103] The output terminal of the first power amplifier PA1 is connected to the first terminal of the impedance adjustment module 310. The second terminal of the impedance adjustment module 310 is used to connect to the first antenna ANT1. In this embodiment, the impedance of the impedance adjustment module 310 can be switched between a first impedance and a second impedance. The first impedance is less than the second impedance. The impedance adjustment module 310 is used to adjust the impedance between the output terminal of the first power amplifier PA1 and the first antenna ANT1. When a first input signal is input to the input terminal of the first power amplifier PA1, since the frequency of the first input signal is within the first frequency band, the power requirement of the first power amplifier PA1 is relatively high, and the impedance adjustment module 310 can switch to a lower first impedance. When a second input signal is input to the input terminal of the first power amplifier PA1, since the frequency of the second input signal is within the second frequency band, the power requirement of the first power amplifier PA1 is relatively low, and the impedance adjustment module 310 can switch to a higher second impedance (relative to the first impedance). In some specific embodiments, the first impedance is about 2.5Ω and the second impedance is about 3Ω. In other words, in this RF circuit 30, when the HB signal is input to the input terminal of the first power amplifier PA1, the impedance of the impedance adjustment module 310 can be switched to 2.5Ω, thereby enabling the first power amplifier PA1 to meet the power level PC2 required when operating with the HB signal. When the MB signal is input to the input terminal of the first power amplifier PA1, the impedance of the impedance adjustment module 310 can be switched to 3Ω, thereby enabling the first power amplifier PA1 to meet the power level PC3 required when operating with the MB signal. This RF circuit 30, by adjusting the impedance between the output terminal of the first power amplifier PA1 and the first antenna ANT1, can amplify and output both the HB and MB signals to the first antenna ANT1, thus improving the integration of the RF circuit 30 and enriching its application scenarios. Therefore, when this RF circuit 30 is applied to RF modules and electronic devices, it can also improve the integration of the RF modules and electronic devices and enrich their application scenarios.

[0104] The following is a detailed explanation of the specific structure of the impedance adjustment module 310.

[0105] Figure 11 This is a schematic diagram of another radio frequency circuit 30 provided in an embodiment of this application. For example... Figure 11 As shown, in some embodiments, the impedance adjustment module 310 may include a matched filter unit 311, a first switch SW1, a first filter F1, a first impedance compensation unit 312, a second filter F2, and a second impedance compensation unit 313.

[0106] The matched filter unit 311 functions to match impedance and filter. The output terminal of the first power amplifier PA1 is connected to the first terminal of the matched filter unit 311. The second terminal of the matched filter unit 311 is connected to the first contact a of the first switch SW1. The second contact b of the first switch SW1 is connected to the first terminal of the first filter F1. The third contact c of the first switch SW1 is connected to the first terminal of the first impedance compensation unit 312. The first switch SW1 can be a single-pole double-throw switch, allowing either the second contact b or the third contact c to conduct with the first contact a. The second terminal of the first impedance compensation unit 312 is connected to the first terminal of the second filter F2. The second terminals of both the first filter F1 and the second filter F2 are used to connect to the first antenna ANT1. In some specific embodiments, such as... Figure 11 As shown, the second terminals of the first filter F1 and the second terminals of the second filter F2 can be connected to the first antenna ANT1 via the third switch SW3. The third switch SW3 includes a first contact a, a second contact b, and a third contact c. The second terminal of the first filter F1 is connected to the second contact b of the third switch SW3, the second terminal of the second filter F2 is connected to the third contact c of the third switch SW3, and the first antenna ANT1 is connected to the first contact a of the third switch SW3. Either the second contact b or the third contact c of the third switch SW3 can be connected to the first contact a. In some embodiments, the impedance adjustment module 310 may also include the third switch SW3. When the impedance adjustment module 310 includes the third switch SW3, the first contact a of the third switch SW3 is the second terminal of the impedance adjustment module 310. When the impedance adjustment module 310 does not include the third switch SW3, the second terminals of the first filter F1 and the second terminals of the second filter F2 together constitute the second terminal of the impedance adjustment module 310. Further details are omitted.

[0107] The first filter F1 operates in the first frequency band, and the second filter F2 operates in the second frequency band. The matched filter unit 311 includes a first capacitor C1 connected between the output terminal of the first power amplifier PA1 and the first contact a of the first switch SW1, and a second impedance compensation unit 313 connected in parallel with the first capacitor C1. In other words, in the impedance adjustment module 310, the first impedance compensation unit 312 and the second impedance compensation unit 313 are responsible for impedance adjustment. When the second impedance compensation unit 313 is not working, and the first contact a and the second contact b of the first switch SW1 are conducting (i.e., the first impedance compensation unit 312 is not working), the impedance adjustment module 310 switches to the first impedance. When the second impedance compensation unit 313 is working, and the first contact a and the third contact c of the first switch SW1 are conducting (i.e., the first impedance compensation unit 312 is working), the impedance adjustment module 310 switches to the second impedance.

[0108] In this embodiment, when a first input signal is input to the input terminal of the first power amplifier PA1, the second impedance compensation unit 313 is not working, and the first contact a and the second contact b of the first switch SW1 are connected, as are the second contact b and the first contact a of the third switch SW3. At this time, the first input signal passes sequentially through the first power amplifier PA1, the matched filter unit 311, the first contact a and the second contact b of the first switch SW1, the first filter F1, the second contact b and the first contact a of the third switch SW3, and is then output to the first antenna ANT1, thereby enabling the first antenna ANT1 to transmit a wireless signal. When a second input signal is input to the input terminal of the first power amplifier PA1, the second impedance compensation unit 313 is working, and the first contact a and the third contact c of the first switch SW1 are connected, as are the third contact c and the first contact a of the third switch SW3. At this time, the first input signal is sequentially passed through the first power amplifier PA1, the matched filter unit 311, the second impedance compensation unit 313, the first contact a and the third contact c of the first switch SW1, the first impedance compensation unit 312, the second filter F2, the third contact c and the first contact a of the third switch SW3, and then output to the first antenna ANT1, thereby enabling the first antenna ANT1 to transmit a wireless signal.

[0109] In the embodiments of this application, the radio frequency circuit 30 includes at least the following two different implementations.

[0110] In the first implementation, Figure 12 This is a circuit structure diagram of a radio frequency circuit 30 provided in an embodiment of this application. For example... Figure 12 As shown, in some embodiments, the matched filter unit 311 further includes a second inductor L2, a third inductor L3, and a fifth capacitor C5. The first plate of the first capacitor C1 is connected to the output terminal of the first power amplifier PA1, and the second plate of the first capacitor C1 is connected to the first terminals of the second inductor L2 and the third inductor L3. The second terminal of the second inductor L2 is connected to ground GND, and the second terminal of the third inductor L3 is connected to the first contact a of the first switch SW1. The first plate of the fifth capacitor C5 is connected to the second terminal of the third inductor L3, and the second plate of the fifth capacitor C5 is connected to ground GND.

[0111] The first impedance compensation unit 312 includes a second capacitor C2 and a third capacitor C3. The first plate of the second capacitor C2 is connected to the third contact c of the first switch SW1, and the second plate of the second capacitor C2 is connected to the first terminal of the second filter F2. The first plate of the third capacitor C3 is connected to the first plate of the second capacitor C2, and the second plate of the third capacitor C3 is connected to the ground wire GND.

[0112] The second impedance compensation unit 313 includes a sixth capacitor C6 and a second switch SW2. The first plate of the sixth capacitor C6 is connected to the first plate of the first capacitor C1, and the second plate of the sixth capacitor C6 is connected to the first terminal of the second switch SW2. The second terminal of the second switch SW2 is connected to the second plate of the first capacitor C1. When the second switch SW2 is off, the second impedance compensation unit 313 is not working. When the second switch SW2 is on, the second impedance compensation unit 313 is working.

[0113] Figure 13 yes Figure 12 The diagram shown is an equivalent circuit diagram of the circuit structure from the output terminal of the first power amplifier PA1 to the first terminal of the second filter F2. That is, Figure 13 The equivalent circuit shown is based on Figure 12 The circuit shown depicts a circuit where the second switch SW2 is closed, and the first contact a and the third contact c of the first switch SW1 are open, excluding the first filter F1, the third switch SW3, and the first antenna ANT1. Port 1 is the output terminal of the first power amplifier PA1, with an equivalent impedance of 50Ω. The first capacitor C1 has a capacitance of 10.5pF. The sixth capacitor C6 has a capacitance of 5pF. The fourth resistor R4 is the equivalent impedance of the second switch SW2, with an equivalent impedance of 1.5Ω. The second inductor L2 has an inductance of 0.45nH. The third inductor L3 has an inductance of 1.5nH. The fifth capacitor C5 has a capacitance of 1.7pF. The first resistor R1 is the equivalent impedance between the first contact a and the third contact c of the first switch SW1, with an equivalent impedance of 3Ω. The third capacitor C3 has a capacitance of 0.7pF. The second capacitor C2 has a capacitance of 3.6pF. Port 2 is the first terminal of the second filter F2, with an equivalent impedance of 50Ω.

[0114] In the second implementation, Figure 14 This is a circuit structure diagram of another radio frequency circuit 30 provided in an embodiment of this application. For example... Figure 14 As shown, in some embodiments, the matched filter unit 311 further includes a second inductor L2, a third inductor L3, and a fifth capacitor C5. The first plate of the first capacitor C1 is connected to the output terminal of the first power amplifier PA1, and the second plate of the first capacitor C1 is connected to the first terminals of the second inductor L2 and the third inductor L3. The second terminal of the second inductor L2 is connected to ground GND, and the second terminal of the third inductor L3 is connected to the first contact a of the first switch SW1. The first plate of the fifth capacitor C5 is connected to the second terminal of the third inductor L3, and the second plate of the fifth capacitor C5 is connected to ground GND.

[0115] The first impedance compensation unit 312 includes a fourth capacitor C4 and a first inductor L1. The first plate of the fourth capacitor C4 is connected to the third contact c of the first switch SW1, and the second plate of the fourth capacitor C4 is connected to the first terminal of the second filter F2. The first terminal of the first inductor L1 is connected to the second plate of the fourth capacitor C4, and the second terminal of the first inductor L1 is connected to the ground wire GND.

[0116] The second impedance compensation unit 313 includes a sixth capacitor C6 and a second switch SW2. The first plate of the sixth capacitor C6 is connected to the first plate of the first capacitor C1, and the second plate of the sixth capacitor C6 is connected to the first terminal of the second switch SW2. The second terminal of the second switch SW2 is connected to the second plate of the first capacitor C1. When the second switch SW2 is off, the second impedance compensation unit 313 is not working. When the second switch SW2 is on, the second impedance compensation unit 313 is working.

[0117] Figure 15 yes Figure 14 The diagram shown is an equivalent circuit diagram of the circuit structure from the output terminal of the first power amplifier PA1 to the first terminal of the second filter F2. That is, Figure 15 The equivalent circuit shown is based on Figure 14 The circuit structure shown is such that the second switch SW2 is closed, and the first contact a and the third contact c of the first switch SW1 are open, excluding the first filter F1, the third switch SW3, and the first antenna ANT1. Port1 is the output terminal of the first power amplifier PA1. The fourth resistor R4 is the equivalent impedance of the second switch SW2. The first resistor R1 is the equivalent impedance between the first contact a and the third contact c of the first switch SW1. Port2 is the first terminal of the second filter F2. According to... Figures 12 to 15 It can be seen that the structure of the first impedance compensation unit 312 is different in the two different implementations of the above-mentioned radio frequency circuit 30.

[0118] Figures 16 to 19 yes Figure 13 or Figure 15 The Smith chart shown is for the equivalent circuit with an input intermediate frequency signal, where the input signal frequency is 1950MHz.

[0119] Figure 16 The Smith chart shown corresponds to Figure 13 The equivalent circuit shown is illustrated. Figure 16In the Smith chart shown, curve ③ represents the impedance change before and after adding the second capacitor C2, starting from port 2 (the first end of the second filter F2). That is, the starting point of curve ③ represents the circuit impedance without the second capacitor C2 when the input signal frequency is 1950MHz. The ending point of curve ③ represents the circuit impedance with the second capacitor C2 added but the third capacitor C3 not added when the input signal frequency is 1950MHz. Curve ④ represents the impedance change before and after adding the third capacitor C3. The starting point of curve ④ is the same as the ending point of curve ③. The ending point of curve ④ represents the circuit impedance after adding the third capacitor C3 when the input signal frequency is 1950MHz. According to... Figure 16 It can be seen that after adding the third capacitor C3 to the circuit, the circuit impedance is 31.2250 - j30.4033Ω. At this time, the real part of the impedance in the circuit is 31.2250Ω, and the imaginary part is -30.4033Ω.

[0120] Figure 17 The Smith chart shown corresponds to Figure 15 The equivalent circuit shown is illustrated. Figure 17 In the Smith chart shown, curve ⑤ represents the impedance change before and after adding the first inductor L1, starting from port 2 (the first end of the second filter F2). That is, the starting point of curve ⑤ represents the circuit impedance without the first inductor L1 when the input signal frequency is 1950MHz. The ending point of curve ⑤ represents the circuit impedance with the first inductor L1 added but without the fourth capacitor C4 when the input signal frequency is 1950MHz. Curve ⑥ represents the impedance change before and after adding the fourth capacitor C4. The starting point of curve ⑥ is the same as the ending point of curve ⑤. The ending point of curve ⑥ represents the circuit impedance after adding the fourth capacitor C4 when the input signal frequency is 1950MHz. According to... Figure 16 and Figure 17 It can be seen that the endpoints of curve ④ and curve ⑥ are almost at the same point. This indicates that the first impedance compensation unit 312, composed of the second capacitor C2 and the third capacitor C3, plays the same role in improving circuit impedance as the first impedance compensation unit 312, composed of the fourth capacitor C4 and the first inductor L1. Figure 17 It can be seen that after adding the fourth capacitor C4 to the circuit, the circuit impedance is 30.0703 - j30.1100Ω. At this time, the real part of the impedance in the circuit is 30.0703Ω, and the imaginary part is -30.1100Ω.

[0121] Figure 18 The Smith chart shown can correspond to Figure 15 The equivalent circuit shown is illustrated. Figure 18In the Smith chart shown, curve ⑦ represents the impedance change after adding the fourth capacitor C4 and then the first resistor R1. The starting point of curve ⑦ and the ending point of curve ⑥ (or the ending point of curve ④) are the same point. The ending point of curve ⑦ represents the impedance of the circuit after adding the first resistor R1 when the input signal frequency is 1950MHz. Curve ⑧ represents the impedance change before and after adding the fifth capacitor C5. The starting point of curve ⑧ and the ending point of curve ⑦ are the same point. The ending point of curve ⑧ represents the impedance of the circuit after adding the fifth capacitor C5 when the input signal frequency is 1950MHz. Curve ⑨ represents the impedance change before and after adding the third inductor L3. The starting point of curve ⑨ and the ending point of curve ⑧ are the same point. The ending point of curve ⑨ represents the impedance of the circuit after adding the third inductor L3 when the input signal frequency is 1950MHz. Curve ⑩ represents the impedance change before and after adding the second inductor L2. The starting point of curve ⑩ and the ending point of curve ⑨ are the same point. The endpoint of curve ⑩ represents the circuit impedance after adding a second inductor L2 when the input signal frequency is 1950MHz. This represents the impedance change before and after adding the first capacitor C1. (Curve) The starting point of curve ⑩ and the ending point of curve ⑩ are the same point. The endpoint represents the circuit impedance after adding the first capacitor C1 when the input signal frequency is 1950MHz. According to... Figure 18 It can be seen that after including the first inductor L1, the fourth capacitor C4, the first resistor R1, the fifth capacitor C5, the third inductor L3, the second inductor L2, and the first capacitor C1 in the circuit, the impedance of the circuit is 2.81049 - j2.44706Ω. At this time, the real part of the impedance in the circuit is 2.81049Ω, which is close to 3Ω; but the imaginary part is -2.44706Ω, which is not 0. Therefore, the imaginary part needs to be eliminated by the second impedance compensation unit 313.

[0122] Figure 19 The Smith chart shown can correspond to Figure 15 The equivalent circuit shown is illustrated. Figure 19 In the Smith chart shown, after adding the second impedance compensation unit 313, which consists of the sixth capacitor C6 and the fourth resistor R4, the curve... The endpoint has changed. According to Figure 19 It can be seen that at this time, Figure 15 The equivalent circuit shown has an impedance of 2.959 + j0.063Ω. In this case, the real part of the impedance is 2.959Ω, close to 3Ω; the imaginary part is 0.063Ω, close to 0. Therefore, for... Figure 12 or Figure 14The circuit structure shown indicates that when the second switch SW2 is closed and the first contact a and the third contact c of the first switch SW1 are connected, if the second input signal is input to the input terminal of the first power amplifier PA1, the impedance of the impedance adjustment module 310 is approximately 3Ω, which meets the power level requirements of the first power amplifier PA1 when operating in the MB frequency band. However, when the second switch SW2 is open and the first contact a and the second contact b of the first switch SW1 are connected, the equivalent circuit of the impedance adjustment module 310 is... Figure 7 The equivalent circuit shown is the same. In this case, according to... Figure 8 As shown in the Smith chart, if the first input signal is input to the input terminal of the first power amplifier PA1, the impedance of the impedance adjustment module 310 is approximately 2.5Ω, which meets the power level requirements of the first power amplifier PA1 when operating in the HB band. Therefore, the RF circuit 30 provided in this embodiment can amplify both high-frequency signals and intermediate-frequency signals by adjusting the impedance between the output terminal of the first power amplifier PA1 and the first antenna ANT1, thereby improving the integration of the RF circuit 30 and enriching its application scenarios. In other words, the RF circuit 30 provided in this embodiment can multiplex the power amplifier PA1 used for amplifying HB signals to amplify MB signals, thus reducing PCB area and saving costs when the RF circuit 30 is applied to the RF module 40.

[0123] The impedance adjustment module 310 in the radio frequency circuit 30 provided in the embodiments of this application will be further expanded below.

[0124] In some embodiments, the input terminal of the first power amplifier PA1 is also used to input a third input signal. The frequency of the third input signal is in a third frequency band. The minimum value of the first frequency band is greater than the maximum value of the third frequency band, and the third frequency band and the second frequency band are two different frequency bands. Here, the third frequency band is a frequency band in MB, that is, when the first input signal of the first frequency band is input to the input terminal of the first power amplifier PA1, the power level requirement of the first power amplifier PA1 is higher than the power level requirement of the first power amplifier PA1 when the third input signal of the third frequency band is input to the input terminal of the first power amplifier PA1. In some embodiments, the third frequency band is a frequency band from 1710MHz to 2025MHz. For example, the third frequency band can be the B39 band or the N39 band (frequency range of 1880MHz to 1920MHz). In this application, although both the second and third frequency bands are intermediate frequency bands, when the input terminal of the first power amplifier PA1 receives a third input signal of the third frequency band, the power requirement of the first power amplifier PA1 may differ from the power requirement of the first power amplifier PA1 when the input terminal receives a second input signal of the second frequency band. Based on this, the impedance of the impedance adjustment module 310 can also be switched to the third impedance. The first impedance is less than the third impedance. The third impedance may be equal to or different from the second impedance; this is not limited here. When the input terminal of the first power amplifier PA1 receives a third input signal, since the frequency of the third input signal is within the third frequency band, the power requirement of the first power amplifier PA1 is lower than when the input terminal receives the first input signal. Therefore, the impedance adjustment module 310 can switch to a higher third impedance (relative to the first impedance).

[0125] Figure 20 This is a schematic diagram of another radio frequency circuit 30 provided in an embodiment of this application. For example... Figure 20 As shown, in order to enable the impedance adjustment module 310 to switch to a higher third impedance (relative to the first impedance), the impedance adjustment module 310 may also include a third impedance compensation unit 314, a third filter F3 and a fourth impedance compensation unit 315.

[0126] The first switch SW1 also has a fourth contact d, which is connected to the first terminal of the third impedance compensation unit 314. Here, the first switch SW1 can be a single-pole three-throw switch, allowing any one of the second contact b, the third contact c, and the fourth contact d to conduct with the first contact a. The second terminal of the third impedance compensation unit 314 is connected to the first terminal of the third filter F3, which is used to connect to the first antenna ANT1. In some specific embodiments, such as... Figure 20As shown, the third switch SW3 also has a fourth contact d, which is connected to the second terminal of the third filter F3. The third switch SW3 can be a single-pole three-throw switch, so that any one of the second contact b, the third contact c, and the fourth contact d can be connected to the first contact a. The third filter F3 operates in the third frequency band. The fourth impedance compensation unit 315 is connected in parallel with the first capacitor C1.

[0127] exist Figure 20 In the RF circuit 30 shown, as a first example, when the fourth impedance compensation unit 315 is working and the first contact a and the fourth contact d of the first switch SW1 are conducting (i.e., the third impedance compensation unit 314 is working), the impedance adjustment module 310 switches to the third impedance. That is, in this example, when a third input signal is input to the input terminal of the first power amplifier PA1, the second impedance compensation unit 313 is not working, the fourth impedance compensation unit 315 is working, and the first contact a and the fourth contact d of the first switch SW1 are conducting, as are the fourth contact d and the first contact a of the third switch SW3. At this time, the third input signal sequentially passes through the first power amplifier PA1, the matched filter unit 311, the fourth impedance compensation unit 315, the first contact a and the fourth contact d of the first switch SW1, the third impedance compensation unit 314, the third filter F3, and the fourth contact d and the first contact a of the third switch SW3 before being output to the first antenna ANT1, thereby causing the first antenna ANT1 to transmit a wireless signal.

[0128] As a second example, when both the second impedance compensation unit 313 and the fourth impedance compensation unit 315 are working, and the first contact a and the fourth contact d of the first switch SW1 are conducting (i.e., the third impedance compensation unit 314 is working), the impedance adjustment module 310 switches to the third impedance. In other words, in this example, when a third input signal is input to the input terminal of the first power amplifier PA1, the second impedance compensation unit 313 and the fourth impedance compensation unit 315 are working, and the first contact a and the fourth contact d of the first switch SW1 are conducting, as are the fourth contact d and the first contact a of the third switch SW3. At this time, the third input signal sequentially passes through the first power amplifier PA1, the matched filter unit 311, the second impedance compensation unit 313, the fourth impedance compensation unit 315, the first contact a and the fourth contact d of the first switch SW1, the third impedance compensation unit 314, the third filter F3, and the fourth contact d and the first contact a of the third switch SW3 before being output to the first antenna ANT1, thereby enabling the first antenna ANT1 to transmit a wireless signal.

[0129] Figure 21 and Figure 22 These are circuit structure diagrams of two different radio frequency circuits 30 provided in the embodiments of this application. For example... Figure 21 andFigure 22 As shown, the fourth impedance compensation unit 315 may include a ninth capacitor C9 and a fourth switch SW4 connected in series. When the fourth switch SW4 is off, the fourth impedance compensation unit 315 is not operational. When the fourth switch SW4 is on, the fourth impedance compensation unit 315 is operational. As an example, such as... Figure 21 As shown, the third impedance compensation unit 314 includes a seventh capacitor C7 and an eighth capacitor C8. The first plate of the seventh capacitor C7 is connected to the fourth contact d of the first switch SW1, and the second plate of the seventh capacitor C7 is connected to the first terminal of the third filter F3. The first plate of the eighth capacitor C8 is connected to the first plate of the seventh capacitor C7. The second plate of the eighth capacitor C8 is connected to ground GND. As another example, ... Figure 22 As shown, the third impedance compensation unit 314 includes a tenth capacitor C10 and a fourth inductor L4. The first plate of the tenth capacitor C10 is connected to the fourth contact d of the first switch SW1, and the second plate of the tenth capacitor C10 is connected to the first terminal of the third filter F3. The first terminal of the fourth inductor L4 is connected to the second plate of the tenth capacitor C10, and the second terminal of the fourth inductor L4 is connected to ground GND.

[0130] It is understandable that: First, based on Figures 20 to 22 The circuit structure of the radio frequency circuit 30 shown can be understood by those skilled in the art. Figure 12 or Figure 14 Multiple impedance compensation units are added to the RF circuit 30 shown to allow the impedance adjustment module 310 to switch to multiple different impedances. Secondly, in the above embodiment, the impedance adjustment module 310 is described as being able to adjust from a smaller first impedance to a larger second impedance (or third impedance) so that the power amplifier used to amplify the HB signal can be reused to amplify the MB signal. In other embodiments, the impedance adjustment module 310 can also be adjusted from a larger second impedance (or third impedance) to a smaller first impedance so that the power amplifier used to amplify the MB signal can be reused to amplify the HB signal. Thirdly, in the above embodiment, the second terminal of the first filter F1 and the second terminal of the second filter F2 are both used to connect to the same antenna (i.e., the first antenna ANT1). In other embodiments, the second terminals of the first filter F1 and the second terminals of the second filter F2 can also be connected to different antennas. These are reasonable improvements that those skilled in the art can make based on the RF circuit 30 of this application, and should be understood as being within the protection scope of the embodiments of this application.

[0131] Figure 23 This is a device structure diagram of a radio frequency circuit 30 provided in an embodiment of this application. For example... Figure 23As shown, in practical applications, the radio frequency circuit 30 may include a first device 302, a second device 304, and multiple inductors and capacitors.

[0132] The first device 302 can be a semiconductor device made of gallium arsenide (GaAs). The first device 302 integrates a first power amplifier PA1, a first capacitor C1, and a sixth capacitor C6. The first device 302 also has ports B1 and B2. The first capacitor C1 and the sixth capacitor C6 can be implemented on a GaAs die. The first plate of both the first capacitor C1 and the sixth capacitor C6 are connected to the output terminal of the first power amplifier PA1.

[0133] The second device 304 can be a semiconductor device made of silicon on insulator (SOI). The second device 304 integrates a first switch SW1 and a second switch SW2. The second device 304 also has ports B3, B4, B5, B6, and B7. The second switch SW2 is located between ports B3 and B4. The first switch SW1 can be a single-pole double-throw switch, located between ports B5, B6, and B7, so that any one of ports B6 or B7 can be connected to port B5. Port B1 is connected to port B3, and port B4 is connected to port B2. Port B6 is connected to the first terminal of the first filter F1. Port B7 is connected to the first plates of the second capacitor C2 and the third capacitor C3. The second plate of the second capacitor C2 is connected to the first terminal of the second filter F2, and the second plate of the third capacitor C3 is connected to ground GND. The first terminal of the third inductor L3 is connected to port B2, and the second terminal of the third inductor L3 is connected to port B5. The first plate of the fifth capacitor C5 is connected to port B5, and the second plate of the fifth capacitor C5 is connected to ground GND. The first terminal of the second inductor L2 is connected to port B2, and the second terminal of the second inductor L2 is connected to ground GND.

[0134] The second inductor L2 and the third inductor L3 can be wire-wound inductors or surface-mount inductors. The second capacitor C2, the third capacitor C3, and the fifth capacitor C5 can be surface-mount capacitors. The first device 302, the second device 304, the second inductor L2, the third inductor L3, the second capacitor C2, the third capacitor C3, the fifth capacitor C5, the first filter F1, and the second filter F2 can be located on the same PCB board, thus achieving connection through the PCB board.

[0135] The RF circuit 30 provided in this application embodiment has at least the following advantages: 1. By adjusting the impedance between the output terminal of the first power amplifier PA1 and the first antenna ANT1, both high-frequency signals can be amplified and output to the antenna, and intermediate-frequency signals can also be amplified and output to the antenna. In other words, the impedance between the output terminal of the first power amplifier PA1 and the first antenna ANT1 is adjustable, thus making the frequency range used by the first power amplifier PA1 adjustable, which can improve the operating frequency range and integration of the RF circuit 30. 2. When this RF circuit 30 is applied to the RF module 40, only the first power amplifier PA1 and another power amplifier for amplifying the MB signal are needed to achieve MB-MB ENDC transmission, which can reduce the area occupied by the RF module 40 on the PCB board, save the cost of electronic devices, and enrich the application scenarios of the RF module 40.

[0136] This application also provides a radio frequency (RF) module 40. The RF module 40 can be a chip that packages together a variety of electronic devices. Generally, the various electronic devices in the RF module 40 constitute at least one RF circuit. Figure 24 This is a schematic diagram of the structure of a radio frequency module 40 provided in an embodiment of this application, as shown below. Figure 24 As shown in the embodiments of this application, the radio frequency module 40 may include two radio frequency circuits, namely a first radio frequency circuit 42 and a second radio frequency circuit 44. The first radio frequency circuit 42 is the radio frequency circuit 30 as described in any of the above embodiments. The second radio frequency circuit 44 includes a second power amplifier PA2 and a fourth filter F4.

[0137] The second power amplifier PA2 is used to amplify the signal power. Generally, when the second power amplifier PA2 amplifies the signal, it only amplifies the signal amplitude. The input terminal of the second power amplifier PA2 is used to input the fourth input signal. The fourth input signal operates at a frequency in the fourth frequency band. The minimum value of the first frequency band is greater than the maximum value of the fourth frequency band, and the fourth frequency band is different from the second frequency band. Here, the fourth frequency band is a frequency band within the MB. That is, when the first power amplifier PA1 receives the first input signal of the first frequency band, the power level requirement of the first power amplifier PA1 is higher than the power level requirement of the second power amplifier PA2 when the input terminal receives the fourth input signal of the fourth frequency band. Generally, the MB includes multiple frequency bands; the fourth frequency band can be the B1 or N1 band of the MB (frequency range 1920MHz to 1980MHz); or, the fourth frequency band can also be the B3 or N3 band of the MB (frequency range 1710MHz to 1785MHz). Generally, when the second frequency band is B1, the fourth frequency band can be N3; when the second frequency band is B3, the fourth frequency band can be N1. When the input terminal of the second power amplifier PA2 receives the fourth input signal of the fourth frequency band, the power rating requirement for the second power amplifier PA2 can be PC3.

[0138] The RF module 40 has a first input port IN1, a second input port IN2, a first antenna port A1, and a second antenna port A2. The input terminal of the first power amplifier PA1 in the first RF circuit 42 is connected to the first input port IN1. The output terminal of the impedance adjustment module 310 in the first RF circuit 42 is connected to the first antenna port A1. The first antenna port A1 is used to connect to the first antenna ANT1 (not shown in the figure). The input terminal of the second power amplifier PA2 in the second RF circuit 44 is connected to the second input port IN2. The output terminal of the second power amplifier PA2 is connected to the first terminal of the fourth filter F4. The second terminal of the fourth filter F4 is connected to the second antenna port A2. The second antenna port A2 is used to connect to the second antenna ANT2 (not shown in the figure). The fourth filter F4 operates in the fourth frequency band.

[0139] The RF module 40 includes the following two operating modes:

[0140] In the first operating mode, the first input port IN1 is used to input the HB signal, and the impedance adjustment module 310 can switch to a lower first impedance; the second input port IN2 is used to input the MB signal. In this case, the first input port IN1 can input a first input signal, such as a signal in the N41 band, and the second input port IN2 can input a fourth input signal, such as a signal in the B1 band. At this time, the first RF circuit 42 can process the first input signal and output it from the first antenna port A1 to the first antenna ANT1, thereby enabling the first antenna ANT1 to transmit a wireless signal. The second RF circuit 44 can process the fourth input signal and output it from the second antenna port A2 to the second antenna ANT2, thereby enabling the second antenna ANT2 to transmit a wireless signal. In this way, the ENDC of HB and MB can be realized.

[0141] In the second operating mode, the first input port IN1 is used to input the MB signal, and the impedance adjustment module 310 can switch to a higher second impedance; the second input port IN2 is used to input the MB signal. In this case, the first input port IN1 can input a second input signal, such as a signal from the N3 band, and the second input port IN2 can input a fourth input signal, such as a signal from the B1 band. At this time, the first RF circuit 42 can process the second input signal and output it from the first antenna port A1 to the first antenna ANT1, thereby enabling the first antenna ANT1 to transmit a wireless signal. The second RF circuit 44 can process the fourth input signal and output it from the second antenna port A2 to the second antenna ANT2, thereby enabling the second antenna ANT2 to transmit a wireless signal. In this way, the ENDC of MB and MB can be realized.

[0142] Figure 25 and Figure 26 These are schematic diagrams illustrating the structures of two different radio frequency modules 40 provided in embodiments of this application. Figure 25 As shown, in some embodiments, as previously described, the impedance adjustment module 310 in the first RF circuit 42 of the RF module 40 may include a second filter F2. In this case, the RF module 40 may also include a fifth filter F5.

[0143] The first terminal of the fifth filter F5 is used to connect to the input terminal of the third power amplifier LNA1. In some embodiments, such as Figure 25 As shown, the third power amplifier LNA1 is also integrated into the RF module 40. The third power amplifier LNA1 is a low-noise amplifier. In other embodiments, such as Figure 26As shown, the RF module 40 is used to connect with other diversity receiving modules 410. A third power amplifier LNA1 (not shown) can be integrated into the diversity receiving module 410. The second terminal of the fifth filter F5 is used to connect to the first antenna ANT1. The fifth filter F5 operates in the second frequency band. That is, the fifth filter F5 and the second filter F2 form a duplexer. In this case, when the RF module 40 operates in uplink mode and the input terminal of the first power amplifier PA1 receives a second input signal of the second frequency band, the second impedance compensation unit 313 operates, and the first contact a and the third contact c of the first switch SW1 are turned on, and the third contact c and the first contact a of the third switch SW3 are turned on, thereby enabling the first antenna ANT1 to transmit wireless signals of the second frequency band. When the RF module 40 operates in downlink mode and the first antenna ANT1 receives wireless signals of the second frequency band, the first antenna ANT1 can convert the received wireless signal into a second received signal. The second received signal is output after passing through the fifth filter F5 and the third power amplifier LNA1 in sequence.

[0144] The following is combined Figure 25 The operating modes of the radio frequency module 40 provided in this embodiment will be further described below. In this example, the radio frequency module 40 can operate in both uplink and downlink modes.

[0145] like Figure 25 As shown, the RF module 40 has a first input port IN1, a second input port IN2, a receive port RX1, a first output port OUT1, a second output port OUT2, a first antenna port A1, and a second antenna port A2. In this embodiment, both the first input port IN1 and the second input port IN2 are used for input signals. The receive port RX1 is used for receiving signals. The first output port OUT1 and the second output port OUT2 are used for output signals. The first antenna port A1 is used to connect to the first antenna ANT1. The second antenna port A2 is used to connect to the second antenna ANT2. The second filter F2 and the fifth filter F5 operate in the N1 band of MB; the first filter F1 operates in the N41 band of HB; the seventh filter F7 operates in the N40 band of HB; the fourth filter F4 and the eighth filter F8 operate in the B3 band; the ninth filter F9 and the tenth filter F10 operate in the B1 band; and the eleventh filter F11 and the twelfth filter F12 operate in the B2 band.

[0146] Uplink Mode 1: The first input port IN1 is used to input the first input signal of the N41 frequency band. In this case, the second switch SW2 is open, the first contact a and the second contact b of the first switch SW1 are closed, and the second contact b and the first contact a of the third switch SW3 are closed. At this time, the first input signal passes sequentially through the first power amplifier PA1, the matched filter unit 311 (including the first capacitor C1, the second inductor L2, the third inductor L3 and the fifth capacitor C5, excluding the sixth capacitor C6), the first switch SW1, the first filter F1 and the third switch SW3, and is output from the first antenna port A1 to the first antenna ANT1, thereby enabling the first antenna ANT1 to transmit a wireless signal.

[0147] Uplink Mode 2: The first input port IN1 is used to input the first input signal of the N40 band. In this case, the second switch SW2 is open, the first contact a and the fourth contact d of the first switch SW1 are closed, and the fourth contact d and the first contact a of the third switch SW3 are closed. At this time, the first input signal passes sequentially through the first power amplifier PA1, the matched filter unit 311 (including the first capacitor C1, the second inductor L2, the third inductor L3 and the fifth capacitor C5, excluding the sixth capacitor C6), the first switch SW1, the seventh filter F7 and the third switch SW3, and is output from the first antenna port A1 to the first antenna ANT1, thereby enabling the first antenna ANT1 to transmit a wireless signal.

[0148] Uplink Mode 3: The first input port IN1 is used to input the second input signal of the N1 frequency band. In this case, the second switch SW2 is closed, the first contact a and the third contact c of the first switch SW1 are connected, and the third contact c and the first contact a of the third switch SW3 are connected. At this time, the second input signal passes sequentially through the first power amplifier PA1, the matched filter unit 311 (including the first capacitor C1, the second inductor L2, the third inductor L3, the fifth capacitor C5, the sixth capacitor C6 and the second switch SW2), the first switch SW1, the first impedance compensation unit 312 (including the second capacitor C2 and the third capacitor C3), the second filter F2 and the third switch SW3, and is output from the first antenna port A1 to the first antenna ANT1, thereby enabling the first antenna ANT1 to transmit a wireless signal.

[0149] Uplink Mode 4: The second input port IN2 is used to input the fourth input signal in the B3 band. In this case, the first contact a and the third contact c of the fifth switch SW5 are turned on, and the fifth contact e and the seventh contact g of the third switch SW3 are turned on. At this time, the fourth input signal passes sequentially through the second power amplifier PA2, the fifth switch SW5, the fourth filter F4, and the third switch SW3, and is output from the second antenna port A2 to the second antenna ANT2, thereby enabling the second antenna ANT2 to transmit a radio signal.

[0150] Uplink Mode 5: The second input port IN2 is used to input the fourth input signal of the B1 band. In this case, the first contact a and the second contact b of the fifth switch SW5 are turned on, and the fifth contact e and the seventh contact g of the third switch SW3 are turned on. At this time, the fourth input signal passes sequentially through the second power amplifier PA2, the fifth switch SW5, the ninth filter F9, and the third switch SW3, and is output from the second antenna port A2 to the second antenna ANT2, thereby enabling the second antenna ANT2 to transmit a radio signal.

[0151] Uplink Mode 6: The second input port IN2 is used to input the fourth input signal of the B2 band. In this case, the first contact a and the fourth contact d of the fifth switch SW5 are turned on, and the sixth contact f and the seventh contact g of the third switch SW3 are turned on. At this time, the fourth input signal passes sequentially through the second power amplifier PA2, the fifth switch SW5, the eleventh filter F11, and the third switch SW3, and is output from the second antenna port A2 to the second antenna ANT2, thereby enabling the second antenna ANT2 to transmit a radio signal.

[0152] Downlink Mode 1: The first antenna ANT1 is used to receive wireless signals in the N1 band. In this mode, the first contact a and the third contact c of the third switch SW3 are connected, the third contact c and the first contact a of the sixth switch SW6 are connected, and the second contact b and the fourth contact d (or the third contact c) of the eighth switch SW8 are connected. At this time, the first antenna ANT1 receives the wireless signal and generates a second received signal. The second received signal passes through the third switch SW3 and the fifth filter F5, and is input from the receive port RX1 and the sixth switch SW6 to the third power amplifier LNA1. After passing through the eighth switch SW8, it is output from the second output port OUT2.

[0153] Downlink Mode 2: The second antenna ANT2 is used to receive radio signals in the B3 band. In this mode, the seventh contact g and the fifth contact e of the third switch SW3 are connected, the second contact b and the first contact a of the seventh switch SW7 are connected, and the first contact a and the third contact c of the eighth switch SW8 are connected. At this time, the second antenna ANT2 receives the radio signal and generates a fourth received signal. The fourth received signal passes through the third switch SW3, the eighth filter F8, the seventh switch SW7, the fourth power amplifier LNA2, and the eighth switch SW8, and is then output from the first output port OUT1.

[0154] Downlink Mode 3: The second antenna ANT2 is used to receive radio signals in the B1 band. In this mode, the seventh contact g and the fifth contact e of the third switch SW3 are connected, the third contact c and the first contact a of the seventh switch SW7 are connected, and the first contact a and the third contact c of the eighth switch SW8 are connected. At this time, the second antenna ANT2 receives the radio signal and generates the fourth received signal. The fourth received signal passes through the third switch SW3, the tenth filter F10, the seventh switch SW7, the fourth power amplifier LNA2, and the eighth switch SW8, and is then output from the first output port OUT1.

[0155] Downlink Mode 4: The second antenna ANT2 is used to receive radio signals in the B2 band. In this mode, the seventh contact g and the sixth contact f of the third switch SW3 are connected, the fourth contact d and the first contact a of the seventh switch SW7 are connected, and the first contact a and the third contact c of the eighth switch SW8 are connected. At this time, the second antenna ANT2 receives radio signals and generates a fourth received signal. The fourth received signal passes through the third switch SW3, the twelfth filter F12, the seventh switch SW7, the fourth power amplifier LNA2, and the eighth switch SW8, and is then output from the first output port OUT1.

[0156] Any of the above uplink modes can be combined with any of the above downlink modes. Combining any of uplink modes 1 and 2 with any of uplink modes 4, 5, and 6 enables ENDC transmission of HB and MB. Combining uplink mode 3 with any of uplink modes 4, 5, and 6 enables ENDC transmission of MB.

[0157] Figure 26 The structure of the radio frequency module 40 shown is compared to Figure 25 The structure of the radio frequency module 40 shown differs only in that: 1. Figure 25 The first terminal of the fifth filter F5 is connected to the receiving port RX1; Figure 26 The first terminal of the fifth filter F5 is connected to the diversity receiver module 410. 2. Figure 25 The second terminal of the second filter F2, the second terminal of the fifth filter F5, and the second terminal of the first filter F1 are all used to connect to the first antenna ANT1 through the third switch SW3. Figure 26 The second terminal of the second filter F2 and the second terminal of the fifth filter F5 are used for connection to the third antenna ANT3, and the second terminal of the first filter F1 is used for connection to the first antenna ANT1 via the third switch SW3. That is to say, in Figure 26 In the embodiment shown, the second end of the first filter F1 and the second end of the second filter F2 are respectively connected to different antennas.

[0158] The RF module 40 provided in this application embodiment has at least the following advantages: 1. The first power amplifier PA1 can amplify high-frequency signals and output signals to the antenna, and can also amplify intermediate frequency signals and output signals to the antenna. That is, the frequency range used by the first power amplifier PA1 is adjustable, which can improve the operating frequency range and integration of the RF circuit 30. 2. Only the first power amplifier PA1 and the second power amplifier PA2 are needed to realize the ENDC transmission of MB and MB, which can reduce the area occupied by the RF module 40 on the PCB board, save the cost of electronic devices, and enrich the application scenarios of the RF module 40.

[0159] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A radio frequency circuit, characterized by The application relates to a power amplifier and an impedance adjustment module. The output end of the first power amplifier is connected with the first end of the impedance adjustment module, the second end of the impedance adjustment module is used for being connected with a first antenna, the input end of the first power amplifier is used for inputting a first input signal of a first frequency band or a second input signal of a second frequency band, the impedance of the impedance adjustment module can be switched between a first impedance and a second impedance, the minimum value of the first frequency band is greater than the maximum value of the second frequency band, and the first impedance is smaller than the second impedance. When the input end of the first power amplifier inputs the first input signal, the impedance adjustment module is switched to the first impedance; when the input end of the first power amplifier inputs the second input signal, the impedance adjustment module is switched to the second impedance. The first frequency band is one frequency band in high frequency, the frequency range of the high frequency is 2300-2700 MHz, and the second frequency band is one frequency band in medium frequency, the frequency range of the medium frequency is 1710-2025 MHz. The impedance adjustment module comprises a matching filter unit, a first switch, a first filter, a first impedance compensation unit, a second filter and a second impedance compensation unit. The output end of the first power amplifier is connected with the first end of the matching filter unit, the second end of the matching filter unit is connected with the first contact of the first switch, the second contact of the first switch is connected with the first end of the first filter, the third contact of the first switch is connected with the first end of the first impedance compensation unit, the second end of the first impedance compensation unit is connected with the first end of the second filter, the second end of the first filter and the second end of the second filter are used for being connected with the first antenna, the first filter works in the first frequency band, and the second filter works in the second frequency band. The matching filter unit comprises a first capacitor connected between the output end of the first power amplifier and the first contact of the first switch, and the second impedance compensation unit is connected with the first capacitor in parallel. When the second impedance compensation unit does not work and the first contact and the second contact of the first switch are conducted, the impedance adjustment module is switched to the first impedance; when the second impedance compensation unit works and the first contact and the third contact of the first switch are conducted, the impedance adjustment module is switched to the second impedance. The first impedance compensation unit comprises a second capacitor and a third capacitor.

2. The radio frequency circuit of claim 1, wherein, The first plate of the second capacitor is connected with the third contact of the first switch, and the second plate of the second capacitor is connected with the first end of the second filter. The first plate of the third capacitor is connected with the first plate of the second capacitor, and the second plate of the third capacitor is connected with a ground wire. The first impedance compensation unit comprises a fourth capacitor and a first inductor.

3. The radio frequency circuit of claim 1, wherein, The first plate of the fourth capacitor is connected with the third contact of the first switch, and the second plate of the fourth capacitor is connected with the first end of the second filter. ​ The first end of the first inductor is connected with the second pole plate of the fourth capacitor, and the second end of the first inductor is connected with a ground wire.

4. The radio frequency circuit of claim 1, wherein, The matching filter unit further comprises a second inductor, a third inductor and a fifth capacitor. The first pole plate of the first capacitor is connected with the output end of the first power amplifier, and the second pole plate of the first capacitor is connected with the first end of the second inductor and the first end of the third inductor; the second end of the second inductor is connected with a ground wire, and the second end of the third inductor is connected with the first contact of the first switch; the first pole plate of the fifth capacitor is connected with the second end of the third inductor, and the second pole plate of the fifth capacitor is connected with a ground wire.

5. The radio frequency circuit of claim 1, wherein, The second impedance compensation unit comprises a sixth capacitor and a second switch. The first pole plate of the sixth capacitor is connected with the first pole plate of the first capacitor, the second pole plate of the sixth capacitor is connected with the first end of the second switch, and the second end of the second switch is connected with the second pole plate of the first capacitor. When the input end of the first power amplifier inputs the first input signal of the first frequency band, the second switch is turned off; when the input end of the first power amplifier inputs the second input signal of the second frequency band, the second switch is turned on.

6. The radio frequency circuit of claim 1, wherein, The input end of the first power amplifier is further used for inputting a third input signal of a third frequency band, the minimum value of the first frequency band is greater than the maximum value of the third frequency band, and the third frequency band is different from the second frequency band. The impedance adjustment module further comprises a third impedance compensation unit, a third filter and a fourth impedance compensation unit. The first switch further has a fourth contact, the fourth contact of the first switch is connected with the first end of the third impedance compensation unit, the second end of the third impedance compensation unit is connected with the first end of the third filter, the second end of the third filter is used for being connected with the first antenna, and the third filter works in the third frequency band; the fourth impedance compensation unit is connected with the first capacitor in parallel. When the input end of the first power amplifier inputs the third input signal, the fourth impedance compensation unit works, and the first contact and the fourth contact of the first switch are turned on, so that the impedance adjustment module is switched to a third impedance; or, when the input end of the first power amplifier inputs the third input signal, the second impedance compensation unit and the fourth impedance compensation unit both work, and the first contact and the fourth contact of the first switch are turned on, so that the impedance adjustment module is switched to the third impedance. The first impedance is less than the third impedance.

7. A radio frequency module, characterized by It comprises: a first radio frequency circuit and a second radio frequency circuit; The first radio frequency circuit is the radio frequency circuit as claimed in any one of claims 1 to 6, and the second radio frequency circuit comprises a second power amplifier and a fourth filter. An output terminal of the second power amplifier is connected with a first terminal of the fourth filter, a second terminal of the fourth filter is used for being connected with a second antenna; an input terminal of the second power amplifier is used for inputting a fourth input signal of a fourth frequency band, a minimum value of the first frequency band is greater than a maximum value of the fourth frequency band, and the fourth frequency band is different from the second frequency band; the fourth filter works in the fourth frequency band.

8. The radio module of claim 7, wherein the first and second conductive layers are formed of a conductive material selected from the group consisting of copper, aluminum, silver, gold, and combinations thereof. The fourth frequency band is one of 1710 megahertz to 2025 megahertz.

9. The radio module of claim 7 or 8, wherein the first and second conductive layers are formed of a conductive material selected from the group consisting of copper, aluminum, silver, gold, and combinations thereof. The radio frequency module further comprises a fifth filter, a first terminal of the fifth filter is used for being connected with an input terminal of a third power amplifier, and a second terminal of the fifth filter is used for being connected with the first antenna; the fifth filter works in the second frequency band.

10. An electronic device, comprising: The radio frequency module comprises a first antenna, a second antenna, and a radio frequency module as claimed in any one of claims 7 to 9. A second terminal of the impedance adjustment module is connected with the first antenna, and a second terminal of the fourth filter is connected with the second antenna.

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