Radio frequency signal generation method and device, and radio frequency transmitter

Abstract

The embodiment of the invention provides a radio frequency signal generation method and device and a radio frequency transmitter, and the method comprises the steps: carrying out the frequency mixing of an initial signal with a first local oscillator signal and a second local oscillator signal, and obtaining a first output signal; the first output signal is subjected to resonance filtering through a target filtering parameter, a second output signal is obtained, the target filtering parameter is set to be used for restraining third harmonic waves generated in the signal transmission process, and the first harmonic waves are used for restraining second harmonic waves generated in the signal transmission process. The second harmonic and the third harmonic are harmonic components that generate a third-order intermodulation signal and a mirror signal. According to the invention, the problem that the efficiency of suppressing the interference signal in the output signal is low is solved, and the effect of improving the efficiency of suppressing the interference signal in the output signal is achieved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of communications, and in particular, to a method and device for generating a radio frequency signal and a radio frequency transmitter. Background Art

[0002] With the development of modern wireless communication, the signal bandwidth has increased significantly. In the commonly used zero intermediate frequency transceiver, the frequency of the local oscillator signal sent to the mixer has also been continuously increased. In the zero intermediate frequency transmitter link, the local oscillator signal input to the up-conversion mixer is a square wave signal, a square wave signal with a non-50% duty cycle. Its second harmonic and the desired signal after up-mixing (i.e., RF (Radio Frequency) signal) flow into the power amplifier. Due to the nonlinearity of the power amplifier, an image signal is generated, i.e., IRR signal; the third and fifth harmonics of the square wave signal, the signals generated after up-mixing flow into the power amplifier together with the desired signal. Due to the nonlinearity of the power amplifier, a third-order intermodulation signal is generated, i.e., CIM3 (Counter Intermodulation) signal. The image signal and the intermodulation signal generate interference on the left side of the RF signal (RF-2IF (intermediate frequency, intermediate frequency signal) and RF-4IF), respectively, affecting the transmission of the RF signal.

[0003] In the prior art, the processing method for suppressing interference signals can generally only suppress a single interference signal, but other interference signals may appear in the output signal.

[0004] With regard to the problem of low efficiency in suppressing interference signals in output signals in the related art, no effective solution has been proposed yet. Summary of the invention

[0005] The embodiments of the present invention provide a method and device for generating a radio frequency signal and a radio frequency transmitter, so as to at least solve the problem of low efficiency in suppressing interference signals in output signals in the related art.

[0006] According to an embodiment of the present invention, there is provided a method for generating a radio frequency signal, comprising:

[0007] Mixing the initial signal with the first local oscillator signal and the second local oscillator signal respectively to obtain a first output signal, wherein the duty cycle of the first local oscillator signal and the duty cycle of the second local oscillator signal are both target duty cycles, the phase of the first local oscillator signal differs from the phase of the second local oscillator signal by a target phase, the first local oscillator signal and the second local oscillator signal have the same signal properties except for the phase, and the target duty cycle and the target phase are set to suppress the first harmonic and the second harmonic generated during signal transmission;

[0008] The first output signal is resonantly filtered using target filtering parameters to obtain a second output signal, wherein the target filtering parameters are set to suppress the third harmonic generated during signal transmission, wherein the first harmonic, the second harmonic and the third harmonic are harmonic components that generate third-order intermodulation signals and image signals.

[0009] In an exemplary embodiment, the mixing of the initial signal with the first local oscillator signal and the second local oscillator signal to obtain the first output signal includes:

[0010] Mixing the initial signal with the first local oscillator signal to obtain a first mixed signal, and mixing the initial signal with the second local oscillator signal to obtain a second mixed signal;

[0011] The first output signal includes the first mixing signal and the second mixing signal, the first harmonic and the second harmonic are two harmonics in a harmonic set that generates a third-order intermodulation signal and an image signal, the third harmonic is a harmonic in the harmonic set other than the two harmonics, and the harmonic set includes a second harmonic, a third harmonic and a fifth harmonic.

[0012] In an exemplary embodiment, the method further comprises:

[0013] The target duty cycle is 20%, and the target phase is π / 3; or,

[0014] The target duty cycle is 1 / 3, and the target phase is π / 5; or,

[0015] The target duty cycle is 50%, and the target phase is π / 3; or,

[0016] The target duty cycle is 50%, and the target phase is π / 5.

[0017] In an exemplary embodiment, mixing the initial signal with the first local oscillator signal to obtain a first mixed signal, and mixing the initial signal with the second local oscillator signal to obtain a second mixed signal includes:

[0018] The initial signal and the first local oscillator signal are input into a first mixer to obtain the first mixed signal output by the first mixer, and the initial signal and the second local oscillator signal are input into a second mixer to obtain the second mixed signal output by the second mixer, wherein a phase of the second local oscillator signal lags behind a phase of the first local oscillator signal by π / 3, or a phase of the second local oscillator signal lags behind a phase of the first local oscillator signal by π / 5.

[0019] In an exemplary embodiment, the step of performing resonant filtering on the first output signal using a target filtering parameter to obtain a second output signal includes:

[0020] The first output signal is input into a filter to obtain the second output signal output by the filter, wherein the filter includes a first filtering path and a second filtering path, the first filtering path is used to transmit the third harmonic in the first output signal to a ground terminal, and the second filtering path is used to transmit other signals in the first output signal except the third harmonic to an output terminal of the filter, the resonant frequency of the first filtering path is the frequency of the third harmonic of the first local oscillator signal, the resonant frequency of the second filtering path is the fundamental frequency of the first local oscillator signal, and the target filtering parameters include the resonant frequency of the first filtering path and the resonant frequency of the second filtering path.

[0021] In an exemplary embodiment, inputting the first output signal into a filter to obtain the second output signal output by the filter includes:

[0022] The first output signal is input to the input end of the filter, wherein the input end of the filter is connected to the output end of the filter via a transmission path, the first filtering path comprises a first inductor and a capacitor, the first inductor and the capacitor are sequentially connected in series between the transmission path and the ground end, the second filtering path comprises a second inductor, the second inductor is connected between the transmission path and the ground end, and the second inductance of the second inductor is n times the first inductance of the first inductor, wherein n=m 2 -1, m is the harmonic order of the third harmonic;

[0023] The signal outputted from the output terminal of the filter is determined as the second output signal.

[0024] In an exemplary embodiment, inputting the first output signal into a filter to obtain the second output signal output by the filter includes:

[0025] The first mixing signal and the second mixing signal are input into the first subcircuit included in the filter to obtain the first filtered signal, and the first mixing signal and the second mixing signal are input into the second subcircuit included in the filter to obtain the second filtered signal, wherein the first mixing signal is obtained by mixing the initial signal with the first local oscillator signal, and the second mixing signal is obtained by mixing the initial signal with the second local oscillator signal, the first subcircuit includes a first subpath and a second subpath, the second subcircuit includes a third subpath and a fourth subpath, the first filtering path includes the first subpath and the third subpath, and the second filtering path includes the second subpath and the fourth subpath.

[0026] In an exemplary embodiment, after performing resonance filtering on the first output signal using the target filtering parameter to obtain the second output signal, the method further includes:

[0027] The first filtered signal is input into a positive input terminal of a power amplifier, and the second filtered signal is input into a negative input terminal of the power amplifier to obtain a target radio frequency signal at an output terminal of the power amplifier.

[0028] According to another embodiment of the present invention, there is provided a device for generating a radio frequency signal, comprising: a mixer and a filter, wherein:

[0029] The output end of the mixer is connected to the input end of the filter;

[0030] The mixer is used to input an initial signal, a first local oscillator signal and a second local oscillator signal, wherein the duty cycle of the first local oscillator signal and the duty cycle of the second local oscillator signal are both target duty cycles, the phase of the first local oscillator signal differs from the phase of the second local oscillator signal by a target phase, the first local oscillator signal and the second local oscillator signal have the same signal properties except for the phase, and the target duty cycle and the target phase are set to suppress the first harmonic and the second harmonic generated during signal transmission; the initial signal is mixed with the first local oscillator signal and the second local oscillator signal respectively to obtain a first output signal; and the first output signal is output;

[0031] The filter is used to input the first output signal; perform resonant filtering on the first output signal using target filtering parameters to obtain a second output signal, wherein the target filtering parameters are set to suppress the third harmonic generated during signal transmission; and output the second output signal, wherein the first harmonic, the second harmonic and the third harmonic are harmonic components that generate third-order intermodulation signals and image signals.

[0032] In an exemplary embodiment, the mixer includes: a first mixer and a second mixer, wherein:

[0033] The output end of the first mixer and the output end of the second mixer are both connected to the input end of the filter, the initial signal is input to one input end of the first mixer, the first local oscillator signal is input to the other input end of the first mixer, the initial signal is input to one input end of the second mixer, and the second local oscillator signal is input to the other input end of the second mixer;

[0034] The first mixer is used to mix the initial signal with the first local oscillator signal to obtain a first mixed signal;

[0035] The second mixer is used to mix the initial signal with the second local oscillator signal to obtain a second mixed signal;

[0036] The first output signal includes the first mixing signal and the second mixing signal, the first harmonic and the second harmonic are two harmonics in a harmonic set that generates a third-order intermodulation signal and an image signal, the third harmonic is a harmonic in the harmonic set other than the two harmonics, and the harmonic set includes a second harmonic, a third harmonic and a fifth harmonic.

[0037] In an exemplary embodiment, the device is further configured to:

[0038] The target duty cycle is 20%, the target phase is π / 3, and the phase of the second local oscillator signal lags behind the phase of the first local oscillator signal; or,

[0039] The target duty cycle is 1 / 3, the target phase is π / 5, and the phase of the second local oscillator signal lags behind the phase of the first local oscillator signal;

[0040] The target duty cycle is 50%, the target phase is π / 3, and the phase of the second local oscillator signal lags behind the phase of the first local oscillator signal; or,

[0041] The target duty cycle is 50%, the target phase is π / 5, and the phase of the second local oscillation signal lags behind the phase of the first local oscillation signal.

[0042] In an exemplary embodiment, the filter comprises: a transmission path, a first filtering path and a second filtering path, wherein:

[0043] The input end of the filter is connected to the output end of the filter through the transmission path, the first filter path includes a first inductor and a capacitor, the first inductor and the capacitor are connected in series between the transmission path and the ground end in sequence, the second filter path includes a second inductor, the second inductor is connected between the transmission path and the ground end, the first filter path resonates at the frequency of the third harmonic, and the second filter path resonates at the fundamental frequency of the first local oscillator signal.

[0044] In an exemplary embodiment, the second inductance of the second inductor is n times the first inductance of the first inductor, where n=m 2 -1, m is the harmonic order of the third harmonic.

[0045] In an exemplary embodiment, the filter comprises: a first subcircuit and a second subcircuit, wherein the first subcircuit comprises a first subpath and a second subpath, the second subcircuit comprises a third subpath and a fourth subpath, the first filtering path comprises the first subpath and the third subpath, and the second filtering path comprises the second subpath and the fourth subpath;

[0046] The input end of the first subcircuit is one input end of the filter, the input end of the second subcircuit is another input end of the filter, the output end of the first subcircuit is one output end of the filter, and the output end of the second subcircuit is another output end of the filter;

[0047] The first sub-circuit is configured to input a first mixing signal and a second mixing signal, wherein the first mixing signal is obtained by mixing the initial signal with the first local oscillator signal, and the second mixing signal is obtained by mixing the initial signal with the second local oscillator signal; filter a combined signal of the first mixing signal and the second mixing signal to obtain a first filtered signal; and output the first filtered signal;

[0048] The second sub-circuit is used to input the first mixing signal and the second mixing signal; filter the combined signal of the first mixing signal and the second mixing signal to obtain a second filtered signal; and output the second filtered signal, wherein the second output signal includes the first filtered signal and the second filtered signal.

[0049] In an exemplary embodiment, the device further comprises: a power amplifier, wherein:

[0050] The power amplifier comprises: a positive input terminal, a negative input terminal and a radio frequency output terminal;

[0051] The positive input terminal is used to input the first filtered signal;

[0052] The negative input terminal is used to input the second filtered signal;

[0053] The radio frequency output terminal is used to output a target radio frequency signal.

[0054] According to another embodiment of the present invention, a radio frequency transmitter is provided, characterized in that the radio frequency transmitter comprises the radio frequency signal generating device and the signal transmitter in any one of the above items, wherein the signal transmitter is used to transmit the signal generated by the radio frequency signal generating device.

[0055] Through the present invention, the initial signal is first mixed with the first local oscillator signal and the second local oscillator signal of the target duty ratio and the target phase that can suppress the first harmonic and the second harmonic, first the first harmonic and the second harmonic generated during the signal transmission process are filtered out, and then the first output signal that has filtered out the first harmonic and the second harmonic is resonantly filtered using the target filtering parameters that are set to suppress the third harmonic, and the third harmonic of the first output signal is filtered out, so that the harmonic components of the third-order intermodulation signal and the mirror signal generated by the initial signal during the transmission process: the first harmonic, the second harmonic and the third harmonic are all suppressed, thereby suppressing the third-order intermodulation signal and the mirror signal of the radio frequency signal at the same time. Therefore, the problem of low efficiency in suppressing interference signals in the output signal is solved, and the effect of improving the efficiency of suppressing interference signals in the output signal is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a hardware structure block diagram of a mobile terminal of a method for generating a radio frequency signal according to an embodiment of the present invention;

[0057] Figure 2 is a flow chart of a method for generating a radio frequency signal according to an embodiment of the present invention;

[0058] Figure 3 is a schematic diagram of harmonic distribution after a first local oscillator signal and a second local oscillator signal are superimposed according to an optional implementation manner of the present invention;

[0059] Figure 4 is a simulation schematic diagram of a local oscillator signal after passing through a filter according to an optional implementation manner of the present invention;

[0060] Figure 5 is a schematic diagram of a radio frequency signal generating device according to an embodiment of the present invention;

[0061] Figure 6 is a schematic diagram of a radio frequency signal generating device according to an optional implementation manner of the present application;

[0062] Figure 7 is a signal schematic diagram of a first local oscillator signal and a second local oscillator signal according to an optional implementation manner of the present invention;

[0063] Figure 8 is a schematic diagram of a filter circuit according to an optional embodiment of the present invention;

[0064] Fig. 9 is a schematic diagram of a method for generating a radio frequency signal according to an optional embodiment of the present invention;

[0065] Fig.10 is a structural block diagram of a device for generating a radio frequency signal according to an embodiment of the present invention. DETAILED DESCRIPTION

[0066] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and in combination with the embodiments.

[0067] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0068] The method embodiments provided in the embodiments of the present application can be executed in an electronic device involving radio frequency signal processing, such as a mobile terminal, a computer terminal, or a similar computing device. In one example, the electronic device includes a radio frequency transmitter link (such as a wifi (WIreless Fidelity) radio frequency transmitter link), and the method according to the embodiments of the present application is executed by the radio frequency transmitter link. Taking running on a mobile terminal as an example, Figure 1 FIG. 1 is a hardware structure block diagram of a mobile terminal of a method for generating a radio frequency signal according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1 Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the mobile terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown.

[0069] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the method for generating radio frequency signals in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, to implement the above method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories may be connected to the mobile terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0070] The transmission device 106 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0071] In this embodiment, a method for generating a radio frequency signal running on the above mobile terminal is provided. Figure 2 is a flow chart of a method for generating a radio frequency signal according to an embodiment of the present invention. Figure 2 As shown, the process includes the following steps:

[0072] Step S202, mixing the initial signal with the first local oscillator signal and the second local oscillator signal respectively to obtain a first output signal, wherein the duty cycle of the first local oscillator signal and the duty cycle of the second local oscillator signal are both target duty cycles, the phase of the first local oscillator signal differs from the phase of the second local oscillator signal by a target phase, the first local oscillator signal and the second local oscillator signal have the same signal properties except the phase, and the target duty cycle and the target phase are set to suppress the first harmonic and the second harmonic generated during signal transmission;

[0073] Step S204, resonant filtering is performed on the first output signal using target filtering parameters to obtain a second output signal, wherein the target filtering parameters are set to suppress the third harmonic generated during signal transmission, wherein the first harmonic, the second harmonic and the third harmonic are harmonic components that generate third-order intermodulation signals and image signals.

[0074] Through the above steps, the initial signal is first mixed with the first local oscillator signal and the second local oscillator signal of the target duty cycle and the target phase that are set to suppress the first harmonic and the second harmonic, and the first harmonic and the second harmonic generated during the signal transmission process are first filtered out, and then the first output signal that has filtered out the first harmonic and the second harmonic is resonantly filtered using the target filtering parameters that are set to suppress the third harmonic, and the third harmonic of the first output signal is filtered out, so that the harmonic components of the third-order intermodulation signal and the mirror signal generated by the initial signal during the transmission process: the first harmonic, the second harmonic and the third harmonic are all suppressed, thereby suppressing the third-order intermodulation signal and the mirror signal of the radio frequency signal at the same time. Therefore, the problem of low efficiency in suppressing interference signals in the output signal is solved, and the effect of improving the efficiency of suppressing interference signals in the output signal is achieved.

[0075] Exemplarily, the execution subject of the above steps may be a radio frequency integrated circuit, a zero intermediate frequency transmitter link, a wifi transmitter link, etc., but is not limited thereto. In the embodiment of the present invention, the application to a wifi transmitter link is used as an example for description.

[0076] In the technical solution provided in the above step S202, the first local oscillator signal and the second local oscillator signal may be, but not limited to, equal-amplitude carrier waves generated by the local device (i.e., the local device where the RF signal generation function is located), or may be signals generated by a local oscillator such as a crystal oscillator. The first local oscillator signal and the second local oscillator signal may be, but not limited to, used for frequency mixing, frequency multiplication, frequency division, etc. The first local oscillator signal and the second local oscillator signal have the same signal properties except for the phase. The first local oscillator signal and the second local oscillator signal may be obtained by dividing the same local oscillator signal into two paths and delaying one path by the target phase. Alternatively, two completely identical local oscillator signals may be generated according to the target duty cycle, and one of the signals may be delayed by the target phase.

[0077] Optionally, in this embodiment, the first harmonic may be, but is not limited to, one of the second harmonic, the third harmonic, and the fifth harmonic, and the second harmonic may be, but is not limited to, one of the second harmonic, the third harmonic, and the fifth harmonic.

[0078] Optionally, in this embodiment, the initial signal can be mixed with two square wave signals (i.e., the first local oscillator signal and the second local oscillator signal) set to a target duty cycle and having a target phase difference to obtain a first output signal with suppressed first harmonics and second harmonics, but is not limited to the mixing.

[0079] In an exemplary embodiment, the initial signal can be mixed with the first local oscillator signal and the second local oscillator signal respectively to obtain a first output signal in the following manner but is not limited to: the initial signal is mixed with the first local oscillator signal to obtain a first mixed signal, and the initial signal is mixed with the second local oscillator signal to obtain a second mixed signal; wherein the first output signal includes the first mixed signal and the second mixed signal, the first harmonic and the second harmonic are two harmonics in a harmonic set that generates a third-order intermodulation signal and an image signal, the third harmonic is a harmonic in the harmonic set other than the two harmonics, and the harmonic set includes a second harmonic, a third harmonic and a fifth harmonic.

[0080] Optionally, in this embodiment, the initial signal may be mixed with the first local oscillator signal to obtain a first mixed signal with the first harmonic suppressed, and the initial signal may be mixed with the second local oscillator signal to obtain a second mixed signal with the second harmonic suppressed; or the initial signal may be mixed with the first local oscillator signal to obtain a first mixed signal with the second harmonic suppressed, and the initial signal may be mixed with the second local oscillator signal to obtain a second mixed signal with the first harmonic suppressed.

[0081] Optionally, in this embodiment, if the first harmonic is the second harmonic and the second harmonic is the third harmonic, the third harmonic may be the fifth harmonic; if the first harmonic is the second harmonic and the second harmonic is the fifth harmonic, the third harmonic may be the third harmonic; if the first harmonic is the third harmonic and the second harmonic is the second harmonic, the third harmonic may be the fifth harmonic; if the first harmonic is the third harmonic and the second harmonic is the fifth harmonic, the third harmonic may be the second harmonic; if the first harmonic is the fifth harmonic and the second harmonic is the second harmonic, the third harmonic may be the third harmonic; if the first harmonic is the fifth harmonic and the second harmonic is the third harmonic, the third harmonic may be the second harmonic.

[0082] In an exemplary embodiment, the following method can be used but is not limited to: the target duty cycle is 20%, and the target phase is π / 3; or, the target duty cycle is 1 / 3, and the target phase is π / 5; or, the target duty cycle is 50%, and the target phase is π / 3; or, the target duty cycle is 50%, and the target phase is π / 5.

[0083] Optionally, in this embodiment, when the duty cycle of the first local oscillator signal and the second local oscillator signal is 20%, the phase of the first local oscillator signal and the phase of the second local oscillator signal may differ by π / 3; when the duty cycle of the first local oscillator signal and the second local oscillator signal is 1 / 3, the phase of the first local oscillator signal and the phase of the second local oscillator signal may differ by π / 5; when the duty cycle of the first local oscillator signal and the second local oscillator signal is 50%, the phase of the first local oscillator signal and the phase of the second local oscillator signal may differ by π / 3; when the duty cycle of the first local oscillator signal and the second local oscillator signal is 50%, the phase of the first local oscillator signal and the phase of the second local oscillator signal may differ by π / 5.

[0084] In an exemplary embodiment, the initial signal and the first local oscillator signal may be mixed to obtain a first mixed signal, and the initial signal and the second local oscillator signal may be mixed to obtain a second mixed signal in the following manner, but not limited to: the initial signal and the first local oscillator signal are input into a first mixer to obtain the first mixed signal output by the first mixer, and the initial signal and the second local oscillator signal are input into a second mixer to obtain the second mixed signal output by the second mixer, wherein a phase of the second local oscillator signal lags behind a phase of the first local oscillator signal by π / 3, or a phase of the second local oscillator signal lags behind a phase of the first local oscillator signal by π / 5.

[0085] Optionally, in this embodiment, the first mixer and the second mixer may be, but are not limited to, common double-balanced passive mixers.

[0086] In an optional embodiment, a schematic diagram of harmonic distribution after superposition of a first local oscillator signal and a second local oscillator signal is provided. Figure 3 is a schematic diagram of harmonic distribution after superposition of a first local oscillator signal and a second local oscillator signal according to an optional implementation manner of the present invention, such as Figure 3 As shown, the first local oscillator signal LO and the second local oscillator signal LO_60 have a duty cycle of 20% (target duty cycle), and the LO_60 square wave lags behind the LO phase by л / 3 (phase difference target phase). The figure shows the harmonic distribution of the first local oscillator signal and the second local oscillator signal after being superimposed by the mixer. The three points ABC in the figure are the fundamental wave, the third harmonic and the fifth harmonic of the first local oscillator signal and the second local oscillator signal, respectively, and point D is the second harmonic of the first local oscillator signal and the second local oscillator signal. Point A in the figure is the fundamental amplitude of the local oscillator signal, which has the largest amplitude. The amplitude values ​​of the third harmonic and the fifth harmonic of the local oscillator signal represented by points B and C are approximately zero, which significantly suppresses the third and fifth harmonics of the first local oscillator signal and the second local oscillator signal. Point D in the figure is the second harmonic of the first local oscillator signal and the second local oscillator signal. It can be seen from the figure that the second harmonic has not been eliminated, and the second harmonic can be eliminated after the next stage of the double resonance filter.

[0087] In the technical solution provided in the above step S204, the filter may be, but is not limited to, a double resonance filter.

[0088] Optionally, in this embodiment, the filter application scenario can be but is not limited to a zero intermediate frequency transmitter link, the main purpose of which is to eliminate the second harmonic of the local oscillator signal and to transmit the desired signal to the maximum extent, thereby minimizing the IRR signal output by the last-stage power amplifier of the link. In this application scenario, the use of a dual-resonance filter to suppress the second harmonic to achieve this purpose is within the protection scope of the present invention.

[0089] In an exemplary embodiment, the first output signal can be resonantly filtered using target filtering parameters in the following manner but is not limited to: the first output signal is input into a filter to obtain the second output signal output by the filter, wherein the filter includes a first filtering path and a second filtering path, the first filtering path is used to transmit the third harmonic in the first output signal to a ground terminal, the second filtering path is used to transmit other signals in the first output signal except the third harmonic to the output terminal of the filter, the resonant frequency of the first filtering path is the frequency of the third harmonic of the first local oscillator signal, the resonant frequency of the second filtering path is the fundamental frequency of the first local oscillator signal, and the target filtering parameters include the resonant frequency of the first filtering path and the resonant frequency of the second filtering path.

[0090] In an optional implementation, taking the third harmonic as the second harmonic as an example, a simulation diagram of a local oscillator signal after passing through a filter is provided. Figure 4 is a simulation schematic diagram of a local oscillator signal after passing through a filter according to an optional implementation manner of the present invention, such as Figure 4 As shown, the square wave signal is 7 GHz, point A is the resonance at the fundamental frequency of the first local oscillator signal and the second local oscillator signal, and the impedance is infinite; point B is the resonance at the second harmonic of the first local oscillator signal and the second local oscillator signal, and the impedance is approximately equal to 0.

[0091] In an exemplary embodiment, the first output signal may be input into a filter in the following manner, but is not limited to, to obtain the second output signal output by the filter: the first output signal is input into an input end of the filter, wherein the input end of the filter is connected to the output end of the filter via a transmission path, the first filtering path comprises a first inductor and a capacitor, the first inductor and the capacitor are sequentially connected in series between the transmission path and the ground end, the second filtering path comprises a second inductor, the second inductor is connected between the transmission path and the ground end, and the second inductance of the second inductor is n times the first inductance of the first inductor, wherein n=m2 -1, m is the harmonic order of the third harmonic; and the signal output from the output end of the filter is determined as the second output signal.

[0092] Optionally, in this embodiment, the second inductance of the second inductor is n times the first inductance of the first inductor, and m is the harmonic order of the third harmonic. The relationship between n and m can be expressed by Formula 1:

[0093] n=m 2 -1 (Formula 1)

[0094] That is, if the third harmonic is the fifth harmonic, then m = 5, n = 24; if the third harmonic is the third harmonic, then m = 3, n = 8; if the third harmonic is the second harmonic, then m = 2, n = 3. Considering the difficulty of the implementation, in this embodiment, n = 3 is taken, that is, a filter is used to suppress the second harmonic.

[0095] In an exemplary embodiment, the first output signal can be input into a filter to obtain the second output signal output by the filter in the following manner, but is not limited to: input the first mixing signal and the second mixing signal into a first subcircuit included in the filter to obtain a first filtered signal, and input the first mixing signal and the second mixing signal into a second subcircuit included in the filter to obtain a second filtered signal, wherein the first mixing signal is obtained by mixing the initial signal with the first local oscillator signal, the second mixing signal is obtained by mixing the initial signal with the second local oscillator signal, the first subcircuit includes a first subpath and a second subpath, the second subcircuit includes a third subpath and a fourth subpath, the first filtering path includes the first subpath and the third subpath, and the second filtering path includes the second subpath and the fourth subpath.

[0096] Optionally, in this embodiment, the first subcircuit may be, but is not limited to being, dual to the second subcircuit.

[0097] Optionally, in this embodiment, the first sub-path and the third sub-path may include, but are not limited to, a first inductor and a capacitor connected in series between the transmission path and the ground terminal, and the second sub-path and the fourth sub-path may include, but are not limited to, a second inductor connected between the transmission path and the ground terminal. The first sub-path and the third sub-path may be, but are not limited to, used to introduce the second harmonic signal with zero impedance in the first mixing signal and the second mixing signal into the ground terminal so that it will not be transmitted to the next stage; the second sub-path and the fourth sub-path may be, but are not limited to, used to transmit the fundamental wave of the local oscillator signal with infinite impedance.

[0098] In an exemplary embodiment, after resonant filtering the first output signal using the target filtering parameters to obtain the second output signal, the following method can be used but is not limited to: input the first filtered signal to the positive input terminal of the power amplifier, and input the second filtered signal to the negative input terminal of the power amplifier to obtain the target RF signal at the output terminal of the power amplifier.

[0099] Optionally, in this embodiment, the power amplifier may be, but is not limited to, an amplifier suitable for radio frequency signals, such as a broadband amplifier, a logarithmic amplifier, a gain module amplifier, a low noise amplifier, a variable gain amplifier, and the like.

[0100] Optionally, in this embodiment, since the first harmonic, the second harmonic and the third harmonic in the first filtered signal and the second filtered signal are suppressed, the interference signals with the first harmonic, the second harmonic and the third harmonic as the main components around the target RF signal output by the power amplifier are suppressed: the CIM3 signal and the I RR signal.

[0101] In this embodiment, a device for generating a radio frequency signal is also provided. Figure 5 is a schematic diagram of a radio frequency signal generating device according to an embodiment of the present invention, such as Figure 5 As shown, the device includes: a mixer 52 and a filter 54, wherein,

[0102] The output end of the mixer 52 is connected to the input end of the filter 54;

[0103] The mixer 52 is used to input an initial signal, a first local oscillator signal and a second local oscillator signal, wherein the duty cycle of the first local oscillator signal and the duty cycle of the second local oscillator signal are both target duty cycles, the phase of the first local oscillator signal differs from the phase of the second local oscillator signal by a target phase, the first local oscillator signal and the second local oscillator signal have the same signal properties except for the phase, and the target duty cycle and the target phase are set to suppress the first harmonic and the second harmonic generated during signal transmission; the initial signal is mixed with the first local oscillator signal and the second local oscillator signal respectively to obtain a first output signal; and the first output signal is output;

[0104] The filter 54 is used to input the first output signal; perform resonant filtering on the first output signal using target filtering parameters to obtain a second output signal, wherein the target filtering parameters are set to suppress the third harmonic generated during signal transmission; and output the second output signal, wherein the first harmonic, the second harmonic and the third harmonic are harmonic components that generate third-order intermodulation signals and image signals.

[0105] Optionally, in this embodiment, the mixer may be, but is not limited to, a traditional structure passive mixer.

[0106] In an optional embodiment, a device for generating a radio frequency signal is provided. Figure 6 is a schematic diagram of a radio frequency signal generating device according to an optional implementation mode of the present application, such as Figure 6 As shown, the device may include, but is not limited to, two mixers, two square wave signals, and a dual resonant filter. The input signal may include an intermediate frequency signal IF (i.e., the initial signal mentioned above) and two square wave signals (as the first local oscillator signal and the second local oscillator signal mentioned above). The two square wave signals LO (i.e., the first local oscillator signal mentioned above) and LO_60 (i.e., the second local oscillator signal mentioned above) have a duty cycle of 20% (target duty cycle), and the LO_60 square wave lags behind the LO phase by л / 3 (difference in target phase). The single-sided circuit of the dual resonant filter is an inductor L 2LO and capacitor C 2LO In series, the resonance is at the frequency of the third harmonic of the first local oscillator signal (for example, in this optional implementation, it can resonate at the second harmonic frequency to suppress the second harmonic), and the parallel inductance is L LO , resonating at the fundamental frequency of the first local oscillator signal.

[0107] In an exemplary embodiment, the mixer comprises: a first mixer (such as Figure 6 mixer1 shown in FIG. 1 ) and a second mixer (as shown in FIG. Figure 6 The output end of the first mixer and the output end of the second mixer are both connected to the input end of the filter, and the initial signal (such as Figure 6 The first local oscillator signal (as shown in FIG. 1 ) is input into the other input end of the first mixer. Figure 6 LO shown in ), one input end of the second mixer inputs the initial signal, and the other input end of the second mixer inputs the second local oscillator signal (as shown in Figure 6 LO_60 shown in ); the first mixer is used to mix the initial signal with the first local oscillator signal to obtain a first mixed signal; the second mixer is used to mix the initial signal with the second local oscillator signal to obtain a second mixed signal; wherein the first output signal includes the first mixed signal and the second mixed signal, the first harmonic and the second harmonic are two harmonics in a harmonic set that generates a third-order intermodulation signal and an image signal, the third harmonic is a harmonic in the harmonic set except the two harmonics, and the harmonic set includes a second harmonic, a third harmonic and a fifth harmonic.

[0108] Optionally, in this embodiment, the initial signal can be input through one input end of the first mixer, and the first local oscillator signal can be input through another input end of the first mixer, so that the initial signal is mixed with the first local oscillator signal to obtain a first mixed signal with the first harmonic suppressed, and the initial signal is input through one input end of the second mixer, and the second local oscillator signal is input through another input end of the second mixer, so that the initial signal is mixed with the second local oscillator signal to obtain a second mixed signal with the second harmonic suppressed; or, the initial signal can be input through one input end of the first mixer, and the first local oscillator signal can be input through another input end of the first mixer, so that the initial signal is mixed with the first local oscillator signal to obtain the first mixed signal with the second harmonic suppressed, and the initial signal is input through one input end of the second mixer, and the second local oscillator signal is input through another input end of the second mixer, so that the initial signal is mixed with the second local oscillator signal to obtain the second mixed signal with the first harmonic suppressed.

[0109] In an exemplary embodiment, the target duty cycle is 20%, the target phase is π / 3, and the phase of the second local oscillator signal lags behind the phase of the first local oscillator signal; or, the target duty cycle is 1 / 3, the target phase is π / 5, and the phase of the second local oscillator signal lags behind the phase of the first local oscillator signal; the target duty cycle is 50%, the target phase is π / 3, and the phase of the second local oscillator signal lags behind the phase of the first local oscillator signal; or, the target duty cycle is 50%, the target phase is π / 5, and the phase of the second local oscillator signal lags behind the phase of the first local oscillator signal.

[0110] Optionally, in this embodiment, the duty cycle of the first local oscillator signal and the second local oscillator signal can be set to 20%, and the phase of the second local oscillator signal lags behind the phase of the first local oscillator signal by π / 3, thereby suppressing the third harmonic and the fifth harmonic, and the second harmonic is suppressed by the filter; or, the duty cycle of the first local oscillator signal and the second local oscillator signal can be set to 1 / 3, and the phase of the second local oscillator signal lags behind the phase of the first local oscillator signal by π / 5, thereby suppressing the third harmonic and the fifth harmonic, and the second harmonic is suppressed by the filter; the duty cycle of the first local oscillator signal and the second local oscillator signal can be set to 50%, and the phase of the second local oscillator signal lags behind the phase of the first local oscillator signal by π / 3, thereby suppressing the second harmonic and the third harmonic, and the fifth harmonic is suppressed by the filter; or, the duty cycle of the first local oscillator signal and the second local oscillator signal can be set to 50%, and the phase of the second local oscillator signal lags behind the phase of the first local oscillator signal by π / 5, thereby suppressing the second harmonic and the fifth harmonic, and the third harmonic is suppressed by the filter.

[0111] In an optional embodiment, a signal diagram of a first local oscillator signal and a second local oscillator signal is provided. Figure 7 is a signal schematic diagram of a first local oscillator signal and a second local oscillator signal according to an optional implementation manner of the present invention, such as Figure 7 As shown, the first local oscillator signal is a square wave signal L0, the second local oscillator signal is another square wave signal L060 with a phase delay gate / 3, the duty cycle of the first local oscillator signal and the second local oscillator signal are both 20%, and the square wave signal amplitude is 1. TLO is the period of the square wave signal.

[0112] Optionally, in this embodiment, assuming that the duty cycle of the square wave signal is D, the phase delay of the other square wave signal is α, the harmonic of the local oscillator signal is n, and j represents an imaginary number, the Fourier transform of the superposition of the two square wave signals can be expressed by Formula 2:

[0113]

[0114] There is an imaginary coefficient in the formula. It can be seen that in order to obtain the harmonic suppression signal, the imaginary coefficient needs to be eliminated, which can be expressed by formula 3:

[0115] j·sinnα=0

[0116] j·sinnπD=O (Formula 3)

[0117] Optionally, in this embodiment, there are two ways to eliminate the imaginary coefficients, thereby obtaining a harmonic suppression signal. Mode 1: When the harmonic number n is 3, the duty cycle D is 1 / 3, and the third harmonic is 0; when the harmonic number n is 5, the phase delay is π / 5, and the fifth harmonic is 0. That is, when the target duty cycle is 1 / 3, the third harmonic can be suppressed, when the target phase is π / 5, the fifth harmonic can be suppressed, and when the target duty cycle is 1 / 3 and the target phase is π / 5, the third harmonic and the fifth harmonic can be suppressed at the same time. Mode 2: When the harmonic number n is 5, the duty cycle D is 20%, and the fifth harmonic is 0; when the harmonic number n is 3, the phase delay is л / 3, and the third harmonic is 0. That is, when the target duty cycle is 20%, the fifth harmonic can be suppressed, when the target phase is π / 3, the third harmonic can be suppressed, and when the target duty cycle is 20% and the target phase is π / 3, the fifth harmonic and the third harmonic can be suppressed at the same time.

[0118] In an exemplary embodiment, the filter includes: a transmission path (such as Figure 6 The output paths of RF_p and RF_n shown in FIG), the first filtering path (such as Figure 6 L shown in 2LO and C 2LO The series path) and the second filtering path (such as Figure 6 L shown in LO ), wherein the input end of the filter is connected to the output end of the filter through the transmission path, and the first filtering path includes a first inductor device (such as Figure 6 L shown in 2LO ) and capacitor devices (such as Figure 6 C shown in 2LO ), the first inductor and the capacitor are connected in series between the transmission path and the ground terminal in sequence, and the second filtering path includes a second inductor (such as Figure 6 L shown in LO ), the second inductor is connected between the transmission path and the ground terminal, the first filter path resonates at the frequency of the third harmonic, and the second filter path resonates at the fundamental frequency of the first local oscillator signal.

[0119] Optionally, in this embodiment, the second inductance of the second inductor is n times the first inductance of the first inductor, where n=m 2 -1, m is the harmonic order of the third harmonic.

[0120] Optionally, in this embodiment, if the third harmonic is the fifth harmonic, then m=5, n=24, that is, L 2LO =24L LO ; If the third harmonic is the third harmonic, then m = 3, n = 8, that is, L 2LO =8L LO ; If the third harmonic is the second harmonic, then m = 2, n = 3, that is, L 2LO =3L LO Considering the difficulty of implementation, n=3 is taken in this embodiment, that is, a filter is used to suppress the second harmonic.

[0121] Optionally, in this embodiment, the filter may be, but is not limited to, a double resonance filter.

[0122] Optionally, in this embodiment, the filter application scenario can be but is not limited to a zero intermediate frequency transmitter link, the main purpose of which is to eliminate the second harmonic of the local oscillator signal and to transmit the desired signal to the maximum extent, thereby minimizing the IRR signal output by the last-stage power amplifier of the link. In this application scenario, the use of a dual-resonance filter to suppress the second harmonic to achieve this purpose is within the protection scope of the present invention.

[0123] In an exemplary embodiment, the filter comprises: a first subcircuit (such as Figure 6 The circuit on the RF_p side shown in FIG) and the second sub-circuit (as shown in FIG). Figure 6 ), wherein the first sub-circuit includes a first sub-path (such as Figure 6 The L on the RF_p side shown in 2LO and C 2LO The concatenated path) and the second subpath (such as Figure 6 The L on the RF_p side shown inLO ), the second sub-circuit includes a third sub-path (such as Figure 6 L on the RF_n side shown in 2LO and C 2LO The concatenated path) and the fourth subpath (such as Figure 6 L on the RF_n side shown in LO , the first filtering path includes the first sub-path and the third sub-path, and the second filtering path includes the second sub-path and the fourth sub-path; the input end of the first sub-circuit is an input end of the filter, the input end of the second sub-circuit is another input end of the filter, the output end of the first sub-circuit is an output end of the filter, and the output end of the second sub-circuit is another output end of the filter; the first sub-circuit is used to input a first mixing signal and a second mixing signal, wherein the first mixing signal is obtained by mixing the initial signal with the first local oscillator signal, and the second mixing signal is obtained by mixing the initial signal with the second local oscillator signal; the combined signal of the first mixing signal and the second mixing signal is filtered to obtain a first filtered signal (such as Figure 6 RF_p signal shown in ); output the first filtered signal; the second sub-circuit is used to input the first mixing signal and the second mixing signal; filter the combined signal of the first mixing signal and the second mixing signal to obtain a second filtered signal (such as Figure 6 ); outputting the second filtered signal, wherein the second output signal includes the first filtered signal and the second filtered signal.

[0124] Optionally, in this embodiment, the first subcircuit may be, but is not limited to being, dual to the second subcircuit.

[0125] Optionally, in this embodiment, the first sub-path and the third sub-path may include, but are not limited to, a first inductor and a capacitor connected in series between the transmission path and the ground terminal, and the second sub-path and the fourth sub-path may include, but are not limited to, a second inductor connected between the transmission path and the ground terminal. The first sub-path and the third sub-path may be, but are not limited to, used to introduce the second harmonic signal with zero impedance in the first mixing signal and the second mixing signal into the ground terminal so that it will not be transmitted to the next stage; the second sub-path and the fourth sub-path may be, but are not limited to, used to transmit the fundamental wave of the local oscillator signal with infinite impedance.

[0126] In an exemplary embodiment, the device further comprises: a power amplifier, wherein the power amplifier comprises: a positive input terminal, a negative input terminal and a radio frequency output terminal; the positive input terminal is used to input the first filtered signal (such as Figure 6The negative input terminal is used to input the second filtered signal (such as Figure 6 The RF_n signal shown in ); the RF output terminal is used to output the target RF signal.

[0127] Optionally, in this embodiment, the power amplifier may be, but is not limited to, an amplifier suitable for radio frequency signals, such as a broadband amplifier, a logarithmic amplifier, a gain module amplifier, a low noise amplifier, a variable gain amplifier, and the like.

[0128] Optionally, in this embodiment, since the first harmonic, the second harmonic and the third harmonic in the first filtered signal and the second filtered signal are suppressed, the interference signals with the first harmonic, the second harmonic and the third harmonic as the main components around the target RF signal output by the power amplifier are suppressed: the CIM3 signal and the I RR signal.

[0129] In an optional implementation, taking the third harmonic as the second harmonic as an example, a schematic diagram of a filter circuit is provided. Figure 8 is a schematic diagram of a filter circuit according to an optional embodiment of the present invention, such as Figure 8 As shown, L 2LO (i.e. the first inductor) and C 2LO (i.e. capacitor) is the inductor and capacitor in series, and the parallel inductor is L LO (i.e., the second inductor). The first filtering path includes L 2LO and C 2LO , L 2LO and C 2LO are connected in series between the transmission path and the ground terminal, and the second filtering path includes L LO , L LO Connected between the transmission path and the ground terminal, the inductor L 2LO The inductance value is the inductance L LO Three times the inductance, i.e. L 2LO =3L LO (n=3).

[0130] Optionally, in this embodiment, assuming that the frequency of the incoming signal is ω, j represents an imaginary number, the impedance of the dual-resonance circuit structure can be expressed by Formula 4:

[0131]

[0132] The pole frequency of the impedance expression is the fundamental frequency of the local oscillator signal, which can be expressed by formula 5:

[0133]

[0134] The zero frequency of the impedance expression is the second harmonic frequency of the local oscillator signal, which can be expressed by formula 6:

[0135]

[0136] In this embodiment, the pole and zero frequencies are set to be the fundamental frequency and the second harmonic frequency of the local oscillator signal respectively, and there is a two-fold calculation relationship. The inductance L is calculated to be 2LO The inductance value is the inductance L LO Three times the inductance, i.e. L 2LO =3L LO , this multiple relationship must be satisfied. The resonance of the zero point and the pole is a double-resonance circuit. The impedance of the fundamental frequency of the local oscillator signal flowing into the double-resonance circuit structure is infinite, and it will flow to the next stage circuit and will not flow to the ground. The impedance of the second harmonic signal of the local oscillator signal flowing into the double-resonance circuit structure is zero, and it will flow to the ground and will not be transmitted to the next stage.

[0137] In an optional embodiment, a schematic diagram of a method for generating a radio frequency signal is provided. Fig. 9 is a schematic diagram of a method for generating a radio frequency signal according to an optional embodiment of the present invention, such as Fig. 9 As shown, the two square wave signals input to the up-conversion mixer are 20% square wave signals, and one of them is phase delayed by 1 / 3. The characteristics of the two square wave signals determine that the signals 3LO (third harmonic)-IF (input intermediate frequency signal) and 5LO (fifth harmonic) ±IF do not exist in output 1 (i.e., the first output signal). Output 1 flows into the dual-resonance filter, and the characteristics of the dual-resonance filter determine that output 2 (i.e., the second output signal) does not contain 2LO (second harmonic) signals. Output 2 does not contain 2LO, 3LO-IF and 5LO±IF signals and flows into the power amplifier. The LO-3IF (the CIM3) signal in output 3 (i.e., the target RF signal) is suppressed by eliminating 3 and 4, and the LO-IF (the IRR) signal in output 3 is suppressed by eliminating 1 and 2. It should be pointed out that the main innovation of the present invention is that the prior art can only eliminate combination 3, while the core of the present invention is that it can simultaneously eliminate combination 1, combination 2, combination 3 and combination 4, thereby suppressing the interference signal around the desired signal output by the power amplifier, which is the core innovation of the present invention.

[0138] Through the above-mentioned device, the initial signal is first mixed with the first local oscillator signal and the second local oscillator signal of the target duty cycle and the target phase that can suppress the first harmonic and the second harmonic, and the first harmonic and the second harmonic generated during the signal transmission are first filtered out, and then the first output signal that has filtered out the first harmonic and the second harmonic is resonantly filtered using the target filter parameters that are set to suppress the third harmonic, and the third harmonic of the first output signal is filtered out, so that the harmonic components of the third-order intermodulation signal and the mirror signal generated by the initial signal during the transmission process: the first harmonic, the second harmonic and the third harmonic are all suppressed, thereby suppressing the third-order intermodulation signal and the mirror signal of the radio frequency signal at the same time. Therefore, the problem of low efficiency in suppressing interference signals in the output signal is solved, and the effect of improving the efficiency of suppressing interference signals in the output signal is achieved.

[0139] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0140] In this embodiment, a device for generating a radio frequency signal is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware of a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0141] Fig.10 is a structural block diagram of a device for generating a radio frequency signal according to an embodiment of the present invention, such as Fig.10 As shown, the device comprises:

[0142] A mixing module 1002 is used to mix the initial signal with the first local oscillator signal and the second local oscillator signal respectively to obtain a first output signal, wherein the duty cycle of the first local oscillator signal and the duty cycle of the second local oscillator signal are both target duty cycles, the phase of the first local oscillator signal and the phase of the second local oscillator signal differ by a target phase, and the target duty cycle and the target phase are set to suppress the first harmonic and the second harmonic generated during signal transmission;

[0143] The filtering module 1004 is used to perform resonant filtering on the first output signal using target filtering parameters to obtain a second output signal, wherein the target filtering parameters are set to suppress the third harmonic generated during signal transmission, wherein the first harmonic, the second harmonic and the third harmonic are harmonic components that generate third-order intermodulation signals and image signals.

[0144] Through the above device, the initial signal is first mixed with the first local oscillator signal and the second local oscillator signal of the target duty cycle and the target phase that can suppress the first harmonic and the second harmonic, and the first harmonic and the second harmonic generated during the signal transmission are first filtered out, and then the first output signal that has filtered out the first harmonic and the second harmonic is resonantly filtered using the target filter parameters that are set to suppress the third harmonic, and the third harmonic of the first output signal is filtered out, so that the harmonic components of the third-order intermodulation signal and the mirror signal generated by the initial signal during the transmission process: the first harmonic, the second harmonic and the third harmonic are all suppressed, thereby suppressing the third-order intermodulation signal and the mirror signal of the radio frequency signal at the same time. Therefore, the problem of low efficiency in suppressing interference signals in the output signal is solved, and the effect of improving the efficiency of suppressing interference signals in the output signal is achieved.

[0145] In an exemplary embodiment, the frequency mixing module comprises:

[0146] A mixing unit, used for mixing the initial signal with the first local oscillator signal to obtain a first mixed signal, and mixing the initial signal with the second local oscillator signal to obtain a second mixed signal; wherein the first output signal includes the first mixed signal and the second mixed signal, the first harmonic and the second harmonic are two harmonics in a harmonic set, the third harmonic is a harmonic in the harmonic set except the two harmonics, and the harmonic set includes a second harmonic, a third harmonic and a fifth harmonic.

[0147] In an exemplary embodiment, the target duty cycle is 20%, and the target phase is π / 3; or,

[0148] The target duty cycle is 1 / 3, and the target phase is π / 5; or,

[0149] The target duty cycle is 50%, and the target phase is π / 3; or,

[0150] The target duty cycle is 50%, and the target phase is π / 5.

[0151] In an exemplary embodiment, the frequency mixing unit is used to:

[0152] The initial signal and the first local oscillator signal are input into a first mixer to obtain the first mixed signal output by the first mixer, and the initial signal and the second local oscillator signal are input into a second mixer to obtain the second mixed signal output by the second mixer, wherein a phase of the second local oscillator signal lags behind a phase of the first local oscillator signal by π / 3, or a phase of the second local oscillator signal lags behind a phase of the first local oscillator signal by π / 5.

[0153] In an exemplary embodiment, the filtering module includes:

[0154] An input unit is used to input the first output signal into a filter to obtain the second output signal output by the filter, wherein the filter includes a first filtering path and a second filtering path, the first filtering path is used to transmit the third harmonic in the first output signal to a ground terminal, and the second filtering path is used to transmit other signals in the first output signal except the third harmonic to an output terminal of the filter, the resonant frequency of the first filtering path is the frequency of the third harmonic of the first local oscillator signal, the resonant frequency of the second filtering path is the fundamental frequency of the first local oscillator signal, and the target filtering parameters include the resonant frequency of the first filtering path and the resonant frequency of the second filtering path.

[0155] In an exemplary embodiment, the input unit is used to:

[0156] Input the first output signal to the input end of the filter, wherein the input end of the filter is connected to the output end of the filter via a transmission path, the first filtering path comprises a first inductor and a capacitor, the first inductor and the capacitor are sequentially connected in series between the transmission path and the ground end, the second filtering path comprises a second inductor, the second inductor is connected between the transmission path and the ground end, the second inductor has a second inductance value that is n times the first inductance value of the first inductor, wherein the n times is used to match the proportional relationship between the frequency of the third harmonic and the fundamental frequency;

[0157] The signal outputted from the output terminal of the filter is determined as the second output signal.

[0158] In an exemplary embodiment, the input unit is further used for:

[0159] The first mixing signal and the second mixing signal are input into the first subcircuit included in the filter to obtain the first filtered signal, and the first mixing signal and the second mixing signal are input into the second subcircuit included in the filter to obtain the second filtered signal, wherein the first mixing signal is obtained by mixing the initial signal with the first local oscillator signal, and the second mixing signal is obtained by mixing the initial signal with the second local oscillator signal, the first subcircuit includes a first subpath and a second subpath, the second subcircuit includes a third subpath and a fourth subpath, the first filtering path includes the first subpath and the third subpath, and the second filtering path includes the second subpath and the fourth subpath.

[0160] In an exemplary embodiment, the apparatus further comprises:

[0161] An input module is used to input the first filtered signal into the positive input terminal of the power amplifier and input the second filtered signal into the negative input terminal of the power amplifier after resonant filtering the first output signal using the target filtering parameters to obtain the second output signal, so as to obtain the target RF signal at the output terminal of the power amplifier.

[0162] It should be noted that the above modules can be implemented by software or hardware. For the latter, it can be implemented in the following ways, but not limited to: the above modules are all located in the same processor; or the above modules are located in different processors in any combination.

[0163] An embodiment of the present invention further provides a computer-readable storage medium, in which a computer program is stored, wherein the computer program is configured to execute the steps of any of the above method embodiments when running.

[0164] In an exemplary embodiment, the computer-readable storage medium may include, but is not limited to, various media that can store computer programs, such as a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk.

[0165] An embodiment of the present invention further provides an electronic device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0166] In an exemplary embodiment, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor, and the input / output device is connected to the processor.

[0167] For specific examples in this embodiment, reference may be made to the examples described in the above embodiments and exemplary implementation modes, and this embodiment will not be described in detail herein.

[0168] An embodiment of the present invention further provides a radio frequency transmitter, which includes the radio frequency signal generating device and a signal transmitter in any one of the above items, wherein the signal transmitter is used to transmit the signal generated by the radio frequency signal generating device.

[0169] In an exemplary embodiment, the signal transmitter may include any device having a radio frequency signal transmitting function, such as a transmitting antenna and the like.

[0170] For specific examples in this embodiment, reference may be made to the examples described in the above embodiments and exemplary implementation modes, and this embodiment will not be described in detail herein.

[0171] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0172] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for generating a radio frequency signal, characterized in that: include: Mixing the initial signal with the first local oscillator signal and the second local oscillator signal respectively to obtain a first output signal, wherein the duty cycle of the first local oscillator signal and the duty cycle of the second local oscillator signal are both target duty cycles, the phase of the first local oscillator signal differs from the phase of the second local oscillator signal by a target phase, the first local oscillator signal and the second local oscillator signal have the same signal properties except for the phase, and the target duty cycle and the target phase are set to suppress the first harmonic and the second harmonic generated during signal transmission; The first output signal is resonantly filtered using target filtering parameters to obtain a second output signal, wherein the target filtering parameters are set to suppress the third harmonic generated during signal transmission, wherein the first harmonic, the second harmonic and the third harmonic are harmonic components that generate third-order intermodulation signals and image signals.

2. The method according to claim 1, characterized in that The mixing of the initial signal with the first local oscillator signal and the second local oscillator signal to obtain a first output signal includes: Mixing the initial signal with the first local oscillator signal to obtain a first mixed signal, and mixing the initial signal with the second local oscillator signal to obtain a second mixed signal; The first output signal includes the first mixing signal and the second mixing signal, the first harmonic and the second harmonic are two harmonics in a harmonic set that generates a third-order intermodulation signal and an image signal, the third harmonic is a harmonic in the harmonic set other than the two harmonics, and the harmonic set includes a second harmonic, a third harmonic and a fifth harmonic.

3. The method according to claim 2, characterized in that The target duty cycle is 20%, and the target phase is π / 3; or, The target duty cycle is 1 / 3, and the target phase is π / 5; or, The target duty cycle is 50%, and the target phase is π / 3; or, The target duty cycle is 50%, and the target phase is π / 5.

4. The method according to claim 3, characterized in that The mixing the initial signal with the first local oscillator signal to obtain a first mixed signal, and mixing the initial signal with the second local oscillator signal to obtain a second mixed signal, comprises: The initial signal and the first local oscillator signal are input into a first mixer to obtain the first mixed signal output by the first mixer, and the initial signal and the second local oscillator signal are input into a second mixer to obtain the second mixed signal output by the second mixer, wherein a phase of the second local oscillator signal lags behind a phase of the first local oscillator signal by π / 3, or a phase of the second local oscillator signal lags behind a phase of the first local oscillator signal by π / 5.

5. The method according to claim 1, characterized in that The step of performing resonant filtering on the first output signal using the target filtering parameter to obtain a second output signal includes: The first output signal is input into a filter to obtain the second output signal output by the filter, wherein the filter includes a first filtering path and a second filtering path, the first filtering path is used to transmit the third harmonic in the first output signal to a ground terminal, and the second filtering path is used to transmit other signals in the first output signal except the third harmonic to an output terminal of the filter, the resonant frequency of the first filtering path is the frequency of the third harmonic of the first local oscillator signal, the resonant frequency of the second filtering path is the fundamental frequency of the first local oscillator signal, and the target filtering parameters include the resonant frequency of the first filtering path and the resonant frequency of the second filtering path.

6. The method according to claim 5, characterized in that The step of inputting the first output signal into a filter to obtain the second output signal output by the filter comprises: The first output signal is input to the input end of the filter, wherein the input end of the filter is connected to the output end of the filter via a transmission path, the first filtering path comprises a first inductor and a capacitor, the first inductor and the capacitor are sequentially connected in series between the transmission path and the ground end, the second filtering path comprises a second inductor, the second inductor is connected between the transmission path and the ground end, and the second inductance of the second inductor is n times the first inductance of the first inductor, wherein n=m 2 -1, m is the harmonic order of the third harmonic; The signal outputted from the output terminal of the filter is determined as the second output signal.

7. The method according to claim 5, characterized in that The step of inputting the first output signal into a filter to obtain the second output signal output by the filter comprises: The first mixing signal and the second mixing signal are input into the first subcircuit included in the filter to obtain the first filtered signal, and the first mixing signal and the second mixing signal are input into the second subcircuit included in the filter to obtain the second filtered signal, wherein the first mixing signal is obtained by mixing the initial signal with the first local oscillator signal, and the second mixing signal is obtained by mixing the initial signal with the second local oscillator signal, the first subcircuit includes a first subpath and a second subpath, the second subcircuit includes a third subpath and a fourth subpath, the first filtering path includes the first subpath and the third subpath, and the second filtering path includes the second subpath and the fourth subpath.

8. The method according to claim 7, characterized in that After performing resonance filtering on the first output signal using the target filtering parameter to obtain a second output signal, the method further includes: The first filtered signal is input into a positive input terminal of a power amplifier, and the second filtered signal is input into a negative input terminal of the power amplifier to obtain a target radio frequency signal at an output terminal of the power amplifier.

9. A device for generating a radio frequency signal, characterized in that: include: mixers and filters, where The output end of the mixer is connected to the input end of the filter; The mixer is used to input an initial signal, a first local oscillator signal and a second local oscillator signal, wherein the duty cycle of the first local oscillator signal and the duty cycle of the second local oscillator signal are both target duty cycles, the phase of the first local oscillator signal differs from the phase of the second local oscillator signal by a target phase, the first local oscillator signal and the second local oscillator signal have the same signal properties except for the phase, and the target duty cycle and the target phase are set to suppress the first harmonic and the second harmonic generated during signal transmission; the initial signal is mixed with the first local oscillator signal and the second local oscillator signal respectively to obtain a first output signal; and the first output signal is output; The filter is used to input the first output signal; perform resonant filtering on the first output signal using target filtering parameters to obtain a second output signal, wherein the target filtering parameters are set to suppress the third harmonic generated during signal transmission; and output the second output signal, wherein the first harmonic, the second harmonic and the third harmonic are harmonic components that generate third-order intermodulation signals and image signals.

10. The device according to claim 9, characterized in that The mixer comprises: a first mixer and a second mixer, wherein: The output end of the first mixer and the output end of the second mixer are both connected to the input end of the filter, the initial signal is input to one input end of the first mixer, the first local oscillator signal is input to the other input end of the first mixer, the initial signal is input to one input end of the second mixer, and the second local oscillator signal is input to the other input end of the second mixer; The first mixer is used to mix the initial signal with the first local oscillator signal to obtain a first mixed signal; The second mixer is used to mix the initial signal with the second local oscillator signal to obtain a second mixed signal; The first output signal includes the first mixing signal and the second mixing signal, the first harmonic and the second harmonic are two harmonics in a harmonic set that generates a third-order intermodulation signal and an image signal, the third harmonic is a harmonic in the harmonic set other than the two harmonics, and the harmonic set includes a second harmonic, a third harmonic and a fifth harmonic.

11. The device according to claim 10, characterized in that The target duty cycle is 20%, the target phase is π / 3, and the phase of the second local oscillator signal lags behind the phase of the first local oscillator signal; or, The target duty cycle is 1 / 3, the target phase is π / 5, and the phase of the second local oscillator signal lags behind the phase of the first local oscillator signal; The target duty cycle is 50%, the target phase is π / 3, and the phase of the second local oscillator signal lags behind the phase of the first local oscillator signal; or, The target duty cycle is 50%, the target phase is π / 5, and the phase of the second local oscillation signal lags behind the phase of the first local oscillation signal.

12. The device according to claim 9, characterized in that The filter comprises: a transmission path, a first filtering path and a second filtering path, wherein: The input end of the filter is connected to the output end of the filter through the transmission path, the first filter path includes a first inductor and a capacitor, the first inductor and the capacitor are connected in series between the transmission path and the ground end in sequence, the second filter path includes a second inductor, the second inductor is connected between the transmission path and the ground end, the first filter path resonates at the frequency of the third harmonic, and the second filter path resonates at the fundamental frequency of the first local oscillator signal.

13. The device according to claim 12, characterized in that The second inductance of the second inductor is n times the first inductance of the first inductor, where n=m 2 -1, m is the harmonic order of the third harmonic.

14. The device according to claim 12, characterized in that The filter comprises: a first subcircuit and a second subcircuit, wherein the first subcircuit comprises a first subpath and a second subpath, the second subcircuit comprises a third subpath and a fourth subpath, the first filtering path comprises the first subpath and the third subpath, and the second filtering path comprises the second subpath and the fourth subpath; The input end of the first subcircuit is one input end of the filter, the input end of the second subcircuit is another input end of the filter, the output end of the first subcircuit is one output end of the filter, and the output end of the second subcircuit is another output end of the filter; The first sub-circuit is configured to input a first mixing signal and a second mixing signal, wherein the first mixing signal is obtained by mixing the initial signal with the first local oscillator signal, and the second mixing signal is obtained by mixing the initial signal with the second local oscillator signal; filter a combined signal of the first mixing signal and the second mixing signal to obtain a first filtered signal; and output the first filtered signal; The second sub-circuit is used to input the first mixing signal and the second mixing signal; filter the combined signal of the first mixing signal and the second mixing signal to obtain a second filtered signal; and output the second filtered signal, wherein the second output signal includes the first filtered signal and the second filtered signal.

15. The device according to claim 14, characterized in that The device further comprises: a power amplifier, wherein: The power amplifier comprises: a positive input terminal, a negative input terminal and a radio frequency output terminal; The positive input terminal is used to input the first filtered signal; The negative input terminal is used to input the second filtered signal; The radio frequency output terminal is used to output a target radio frequency signal.

16. A radio frequency transmitter, characterized in that: The radio frequency transmitter comprises the radio frequency signal generating device and a signal transmitter as described in any one of claims 9 to 15, wherein the signal transmitter is used to transmit the signal generated by the radio frequency signal generating device.

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