Method, device and radio frequency transmitter for generating radio frequency signals

Abstract

The embodiment of the present application provides a kind of generation method, equipment and radio frequency transmitter of radio frequency signal, wherein the method comprises: the initial signal is mixed with first local oscillator signal and second local oscillator signal respectively, to obtain first output signal;The first output signal is resonant filtered using target filter parameter, to obtain second output signal, wherein the target filter parameter is set to be used to suppress third harmonic generated in signal transmission process, wherein the first harmonic, the second harmonic and the third harmonic are harmonic components for generating third-order intermodulation signal and image signal.By the present application, the problem that the efficiency of suppressing interference signals in the output signal is low is solved, and the effect of improving the efficiency of suppressing interference signals in the output signal is achieved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of communications, and more specifically, to a method, apparatus and radio frequency transmitter for generating radio frequency signals. Background Technology

[0002] With the development of modern wireless communication, signal bandwidth has increased significantly. In commonly used zero-IF transceivers, the frequency of the local oscillator signal fed into the mixer is also constantly increasing. In the zero-IF transmitter link, the local oscillator signal input to the upconversion mixer is a square wave signal. The second harmonic of this non-50% duty cycle square wave signal, along with the desired up-mixed signal (i.e., the RF signal), flows into the power amplifier. Due to the nonlinearity of the power amplifier, a mirror signal, i.e., an IRR signal, is generated. The third and fifth harmonics of the square wave signal, after up-mixing, also flow into the power amplifier along with the desired signal. Due to the nonlinearity of the power amplifier, a third-order intermodulation signal, i.e., a CIM3 (Counter Intermodulation) signal, is generated. The mirror signal and the intermodulation signal interfere with the left side of the RF signal (RF-2IF and RF-4IF), respectively, affecting the transmission of the RF signal.

[0003] In existing technologies, methods for suppressing interference signals can generally only suppress a single interference signal, but other interference signals may still appear in the output signal.

[0004] There is still no effective solution to the problem of low efficiency in suppressing interference signals in the output signal in related technologies. Summary of the Invention

[0005] This invention provides a method, apparatus, and radio frequency transmitter for generating radio frequency signals, to at least solve the problem of low efficiency in suppressing interference signals in the output signal in related technologies.

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

[0007] The initial signal is mixed with the first local oscillator signal and the second local oscillator signal respectively to obtain the first output signal. 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 from the target phase. The first local oscillator signal and the second local oscillator signal have the same signal properties except for the phase. 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 the target filtering parameters to obtain the second output signal. The target filtering parameters are set to suppress the third harmonic generated during signal transmission. The first harmonic, the second harmonic, and the third harmonic are harmonic components that generate the third-order intermodulation signal and the image signal.

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

[0010] 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;

[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 the harmonic set that generate the third-order intermodulation signal and the mirror signal. The third harmonic is a harmonic other than the two harmonics in the harmonic set. The harmonic set includes the second harmonic, the third harmonic and the fifth harmonic.

[0012] In one exemplary embodiment, the method further includes:

[0013] The target has a duty cycle of 20% and a phase of π / 3; or...

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

[0015] The target has a duty cycle of 50% and a phase of π / 3; or...

[0016] The target has a duty cycle of 50% and a phase of 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 the phase of the second local oscillator signal lags behind the phase of the first local oscillator signal by π / 3, or the phase of the second local oscillator signal lags behind the 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 target filtering parameters 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. 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 the ground terminal. The second filtering path is used to transmit other signals in the first output signal besides 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. The target filtering parameters include the resonant frequency of the first filtering path and the resonant frequency of the second filtering path.

[0021] In one exemplary embodiment, the step of 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 terminal of the filter. The input terminal and output terminal of the filter are connected via a transmission path. The first filtering path includes a first inductor and a capacitor, which are connected in series between the transmission path and the ground terminal. The second filtering path includes a second inductor connected between the transmission path and the ground terminal. The second inductance value of the second inductor is n times the first inductance value of the first inductor, where n = m. 2 -1, where m is the harmonic order of the third harmonic;

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

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

[0025] A first mixed signal and a second mixed signal are input into a first sub-circuit of the filter to obtain a first filtered signal, and the first mixed signal and the second mixed signal are input into a second sub-circuit of the filter to obtain a second filtered signal. The first mixed signal is obtained by mixing the initial signal with the first local oscillator signal, and the second mixed signal is obtained by mixing the initial signal with the second local oscillator signal. The first sub-circuit includes a first sub-path and a second sub-path, the second sub-circuit includes a third sub-path and a fourth sub-path, 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.

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

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

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

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

[0030] The mixer is used to input an initial signal, a first local oscillator signal, and a second local oscillator signal. The duty cycles of both the first and second local oscillator signals are target duty cycles. The phases of the first and second local oscillator signals differ by a target phase. The first and second local oscillator signals have the same signal properties except for phase. The target duty cycle and target phase are set to suppress the first and second harmonics generated during signal transmission. The initial signal is mixed with both the first and second local oscillator signals to obtain a first output signal. The first output signal is then output.

[0031] The filter is used to input the first output signal; 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; and to output the second output signal, wherein the first harmonic, the second harmonic, and the third harmonic are harmonic components that generate the third-order intermodulation signal and the image signal.

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

[0033] The output terminals of the first mixer and the second mixer are both connected to the input terminal of the filter. The initial signal is input to one input terminal of the first mixer, and the first local oscillator signal is input to the other input terminal of the first mixer. The initial signal is input to one input terminal of the second mixer, and the second local oscillator signal is input to the other input terminal 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 the harmonic set that generate the third-order intermodulation signal and the mirror signal. The third harmonic is a harmonic other than the two harmonics in the harmonic set. The harmonic set includes the second harmonic, the third harmonic and the fifth harmonic.

[0037] In one 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 oscillator signal lags behind the phase of the first local oscillator signal.

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

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

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

[0045] In one exemplary embodiment, the filter includes: a first sub-circuit and a second sub-circuit, wherein the first sub-circuit includes a first sub-path and a second sub-path, the second sub-circuit includes a third sub-path and a fourth sub-path, 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;

[0046] The input terminal of the first sub-circuit is one input terminal of the filter, the input terminal of the second sub-circuit is the other input terminal of the filter, the output terminal of the first sub-circuit is one output terminal of the filter, and the output terminal of the second sub-circuit is the other output terminal of the filter;

[0047] 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; and the first filtered signal is output.

[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 one exemplary embodiment, the device further includes: a power amplifier, wherein,

[0050] The power amplifier includes: a positive input terminal, a negative input terminal, and an RF 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 the 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 includes a radio frequency signal generating device and a signal transmitter as described in any of the above claims, wherein the signal transmitter is used to transmit the signal generated by the radio frequency signal generating device.

[0055] This invention first mixes the initial signal with a first local oscillator signal and a second local oscillator signal, respectively, using target duty cycles and target phases set to suppress the first and second harmonics. This filters out the first and second harmonics generated during signal transmission. Then, using target filtering parameters set to suppress the third harmonic, the first output signal, after the first and second harmonics have been filtered out, undergoes resonant filtering, thus filtering out the third harmonic of the first output signal. This suppresses the third harmonic components of the third-order intermodulation signal and the image signal generated during the transmission of the initial signal: the first, second, and third harmonics. Therefore, the third-order intermodulation signal and the image signal of the radio frequency signal are simultaneously suppressed. Thus, the problem of low efficiency in suppressing interference signals in the output signal is solved, thereby improving the efficiency of interference signal suppression in the output signal. Attached Figure Description

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

[0057] Figure 2 This is a flowchart of a method for generating radio frequency signals according to an embodiment of the present invention;

[0058] Figure 3 This is a schematic diagram of the harmonic distribution after the superposition of a first local oscillator signal and a second local oscillator signal according to an optional embodiment of the present invention;

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

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

[0061] Figure 6 This is a schematic diagram of a radio frequency signal generation device according to an optional embodiment of this application;

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

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

[0064] Figure 9 This is a schematic diagram of a method for generating radio frequency signals according to an optional embodiment of the present invention;

[0065] Figure 10 This is a structural block diagram of a radio frequency signal generation apparatus according to an embodiment of the present invention. Detailed Implementation

[0066] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples.

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

[0068] The method embodiments provided in this 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 (e.g., a Wi-Fi (Wi-Fi Fidelity) radio frequency transmitter link), and the method according to the embodiments of this application is executed by the radio frequency transmitter link. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for a radio frequency signal generation method according to an embodiment of the present invention. Figure 1 As shown, a mobile terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0069] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the radio frequency signal generation method in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory, and may also include 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 memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0070] The transmission device 106 is used to receive or send data via a network. Specific examples of the network described above may include a wireless network provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission device 106 may be a Radio Frequency (RF) module, used for wireless communication with the Internet.

[0071] This embodiment provides a method for generating radio frequency signals operating on the aforementioned mobile terminal. Figure 2 This is a flowchart of a method for generating radio frequency signals according to an embodiment of the present invention, such as... Figure 2 As shown, the process includes the following steps:

[0072] Step S202: The initial signal is mixed with the first local oscillator signal and the second local oscillator signal respectively to obtain the first output signal. 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 from the target phase. The first local oscillator signal and the second local oscillator signal have the same signal properties except for the phase. 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: Perform resonant filtering on the first output signal using the target filtering parameters to obtain the second output signal. The target filtering parameters are set to suppress the third harmonic generated during signal transmission. The first harmonic, the second harmonic, and the third harmonic are harmonic components that generate the third-order intermodulation signal and the image signal.

[0074] Through the above steps, the initial signal is first mixed with a first local oscillator signal and a second local oscillator signal, respectively, with target duty cycles and target phases set to suppress the first and second harmonics. This filters out the first and second harmonics generated during signal transmission. Then, the first output signal, after filtering out the first and second harmonics, is resonantly filtered using target filtering parameters set to suppress the third harmonic, thus filtering out the third harmonic of the first output signal. This suppresses the harmonic components of the third-order intermodulation signal and the image signal generated during the transmission of the initial signal: the first, second, and third harmonics. Therefore, the third-order intermodulation signal and the image signal of the radio frequency signal are suppressed simultaneously. Thus, the problem of low efficiency in suppressing interference signals in the output signal is solved, thereby improving the efficiency of interference signal suppression in the output signal.

[0075] For example, the entity performing the above steps can be a radio frequency integrated circuit, a zero-IF transmitter link, or a Wi-Fi transmitter link, but is not limited to these. This embodiment of the invention uses an application to a Wi-Fi transmitter link as an example for illustration.

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

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

[0078] Optionally, in this embodiment, the first output signal that suppresses the first harmonic and the second harmonic can be obtained by mixing the initial signal with two square wave signals (i.e., the first local oscillator signal and the second local oscillator signal) that are set to the target duty cycle and are different from the target phase.

[0079] In one exemplary embodiment, the initial signal may be mixed with a first local oscillator signal and a second local oscillator signal respectively in the following manner to obtain a first output signal: 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 the harmonic set that generate the third-order intermodulation signal and the mirror signal, the third harmonic is a harmonic other than the two harmonics in the harmonic set, and the harmonic set includes the second harmonic, the third harmonic and the 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 that suppresses the first harmonic, and the initial signal may be mixed with the second local oscillator signal to obtain a second mixed signal that suppresses the second harmonic; or the initial signal may be mixed with the first local oscillator signal to obtain a first mixed signal that suppresses the second harmonic, and the initial signal may be mixed with the second local oscillator signal to obtain a second mixed signal that suppresses the first harmonic.

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

[0082] In one exemplary embodiment, the target duty cycle may be, but is not limited to, 20% and the target phase may be π / 3; or, the target duty cycle may be 1 / 3 and the target phase may be π / 5; or, the target duty cycle may be 50% and the target phase may be π / 3; or, the target duty cycle may be 50% and the target phase may be 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 can 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 can 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 can differ by π / 5.

[0084] In one exemplary embodiment, the initial signal may be mixed with the first local oscillator signal to obtain a first mixed signal, and the initial signal may be mixed with the second local oscillator signal to obtain a second mixed signal, but not limited to the following method: 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 the phase of the second local oscillator signal lags behind the phase of the first local oscillator signal by π / 3, or the phase of the second local oscillator signal lags behind the 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 one optional implementation, a schematic diagram of the harmonic distribution after the superposition of the first local oscillator signal and the second local oscillator signal is provided. Figure 3 This is a schematic diagram of the harmonic distribution after the superposition of a first local oscillator signal and a second local oscillator signal according to an optional embodiment of the present invention, as shown below. Figure 3 As shown, the first local oscillator signal LO and the second local oscillator signal LO_60 have a 20% duty cycle (target duty cycle). The square wave of LO_60 lags behind LO by π / 3 (target phase difference). The figure shows the harmonic distribution of the first and second local oscillator signals after being superimposed by the mixer. Points A, B, and C in the figure represent the fundamental, third, and fifth harmonics of the first and second local oscillator signals, respectively. Point D represents the second harmonic of the first and second local oscillator signals. Point A in the figure shows the fundamental amplitude of the local oscillator signal, which has the largest amplitude. The amplitude values ​​of the third and fifth harmonics of the local oscillator signal, represented by points B and C, are approximately zero, significantly suppressing the third and fifth harmonics of the first and second local oscillator signals. Point D in the figure shows the second harmonic of the first and second local oscillator signals. It can be seen from the figure that the second harmonic is not eliminated; it can only be eliminated after passing through the subsequent dual-resonant filter.

[0087] In the technical solution provided in step S204 above, the filter can be, but is not limited to, a dual-resonant filter.

[0088] Optionally, in this embodiment, the filter can be used, but is not limited to, in a zero-IF transmitter link. Its main purpose is to eliminate the second harmonic of the local oscillator signal and maximize the transmission of the desired signal, thereby minimizing the IRR signal output by the last stage power amplifier of the link. In this application scenario, the use of a dual-resonant filter to suppress the second harmonic in order to achieve this purpose is within the scope of protection of this invention.

[0089] In one exemplary embodiment, the first output signal can be resonantly filtered using target filtering parameters to obtain a second output signal, but not limited to, in the following manner: 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 besides 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 one optional implementation, taking the third harmonic as the second harmonic as an example, a simulation diagram of the local oscillator signal after passing through a filter is provided. Figure 4 This is a simulation diagram of a local oscillator signal after passing through a filter according to an optional embodiment of the present invention, such as... Figure 4 As shown, the square wave signal is 7GHz. Point A is the resonance point at the fundamental frequency of the first and second local oscillator signals, with infinite impedance. Point B is the resonance point at the second harmonic of the first and second local oscillator signals, with approximately zero impedance.

[0091] In one exemplary embodiment, the first output signal can be input to a filter to obtain the second output signal output by the filter in the following manner, but not limited to: inputting the first output signal to the input terminal of the filter, wherein the input terminal and the output terminal of the filter are connected through a transmission path, the first filtering path includes a first inductor and a capacitor, the first inductor and the capacitor being connected in series between the transmission path and the ground terminal, the second filtering path includes a second inductor connected between the transmission path and the ground terminal, and the second inductance value of the second inductor is n times the first inductance value of the first inductor, where n = m.2 -1, m is the harmonic order of the third harmonic; the signal output from the output terminal of the filter is determined as the second output signal.

[0092] Optionally, in this embodiment, the second inductance value of the second inductor is n times the first inductance value 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] In other words, if the third harmonic is the fifth harmonic, then m = 5 and n = 24; if the third harmonic is the third harmonic, then m = 3 and n = 8; if the third harmonic is the second harmonic, then m = 2 and n = 3. Considering the ease of implementation, this embodiment takes n = 3, that is, a filter is used to suppress the second harmonic.

[0095] In one exemplary embodiment, the first output signal can be input to a filter to obtain the second output signal output by the filter in the following manner, but not limited to: inputting a first mixing signal and a second mixing signal into a first sub-circuit included in the filter to obtain a first filtered signal, and inputting the first mixing signal and the second mixing signal into a second sub-circuit 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 sub-circuit includes a first sub-path and a second sub-path, the second sub-circuit includes a third sub-path and a fourth sub-path, 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.

[0096] Optionally, in this embodiment, the first sub-circuit may be, but is not limited to, a dual to the second sub-circuit.

[0097] Optionally, in this embodiment, the first and third sub-paths 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 and fourth sub-paths may include, but are not limited to, a second inductor connected between the transmission path and the ground terminal. The first and third sub-paths may be used, but are not limited to, to guide the second harmonic signal with zero impedance in the first and second mixing signals to the ground terminal, so that it is not transmitted to the next stage; the second and fourth sub-paths may be used, but are not limited to, 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 may be used, but is not limited to: inputting the first filtered signal into the positive input terminal of the power amplifier and inputting the second filtered signal into the negative input terminal of the power amplifier to obtain the target radio frequency 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, etc.

[0100] Optionally, in this embodiment, since the first harmonic, the second harmonic and the third harmonic in the first filter signal and the second filter signal are suppressed, the interference signals around the target RF signal output by the power amplifier, which are mainly composed of the first harmonic, the second harmonic and the third harmonic, namely the CIM3 signal and the I RR signal, are suppressed.

[0101] This embodiment also provides a radio frequency signal generation device. Figure 5 This is a schematic diagram of a radio frequency signal generation 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 terminal of the mixer 52 is connected to the input terminal 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. The duty cycles of both the first and second local oscillator signals are target duty cycles. The phases of the first and second local oscillator signals differ by a target phase. The first and second local oscillator signals have the same signal properties except for phase. The target duty cycle and target phase are set to suppress the first and second harmonics generated during signal transmission. The initial signal is mixed with both the first and second local oscillator signals to obtain a first output signal. The first output signal is then output.

[0104] The filter 54 is used to input the first output signal; 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; and to output the second output signal, wherein the first harmonic, the second harmonic, and the third harmonic are harmonic components that generate the third-order intermodulation signal and the image signal.

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

[0106] In one alternative implementation, a radio frequency signal generation device is provided. Figure 6 This is a schematic diagram of a radio frequency signal generating device according to an optional embodiment of this 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 signals may include an intermediate frequency signal IF (i.e., the initial signal mentioned above) and two square wave signals (as the first and second local oscillator signals 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 20% duty cycle (target duty cycle), and the LO_60 square wave lags behind LO by π / 3 phase (target phase difference). The single-sided circuit of the dual resonant filter is an inductor L. 2LO and capacitor C 2LO The series inductor resonates at the frequency of the third harmonic of the first local oscillator signal (e.g., in this optional embodiment, it can resonate at the frequency of the second harmonic, thereby suppressing the second harmonic), and the parallel inductor is L. LO The resonance occurs at the fundamental frequency of the first local oscillator signal.

[0107] In one exemplary embodiment, the mixer includes: a first mixer (such as...) Figure 6 The mixer 1 shown) and the second mixer (as shown) Figure 6 As shown in the example mixer 2), the outputs of both the first and second mixers are connected to the input of the filter, and the initial signal (e.g., ...) is input to one input of the first mixer. Figure 6 As shown in the IF diagram), the first local oscillator signal (as shown in the IF diagram) is input to the other input terminal of the first mixer. Figure 6 The initial signal is input to one input terminal of the second mixer (as shown in the diagram LO), and the second local oscillator signal (as shown in the diagram LO) is input to the other input terminal of the second mixer. Figure 6 (LO_60 shown in the diagram); 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 the harmonic set that generate the third-order intermodulation signal and the image signal, the third harmonic is a harmonic other than the two harmonics in the harmonic set, and the harmonic set includes the second harmonic, the third harmonic and the fifth harmonic.

[0108] Optionally, in this embodiment, an initial signal can be input through one input terminal of the first mixer, and a first local oscillator signal can be input through the other input terminal of the first mixer, thereby mixing the initial signal and the first local oscillator signal to obtain a first mixed signal that suppresses the first harmonic. Similarly, an initial signal can be input through one input terminal of the second mixer, and a second local oscillator signal can be input through the other input terminal of the second mixer, thereby mixing the initial signal and the second local oscillator signal to obtain a second mixed signal that suppresses the second harmonic. Alternatively, an initial signal can be input through one input terminal of the first mixer, and a first local oscillator signal can be input through the other input terminal of the first mixer, thereby mixing the initial signal and the first local oscillator signal to obtain a first mixed signal that suppresses the second harmonic. Similarly, an initial signal can be input through one input terminal of the second mixer, and a second local oscillator signal can be input through the other input terminal of the second mixer, thereby mixing the initial signal and the second local oscillator signal to obtain a second mixed signal that suppresses the first harmonic.

[0109] In one 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 and fifth harmonics, 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 and fifth harmonics, 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 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 and third harmonics, 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 and fifth harmonics, and the third harmonic is suppressed by the filter.

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

[0112] Optionally, in this embodiment, assuming 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, then the Fourier transform of the superposition of the two square wave signals can be expressed by Equation 2:

[0113]

[0114] Since the formula contains imaginary coefficients, it is known that to obtain a harmonic suppression signal, the imaginary coefficients must 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 methods to eliminate the imaginary coefficients, thereby obtaining a harmonic suppression signal. Method 1: When the harmonic number n is 3 and the duty cycle D is 1 / 3, the third harmonic is 0; when the harmonic number n is 5 and the phase delay is π / 5, the fifth harmonic is 0. That is, a target duty cycle of 1 / 3 can suppress the third harmonic, a target phase of π / 5 can suppress the fifth harmonic, and a target duty cycle of 1 / 3 and a target phase of π / 5 can simultaneously suppress both the third and fifth harmonics. Method 2: When the harmonic number n is 5 and the duty cycle D is 20%, the fifth harmonic is 0; when the harmonic number n is 3 and the phase delay is π / 3, the third harmonic is 0. That is, a target duty cycle of 20% can suppress the fifth harmonic, a target phase of π / 3 can suppress the third harmonic, and a target duty cycle of 20% and a target phase of π / 3 can simultaneously suppress both the fifth and third harmonics.

[0118] In one exemplary embodiment, the filter includes: a transmission path (such as...) Figure 6 The output paths of RF_p and RF_n shown in the diagram), the first filter path (as shown in the diagram) Figure 6 The L shown 2LO and C 2LO The concatenated path) and the second filtering path (such as Figure 6 The L shown LO The first filtering path includes a first inductor (such as...). Figure 6 The L shown 2LO ) and capacitor components (such as Figure 6 The C shown 2LO The first inductor and the capacitor are connected in series between the transmission path and the ground terminal. The second filter path includes a second inductor (such as...). Figure 6 The L shown 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 value of the second inductor is n times the first inductance value of the first inductor, where n = m 2 -1, where 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 ease of implementation, this embodiment takes n=3, 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 dual-resonant filter.

[0122] Optionally, in this embodiment, the filter can be used, but is not limited to, in a zero-IF transmitter link. Its main purpose is to eliminate the second harmonic of the local oscillator signal and maximize the transmission of the desired signal, thereby minimizing the IRR signal output by the last stage power amplifier of the link. In this application scenario, the use of a dual-resonant filter to suppress the second harmonic in order to achieve this purpose is within the scope of protection of this invention.

[0123] In one exemplary embodiment, the filter includes: a first sub-circuit (such as...) Figure 6 The circuit on the RF_p side shown) and the second sub-circuit (such as Figure 6 The circuit on the RF_n side shown in the diagram), wherein the first sub-circuit includes a first sub-path (such as... Figure 6 The L on the RF_p side shown 2LO and C 2LO The concatenated path) and the second sub-path (such as Figure 6 The L on the RF_p side shownLO The second sub-circuit includes a third sub-circuit (such as the path), and the second sub-circuit includes a third sub-circuit (such as the path). Figure 6 The L on the RF_n side shown 2LO and C 2LO The concatenated path) and the fourth sub-path (such as the concatenated path) and the fourth sub-path (such Figure 6 The L on the RF_n side shown 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 terminal of the first sub-circuit is one input terminal of the filter, the input terminal of the second sub-circuit is the other input terminal of the filter, the output terminal of the first sub-circuit is one output terminal of the filter, and the output terminal of the second sub-circuit is the other output terminal 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 (e.g., Figure 6 The RF_p signal shown in the diagram is used to output the first filtered signal; the second sub-circuit is used to input the first mixer signal and the second mixer signal; the combined signal of the first mixer signal and the second mixer signal is filtered to obtain the second filtered signal (e.g., the RF_p signal shown in the diagram); the second sub-circuit is used to input the first mixer signal and the second mixer signal; the combined signal of the first mixer signal and the second mixer signal is filtered to obtain the second filtered signal (e.g., the RF_p signal shown in the diagram is used to output the first filtered signal ... Figure 6 (as shown in the RF_n signal); output 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 sub-circuit may be, but is not limited to, a dual to the second sub-circuit.

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

[0126] In one exemplary embodiment, the device further includes: a power amplifier, wherein the power amplifier includes: a positive input terminal, a negative input terminal, and an RF output terminal; the positive input terminal is used to input the first filtered signal (e.g., Figure 6The RF_p signal shown in the figure); the negative input terminal is used to input the second filtered signal (such as...). Figure 6 The RF_n signal shown in the figure; 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, etc.

[0128] Optionally, in this embodiment, since the first harmonic, the second harmonic and the third harmonic in the first filter signal and the second filter signal are suppressed, the interference signals around the target RF signal output by the power amplifier, which are mainly composed of the first harmonic, the second harmonic and the third harmonic, namely the CIM3 signal and the I RR signal, are suppressed.

[0129] In one optional implementation, taking the third harmonic as an example of the second harmonic, a schematic diagram of a filter circuit is provided. Figure 8 This 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 (That is, the capacitor) consists of an inductor and a capacitor connected in series, and an inductor connected in parallel with a value of L. LO (i.e., the second inductor). The first filter path includes L. 2LO and C 2LO L 2LO and C 2LO The second filter path is connected in series between the transmission path and the ground terminal, and includes L LO L LO Connected between the transmission path and the ground terminal, inductor L 2LO The inductance value is L LO Three times the sensitivity, i.e., L 2LO =3L LO (n=3).

[0130] Optionally, in this embodiment, assuming the frequency of the incoming signal is ω, and j represents an imaginary number, the impedance of the dual resonant 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 represented by Equation 5:

[0133]

[0134] The zero-point 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 the fundamental frequency and second harmonic frequency of the local oscillator signal, respectively, exhibiting a 2:1 calculation relationship. The inductance L is then calculated. 2LO The inductance value is L LO Three times the sensitivity, i.e., L 2LO =3L LO This multiple relationship must be satisfied. The resonance of the zero and the pole is the double resonant circuit. The fundamental frequency impedance of the local oscillator signal flowing into the double resonant circuit structure is infinite, so it will flow to the next stage circuit but not to ground. The second harmonic signal impedance of the local oscillator signal flowing into the double resonant circuit structure is zero, so it will flow to ground but will not be transmitted to the next stage.

[0137] In one optional implementation, an illustration of a method for generating radio frequency signals is provided. Figure 9 This is a schematic diagram of a radio frequency signal generation method according to an optional embodiment of the present invention, such as... Figure 9 As shown, the two square wave signals input to the upconverter mixer are 20% square wave signals, and one of them has a phase delay of π / 3. The characteristics of the two square wave signals determine that output 1 (i.e., the first output signal) does not contain the signals 3LO (third harmonic)-IF (input intermediate frequency signal) and 5LO (fifth harmonic)±IF. Output 1 flows into a dual resonant filter, and the characteristics of the dual resonant filter determine that output 2 (i.e., the second output signal) does not contain the 2LO (second harmonic) signal. Output 2 does not contain the 2LO, 3LO-IF, and 5LO±IF signals and flows into the power amplifier. The LO-3IF (CIM3) signal in output 3 (i.e., the target RF signal) is suppressed by eliminating 3 and 4, and the LO-IF (IRR) signal in output 3 is suppressed by eliminating 1 and 2. It should be noted that the main innovation of this invention lies in the fact that the existing technology can only eliminate combination 3, while the core of this invention is that it can simultaneously eliminate combination 1, combination 2, combination 3, and combination 4, thereby suppressing the interference signals around the desired output signal of the power amplifier. This is the core innovation of this invention.

[0138] The aforementioned device first mixes the initial signal with a first local oscillator signal and a second local oscillator signal, respectively, using target duty cycles and target phases designed to suppress the first and second harmonics. This filters out the first and second harmonics generated during signal transmission. Then, using target filtering parameters designed to suppress the third harmonic, the first output signal, after the first and second harmonics have been filtered out, undergoes resonant filtering, thus filtering out the third harmonic of the first output signal. This suppresses the third-order intermodulation signal and the harmonic components of the image signal generated during the transmission of the initial signal—the first, second, and third harmonics—simultaneously suppressing both the third-order intermodulation signal and the image signal of the radio frequency signal. Therefore, it solves the problem of low efficiency in suppressing interference signals in the output signal, thereby improving the efficiency of interference signal suppression in the output signal.

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

[0140] This embodiment also provides a radio frequency signal generation apparatus for implementing the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0141] Figure 10 This is a structural block diagram of a radio frequency signal generation apparatus according to an embodiment of the present invention, such as... Figure 10 As shown, the device includes:

[0142] The mixing module 1002 is used to mix the initial signal with a first local oscillator signal and a second local oscillator signal respectively to obtain a first output signal. 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 from the phase of the second local oscillator signal by a target phase. 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. The target filtering parameters are set to suppress the third harmonic generated during signal transmission. The first harmonic, the second harmonic, and the third harmonic are harmonic components that generate third-order intermodulation signals and image signals.

[0144] The aforementioned device first mixes the initial signal with a first local oscillator signal and a second local oscillator signal, respectively, using target duty cycles and target phases designed to suppress the first and second harmonics. This filters out the first and second harmonics generated during signal transmission. Then, using target filtering parameters designed to suppress the third harmonic, the first output signal, after the first and second harmonics have been filtered out, undergoes resonant filtering, thus filtering out the third harmonic of the first output signal. This suppresses the third-order intermodulation signal and the harmonic components of the image signal generated during the transmission of the initial signal—the first, second, and third harmonics—simultaneously suppressing both the third-order intermodulation signal and the image signal of the radio frequency signal. Therefore, it solves the problem of low efficiency in suppressing interference signals in the output signal, thereby improving the efficiency of interference signal suppression in the output signal.

[0145] In one exemplary embodiment, the mixer module includes:

[0146] A mixing unit is used to mix the initial signal with the first local oscillator signal to obtain a first mixed signal, and 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, the third harmonic is a harmonic in the harmonic set other than the two harmonics, and the harmonic set includes the second harmonic, the third harmonic and the fifth harmonic.

[0147] In one 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 has a duty cycle of 50% and a phase of π / 3; or...

[0150] The target has a duty cycle of 50% and a phase of π / 5.

[0151] In one exemplary embodiment, the mixer unit is configured 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 the phase of the second local oscillator signal lags behind the phase of the first local oscillator signal by π / 3, or the phase of the second local oscillator signal lags behind the phase of the first local oscillator signal by π / 5.

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

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

[0155] In one exemplary embodiment, the input unit is configured to:

[0156] The first output signal is input to the input terminal of the filter, wherein the input terminal and the output terminal of the filter are connected through a transmission path. The first filtering path includes a first inductor and a capacitor, which are connected in series between the transmission path and the ground terminal. The second filtering path includes a second inductor, which is connected between the transmission path and the ground terminal. The second inductance value of the second inductor 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 output from the output terminal of the filter is determined as the second output signal.

[0158] In one exemplary embodiment, the input unit is further configured to:

[0159] A first mixed signal and a second mixed signal are input into a first sub-circuit of the filter to obtain a first filtered signal, and the first mixed signal and the second mixed signal are input into a second sub-circuit of the filter to obtain a second filtered signal. The first mixed signal is obtained by mixing the initial signal with the first local oscillator signal, and the second mixed signal is obtained by mixing the initial signal with the second local oscillator signal. The first sub-circuit includes a first sub-path and a second sub-path, the second sub-circuit includes a third sub-path and a fourth sub-path, 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.

[0160] In one exemplary embodiment, the apparatus further includes:

[0161] The input module is configured to, after resonant filtering the first output signal using the target filtering parameters to obtain the second output signal, 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, thereby obtaining the target radio frequency 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, they can be implemented in the following ways, but are not limited to: all the above modules are located in the same processor; or, the above modules are located in different processors in any combination.

[0163] Embodiments of the present invention also provide a computer-readable storage medium storing a computer program, wherein the computer program is configured to perform the steps in any of the above method embodiments when executed.

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

[0165] Embodiments of the present invention also provide an electronic device including a memory and a processor, the memory storing a computer program and the processor being configured to run the computer program to perform the steps in any of the above method embodiments.

[0166] In one 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] Specific examples in this embodiment can be found in the examples described in the above embodiments and exemplary implementations, and will not be repeated here.

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

[0169] In one exemplary embodiment, the signal transmitter described above may include any device with radio frequency signal transmission capabilities, such as a transmitting antenna, etc.

[0170] Specific examples in this embodiment can be found in the examples described in the above embodiments and exemplary implementations, and will not be repeated here.

[0171] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0172] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for generating radio frequency signals, characterized in that, include: The initial signal is mixed with the first local oscillator signal and the second local oscillator signal respectively to obtain the first output signal. 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 from the target phase. The first local oscillator signal and the second local oscillator signal have the same signal properties except for the phase. 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 the target filtering parameters to obtain the second output signal. The target filtering parameters are set to suppress the third harmonic generated during signal transmission. The first harmonic, the second harmonic, and the third harmonic are harmonic components that generate the third-order intermodulation signal and the image signal.

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

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

4. The method according to claim 3, characterized in that, The step of 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: 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 the phase of the second local oscillator signal lags behind the phase of the first local oscillator signal by π / 3, or the phase of the second local oscillator signal lags behind the 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 target filtering parameters to obtain the second output signal includes: The first output signal is input into a filter to obtain the second output signal output by the filter. 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 the ground terminal. The second filtering path is used to transmit other signals in the first output signal besides 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. 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 includes: The first output signal is input to the input terminal of the filter. The input terminal and output terminal of the filter are connected via a transmission path. The first filtering path includes a first inductor and a capacitor, which are connected in series between the transmission path and the ground terminal. The second filtering path includes a second inductor connected between the transmission path and the ground terminal. The second inductance value of the second inductor is n times the first inductance value of the first inductor, where n = m. 2 -1, where m is the harmonic order of the third harmonic; The signal output 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 includes: A first mixed signal and a second mixed signal are input into a first sub-circuit of the filter to obtain a first filtered signal, and the first mixed signal and the second mixed signal are input into a second sub-circuit of the filter to obtain a second filtered signal. The first mixed signal is obtained by mixing the initial signal with the first local oscillator signal, and the second mixed signal is obtained by mixing the initial signal with the second local oscillator signal. The first sub-circuit includes a first sub-path and a second sub-path, the second sub-circuit includes a third sub-path and a fourth sub-path, 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.

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

9. A radio frequency signal generation device, characterized in that, include: Mixers and filters, among which, The output of the mixer is connected to the input of the filter; The mixer is used to input an initial signal, a first local oscillator signal, and a second local oscillator signal. The duty cycles of both the first and second local oscillator signals are target duty cycles. The phases of the first and second local oscillator signals differ by a target phase. The first and second local oscillator signals have the same signal properties except for phase. The target duty cycle and target phase are set to suppress the first and second harmonics generated during signal transmission. The initial signal is mixed with both the first and second local oscillator signals to obtain a first output signal. The first output signal is then output. The filter is used to input the first output signal; 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; and to output the second output signal, wherein the first harmonic, the second harmonic, and the third harmonic are harmonic components that generate the third-order intermodulation signal and the image signal.

10. The device according to claim 9, characterized in that, The mixer includes: a first mixer and a second mixer, wherein, The output terminals of the first mixer and the second mixer are both connected to the input terminal of the filter. The initial signal is input to one input terminal of the first mixer, and the first local oscillator signal is input to the other input terminal of the first mixer. The initial signal is input to one input terminal of the second mixer, and the second local oscillator signal is input to the other input terminal 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 the harmonic set that generate the third-order intermodulation signal and the mirror signal. The third harmonic is a harmonic other than the two harmonics in the harmonic set. The harmonic set includes the second harmonic, the third harmonic and the 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 oscillator signal lags behind the phase of the first local oscillator signal.

12. The device according to claim 9, characterized in that, The filter includes: a transmission path, a first filtering path, and a second filtering path, wherein... The input terminal and the output terminal of the filter are connected through the transmission path. The first filtering path includes a first inductor and a capacitor, which are connected in series between the transmission path and the ground terminal. The second filtering path includes a second inductor connected between the transmission path and the ground terminal. The first filtering path resonates at the frequency of the third harmonic, and the second filtering 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 value of the second inductor is n times the first inductance value of the first inductor, where n = m 2 -1, where m is the harmonic order of the third harmonic.

14. The device according to claim 12, characterized in that, The filter includes: a first sub-circuit and a second sub-circuit, wherein the first sub-circuit includes a first sub-path and a second sub-path, the second sub-circuit includes a third sub-path and a fourth sub-path, 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 terminal of the first sub-circuit is one input terminal of the filter, the input terminal of the second sub-circuit is the other input terminal of the filter, the output terminal of the first sub-circuit is one output terminal of the filter, and the output terminal of the second sub-circuit is the other output terminal 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; and the first filtered signal is output. 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 includes: a power amplifier, wherein... The power amplifier includes: a positive input terminal, a negative input terminal, and an RF 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 the target radio frequency signal.

16. A radio frequency transmitter, characterized in that, The radio frequency transmitter includes the radio frequency signal generating device and the 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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