Calibration waveform generator and radio frequency chip calibration system, method, device, medium

Abstract

The present application discloses a calibration waveform generator, a radio frequency chip calibration system, method, device, and medium, which relate to the technical field of radio frequency transceiver chips and are used to implement the calibration of zero-IF radio frequency transceiver chips. Aiming at the problem of slow calibration speed of I / Q mismatch in traditional calibration schemes, a calibration waveform generator is provided, which can achieve DCOS calibration and I / Q mismatch calibration of transceiver chips. By simultaneously generating multiple single tones with equal amplitudes to achieve multi-tone sweeping, the calibration time required for I / Q mismatch mirror calibration can be greatly shortened, thereby accelerating the startup speed of radio frequency transceiver chips and facilitating background calibration in the background without affecting services, improving the performance of broadband zero-IF transceivers.

Description

Technical Field

[0001] The present application relates to the field of radio frequency transceiver chips, and particularly to a calibration waveform generator, a radio frequency chip calibration system, method, device, and medium. Background Art

[0002] Zero-IF is a typical architecture of radio frequency transceiver chips. Especially in the face of increasingly wide bandwidth requirements, the zero-IF architecture can effectively reduce the design difficulty of analog-to-digital conversion (AD) / digital-to-analog conversion (DA) and system power consumption. However, zero-IF has problems such as image caused by I / Q mismatch (I, In-Phase; Q, Quadrature; I / Q mismatch means the mismatch between the two orthogonal branches of the I channel and the Q channel) and local oscillator leakage caused by direct current. Link calibration methods are needed to improve the above problems to meet the system link requirements.

[0003] In related technologies, I / Q mismatch is commonly calibrated using a single-tone sweep mode. However, for broadband signals above 100 MHz, using the single-tone sweep mode for calibration will result in a very slow calibration speed, affecting the startup response time and also affecting normal services in the background calibration mode.

[0004] Therefore, those skilled in the art now urgently need a calibration waveform generator to solve the problem of slow calibration speed when the traditional calibration scheme realizes I / Q mismatch calibration of zero-IF radio frequency transceiver chips. Summary of the Invention

[0005] The purpose of the present application is to provide a calibration waveform generator, a radio frequency chip calibration system, method, device, and medium to solve the problem of slow calibration speed when the traditional calibration scheme realizes I / Q mismatch calibration of zero-IF radio frequency transceiver chips.

[0006] To solve the above technical problems, the present application provides a calibration waveform generator, including: a plurality of digital oscillators, a signal adder, and a register;

[0007] The output ends of each of the digital oscillators are connected to the input ends of the signal adder, and are used to generate a plurality of single-tone signals with the same amplitude;

[0008] The register is connected to each of the digital oscillators and is used to store single-tone frequency interval information, sweep step information, and sweep speed information;

[0009] The signal adder is used to superimpose a plurality of single-tone signals with the same amplitude to obtain a multi-tone signal, so as to realize I / Q mismatch calibration and DCOS calibration of a zero-IF radio frequency transceiver.

[0010] In a possible embodiment, it further includes: a broadband modulation signal generation module;

[0011] The broadband modulation signal generation module is used to generate a broadband modulation signal to achieve filter calibration of the zero-IF RF transceiver;

[0012] Among them, the bandwidth of the broadband modulation signal covers the sideband rejection bandwidth of the filter in the zero-IF RF transceiver.

[0013] In a possible embodiment, the broadband modulation signal generation module includes: a pseudo-random number sequence generation module and a signal modulation module;

[0014] The pseudo-random number sequence generation module is connected to the signal modulation module;

[0015] The pseudo-random number sequence generation module is used to generate a pseudo-random number sequence;

[0016] The signal modulation module is used to modulate the received pseudo-random number sequence into the broadband modulation signal.

[0017] In a possible embodiment, the pseudo-random number sequence generation module is a pseudo-random binary sequence generation module;

[0018] Correspondingly, the broadband modulation signal is a binary phase shift keying signal.

[0019] To solve the above technical problems, the present application also provides a radio frequency chip calibration system, including: the calibration waveform generator, the radio frequency chip and the spectrum analyzer as described above;

[0020] Among them, the calibration waveform generator is connected to the transmit-end baseband channel and the transmit-end and receive-end coupling channels of the radio frequency chip;

[0021] The spectrum analyzer is connected to the radio frequency output end of the radio frequency chip.

[0022] To solve the above technical problems, the present application also provides a radio frequency chip calibration method, which is applied to the calibration waveform generator as described above, and includes:

[0023] Generating a multi-tone signal obtained by superimposing multiple uniformly spaced and same-amplitude single-tone signals according to the pre-configured single-tone frequency interval information to perform multi-tone sweeping; and observing the radio frequency output end of the radio frequency chip after each multi-tone sweeping to obtain local oscillator leakage data and I / Q mismatch mirror data; wherein, the step of each multi-tone sweeping action is determined according to the pre-configured sweeping step, and the interval of each multi-tone sweeping action is determined according to the pre-configured sweeping speed;

[0024] Performing DCOS calibration of the radio frequency chip according to the local oscillator leakage data obtained by performing multi-tone sweeping multiple times;

[0025] Based on the I / Q mismatch image data obtained by performing multi-tone sweeping multiple times, perform I / Q mismatch calibration on the RF chip.

[0026] In a possible embodiment, the calibration waveform generator further includes: a broadband modulation signal generation module; the broadband modulation signal generation module is used to generate a broadband modulation signal to implement filter calibration of a zero-IF RF transceiver; wherein, the bandwidth of the broadband modulation signal covers the sideband rejection bandwidth of the filter in the zero-IF RF transceiver.

[0027] Correspondingly, before generating a multi-tone signal obtained by superimposing a plurality of uniformly spaced and same-amplitude single-tone signals according to the pre-configured single-tone frequency interval information to perform multi-tone sweeping, it further includes:

[0028] Input the broadband modulation signal into the transmit-end baseband channel and the transmit-end and receive-end coupling channels of the RF chip respectively.

[0029] Realize filter calibration of the RF chip through the filter envelope observed at the RF output end.

[0030] To solve the above technical problems, the present application further provides a RF chip calibration device, which is applied to the calibration waveform generator as described above, and includes:

[0031] A multi-tone sweeping module, which is used to generate a multi-tone signal obtained by superimposing a plurality of uniformly spaced and same-amplitude single-tone signals according to the pre-configured single-tone frequency interval information to perform multi-tone sweeping; and observe the RF output end of the RF chip after each multi-tone sweeping to obtain local oscillator leakage data and I / Q mismatch image data; wherein, the step of each multi-tone sweeping action is determined according to the pre-configured sweeping step, and the interval of each multi-tone sweeping action is determined according to the pre-configured sweeping speed.

[0032] A DCOS calibration module, which is used to perform DCOS calibration on the RF chip according to the local oscillator leakage data obtained by performing multi-tone sweeping multiple times.

[0033] An I / Q mismatch calibration module, which is used to perform I / Q mismatch calibration on the RF chip according to the I / Q mismatch image data obtained by performing multi-tone sweeping multiple times.

[0034] To solve the above technical problems, the present application further provides a RF chip calibration device, including:

[0035] A memory, which is used to store a calibration configuration program.

[0036] A processor, which is used to implement the steps of the above-mentioned RF chip calibration method when executing the calibration configuration program.

[0037] To solve the above technical problems, the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned radio frequency chip calibration method are implemented.

[0038] A calibration waveform generator provided by the present application obtains a multi-tone signal from multiple single-tone signals with the same amplitude generated by multiple digital oscillators for use as a calibration waveform for I / Q mismatch calibration and DCOS calibration. When performing multi-tone sweeping each time, local oscillator leakage can be observed at the radio frequency output port to calibrate DCOS. At the same time, since the frequencies of the generated single-tone signals are known, their corresponding image frequencies are known. Therefore, the multi-tone sweeping implemented by multiple single-tone signals can also calibrate the image caused by I / Q mismatch. Moreover, in this calibration waveform generator, the intervals, sweeping steps, and sweeping speeds of multiple single-tone frequencies are configured through registers, thereby completing the multi-tone sweeping of a complete zero-IF transceiver, which can greatly shorten the calibration time and thus improve the performance of the broadband zero-IF transceiver.

[0039] The radio frequency chip calibration system, method, device, and computer-readable storage medium provided by the present application correspond to the above calibration waveform generator, and have the same effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] To more clearly illustrate the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0041] Figure 1 It is a structural diagram of a calibration waveform generator provided by the present invention;

[0042] Figure 2 It is a structural diagram of a radio frequency chip calibration system provided by the present invention;

[0043] Figure 3 It is a flowchart of a radio frequency chip calibration method provided by the present invention;

[0044] Figure 4 It is a structural diagram of a radio frequency chip calibration device provided by the present invention;

[0045] Figure 5 It is a structural diagram of another radio frequency chip calibration device provided by the present invention;

[0046] Among them, 10 is a multi-tone signal generation module, 11 is a digital oscillator, 12 is a signal adder, 20 is a broadband modulation signal generation module, 21 is a pseudo-random number sequence generation module, and 22 is a signal modulation module. Detailed implementation manners

[0047] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0048] The core of the present application is to provide a calibration waveform generator, a radio frequency chip calibration system, method, device, and medium.

[0049] In order to enable those skilled in the art to better understand the solution of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0050] For a broadband zero-IF transceiver, the traditional I / Q mismatch (I, In-Phase, in-phase; Q, Quadrature, orthogonal; I / Q mismatch means the mismatch between the two orthogonal branches of the I channel and the Q channel) is calibrated using a single-tone sweep mode. However, for broadband signals above 100 MHz, using the single-tone sweep mode for calibration will result in a very slow calibration speed, affecting the startup response time and also affecting normal services in the background calibration mode.

[0051] To solve the above problems, the present application provides a calibration waveform generator, as Figure 1 shown, including: a plurality of digital oscillators, a signal adder, and a register;

[0052] The output ends of the digital oscillators are connected to the input ends of the signal adder, and are used to generate a plurality of single-tone signals with the same amplitude;

[0053] The register is connected to each digital oscillator and is used to store single-tone frequency interval information, sweep step information, and sweep speed information;

[0054] The signal adder is used to superimpose a plurality of single-tones with the same amplitude to obtain a multi-tone signal, so as to realize I / Q mismatch calibration and DCOS calibration of a zero-IF radio frequency transceiver.

[0055] Further, the application scenario of the above calibration waveform generator is as Figure 2 shown. Figure 2 It is the calibration performed by the calibration waveform generator on the transmit-end baseband channel (TX DUC, that is, the transmit channel) of a broadband zero-IF transceiver.

[0056] That is, when I / Q mismatch calibration and DC offset (DCOS) calibration are required for a broadband zero-IF transceiver, first, the above-mentioned calibration waveform generator is added outside the TX DUC. The calibration waveform generator generates corresponding calibration waveforms (such as the above-mentioned multi-tone signal and the broadband modulation signal in the subsequent embodiments) to achieve the corresponding calibration work.

[0057] It should be noted that, Figure 2 The scenario is only for the calibration of the TX baseband channel of the transceiver. If a complete calibration is to be achieved, the RX baseband channel of the transceiver also needs to be calibrated. In practical applications, generally, the TX baseband channel is calibrated first, and after confirming that the TX baseband channel is correct, the RX baseband channel is calibrated through the TX-to-RX coupling channel. The implementation is the same as above, and will not be elaborated in this embodiment.

[0058] In addition, it should be noted that in Figure 1 a shown calibration waveform generator, the number of digital oscillators (NCOs) is 4 (NCO1~NCO4), which means Figure 1 the shown calibration waveform generator can simultaneously generate 4 single tones, and the output multi-tone signal is obtained from these 4 single tones. However, Figure 1 the calibration waveform generator shown in is only one possible implementation scheme. This embodiment does not limit the number of digital oscillators and the number of simultaneously generated single-tone signals. 4 is only one possible implementation scheme. In fact, as long as the number of digital oscillators and single-tone signals is greater than 1, the purpose of improving the calibration time can be achieved.

[0059] It should be noted that although this application does not limit the specific number of digital oscillators and generated single-tone signals, a preferred implementation scheme is provided where the number of digital oscillators and single-tone signals is an even number.

[0060] The multi-tone sweep achieved by an even number of single-tone signals has stronger symmetry and has a better calibration effect for I / Q mismatch calibration, which is a calibration for mirror images.

[0061] Furthermore, based on the calibration waveform generator provided in the above embodiment, this embodiment also provides a preferred implementation scheme. The above-mentioned calibration waveform generator further includes: a broadband modulation signal generation module;

[0062] The broadband modulation signal generation module is used to generate a broadband modulation signal to achieve filter calibration of the zero-IF radio frequency transceiver;

[0063] wherein, the bandwidth of the broadband modulation signal covers the sideband rejection bandwidth of the filter in the zero-IF radio frequency transceiver.

[0064] The broadband modulation signal generated by the broadband modulation signal generation module in this embodiment is a signal whose bandwidth covers the sideband suppression bandwidth of the filter in the zero-IF transceiver, and is used to calibrate parameters such as the suppression degree and flatness of the filter.

[0065] It should be noted that for the filter calibration implemented based on this embodiment, its application scenario is the same as Figure 2 shown. It's just that the calibration waveform output by the calibration waveform generator at this time is the broadband modulation signal generated by the broadband modulation signal generation module. In addition, similarly to the above, filter calibration generally first calibrates the TX baseband channel. By observing the complete filter shape at the RF output end, parameters such as the suppression degree and flatness of the filter can be calibrated. Then, the RX baseband channel is calibrated through the TX-to-RX coupling channel. The complete filter envelope of the adjustment signal is obtained by performing a fast Fourier transform (FFT) in the digital domain of the RX.

[0066] It should also be noted that after generating the broadband modulation signal, this embodiment also provides a preferred implementation:

[0067] Perform windowing processing on the broadband modulation signal to make the roll-off of the digital filter as steep as possible to prevent affecting the analog filter.

[0068] For the above-mentioned bandwidth modulation signal, the above embodiment only limits its bandwidth, requiring that the bandwidth of the bandwidth modulation signal covers the sideband suppression bandwidth of the filter in the zero-IF RF transceiver to meet the calibration requirements of parameters such as the suppression degree and flatness of the calibration filter. However, there is no strict limitation on the specific form of the bandwidth modulation signal. The bandwidth modulation signal can be common modulation signals obtained by converting analog signals into data values, such as Binary Phase Shift Keying (BPSK) signal, Quadrature Phase Shift Keying (QPSK) signal, 8 Phase Shift Keying (8PSK) signal, and 16-Phase Shift Keying (16PSK) signal. Similarly, the specific types and models of the broadband modulation signal generation module should also adapt to the specific signal type of the selected bandwidth modulation signal, and this embodiment does not limit this.

[0069] As can be seen from the above, the calibration waveform generator provided in this embodiment can output specific calibration waveforms to achieve filter calibration, DCOS calibration, and I / Q mismatch calibration of a broadband zero-IF transceiver. Among them, the multi-tone signal generated by the digital oscillator and the signal superposition module is used to achieve multi-tone sweep frequency, that is, to achieve DCOS calibration and I / Q mismatch calibration; the broadband modulation signal generated by the broadband modulation signal generation module is used to achieve filter calibration. Therefore, in Figure 1 the calibration waveform generator shown, it is also possible to control the calibration waveform output by the calibration waveform generator through a signal selection module such as a multiplexer to meet different calibration requirements of the broadband zero-IF transceiver.

[0070] In addition, in Figure 1 in order to be equivalent to the broadband modulation signal generation module, the digital oscillator and the signal superposition module (which may also include registers) are collectively referred to as the multi-tone signal generation module.

[0071] Furthermore, for the specific implementation of the broadband modulation signal generation module, this embodiment also provides a possible implementation scheme, as shown in Figure 1 the above broadband modulation signal generation module includes: a pseudo-random number sequence generation module and a signal modulation module;

[0072] The pseudo-random number sequence generation module is connected to the signal modulation module;

[0073] The pseudo-random number sequence generation module is used to generate a pseudo-random number sequence;

[0074] The signal modulation module is used to modulate the received pseudo-random number sequence into a broadband modulation signal.

[0075] That is, in the broadband modulation signal generation module provided in this embodiment, the pseudo-random number sequence generation module is used to provide a pseudo-random number sequence as an analog signal, and the analog signal is modulated into a digital signal by the signal modulation module to obtain a broadband modulation signal for realizing filter calibration.

[0076] Furthermore, it is easy to understand that the pseudo-random number sequence provided by the pseudo-random number sequence generation module directly affects the broadband modulation signal modulated by the broadband modulation signal generation module. In a possible embodiment, as shown in Figure 1 the above pseudo-random number sequence generation module is specifically a pseudo-random binary sequence (PRBS) generation module. Correspondingly, the signal received by the signal modulation module is a pseudo-random binary sequence, and the adjusted generated signal is a BPSK signal.

[0077] It should be noted that in the filter calibration scenario targeted by this embodiment, it is only required that the bandwidth modulation signal satisfies the sideband suppression bandwidth of the pre-filter of the bandwidth covering digital-to-analog converter (DAC), and there are no requirements for the amount of data that can be contained in one bit of the signal. Therefore, to save resources, this embodiment uses a BPSK signal as the above-mentioned broadband modulation signal. In addition, compared with other modulation signals, the BPSK signal has stronger anti-noise ability, which meets the calibration requirements of the radio frequency transceiver.

[0078] Finally, based on the implementation solutions provided in the above embodiments, the complete calibration process that can be achieved by the calibration waveform generator is also described with examples:

[0079] First, for the sequence of filter calibration, I / Q mismatch calibration, and DCOS calibration, filter calibration is performed first, and then I / Q mismatch calibration and DCOS calibration are performed.

[0080] As Figure 2 shown, taking the calibration of the TX baseband channel of the transceiver as an example, a calibration waveform generator is added to the corresponding baseband channel. At this time, the calibration waveform generator is in the filter calibration mode, and the output calibration waveform is the broadband modulation signal generated by the broadband modulation signal generation module.

[0081] Assume that the bandwidth of the transceiver filter is 400 MHz (200 MHz for each of I / Q), and the single-sided transition band is 50 MHz. At this time, the calibration waveform generator can generate a broadband modulation signal with a bandwidth greater than 500 MHz. Then, a complete filter shape is observed at the RF output end for calibrating parameters such as filter suppression and flatness.

[0082] When the filter calibration of the TX baseband channel is completed, the complete filter envelope of the adjustment signal can be obtained by performing FFT in the digital domain of the RX through the TX-to-RX coupling channel to achieve complete filter calibration.

[0083] After that, after the filter calibration is completed, the key is to perform I / Q mismatch calibration and DCOS calibration on the transceiver. At this time, the calibration waveform generator is in the multi-tone sweep mode, and the output calibration waveform is the multi-tone signal generated by the multi-tone signal generation module.

[0084] Taking a zero-IF radio frequency transceiver with a bandwidth of 400 MHz (200 MHz for each of I / Q) as an example, the -3 dB bandwidth of each of the I / Q branches is 200 MHz, the transition band of the low-pass filter is 50 MHz, the suppression at the sideband of 50 MHz is -35 dBc, and the in-band flatness is ±1 dB.

[0085] At this time, it is possible to start scanning from the negative frequency of the Q branch, and generate four baseband single tones with equal amplitude and evenly spaced intervals of -250M, -230M, -210M, and -190M respectively, so as to obtain a multi-tone signal to complete a multi-tone sweep operation. After the generation of the 4 single-tone signals, without considering the intermodulation spurs of the 4 digital oscillators, by observing the local oscillator leakage at the RF output after the multi-tone sweep (the baseband single tone will not be 0Hz), the DCOS calibration can be completed.

[0086] In addition, since the generated single-tone frequencies are known, that is, the baseband signals are known, the mirror images corresponding to the I branch can also be observed, so as to implement the corresponding I / Q mismatch calibration operation.

[0087] After that, the above is the calibration performed in a multi-tone sweep operation. The frequencies of the 4 single-tone signals corresponding to the next multi-tone sweep can be set to -200M, -180M, -160M, and -140M to implement the second multi-tone sweep operation. The single-tone frequency interval, the multi-tone sweep step, and the sweep speed for each multi-tone sweep can all be pre-configured through registers. In this way, by gradually performing the multi-tone sweep, the in-band flatness calibration of the low-pass filter of the Q branch can be completed. It should be noted that in this embodiment, no specific limitations are imposed on the specific values of the single-tone frequency interval, the sweep step, and the sweep speed, and appropriate values can be freely selected according to the actual calibration requirements. However, generally, for the single-tone signals generated corresponding to the first multi-tone sweep and the last multi-tone sweep, at least one of the single-tone signals should have a frequency equal to the sideband frequency of the transceiver.

[0088] Finally, after completing the calibration of the Q branch filter, the DCOS calibration, and the I / Q mismatch mirror calibration, the multi-tone sweep calibration operation of the I branch can be started until the in-band sweep is completed. Thus, the complete calibration process of the transceiver is completed.

[0089] In summary, a calibration waveform generator provided by the present application can greatly shorten the calibration time required for I / Q mismatch mirror calibration by simultaneously generating multiple single tones with equal amplitude to achieve multi-tone sweep, thereby accelerating the startup speed of the RF transceiver chip and facilitating the completion of background calibration in the background without affecting services. And this calibration waveform generator also supports the implementation of DCOS calibration of the RF transceiver chip to calibrate the local oscillator leakage problem caused by direct current. In one embodiment, the calibration waveform generator realizes the filter calibration of the RF transceiver chip by generating a broadband modulation signal, expanding the calibration items supported by the calibration waveform generator, thereby improving the performance of the broadband zero-IF transceiver.

[0090] In the above embodiment, a calibration waveform generator is described in detail. The present application also provides an embodiment corresponding to a calibration system for an RF chip. As Figure 2As shown in the figure, a radio frequency chip calibration system includes: a calibration waveform generator, a radio frequency chip, and a spectrum analyzer as described in the above embodiments;

[0091] Among them, the calibration waveform generator is connected to the transmitting end baseband channel and the transmitting end and receiving end coupling channels of the radio frequency chip;

[0092] The spectrum analyzer is connected to the radio frequency output end of the radio frequency chip.

[0093] Since the embodiments of the system part correspond to the embodiments of the above calibration waveform generator part, for the embodiments of the system part, please refer to the description of the embodiments of the calibration waveform generator part, and will not be elaborated here temporarily.

[0094] In addition, this application also provides an embodiment corresponding to a radio frequency chip calibration method, which is applied to the calibration waveform generator as described in the above embodiments. As Figure 3 shown in the figure, the method includes:

[0095] S11: Generate a multi-tone signal obtained by superimposing multiple uniformly spaced and same-amplitude single-tone signals according to the pre-configured single-tone frequency interval information to perform multi-tone sweep; and observe the radio frequency output end of the radio frequency chip after each multi-tone sweep to obtain local oscillator leakage data and I / Q mismatch mirror data.

[0096] Among them, the step of each multi-tone sweep operation is determined according to the pre-configured sweep step, and the interval of each multi-tone sweep operation is determined according to the pre-configured sweep speed.

[0097] S12: Perform DCOS calibration of the radio frequency chip according to the local oscillator leakage data obtained by performing multi-tone sweep multiple times.

[0098] S13: Perform I / Q mismatch calibration of the radio frequency chip according to the I / Q mismatch mirror data obtained by performing multi-tone sweep multiple times.

[0099] As can be seen from the above embodiments of the calibration waveform generator part, steps S11 to S13 correspond to DCOS calibration and I / Q mismatch mirror calibration realized by multi-tone sweep. By simultaneously generating multiple single tones with equal amplitudes to achieve multi-tone sweep, the calibration time required for I / Q mismatch mirror calibration can be greatly shortened, thereby accelerating the startup speed of the radio frequency transceiver chip and facilitating background calibration in the background without affecting services.

[0100] Further, in a possible embodiment of the above calibration waveform generator part, the calibration waveform generator further includes: a broadband modulation signal generation module; the broadband modulation signal generation module is used to generate a broadband modulation signal to realize filter calibration of a zero-IF radio frequency transceiver; wherein, the bandwidth of the broadband modulation signal covers the sideband suppression bandwidth of the filter in the zero-IF radio frequency transceiver.

[0101] Correspondingly, this embodiment also provides a possible embodiment. Before step S11, the method further includes:

[0102] S14: Input the broadband modulation signal into the transmit - end baseband channel and the transmit - and - receive - end coupling channel of the RF chip respectively;

[0103] S15: Achieve the filter calibration of the RF chip through the filter envelope observed at the RF output end.

[0104] Similarly to the above, steps S14 and S15 in this embodiment correspond to the filter calibration part in the above - mentioned embodiment. By generating a broadband modulation signal to calibrate parameters such as the suppression ratio and flatness of the filter of the RF transceiver chip, the performance of the broadband zero - IF transceiver is improved.

[0105] In the above - mentioned embodiment, a method for calibrating an RF chip is described in detail. The present application also provides an embodiment corresponding to an RF chip calibration device. It should be noted that the present application describes the embodiment of the device part from two perspectives, one is from the perspective of functional modules, and the other is from the perspective of hardware.

[0106] From the perspective of functional modules, this embodiment provides an RF chip calibration device, as Figure 4 shown, including:

[0107] A multi - tone sweep module 31, configured to generate a multi - tone signal obtained by superimposing multiple single - tone signals with uniform intervals and the same amplitude according to the pre - configured single - tone frequency interval information to perform multi - tone sweep; and observe the RF output end of the RF chip after each multi - tone sweep to obtain local oscillator leakage data and I / Q mismatch mirror data; wherein, the step of each multi - tone sweep action is determined according to the pre - configured sweep step, and the interval of each multi - tone sweep action is determined according to the pre - configured sweep speed;

[0108] A DCOS calibration module 32, configured to perform DCOS calibration of the RF chip according to the local oscillator leakage data obtained by performing multi - tone sweep multiple times;

[0109] An I / Q mismatch calibration module 33, configured to perform I / Q mismatch calibration of the RF chip according to the I / Q mismatch mirror data obtained by performing multi - tone sweep multiple times.

[0110] Since the embodiment of the device part corresponds to the embodiment of the method part, for the description of the embodiment of the device part, please refer to the description of the embodiment of the method part, which will not be elaborated here for the time being.

[0111] Figure 5 The structure diagram of an RF chip calibration device provided in another embodiment of the present application is as Figure 5As shown in the figure, a radio frequency chip calibration device includes: a memory 40 for storing a calibration configuration program;

[0112] a processor 41 for implementing the steps of a radio frequency chip calibration method as described in the foregoing embodiment when executing the calibration configuration program.

[0113] A radio frequency chip calibration device provided in this embodiment may include, but is not limited to, a mobile terminal, a personal computer, a workstation, etc.

[0114] Among them, the processor 41 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 41 may be implemented in at least one hardware form of a digital signal processor (DSP), a field-programmable gate array (FPGA), or a programmable logic array (PLA). The processor 41 may also include a main processor and a coprocessor. The main processor is a processor for processing data in the wake state, also known as a central processing unit (CPU); the coprocessor is a low-power processor for processing data in the standby state. In some embodiments, the processor 41 may be integrated with a graphics processing unit (GPU), and the GPU is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the processor 41 may further include an artificial intelligence (AI) processor, and the AI processor is used to process computational operations related to machine learning.

[0115] The memory 40 may include one or more computer-readable storage media, and the computer-readable storage media may be non-transitory. The memory 40 may further include high-speed random access memory and non-volatile memory, such as one or more disk storage devices and flash storage devices. In this embodiment, the memory 40 is at least used to store the following calibration configuration program 401. After the calibration configuration program is loaded and executed by the processor 41, it can implement the relevant steps of a radio frequency chip calibration method disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 40 may also include an operating system 402 and data 403, etc., and the storage method may be temporary storage or permanent storage. Among them, the operating system 402 may include Windows, Unix, Linux, etc. The data 403 may include, but is not limited to, a radio frequency chip calibration method, etc.

[0116] In some embodiments, a radio frequency chip calibration device may further include a display screen 42, an input / output interface 43, a communication interface 44, a power supply 45, and a communication bus 46.

[0117] Those skilled in the art can understand that Figure 5 the structure shown in

[0118] does not constitute a limitation on a radio frequency chip calibration device, and it may include more or fewer components than those shown in the figure.

[0119] Finally, the present application also provides an embodiment corresponding to a computer-readable storage medium. A computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps recorded in the above method embodiments are implemented.

[0120] It can be understood that if the methods in the above embodiments are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and executes all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs, etc., which can store program codes.

[0121] The above has introduced in detail a calibration waveform generator and a radio frequency chip calibration system, method, device, and medium provided by the present application. The embodiments in the specification are described in a progressive manner, and the key point of each embodiment is the difference from other embodiments. The same or similar parts among the embodiments can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part. It should be noted that for those of ordinary skill in the art in the technical field of the present application, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the present application.

[0122] It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

Claims

1. A calibration waveform generator, characterized in that, Comprising: Multiple digital oscillators, a signal adder, and a register; The output terminals of each of the digital oscillators are connected to the input terminals of the signal adder, and are used for generating multiple single-tone signals with the same amplitude; The register is connected to each of the digital oscillators, and is used for storing single-tone frequency interval information, frequency sweep step information, and frequency sweep speed information; wherein, the single-tone frequency interval information is used for generating multiple uniformly spaced single-tone signals; the frequency sweep step information is used for determining the step of each multi-tone frequency sweep operation; the frequency sweep speed information is used for determining the interval of each multi-tone frequency sweep operation; The signal adder is used for adding multiple single-tone signals with the same amplitude to obtain a multi-tone signal, so as to implement I / Q mismatch calibration and DCOS calibration of a zero-IF radio frequency transceiver.

2. The calibration waveform generator according to claim 1, wherein Further comprising: A broadband modulation signal generation module; The broadband modulation signal generation module is used for generating a broadband modulation signal, so as to implement filter calibration of the zero-IF radio frequency transceiver; Wherein, the bandwidth of the broadband modulation signal covers the sideband rejection bandwidth of the filter in the zero-IF radio frequency transceiver.

3. The calibration waveform generator according to claim 2, wherein The broadband modulation signal generation module includes: a pseudo-random number sequence generation module and a signal modulation module; The pseudo-random number sequence generation module is connected to the signal modulation module; The pseudo-random number sequence generation module is used for generating a pseudo-random number sequence; The signal modulation module is used for modulating the received pseudo-random number sequence into the broadband modulation signal.

4. The calibration waveform generator according to claim 3, wherein The pseudo-random number sequence generation module is a pseudo-random binary sequence generation module; Correspondingly, the broadband modulation signal is a binary phase shift keying signal.

5. A radio frequency chip calibration system, characterized in that Comprising: The calibration waveform generator, a radio frequency chip, and a spectrum analyzer as described in claim 1; Wherein, the calibration waveform generator is connected to the transmit-side baseband channel and the transmit-side and receive-side coupling channels of the radio frequency chip; The spectrum analyzer is connected to the radio frequency output terminal of the radio frequency chip.

6. A radio frequency chip calibration method, characterized in that, Applied to the radio frequency chip calibration system as described in claim 5, comprising: Generating a multi-tone signal obtained by adding multiple uniformly spaced and same-amplitude single-tone signals according to pre-configured single-tone frequency interval information to perform multi-tone frequency sweeping; and observing the radio frequency output terminal of the radio frequency chip after each multi-tone frequency sweeping to obtain local oscillator leakage data and I / Q mismatch mirror data; wherein, the step of each multi-tone frequency sweeping operation is determined according to pre-configured frequency sweep step information, and the interval of each multi-tone frequency sweeping operation is determined according to pre-configured frequency sweep speed information; Performing DCOS calibration of the radio frequency chip according to the local oscillator leakage data obtained by performing multi-tone frequency sweeping multiple times; Performing I / Q mismatch calibration of the radio frequency chip according to the I / Q mismatch mirror data obtained by performing multi-tone frequency sweeping multiple times.

7. The radio frequency chip calibration method according to claim 6, characterized in that, The calibration waveform generator further includes: a broadband modulation signal generation module; the broadband modulation signal generation module is used for generating a broadband modulation signal, so as to implement filter calibration of a zero-IF radio frequency transceiver; wherein, the bandwidth of the broadband modulation signal covers the sideband rejection bandwidth of the filter in the zero-IF radio frequency transceiver; Correspondingly, before generating a multi-tone signal obtained by superimposing a plurality of uniformly spaced and same-amplitude single-tone signals according to pre-configured single-tone frequency interval information to perform multi-tone sweeping, the following steps are further included: Inputting the broadband modulation signal into the transmitting-end baseband channel and the transmitting-end and receiving-end coupling channels of the RF chip respectively; Realizing the filter calibration of the RF chip through the filter envelope observed at the RF output end.

8. A radio frequency chip calibration device, characterized in that, Applied to the RF chip calibration system as described in claim 5, including: A multi-tone sweeping module, configured to generate a multi-tone signal obtained by superimposing a plurality of uniformly spaced and same-amplitude single-tone signals according to pre-configured single-tone frequency interval information to perform multi-tone sweeping; and observing the RF output end of the RF chip after each multi-tone sweeping to obtain local oscillator leakage data and I / Q mismatch mirror data; wherein, the step of each multi-tone sweeping action is determined according to pre-configured sweeping step information, and the interval of each multi-tone sweeping action is determined according to pre-configured sweeping speed information; A DCOS calibration module, configured to perform DCOS calibration of the RF chip according to the local oscillator leakage data obtained by performing multi-tone sweeping multiple times; An I / Q mismatch calibration module, configured to perform I / Q mismatch calibration of the RF chip according to the I / Q mismatch mirror data obtained by performing multi-tone sweeping multiple times.

9. A radio frequency chip calibration device, characterized in that, Including: A memory, configured to store a calibration configuration program; A processor, configured to implement the steps of the RF chip calibration method as described in claim 6 or 7 when executing the calibration configuration program.

10. A computer-readable storage medium, characterized in that, A computer program is stored on the computer-readable storage medium, and when the computer program is executed by the processor, the steps of the RF chip calibration method as described in claim 6 or 7 are implemented.

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