Local oscillator leakage calibration device, method and signal transmitter

Abstract

The application discloses a local oscillator leakage calibration device, method and signal transmitter, wherein the local oscillator leakage calibration device comprises a transmitting module, a feedback module and an adjustment control module, wherein the transmitting module is used for converting a baseband digital signal into an analog signal, mixing the analog signal with a first local oscillator signal and generating a radio frequency signal; the feedback module is used for generating a feedback signal according to the radio frequency signal; and the adjustment control module is used for comparing the feedback signal with a first reference signal generated based on the baseband digital signal, and outputting a first adjustment signal to the transmitting module according to the comparison result, the first adjustment signal being used for adjusting the first local oscillator signal to eliminate local oscillator leakage. By comparing the feedback signal with the first reference signal, the first local oscillator signal of the transmitting module is adjusted to eliminate local oscillator leakage, the overhead of a feedback link can be reduced, and local oscillator leakage can be calibrated in real time.

Description

Technical Field

[0001] The embodiments of the present invention relate to, but are not limited to, the field of communications, and in particular to a local oscillator leakage calibration device, method, and signal transmitter. Background Art

[0002] Local oscillator leakage suppression is a fundamental performance indicator in wireless communication systems. Traditional wireless transmitters or receivers place the local oscillator (LO) outside the signal band through superheterodyne or low-IF structures, suppressing it with analog filters. However, with the development of 4G and 5G communication technologies, signal bandwidths are becoming wider, device integration is increasing, and signal power consumption is decreasing. The disadvantages of superheterodyne and low-IF structures compared to direct frequency conversion structures are becoming increasingly apparent. However, the local oscillator leakage of direct frequency conversion structures is in-band, requiring suppression of LO leakage in the RF signal to significantly impact system performance. Existing methods for suppressing LO leakage in RF signals primarily use a complete feedback link as the detection unit. The LO leakage value is then detected in the digital domain, and the LO suppression is achieved by adjusting the transmitting digital or analog link. However, this method has high resource overhead and cannot track the signal's LO leakage in real time when signals are multiplexed. Summary of the Invention

[0003] The main purpose of the embodiments of the present invention is to provide a local oscillator leakage calibration device, method and signal transmitter, which can reduce the overhead of the feedback link and calibrate the local oscillator leakage in real time.

[0004] In a first aspect, an embodiment of the present invention provides a local oscillator leakage calibration device, comprising:

[0005] a transmitting module, configured to convert a baseband digital signal into an analog signal, and mix the analog signal with a first local oscillator signal to generate a radio frequency signal;

[0006] A feedback module, configured to generate a feedback signal according to the radio frequency signal;

[0007] An adjustment control module is used to compare the feedback signal with a first reference signal generated based on the baseband digital signal, and output a first adjustment signal to the transmitting module according to the comparison result, wherein the first adjustment signal is used to adjust the first local oscillator signal to eliminate local oscillator leakage.

[0008] In a second aspect, an embodiment of the present invention further provides a local oscillator leakage calibration method, which is applied to a local oscillator leakage calibration device, and the method includes:

[0009] Converting the baseband digital signal into an analog signal, and mixing the analog signal with a first local oscillator signal to generate a radio frequency signal;

[0010] generating a feedback signal according to the radio frequency signal;

[0011] The feedback signal is compared with a first reference signal generated based on the baseband digital signal, and a first adjustment signal for adjusting the first local oscillator signal to eliminate local oscillator leakage is output according to a result of the comparison.

[0012] In a third aspect, an embodiment of the present invention further provides a signal transmitter, comprising the local oscillator leakage calibration device of the first aspect.

[0013] A fourth aspect includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program implements the local oscillator leakage calibration method of the second aspect when executed by the processor.

[0014] In a fifth aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which an information processing program is stored. When the information processing program is executed by a processor, the local oscillator leakage calibration method of the second aspect is implemented.

[0015] An embodiment of the present invention proposes a local oscillator leakage calibration device, method and signal transmitter, wherein the local oscillator leakage calibration device includes: a transmitting module, a feedback module and an adjustment control module, wherein the transmitting module is used to convert a baseband digital signal into an analog signal, and mix the analog signal with a first local oscillator signal to generate a radio frequency signal; the feedback module is used to generate a feedback signal based on the radio frequency signal; the adjustment control module is used to compare the feedback signal with a first reference signal generated based on the baseband digital signal, and output a first adjustment signal to the transmitting module based on the comparison result, the first adjustment signal is used to adjust the first local oscillator signal to eliminate local oscillator leakage; by comparing the feedback signal with the first reference signal and adjusting the first local oscillator signal of the transmitting module to eliminate local oscillator leakage, the overhead of the feedback link can be reduced and the local oscillator leakage can be calibrated in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a local oscillator leakage calibration device provided by one embodiment of the present invention;

[0017] Figure 2 is a schematic diagram of a local oscillator leakage calibration device provided by another embodiment of the present invention;

[0018] Figure 3 is a schematic diagram of a local oscillator leakage calibration device provided by another embodiment of the present invention;

[0019] Figure 4 is a schematic diagram of a parallel combination of an analog comparison unit and a digital control unit in a local oscillator leakage calibration device provided by another embodiment of the present invention;

[0020] Figure 5 is a schematic diagram of a series combination of an analog comparison unit and a digital control unit in a local oscillator leakage calibration device provided by another embodiment of the present invention;

[0021] Figure 6 is a schematic diagram of a local oscillator leakage calibration device provided by another embodiment of the present invention;

[0022] Figure 7 is a schematic diagram of a local oscillator leakage calibration device provided by another embodiment of the present invention;

[0023] Figure 8 is a schematic diagram of a local oscillator leakage calibration device provided by another embodiment of the present invention;

[0024] Figure 9 is a flow chart of a local oscillator leakage calibration method provided by one embodiment of the present invention;

[0025] Figure 10 is a flow chart of local oscillator leakage calibration in a local oscillator leakage calibration method provided by one embodiment of the present invention;

[0026] Figure 11 This is a flow chart of DC leakage calibration in a local oscillator leakage calibration method provided by one embodiment of the present invention;

[0027] Figure 12 This is a flow chart of power comparison calibration in a local oscillator leakage calibration method provided by one embodiment of the present invention;

[0028] Figure 13 1 is a waveform diagram of a power comparison process in a local oscillator leakage calibration method provided by an embodiment of the present invention;

[0029] Figure 14 This is a flowchart of generating a first reference signal in a local oscillator leakage calibration method provided by one embodiment of the present invention;

[0030] Figure 15 is a flow chart of a local oscillator leakage calibration method provided by another embodiment of the present invention;

[0031] Figure 16 is a waveform diagram of a baseband digital signal in a local oscillator leakage calibration method provided by another embodiment of the present invention;

[0032] Figure 17 is a waveform diagram of a radio frequency signal in a local oscillator leakage calibration method provided by another embodiment of the present invention;

[0033] Figure 18 is a waveform diagram of a mixing signal of a local oscillator leakage calibration method provided by another embodiment of the present invention;

[0034] Figure 19 1 is a waveform diagram of a feedback signal sampled at a second clock in a local oscillator leakage calibration method provided by another embodiment of the present invention;

[0035] Figure 20 1 is a waveform diagram of a feedback signal sampled at a first clock in a local oscillator leakage calibration method provided by another embodiment of the present invention;

[0036] Figure 21 is a schematic diagram of a signal transmitter provided by one embodiment of the present invention;

[0037] Figure 22 is a schematic diagram of a signal transmitter provided by another embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] It should be noted that although the functional modules are divided in the device schematic and the logical order is shown in the flowchart, in some cases, the steps shown or described can be performed in a different order than the module division in the device or the order in the flowchart.

[0040] This embodiment provides a local oscillator leakage calibration device, method and signal transmitter, wherein the local oscillator leakage calibration device includes: a transmitting module, a feedback module and an adjustment control module, wherein the transmitting module is used to convert a baseband digital signal into an analog signal, and mix the analog signal with a first local oscillator signal to generate a radio frequency signal; the feedback module is used to generate a feedback signal based on the radio frequency signal; the adjustment control module is used to compare the feedback signal with a first reference signal generated based on the baseband digital signal, and output a first adjustment signal to the transmitting module based on the comparison result, the first adjustment signal is used to adjust the first local oscillator signal to eliminate local oscillator leakage; by comparing the feedback signal with the first reference signal and adjusting the first local oscillator signal of the transmitting module to eliminate local oscillator leakage, the overhead of the feedback link can be reduced and the local oscillator leakage can be calibrated in real time.

[0041] The embodiments of the present invention are further described below with reference to the accompanying drawings.

[0042] like Figure 1 As shown, Figure 1The present invention is a schematic diagram of a local oscillator leakage calibration device in an embodiment, which may include: a transmitting module 110, a feedback module 120 and an adjustment control module 130, wherein the transmitting module 110 is used to convert a baseband digital signal S1 into an analog signal, and mix the analog signal with a first local oscillator signal to generate a radio frequency signal S2; the feedback module 120 is used to generate a feedback signal S3 according to the radio frequency signal S2; the adjustment control module 130 is used to compare the feedback signal S3 with a first reference signal generated based on the baseband digital signal S1, and output a first adjustment signal C1 to the transmitting module 110 according to the comparison result, wherein the first adjustment signal C1 is used to adjust the first local oscillator signal to eliminate local oscillator leakage; by comparing the feedback signal S3 with the first reference signal and adjusting the first local oscillator signal of the transmitting module 110 to eliminate local oscillator leakage, the overhead of the feedback link can be reduced and the local oscillator leakage can be calibrated in real time.

[0043] In one embodiment, the transmitting module 110 can convert the baseband digital signal S1 into an analog signal, mix the analog signal with a first local oscillator signal to generate a radio frequency signal S2, and then output the radio frequency signal S2 to the feedback module 120. The feedback module 120 can generate a feedback signal S3 based on the radio frequency signal S2 and output the feedback signal S3 to the adjustment control module 130. The adjustment control module 130 can compare the feedback signal S3 with a first reference signal generated based on the baseband digital signal S1 and, based on the comparison result, output a first adjustment signal C1 to the transmitting module 110. The transmitting module 110 adjusts the first local oscillator signal based on the obtained first adjustment signal C1. By continuously looping the above process, the first local oscillator signal of the radio frequency signal S2 can be compensated and calibrated, and local oscillator leakage can be eliminated through continuous iteration, thereby reducing the overhead of the feedback link and calibrating local oscillator leakage in real time.

[0044] It should be noted that the transmitting module 110 may include a local oscillator compensation unit, a DAC unit and an orthogonal modulation unit, or may include a local oscillator compensation unit, a filtering unit, a DAC unit and an orthogonal modulation unit. This embodiment does not specifically limit the structure of the transmitting module 110.

[0045] It should be noted that the orthogonal modulation unit may be an IQ orthogonal modulation unit, an orthogonal frequency division multiplexing modulation unit, or an orthogonal amplitude modulation modulation unit, which is not specifically limited in this embodiment.

[0046] It should be noted that the feedback module 120 may include a frequency mixing unit, or may include a frequency mixing unit and a DC compensation unit. This embodiment does not specifically limit the structure of the feedback module 120.

[0047] It should be noted that the regulation control module 130 may include an analog comparison unit, a sampling processing unit and a digital control unit, or may include an analog comparison unit, a sampling processing unit, a power regulation unit and a digital control unit. This embodiment does not specifically limit the structure of the regulation control module 130.

[0048] It should be noted that the sampling processing unit may include a gain subunit, a DC separation subunit and a DAC subunit, or may be other structures, as long as they can convert the baseband digital signal S1 into the first reference signal.

[0049] Reference Figure 2 In one embodiment, the adjustment control module 130 may include a sampling processing unit 210, an analog comparison unit 220, and a digital control unit 230, wherein the sampling processing unit 210 is used to sample the baseband digital signal S1 and perform signal processing on the baseband digital signal S1 to generate a first reference signal R1; the analog comparison unit 220 is used to compare the first reference signal R1 with the feedback signal S3 to obtain a first comparison result CR1; and the digital control unit 230 is used to output a first adjustment signal C1 to the transmitting module 110 according to the first comparison result CR1.

[0050] In one embodiment, the regulation control module 130 can sample the baseband digital signal S1 through the sampling processing unit 210 and perform signal processing on the baseband digital signal S1 to generate a first reference signal R1, output the first reference signal R1 to the analog comparison unit 220, and then compare the first reference signal R1 with the feedback signal S3 generated by the feedback module 120 through the analog comparison unit 220 to obtain a first comparison result CR1. For example, if the voltage value of the feedback signal S3 is greater than the voltage value of the first reference signal R1, then the first comparison result CR1 output by the analog comparison unit 220 is 1, otherwise the first comparison result CR1 is -1. The digital control unit 230 can output a first adjustment signal C1 to the transmitting module 110 based on the first comparison result CR1. The transmitting module 110 adjusts the first local oscillator signal F1 based on the acquired first adjustment signal C1. For example, the digital control unit 230 can accumulate the first comparison results CR1 acquired multiple times. When the accumulated count value is greater than 0, the first adjustment signal C1 can be used to increase the compensation for the local oscillator leakage of the transmitting module 110. Conversely, the first adjustment signal C1 can be used to reduce the compensation for the local oscillator leakage of the transmitting module 110. By continuously looping the above process, the first local oscillator signal F1 of the RF signal S2 is compensated and calibrated, and local oscillator leakage is eliminated through continuous iteration. This can reduce the overhead of the feedback link and calibrate the local oscillator leakage in real time.

[0051] Reference Figure 3In one embodiment, based on the above Figure 2 In an embodiment, the analog comparison unit 220 can also be used to compare the feedback signal S3 with a preset second reference signal R2 and output a second comparison result CR2; the digital control unit 230 is further used to output a second adjustment signal C2 according to the second comparison result CR2; the feedback module 120 may include a mixing unit 310 and a DC compensation unit 320, the mixing unit 310 is used to mix the RF signal S2 with the second local oscillation signal F2 and output a mixed signal S23; the DC compensation unit 320 is used to perform DC compensation on the mixed signal S23 according to the second adjustment signal C2 and output a feedback signal S3.

[0052] In one embodiment, the feedback module 120 may mix the RF signal S2 with the second local oscillator signal F2 via the mixing unit 310 to generate a mixed signal S23, and output the mixed signal S23 to the DC compensation unit 320. The DC compensation unit 320 may generate a feedback signal S3 based on the mixed signal S23, and output the feedback signal S3 to the analog comparison unit 220. The analog comparison unit 220 may compare the feedback signal S3 with a predetermined second reference signal R2 to generate a second comparison result CR2. For example, if the voltage value of the feedback signal S3 is greater than the voltage value of the second reference signal R2, the analog comparison unit 220 outputs the second comparison result CR2 as 1; otherwise, the second comparison result CR2 is -1. The second comparison result CR2 is then output to the digital control unit 230. The digital control unit 230 may output a second adjustment signal C2 based on the second comparison result CR2, and the DC compensation unit 320 of the feedback module 120 may perform DC compensation on the mixed signal S23 based on the second adjustment signal C2. For example, the digital control unit 230 can accumulate the second comparison results CR2 collected multiple times. When the accumulated count value is greater than 0, the second adjustment signal C2 can be used to increase the DC compensation of the feedback module 120. Conversely, the second adjustment signal C2 can be used to reduce the DC compensation of the feedback module 120. The feedback signal S3 is generated and output to the analog comparison unit 220. By continuously repeating the above process, the feedback DC leakage generated by the mixing of the RF signal S2 and the second local oscillator signal F2 can be eliminated.

[0053] It should be noted that the mixing unit 310 can be a down-mixer, a single-channel mixer, or an IQ demodulator, and this embodiment does not specifically limit this. When the mixing unit 310 is a down-mixer, the RF signal S2 output by the transmitting module 110 is mixed with the second local oscillator signal F2, and the RF signal S2 can be shifted to a low intermediate frequency to obtain a low intermediate frequency mixing signal S23. The mixing signal S23 is output to the DC compensation unit 320, and the DC compensation unit 320 can generate the feedback signal S3.

[0054] It should be noted that there can be multiple combination implementations between the analog comparison unit 220 and the digital control unit 230. It can be two branches formed by connecting the analog comparison sub-unit and the digital control sub-unit in parallel, or it can be a selection analog comparison sub-unit provided with a selection sub-unit and a digital control sub-unit provided with a selection sub-unit connected in series. This embodiment does not make any specific restrictions on this.

[0055] Reference Figure 4 When the combination of the analog comparison unit 220 and the digital control unit 230 is implemented as two branches formed by connecting the analog comparison subunits and the digital control subunits in parallel, the analog comparison unit 220 includes a first analog comparison subunit 410 and a second analog comparison subunit 420 arranged in parallel with the first analog comparison subunit 410, and the digital control unit 230 includes a first digital control subunit 430 and a second digital control subunit 440, the first analog comparison subunit 410 is connected to the first digital control subunit 430, and the second analog comparison subunit 420 is connected to the second digital control subunit 440; the first analog comparison subunit 410 Used to compare the first reference signal R1 and the feedback signal S3 to obtain a first comparison result CR1; the first digital control subunit 430 is used to collect the first comparison result CR1 according to the first clock signal CLK1 and output the first adjustment signal C1 to the transmitting module 110 according to the first comparison result CR1; the second analog comparison subunit 420 is used to compare the feedback signal S3 with the preset second reference signal R2 and output the second comparison result CR2; the second digital control subunit 440 is used to collect the second comparison result CR2 according to the second clock signal CLK2 and output the second adjustment signal C2 according to the second comparison result CR2.

[0056] Reference Figure 5When the combination of the analog comparison unit 220 and the digital control unit 230 is implemented by connecting a selection analog comparison subunit provided with a selection subunit and a digital control subunit provided with a selection subunit in series, the analog comparison unit 220 includes a third analog comparison subunit 510 and a first selection subunit 520. The output end of the first selection subunit 520 is connected to the signal input end of the third analog comparison subunit 510. The third analog comparison subunit 510 is used to compare the first reference signal R1 with the feedback signal S3 to obtain a first comparison result CR1, and is also used to compare the feedback signal S3 with a preset second reference signal R2 and output a second comparison result CR2. The first selection subunit 520 is used to distribute and transmit the obtained first reference signal R1 and second reference signal R2 to the digital control unit 230 according to the comparison requirements of the digital control unit 230. The digital control unit 230 includes a digital counting subunit 530, a second selection subunit 540 and a third selection subunit. The digital counting subunit 530 is connected to the clock input terminal of the digital counting subunit 530, and the third selecting subunit 550 is connected to the signal output terminal of the digital counting subunit 530. The digital counting subunit 530 is used to output the first adjustment signal C1 to the transmitting module 110 according to the first comparison result CR1, and is also used to output the second adjustment signal C2 according to the second comparison result CR2. The second selecting subunit 540 is used to transmit the first clock signal CLK1 or the second clock signal CLK2 to the digital counting subunit 530 according to the comparison requirement of the digital counting subunit 530; the signal output terminal of the third analog comparing subunit 510 is connected to the signal input terminal of the digital counting subunit 530; the third selecting subunit 550 is connected to the transmitting module 110 and the feedback module 120 respectively. The third selecting subunit 550 outputs the first adjustment signal C1 to the transmitting module 110 or outputs the second adjustment signal C2 to the feedback module 120 according to the comparison requirement of the digital counting subunit 530.

[0057] It should be noted that the rate of the second clock signal CLK2 may be greater than the rate of the first clock signal CLK1 . The rate of the second clock signal CLK2 may be twice or more than twice the rate of the first clock signal CLK1 , which is not specifically limited in this embodiment.

[0058] Reference Figure 6 In one embodiment, based on the above embodiment, the regulation control module 130 further includes a power regulation unit 610. The power regulation unit 610 can be used to compare the feedback signal S3 with the baseband digital signal S1 to obtain a third comparison result CR3, and output a third adjustment signal C3 to the sampling processing unit 210 according to the third comparison result CR3, so that the sampling processing unit 210 performs signal processing on the baseband digital signal S1 so that the power of the baseband digital signal S1 is equal to the power of the feedback signal S3.

[0059] In one embodiment, the regulation control module 130 may compare the power of the feedback signal S3 with the power of the baseband digital signal S1 through the power regulation unit 610 to obtain a third comparison result CR3, and output a third adjustment signal C3 to the sampling processing unit 210 based on the third comparison result CR3. The sampling processing unit 210 may perform signal processing on the baseband digital signal S1 based on the third adjustment signal C3, and adjust the power of the baseband digital signal S1 so that the power of the baseband digital signal S1 is equal to the power of the feedback signal S3. This enables the first reference signal R1 generated by the sampling processing unit 210 to be more accurate, reduces the number of comparison cycles, and improves the efficiency of the regulation control module 130 in eliminating local oscillator leakage.

[0060] Reference Figure 7 In one embodiment, based on the above embodiment, the sampling processing unit 210 may include a gain subunit 710, a DC separation subunit 720, and a DAC subunit 730, wherein the gain subunit 710 is used to sample the baseband digital signal S1 and adjust the power of the sampled baseband digital signal S1 according to the third adjustment signal C3; the DC separation subunit 720 is used to extract the DC component of the power-adjusted baseband digital signal S1; and the DAC subunit 730 is used to convert the DC component of the baseband digital signal S1 into a first reference signal R1.

[0061] In one embodiment, the sampling and processing unit 210 can obtain a third adjustment signal C3, and then adjust the power of the baseband digital signal S1 according to the third adjustment signal C3 through the gain sub-unit 710, so that the power of the baseband digital signal S1 is equal to the power of the feedback signal S3. The DC component of the power-adjusted baseband digital signal S1 is extracted through the DC separation sub-unit 720 and output to the DAC sub-unit 730. The DAC sub-unit 730 converts the DC component of the baseband digital signal S1 into the first reference signal R1. The first reference signal R1 generated by the sampling and processing unit 210 is more accurate, the number of comparison cycles is reduced, and the efficiency of the regulation control module 130 in eliminating local oscillator leakage is improved.

[0062] Reference Figure 8In one embodiment, the local oscillator leakage calibration device may include: a transmitting module 110, a feedback module 120 and an adjustment control module 130. The transmitting module 110 may include a local oscillator compensation unit 810, a DAC unit 820, a filtering unit 830 and an orthogonal modulation unit 840 connected in sequence. The orthogonal modulation unit 840 may be an IQ orthogonal modulation unit 840. The feedback module 120 may include a mixing unit 310 and a DC compensation unit 320. The adjustment control module 130 may include a power adjustment unit 610, a sampling processing unit 210, an analog comparison unit 220 and a digital control unit 230. The sampling processing unit 210 may include a gain subunit 710, a DC separation subunit 720 and a DAC subunit 730 connected in sequence. The output end of the orthogonal modulation unit 840 is connected to the input end of the mixing unit 310, the input end of the DC compensation unit 320 is connected to the output end of the mixing unit 310, the output end of the DC compensation unit 320 is respectively connected to the first signal input end of the analog comparison unit 220 and the first signal input end of the power adjustment unit 610, the DAC subunit 730 is connected to the second signal input end of the analog comparison unit 220, the control end of the gain subunit 710 is connected to the output end of the power adjustment unit 610, the first signal output end and the second signal output end of the analog comparison unit 220 are respectively connected to the first signal input end and the second signal input end of the digital control unit 230, the first signal output end of the first digital control unit 230 is connected to the control end of the local oscillator compensation unit 810, and the second signal output end of the first digital control unit 230 is connected to the control end of the DC compensation unit 320.

[0063] The transmitter module 110 can be a direct conversion transmitter. The baseband digital signal S1 is converted into an analog signal S12 by the DAC unit 820. The analog signal S12 is filtered by the filter unit 830 and then enters the IQ quadrature modulation unit 840. It is quadrature mixed with the first local oscillator signal F1 to output the RF signal S2. If there is leakage of the first local oscillator signal F1, the RF signal S2 is a superposition of the valid RF signal S2 and the local oscillator leakage signal of the first local oscillator signal F1.

[0064] The RF signal S2 is output to the feedback module 120. The RF signal S2 is mixed with the second local oscillator signal F2 by the mixing unit 310 in the feedback module 120. This shifts the RF signal S2 to a low intermediate frequency (LIF) to generate a low-IF mixed signal S23. The mixed signal S23 then passes through the DC compensation unit 320 to generate the feedback signal S3. If there is leakage from the second local oscillator signal F2, the feedback signal S3 is superimposed with the effective RF signal S2, the local oscillator leakage signal of the first local oscillator signal F1, and the DC leakage signal of the first local oscillator signal F1.

[0065] Feedback signal S3 is output to the adjustment control module 130. The adjustment control module 130 transmits the input feedback signal S3 to the power adjustment unit 610 and the analog signal unit S12 for power comparison and signal cross-reference comparison. In the power adjustment unit 610, the feedback signal S3 is compared with the power of the baseband digital signal S1 to obtain a third comparison result CR3. The third adjustment signal C3 is output to the gain subunit 710 of the sampling processing unit 210 to adjust the power of the baseband digital signal S1 output to the sampling processing unit 210. When the detected power of the baseband digital signal S1 is greater than the power of the feedback signal S3, the gain subunit 710 can be controlled to reduce the power value of the baseband digital signal S1. When the detected power of the baseband digital signal S1 is less than the power of the feedback signal S3, the gain subunit 710 can be controlled to increase the power value of the baseband digital signal S1. The gain compensation is adjusted by the gain subunit 710, ultimately making the power of the baseband digital signal S1 in the sampling processing unit 210 equal to the power of the feedback signal S3.

[0066] After the power adjustment is completed, the baseband digital signal S1 passes through the DC separation sub-unit 720 to extract the DC component of the baseband digital signal S1, and the DC component of the baseband digital signal S1 is transmitted to the low-speed DAC sub-unit 730 to generate the first reference signal R1, and the first reference signal R1 is output to the second signal input terminal of the analog comparison unit 220.

[0067] In the analog comparison unit 220, the feedback signal S3 is compared with the first reference signal R1 and with a preset second reference signal R2 obtained from the third signal input terminal of the analog comparison unit 220 to obtain a first comparison result CR1 and a second comparison result CR2. The first comparison result CR1 and the second comparison result CR2 are respectively output to the digital control unit 230. The digital control unit 230 performs counting based on the first comparison result CR1 and the second comparison result CR2, and outputs the second adjustment signal C2 to the local oscillator compensation unit 810 and the third adjustment signal C3 to the DC compensation unit 320 based on the statistical results.

[0068] For example, in the analog comparison unit 220, the feedback signal S3 is compared with the second reference signal R2. If the voltage of the feedback signal S3 is greater than the second reference signal R2, the second comparison result CR2 can be output as 1. If the voltage of the feedback signal S3 is less than the second reference signal R2, the second comparison result CR2 can be output as -1. The second comparison result CR2 is output to the digital control unit 230. The digital control unit 230 can sample and accumulate the second comparison result CR2 according to the second clock signal CLK2, and output the second adjustment signal C2 to the DC compensation unit 320 according to the result of the accumulated counting. If the DC component of the feedback signal S3 is consistent with the second reference signal R2, the number of times the second comparison result CR2 is 1 is substantially equal to the second comparison result CR2. is -1, the accumulated count value of the second comparison result CR2 approaches 0, and at this time, there is no need to adjust the DC compensation unit 320; if the DC component of the feedback signal S3 is greater than the second reference signal R2, then the number of times the second comparison result CR2 is 1 is greater than the number of times the second comparison result CR2 is -1, and the accumulated count value of the second comparison result CR2 is greater than 0, and at this time, the DC compensation of the DC compensation unit 320 can be increased; conversely, the number of times the second comparison result CR2 is 1 is less than the number of times the second comparison result CR2 is -1, and the accumulated count value of the second comparison result CR2 is less than 0, and at this time, the DC compensation of the DC compensation unit 320 can be reduced; finally, the DC component of the feedback signal S3 is stabilized near the second reference signal R2, and the feedback DC calibration is completed.

[0069] Similarly, in the analog comparison unit 220, the feedback signal S3 is compared with the first reference signal R1. If the voltage of the feedback signal S3 is greater than the first reference signal R1, a first comparison result CR1 of 1 can be output. If the voltage of the feedback signal S3 is less than the first reference signal R1, a first comparison result CR1 of -1 can be output. The first comparison result CR1 is output to the digital control unit 230. The digital control unit 230 can sample and accumulate the first comparison result CR1 according to the first clock signal CLK1, and output the first adjustment signal C1 to the local oscillation compensation unit 810 based on the accumulated counting result. If the local oscillator leakage signal in the feedback signal S3 is eliminated, the difference between the number of times the first comparison result CR1 is 1 and the number of times the first comparison result CR1 is -1 is small, and the accumulated count value of the first comparison result CR1 approaches 0. In this case, there is no need to adjust the local oscillator compensation unit 810. If the accumulated count value of the first comparison result CR1 is greater than 0, the local oscillator compensation of the local oscillator compensation unit 810 can be increased. Conversely, if the accumulated count value of the first comparison result CR1 is less than 0, the local oscillator compensation of the local oscillator compensation unit 810 can be reduced. Ultimately, the local oscillator leakage in the feedback signal S3 is maintained near 0, and the feedback DC calibration is completed.

[0070] By continuously looping the process of the above embodiment, the local oscillator in the radio frequency signal can be compensated and calibrated, and continuous iteration and real-time tracking can be performed.

[0071] Reference Figure 9 The local oscillator leakage calibration method is applied to the local oscillator leakage calibration device in the above embodiment. In one embodiment, the local oscillator leakage calibration method includes but is not limited to the following steps:

[0072] Step S910, converting the baseband digital signal into an analog signal, and mixing the analog signal with a first local oscillator signal to generate a radio frequency signal;

[0073] Step S920: generating a feedback signal according to the radio frequency signal;

[0074] Step S930 : Compare the feedback signal with a first reference signal generated based on the baseband digital signal, and output a first adjustment signal for adjusting the first local oscillator signal to eliminate local oscillator leakage according to a comparison result.

[0075] In one embodiment, a transmitting module can convert a baseband digital signal into an analog signal, mix the analog signal with a first local oscillator signal to generate a radio frequency signal, and then output the radio frequency signal to a feedback module. The feedback module can generate a feedback signal based on the radio frequency signal and output the feedback signal to an adjustment control module. The adjustment control module can compare the feedback signal with a first reference signal generated based on the baseband digital signal and, based on the comparison result, output a first adjustment signal to the transmitting module. The transmitting module adjusts the first local oscillator signal based on the obtained first adjustment signal. This process can be repeated repeatedly to compensate and calibrate the first local oscillator signal of the radio frequency signal, and iteratively eliminate local oscillator leakage, thereby reducing feedback link overhead and calibrating local oscillator leakage in real time.

[0076] Reference Figure 10 In one embodiment, the regulation control module includes a sampling processing unit, an analog comparison unit, and a digital control unit. Step S930 includes but is not limited to the following steps:

[0077] Step S1010: sampling the baseband digital signal, and performing signal processing on the sampled baseband digital signal to generate a first reference signal;

[0078] Step S1020: Compare the first reference signal and the feedback signal to obtain a first comparison result;

[0079] Step S1030 : Outputting the first adjustment signal for adjusting the first local oscillator signal to eliminate local oscillator leakage according to the first comparison result.

[0080] In one embodiment, the adjustment control module can sample the baseband digital signal through the sampling and processing unit and perform signal processing on the baseband digital signal to generate a first reference signal. The first reference signal is then output to the analog comparison unit. The analog comparison unit then compares the first reference signal with the feedback signal generated by the feedback module to obtain a first comparison result. For example, if the voltage value of the feedback signal is greater than the voltage value of the first reference signal, the first comparison result output by the analog comparison unit is 1; otherwise, the first comparison result is -1. The digital control unit can output a first adjustment signal to the transmitter module based on the first comparison result. The transmitter module adjusts the first local oscillator signal based on the obtained first adjustment signal. For example, the digital control unit can accumulate the first comparison results collected multiple times. When the accumulated count value is greater than 0, the first adjustment signal can be used to increase the compensation for the local oscillator leakage of the transmitter module. Otherwise, the first adjustment signal can be used to reduce the compensation for the local oscillator leakage of the transmitter module. By continuously looping the above process, the first local oscillator signal of the RF signal is compensated and calibrated, and local oscillator leakage is eliminated through continuous iteration. This can reduce the overhead of the feedback link and calibrate the local oscillator leakage in real time.

[0081] Reference Figure 11 In one embodiment, the feedback module includes a frequency mixing unit and a DC compensation unit. The local oscillator leakage calibration method further includes but is not limited to the following steps:

[0082] Step S1110, comparing the feedback signal with a preset second reference signal, and outputting a second comparison result;

[0083] Step S1120, obtaining a second adjustment signal according to the second comparison result;

[0084] Step S1130, mixing the radio frequency signal with a second local oscillator signal to obtain a mixed signal;

[0085] Step S1140 , performing DC compensation on the mixed signal according to the second adjustment signal, and outputting a feedback signal.

[0086] In one embodiment, the feedback module can mix the RF signal with the second local oscillator signal via a frequency mixing unit to generate a mixed signal, which is then output to a DC compensation unit. The DC compensation unit can generate a feedback signal based on the mixed signal and output the feedback signal to an analog comparison unit. The analog comparison unit can compare the feedback signal with a preset second reference signal to generate a second comparison result. For example, if the voltage value of the feedback signal is greater than the voltage value of the second reference signal, the analog comparison unit outputs a second comparison result of 1; otherwise, the analog comparison unit outputs a second comparison result of -1. The second comparison result is then output to a digital control unit, which can output a second adjustment signal based on the second comparison result. The DC compensation unit of the feedback module can then perform DC compensation on the mixed signal based on the second adjustment signal. For example, the digital control unit can accumulate multiple acquired second comparison results. When the accumulated count value is greater than 0, the second adjustment signal can be used to increase the DC compensation of the feedback module; otherwise, the second adjustment signal can be used to decrease the DC compensation of the feedback module. The feedback signal is generated and output to the analog comparison unit. This process can be repeated repeatedly to eliminate feedback DC leakage generated when the RF signal is mixed with the second local oscillator signal.

[0087] Reference Figure 12 In one embodiment, the regulation control module further includes a power regulation unit, and the local oscillator leakage calibration method further includes but is not limited to the following steps:

[0088] Step S1210, comparing the feedback signal with the baseband digital signal to obtain a third comparison result;

[0089] Step S1220, obtaining a third adjustment signal according to the third comparison result;

[0090] Step S1230: performing signal processing on the sampled baseband digital signal according to the third adjustment signal, so that the power of the baseband digital signal is equal to the power of the feedback signal.

[0091] In one embodiment, the regulation control module may compare the power of the feedback signal with the power of the baseband digital signal through the power regulation unit to obtain a third comparison result, and output a third adjustment signal to the sampling processing unit according to the third comparison result. The sampling processing unit may perform signal processing on the baseband digital signal according to the third adjustment signal, and adjust the power of the baseband digital signal so that the power of the baseband digital signal and the power of the feedback signal reach a dynamic balance. The power adjustment process of this embodiment may be circulated to adjust the power of the baseband digital signal. The comparison process of the power of the baseband digital signal and the power of the feedback signal is as follows. Figure 13As shown, the first reference signal generated by the sampling processing unit can be made more accurate, the number of comparison cycles can be reduced, and the efficiency of the regulation control module in eliminating local oscillator leakage can be improved.

[0092] Reference Figure 14 In one embodiment, the sampling processing unit includes a gain subunit, a DC separation subunit, and a DAC subunit. The local oscillator leakage calibration method further includes but is not limited to the following steps:

[0093] Step S1410: sampling a baseband digital signal, and adjusting the power of the sampled baseband digital signal according to the third adjustment signal;

[0094] Step S1420, extracting a DC component of the baseband digital signal after power adjustment;

[0095] Step S1430: Convert the DC component of the baseband digital signal into the first reference signal.

[0096] In one embodiment, the sampling processing unit may sample the baseband digital signal and obtain a third adjustment signal. The gain sub-unit may then adjust the power of the baseband digital signal based on the third adjustment signal so that the power of the baseband digital signal is equal to the power of the feedback signal. The DC separation sub-unit extracts a DC component from the power-adjusted baseband digital signal and outputs the DC component to the DAC sub-unit. The DAC sub-unit then converts the DC component of the baseband digital signal into a first reference signal. The first reference signal generated by the sampling processing unit is more accurate, the number of comparison cycles is reduced, and the efficiency of the regulation control module in eliminating local oscillator leakage is improved.

[0097] Reference Figure 15 In one embodiment, the local oscillator leakage calibration method includes but is not limited to the following steps:

[0098] Step S1510, converting the baseband digital signal into an analog signal, mixing the analog signal with a first local oscillator signal, and outputting a radio frequency signal;

[0099] Step S1520, mixing the radio frequency signal with the second local oscillator signal, and outputting a mixed signal;

[0100] Step S1530, generating a feedback signal according to the mixing signal and outputting the feedback signal;

[0101] Step S1540, performing a power comparison between the feedback signal and the baseband digital signal, and outputting a third adjustment signal according to the power comparison result;

[0102] Step S1550, adjusting the baseband digital signal power according to the third adjustment signal;

[0103] Step S1560, extracting the DC component of the power-adjusted baseband digital signal;

[0104] Step S1570, converting the DC component of the baseband digital signal into a first reference signal;

[0105] Step S1580, comparing the feedback signal with a preset second reference signal, and outputting a second comparison result;

[0106] Step S1590, outputting a second adjustment signal according to the second comparison result;

[0107] Step S1600, performing DC compensation on the mixed signal according to the second adjustment signal, and outputting a feedback signal;

[0108] Step S1610, comparing the first reference signal and the feedback signal, and generating a first comparison signal according to the comparison result;

[0109] Step S1620, sampling the first comparison signal and outputting a first adjustment signal to the transmitting module according to the sampling result;

[0110] Step S1630: Adjust the first local oscillator signal according to the first adjustment signal to eliminate local oscillator leakage.

[0111] In one embodiment, a baseband digital signal is converted into an analog signal by a transmitting module, and the analog signal is orthogonally mixed with a first local oscillator signal to generate a radio frequency signal, which is output to a feedback module; then, the radio frequency signal is mixed with a second local oscillator signal by a mixing unit of the feedback module to generate a mixed signal, and the mixed signal is output to a DC compensation unit, and a feedback signal is generated according to the mixed signal by the DC compensation unit, and the feedback signal is respectively output to a power adjustment unit and an analog comparison unit of an adjustment control module; a comparison and adjustment process of the feedback signal is entered, first, the power adjustment unit of the adjustment control module compares the power of the feedback signal with the baseband digital signal, and outputs a third adjustment signal to a gain subunit of the sampling processing unit according to the power comparison result, and the gain subunit adjusts the power of the baseband digital signal according to the third adjustment signal, and then the DC separation subunit extracts the DC power of the power-adjusted baseband digital signal. The DAC subunit converts the DC component of the baseband digital signal into a first reference signal, which is used for comparison with the feedback signal. While comparing and adjusting the power of the baseband digital signal, the analog comparison unit compares the feedback signal with a preset second reference signal and outputs a second comparison result. The digital control unit outputs a second adjustment signal based on the second comparison result. The DC compensation unit performs DC compensation on the mixed signal based on the second adjustment signal and outputs a feedback signal that has completed DC calibration. At this point, the analog comparison unit compares the first reference signal with the feedback signal and generates a first comparison signal based on the comparison result. The digital control unit samples the first comparison signal and outputs a first adjustment signal to the transmitter module based on the sampling result. The local oscillator compensation unit adjusts the first local oscillator signal based on the first adjustment signal to eliminate local oscillator leakage. By comparing the feedback signal with two reference signals (the first reference signal and the second reference signal) through the analog comparison unit, DC calibration and local oscillator leakage calibration are performed on the feedback signal, reducing the overhead of the feedback link and enabling real-time calibration of local oscillator leakage.

[0112] Reference Figures 16 to 20 In one embodiment, the frequency domain variation of the baseband digital signal is further described. In one embodiment, the transmitting module transmits the signal as follows: Figure 16 The baseband digital signal shown is converted into an analog signal, and the analog signal is orthogonally mixed with the first local oscillator signal. Due to the existence of local oscillator leakage, the orthogonal mixing will generate the following Figure 17 The RF signal shown contains the signal and the local oscillator leakage, and a part of the RF signal is coupled to the feedback module through the transmitting module; then the RF signal is mixed with the second local oscillator signal by the mixing unit of the feedback module to generate Figure 18The mixed signal shown in FIG is output to the DC compensation unit, and the DC compensation unit generates a feedback signal according to the mixed signal. It should be noted that before the DC compensation is performed on the feedback signal, the waveform of the feedback signal is consistent with that of the mixed signal, as shown in FIG. Figure 18 The intermediate frequency analog signal. Then the feedback signal is output to the power adjustment unit and analog comparison unit of the adjustment control module respectively, and enters the comparison and adjustment process of the feedback signal. First, as Figure 19 As shown, the feedback signal can be sampled by the analog comparison unit and the digital control unit under the second clock signal, the RF signal and the local oscillator leakage in the sampled feedback signal are biased on one side, and the DC leakage generated by the feedback module falls on the zero frequency. The sampled feedback signal can be compared with the preset second reference signal, and a second comparison result can be output, wherein the second comparison result can obtain the size of the feedback DC, and the digital control unit can generate a second adjustment signal according to the second comparison result, and then the DC compensation unit can perform DC compensation on the mixing signal according to the second adjustment signal, and output a feedback signal that has completed the feedback DC calibration; at this time, as shown in FIG. Figure 20 As shown, the feedback signal that has completed feedback DC calibration can be sampled by the analog comparison unit and the digital control unit under the first clock signal. The analog comparison unit can compare the first reference signal with the feedback signal that has completed feedback DC calibration, and generate a first comparison signal based on the comparison result. The digital control unit generates a first adjustment signal based on the first comparison signal and outputs it to the transmitting module. The local oscillator compensation unit adjusts the first local oscillator signal based on the first adjustment signal to eliminate local oscillator leakage. By comparing the feedback signal with two reference signals (the first reference signal and the second reference signal) by the analog comparison unit, DC calibration and local oscillator leakage calibration are performed on the feedback signal, which can reduce the overhead of the feedback link and achieve real-time calibration of local oscillator leakage.

[0113] like Figure 21 As shown, Figure 21 This is a schematic diagram of a signal transmitter, in which the signal transmitter 2100 includes a local oscillator leakage calibration device 2110. The local oscillator leakage calibration device 2110 may include: a transmitting module, a feedback module, and an adjustment control module, wherein the transmitting module is used to convert a baseband digital signal into an analog signal, and mix the analog signal with a first local oscillator signal to generate a radio frequency signal; the feedback module is used to generate a feedback signal based on the radio frequency signal; the adjustment control module is used to compare the feedback signal with a first reference signal generated based on the baseband digital signal, and output a first adjustment signal to the transmitting module based on the comparison result, wherein the first adjustment signal is used to adjust the first local oscillator signal to eliminate local oscillator leakage; by comparing the feedback signal with the first reference signal and adjusting the first local oscillator signal of the transmitting module to eliminate local oscillator leakage, the overhead of the feedback link can be reduced, and the local oscillator leakage can be calibrated in real time.

[0114] Another embodiment of the present invention further provides a signal transmitter, referring to Figure 22 Signal transmitter 2200 includes a memory 2220, a processor 2210, and a computer program stored in memory 2220 and executable on processor 2210. When executed by processor 2210, the computer program implements any of the aforementioned local oscillator leakage calibration methods. A transmitting module can convert a baseband digital signal into an analog signal, mix the analog signal with a first local oscillator signal to generate a radio frequency signal, and then output the radio frequency signal to a feedback module. The feedback module can generate a feedback signal based on the radio frequency signal and output the feedback signal to an adjustment control module. The adjustment control module can compare the feedback signal with a first reference signal generated based on the baseband digital signal and, based on the comparison result, output a first adjustment signal to the transmitting module. The transmitting module adjusts the first local oscillator signal based on the obtained first adjustment signal. By continuously looping through the above process, the first local oscillator signal of the radio frequency signal is compensated and calibrated, and local oscillator leakage is eliminated through continuous iteration. This can reduce feedback link overhead and calibrate local oscillator leakage in real time.

[0115] Another embodiment of the present invention further provides a computer-readable storage medium, which stores computer-executable instructions. The computer-executable instructions are executed by a processor or controller, for example, by a processor 2210 in the signal transmitter 2200 in the above embodiment, so that the processor 2210 can execute the local oscillator leakage calibration method in the above embodiment, for example, executing the above-described Figure 9 Steps S910 to S930 of the method, Figure 10 Steps S1010 to S1030 of the method, Figure 11 Steps S1110 to S1140 of the method, Figure 12 Method steps 1210 to S1230, Figure 14 In the method steps S1410 to S1430, Figure 15 Method steps S1510 to S1630 in.

[0116] Those skilled in the art will appreciate that all or some of the steps and systems in the method disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, and the computer-readable medium can include computer storage media (or non-transitory media) and communication media (or temporary media). As known to those skilled in the art, the term computer storage media is included in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data) and is volatile and non-volatile, removable, and non-removable. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory, or other memory technology, CD-ROM, digital versatile disks (DVD), or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage, or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, as is well known to those skilled in the art, communication media typically embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0117] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above implementation. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. A local oscillator leakage calibration device, comprising: a transmitting module, configured to convert a baseband digital signal into an analog signal, and mix the analog signal with a first local oscillator signal to generate a radio frequency signal; A feedback module, configured to generate a feedback signal according to the radio frequency signal; an adjustment control module, configured to compare the feedback signal with a first reference signal generated based on the baseband digital signal to obtain a first comparison result, and output a first adjustment signal to the transmitting module based on the first comparison result, wherein the first adjustment signal is used to adjust the first local oscillator signal to eliminate local oscillator leakage; The regulation control module includes: a sampling and processing unit, configured to sample a baseband digital signal and perform signal processing on the baseband digital signal to generate a first reference signal; an analog comparison unit, configured to compare the first reference signal and the feedback signal to obtain a first comparison result; A digital control unit is configured to output the first adjustment signal to the transmitting module according to the first comparison result.

2. The local oscillator leakage calibration device according to claim 1, characterized in that: The analog comparison unit is further configured to compare the feedback signal with a preset second reference signal and output a second comparison result; The digital control unit is further configured to output a second adjustment signal according to the second comparison result; The feedback module includes: a mixing unit, configured to mix the radio frequency signal with a second local oscillator signal and output a mixed signal; A DC compensation unit is configured to perform DC compensation on the mixing signal according to the second adjustment signal and output a feedback signal.

3. The local oscillator leakage calibration device according to claim 1, characterized in that: The regulation control module further includes: a power regulation unit, configured to compare the feedback signal with the baseband digital signal to obtain a third comparison result, and output a third adjustment signal to the sampling processing unit based on the third comparison result, so that the sampling processing unit performs signal processing on the baseband digital signal so that the power of the baseband digital signal is equal to the power of the feedback signal.

4. The local oscillator leakage calibration device according to claim 3, characterized in that: The sampling processing unit includes: a gain subunit, configured to sample the baseband digital signal and adjust the power of the sampled baseband digital signal according to the third adjustment signal; a DC separation subunit, configured to extract a DC component of the baseband digital signal after power adjustment; The DAC subunit is configured to convert the DC component of the baseband digital signal into the first reference signal.

5. The local oscillator leakage calibration device according to claim 2, characterized in that: The analog comparison unit includes a first analog comparison subunit and a second analog comparison subunit arranged in parallel with the first analog comparison subunit, and the digital control unit includes a first digital control subunit and a second digital control subunit, the first analog comparison subunit is connected to the first digital control subunit, and the second analog comparison subunit is connected to the second digital control subunit; The first analog comparison subunit is used to compare the first reference signal and the feedback signal to obtain the first comparison result; The first digital control subunit is configured to output the first adjustment signal to the transmitting module according to the first comparison result; The second analog comparison subunit is used to compare the feedback signal with a preset second reference signal and output a second comparison result; The second digital control subunit is configured to output the second adjustment signal according to the second comparison result.

6. The local oscillator leakage calibration device according to claim 2, characterized in that: The analog comparison unit includes a third analog comparison subunit and a first selection subunit, wherein the output end of the first selection subunit is connected to the signal input end of the third analog comparison subunit, the third analog comparison subunit is used to compare the first reference signal with the feedback signal to obtain the first comparison result, and is also used to compare the feedback signal with a preset second reference signal and output a second comparison result, and the first selection subunit is used to distribute and transmit the obtained first reference signal and second reference signal to the digital control unit according to the comparison requirement of the digital control unit; The digital control unit includes a digital counting subunit, a second selecting subunit, and a third selecting subunit, wherein the second selecting subunit is connected to a clock input terminal of the digital counting subunit, and the third selecting subunit is connected to a signal output terminal of the digital counting subunit. The digital counting subunit is configured to output the first adjustment signal to the transmitting module according to the first comparison result, and further configured to output the second adjustment signal according to the second comparison result. The second selecting subunit is configured to transmit the first clock signal or the second clock signal to the digital counting subunit according to a comparison requirement of the digital counting subunit. The signal output terminal of the third analog comparison subunit is connected to the signal input terminal of the digital counting subunit; The third selection subunit is connected to the transmission module and the feedback module respectively, and the third selection subunit outputs the first adjustment signal to the transmission module or outputs the second adjustment signal to the feedback module according to the comparison requirement of the digital counting subunit.

7. The local oscillator leakage calibration device according to claim 1, characterized in that: The transmitting module includes: A local oscillator compensation unit, configured to adjust the first local oscillator signal according to the first adjustment signal to eliminate local oscillator leakage; DAC unit, used to convert baseband digital signals into analog signals; The orthogonal modulation unit is used to mix the analog signal with a first local oscillator signal to generate a radio frequency signal.

8. A local oscillator leakage calibration method, applied to a local oscillator leakage calibration device, the method comprising: Converting the baseband digital signal into an analog signal, and mixing the analog signal with a first local oscillator signal to generate a radio frequency signal; generating a feedback signal according to the radio frequency signal; comparing the feedback signal with a first reference signal generated based on the baseband digital signal, and outputting a first adjustment signal for adjusting the first local oscillator signal to eliminate local oscillator leakage according to a result of the comparison; The step of comparing the feedback signal with a first reference signal generated based on the baseband digital signal, and outputting a first adjustment signal for adjusting the first local oscillator signal to eliminate local oscillator leakage according to a result of the comparison, includes: Sampling the baseband digital signal, and performing signal processing on the sampled baseband digital signal to generate a first reference signal; Comparing the first reference signal and the feedback signal to obtain a first comparison result; The first adjustment signal for adjusting the first local oscillation signal to eliminate local oscillation leakage is output according to the first comparison result.

9. The local oscillator leakage calibration method according to claim 8, characterized in that: Also includes: Comparing the feedback signal with a preset second reference signal and outputting a second comparison result; obtaining a second adjustment signal according to the second comparison result; Mixing the radio frequency signal with a second local oscillator signal to obtain a mixed signal; Perform direct current compensation on the mixing signal according to the second adjustment signal, and output a feedback signal.

10. The local oscillator leakage calibration method according to claim 8, characterized in that: Also includes: Comparing the feedback signal with the baseband digital signal to obtain a third comparison result; obtaining a third adjustment signal according to the third comparison result; Signal processing is performed on the sampled baseband digital signal according to the third adjustment signal, so that the power of the baseband digital signal is equal to the power of the feedback signal.

11. The local oscillator leakage calibration method according to claim 10, characterized in that: Before comparing the feedback signal with a first reference signal generated based on the baseband digital signal, the method further includes: Sampling the baseband digital signal, and adjusting the power of the sampled baseband digital signal according to the third adjustment signal; extracting a DC component of the power-adjusted baseband digital signal; The direct current component of the baseband digital signal is converted into the first reference signal.

12. A signal transmitter, comprising: A local oscillator leakage calibration device according to any one of claims 1 to 7.

13. A signal transmitter, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the local oscillator leakage calibration method according to any one of claims 8 to 11 is implemented. 14 . A computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the local oscillator leakage calibration method according to claim 8 .

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