Transmitter calibration device and calibration method

Abstract

This application discloses a transmitter calibration device and calibration method, relating to the field of integrated circuit technology. The device includes: a compensation module, a signal conversion module, a transceiver circuit module, a signal processing module, and a control module. The compensation module receives digital signals and is connected to the control module, and is also connected to the signal conversion module. The signal conversion module is connected to the transceiver circuit module, and is also connected to the signal processing module. The transceiver circuit module is connected to the control module. The signal processing module is also connected to the control module. The compensation module adjusts a compensation coefficient based on a first output signal from the control module to reduce the influence of the image power signal on the transmitted power signal. The transceiver circuit module adjusts a gain parameter based on a second output signal from the control module to reduce the influence of the mixing power signal on the transmitted power signal. This reduces the impact of the mixing signal on the image calibration effect of the calibration module, improving the overall calibration effect of the transmitter.

Description

Technical Field

[0001] This application relates to the field of integrated circuit technology, and in particular to a transmitter calibration device and calibration method. Background Technology

[0002] In existing direct-conversion transmitters, due to manufacturing deviations and parasitic parameters in the analog circuitry, there is a slight difference in gain between the I and Q paths. Furthermore, the phase difference between the signals supplied by the local oscillator to the I and Q mixers is not precisely 90 degrees, resulting in IQ mismatch. This mismatch generates a mirror frequency signal, causing spectrum contamination and significantly increasing the signal error vector amplitude. This leads to a spike in the bit error rate during demodulation, thus necessitating IQ calibration.

[0003] Traditional calibration methods suppress image frequency signals by adjusting compensation coefficients. However, in nanoscale high-precision integrated chips, the transmitter's output balun can interfere with nearby transmit phase-locked loops, generating new mixing interference signals. One of these mixing signals has the same frequency as the image signal. If this mixing interference signal is greater than or equal to the frequency of the image signal, it will affect the effectiveness of the image calibration algorithm and limit further improvement in the transmitter's spectral purity.

[0004] Therefore, how to reduce the mixing signal caused by the influence of the transmit output balun on the transmit phase-locked loop and improve the calibration effect of the transmitter is an urgent problem to be solved. Summary of the Invention

[0005] The main objective of this application is to provide a transmitter calibration device and calibration method, which aims to solve the technical problem of how to reduce the mixing signal caused by the influence of the transmit output balun on the transmit phase-locked loop and improve the calibration effect of the transmitter.

[0006] To achieve the above objectives, this application provides a transmitter calibration device, the transmitter calibration device comprising:

[0007] The system includes a compensation module, a signal conversion module, a transceiver circuit module, a signal processing module, and a control module. The first input terminal of the compensation module is used to receive digital signals, the second input terminal of the compensation module is connected to the output terminal of the control module, and the output terminal of the compensation module is connected to the first input terminal of the signal conversion module.

[0008] The second input terminal of the signal conversion module is connected to the output terminal of the transceiver circuit module, the first output terminal of the signal conversion module is connected to the first input terminal of the transceiver circuit module, and the second output terminal of the signal conversion module is connected to the input terminal of the signal processing module.

[0009] The second input terminal of the transceiver circuit module is connected to the output terminal of the control module;

[0010] The output of the signal processing module is connected to the input of the control module;

[0011] The compensation module is used to adjust the compensation coefficient according to the first output signal of the control module, and the first output signal is used to reduce the influence of the image power signal on the transmit power signal.

[0012] The transceiver circuit module is used to adjust the gain parameter according to the second output signal of the control module, and the second output signal is used to reduce the influence of the mixing power signal on the transmit power signal.

[0013] In one embodiment, the signal processing module includes:

[0014] The system includes a signal processing unit and a power detection unit. The input terminal of the signal processing unit is connected to the second output terminal of the signal conversion module, the output terminal of the signal processing unit is connected to the input terminal of the power detection unit, and the output terminal of the power detection unit is connected to the input terminal of the control module.

[0015] In one embodiment, the signal processing unit includes:

[0016] A digital quadrature mixer and a digital filter are provided. The input of the digital quadrature mixer is connected to the second output of the signal conversion module, the output of the digital quadrature mixer is connected to the input of the digital filter, and the output of the digital filter is connected to the input of the power detection unit.

[0017] The digital quadrature mixer is used to perform spectrum shifting processing on the digital signal output by the signal conversion module to obtain a digital signal shifted to near zero frequency.

[0018] The digital filter is used to filter and extract the digital signal that has been moved to the vicinity of zero frequency, thereby obtaining the corresponding zero-frequency signal.

[0019] In one embodiment, the transceiver circuit module includes:

[0020] The system includes a transmitting circuit unit and a receiving circuit unit. The first input terminal of the transmitting circuit unit is connected to the first output terminal of the signal conversion module. The second input terminal of the transmitting circuit unit is connected to the output terminal of the control module. The output terminal of the transmitting circuit unit is connected to the input terminal of the receiving circuit unit. The output terminal of the receiving circuit unit is connected to the second input terminal of the signal conversion module.

[0021] In one embodiment, the transmitting circuit unit includes:

[0022] The system includes a transmit intermediate frequency circuit, a transmit mixer, a transmit phase-locked loop, a transmit frequency divider circuit, a power preamplifier, and a balun. The input terminal of the transmit intermediate frequency circuit is connected to the first output terminal of the signal conversion module, and the output terminal of the transmit intermediate frequency circuit is connected to the first input terminal of the transmit mixer.

[0023] The second input terminal of the transmitter mixer is connected to the output terminal of the transmitter divider circuit, and the output terminal of the transmitter mixer is connected to the first input terminal of the power preamplifier.

[0024] The input terminal of the transmit phase-locked loop is connected to the output terminal of the control module, and the output terminal of the transmit phase-locked loop is connected to the input terminal of the transmit frequency divider circuit.

[0025] The second input terminal of the power preamplifier is connected to the output terminal of the control module, and the output terminal of the power preamplifier is connected to the input terminal of the balun, which is used to output the transmission signal.

[0026] In one embodiment, the transmitter calibration device further includes:

[0027] A switching module is provided on the connection line between the transmitting circuit unit and the receiving circuit unit. The switching module is controlled by the control module. The switching module is used to form a loop between the transmitting circuit unit and the receiving circuit unit so that the transmitting phase-locked loop is in a locked state.

[0028] Furthermore, to achieve the above objectives, this application also provides a transmitter calibration method, the transmitter calibration method comprising:

[0029] A calibration signal is generated and processed to obtain a processed digital signal.

[0030] Based on the digital signal, frequency shifting and filtering are performed by the signal processing module to obtain the transmit power signal, the mixing power signal and the image power signal;

[0031] Based on the transmit power signal, the mixing power signal, and the image power signal, a step-by-step calibration is performed to reduce the mixing power signal and the image power signal.

[0032] In one embodiment, before generating and processing the calibration signal, the method further includes:

[0033] The switching module is controlled to form a loop between the transmitting circuit unit and the receiving circuit module, ensuring that the transmitting phase-locked loop is in a locked state.

[0034] In one embodiment, the step of performing frequency shift filtering processing on the digital signal through the signal processing module to obtain the transmit power signal, the mixing power signal, and the image power signal specifically includes:

[0035] The processed digital signal is subjected to spectrum shifting to obtain a down-converted transmission signal near zero frequency, a down-converted mixing signal near zero frequency, and an up-converted mirror signal near zero frequency.

[0036] The transmitted signal down-converted to near zero frequency, the mixed signal down-converted to near zero frequency, and the mirror signal up-converted to near zero frequency are filtered to obtain the transmitted signal, the mixed signal, and the mirror signal.

[0037] The power of the transmitted signal, the mixed signal, and the mirror signal are detected to obtain the transmitted power signal, the mixed power signal, and the mirror power signal.

[0038] In one embodiment, the step-by-step calibration based on the transmit power signal, the mixing power signal, and the image power signal, thereby reducing the mixing power signal and the image power signal, specifically includes:

[0039] The control module acquires the transmit power signal, the mixing power signal, and the mirror power signal, adjusts the current value of the voltage-controlled oscillator of the transmit phase-locked loop, and selects the current value with the smallest ratio of the mixing power signal to the transmit power signal when the transmit phase-locked loop is in a locked state.

[0040] The gain of the power preamplifier and the gain of the receiving intermediate frequency circuit of the receiving circuit unit are adjusted. Under the condition that the sum of the gain of the power preamplifier and the gain of the receiving intermediate frequency circuit of the receiving circuit unit is a fixed value, the gain of the power preamplifier and the gain of the receiving intermediate frequency circuit of the receiving circuit unit are selected to minimize the ratio of the mixed power signal to the transmitted power signal.

[0041] The compensation coefficient of the compensation module is adjusted, and the compensation coefficient with the smallest ratio of the image power signal to the transmitted power signal is selected.

[0042] This application provides a transmitter calibration device, which includes a compensation module, a signal conversion module, a transceiver circuit module, a signal processing module, and a control module. The compensation module processes the received digital signal and outputs it to the signal conversion module. The signal conversion module converts the processed digital signal into an analog signal and outputs it to the transceiver circuit module. The transceiver circuit module performs frequency conversion processing on the analog signal and outputs it to the signal conversion module. The signal conversion module then converts the analog signal back into a digital signal and outputs it to the signal processing module. The signal processing module performs frequency shifting and filtering processing on the received digital signal and detects the power of the digital signal to obtain a transmit power signal, a mixed power signal, and a mirror power signal. These three signals are output to the control module. Based on the three received signals, the control module first adjusts the gain of the transceiver circuit module to reduce the influence of the mixed power signal on the transmit power signal. Then, based on the received transmit power signal, mixed power signal, and mirror power signal after gain adjustment, the control module adjusts the compensation coefficient of the compensation module to reduce the influence of the mirror power signal on the transmit power signal. By adjusting the gain of the transceiver circuit module through the control module, the mixing power signal is reduced, thereby reducing the impact of the mixing signal on the mirror calibration effect of the calibration module, and thus significantly improving the overall calibration effect of the transmitter. Attached Figure Description

[0043] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0044] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of the module connections of the transmitter calibration device in one embodiment of this application;

[0046] Figure 2 This is a schematic diagram of a signal processing module in one embodiment of this application;

[0047] Figure 3 This is a circuit diagram of a transmitter calibration device in one embodiment of this application;

[0048] Figure 4 This is a schematic diagram illustrating the spectrum shifting effect in one embodiment of this application;

[0049] Figure 5 This is a schematic diagram of a transceiver circuit module in one embodiment of this application;

[0050] Figure 6 This is a schematic diagram of the transmit output spectrum composition before calibration in one embodiment of this application;

[0051] Figure 7 This is a schematic diagram of the transmit output spectrum components with only mirror calibration performed in one embodiment of this application;

[0052] Figure 8 This is a schematic diagram of the transmit output spectrum components after all calibrations are completed in one embodiment of this application;

[0053] Figure 9 This is a flowchart of a transmitter calibration method in one embodiment of this application;

[0054] Figure 10 This is a flowchart illustrating frequency shift filtering processing performed by a signal processing module in one embodiment of this application;

[0055] Figure 11 This is a flowchart illustrating the step-by-step calibration process in one embodiment of this application.

[0056] Icon labels:

[0057] 1. Compensation Module; 2. Signal Conversion Module; 3. Transceiver Circuit Module; 31. Transmitting Circuit Unit; 311. Transmitting Intermediate Frequency Circuit; 32. Receiving Circuit Unit; 321. Receiving Intermediate Frequency Circuit; 4. Signal Processing Module; 41. Signal Processing Unit; 411. Digital Quadrature Mixer; 412. Digital Filter; 42. Power Detection Unit; 5. Control Module; 6. Signal Generator; 7. Switching Module;

[0058] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0059] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0060] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0061] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0062] Modern radio frequency (RF) chips commonly employ a direct conversion architecture (zero intermediate frequency architecture). The core idea is to use a signal with the exact same local oscillator frequency to directly down-convert the RF signal to baseband in a single step. Ideally, in a direct conversion transmitter, the gains of the I and Q paths are perfectly identical, and the two signals supplied by the local oscillator to the I and Q mixers are strictly 90 degrees out of phase. However, in reality, due to manufacturing deviations and parasitic parameters in analog circuits, there are slight differences in the amplifier gains of the I and Q paths, and the phase difference between the local oscillator signals of the I and Q paths is not precisely 90 degrees. These two mismatches are called IQ mismatch, which directly leads to quadrature modulation and demodulation distortion, causing devastating damage to system performance.

[0063] In the transmitter, I / Q mismatch causes the modulated RF signal to produce mirror frequency components, which not only pollutes the spectrum but may also interfere with other channels or other equipment, failing the spectrum transmission template test of the communication protocol. It also causes the constellation diagram to become distorted (from a square to a parallelogram) rather than a simple translation. This significantly increases the signal error vector amplitude, causing the bit error rate to spike during demodulation. Therefore, calibration is necessary to compensate for the gain and phase differences between the I and Q paths and restore their orthogonality.

[0064] Because the power preamplifier of the transmit channel has a very high output power, typically greater than 5dBm, the on-chip differential-to-single-ended balun will affect the transmit channel phase-locked loop and generate a mixing signal. One of the mixing signals happens to be the same as the image frequency. If the energy of this effect is greater than or equal to the power of the image signal, it will limit the effect of the image calibration algorithm and limit further improvement of the transmitter's spectral purity.

[0065] Based on this, this application proposes a transmitter calibration device.

[0066] Please refer to Figure 1The transmitter calibration device includes:

[0067] The system comprises a compensation module 1, a signal conversion module 2, a transceiver circuit module 3, a signal processing module 4, and a control module 5. The first input terminal P1 of the compensation module 1 is used to receive digital signals, the second input terminal P2 of the compensation module 1 is connected to the output terminal of the control module 5, and the output terminal of the compensation module 1 is connected to the first input terminal A1 of the signal conversion module 2.

[0068] The second input terminal A2 of the signal conversion module 2 is connected to the output terminal of the transceiver circuit module 3, the first output terminal A3 of the signal conversion module 2 is connected to the first input terminal L1 of the transceiver circuit module 3, and the second output terminal A4 of the signal conversion module 2 is connected to the input terminal of the signal processing module 4.

[0069] The second input terminal L2 of the transceiver circuit module 3 is connected to the output terminal of the control module 5;

[0070] The output terminal of the signal processing module 4 is connected to the input terminal of the control module 5;

[0071] The compensation module 1 is used to adjust the compensation coefficient according to the first output signal of the control module 5, and the first output signal is used to reduce the influence of the image power signal on the transmit power signal.

[0072] The transceiver circuit module 3 is used to adjust the gain parameter according to the second output signal of the control module 5. The second output signal is used to reduce the influence of the mixing power signal on the transmit power signal.

[0073] The transmitter calibration device also includes a signal generator 6, which is a device that can provide signals of various frequencies, waveforms and output levels. It is used to provide accurate excitation signals during the calibration process of the transmitter calibration device. The signal generator 6 is used to generate digital intermediate frequency signals as input signals for the compensation module 1.

[0074] Compensation module 1 is a key module used to correct transmitter signals. Its main function is to offset system deviations and improve signal quality through pre-compensation technology. Specifically, it can include: offsetting the local oscillator leakage signal generated during mixing by using digital and pre-compensation values ​​to ensure the purity of the transmitted signal; adjusting the amplitude and phase consistency of the IQ channels with dynamic compensation coefficients to eliminate low-frequency interference caused by DC bias and improve modulation accuracy; predicting the transmitter output signal through a feedback control system to generate a reverse correction signal to offset harmonic distortion and intermodulation components; and updating the calibration coefficients in real time to adapt to performance drift caused by environmental factors such as temperature changes and device aging.

[0075] Signal conversion module 2 is used to convert signal types. It can convert digital signals to analog signals and vice versa, to match the signal requirements of the transmitter calibration device.

[0076] The transceiver circuit module 3 is used to transmit, receive, and regulate signals, and can improve signal strength to meet transmission requirements; ensure that the signal frequency remains stable when voltage or environmental changes, etc.

[0077] Signal processing module 4 performs spectrum shifting, filtering, and power detection on the signal, and the processed signal is recognized by control module 5.

[0078] The control module 5 adjusts the gain of the transceiver circuit module 3 and the compensation coefficient of the compensation module 1 based on the received power signal.

[0079] The working process of the above-mentioned transmitter calibration device is as follows:

[0080] Signal generator 6 generates a digital intermediate frequency signal, which is output to the input of compensation module 1 through its output terminal;

[0081] The compensation module 1 receives the digital intermediate frequency signal output by the signal generator 6, adds the compensation coefficient obtained from the calibration to the digital intermediate frequency signal, and then outputs it to the signal conversion module 2.

[0082] Signal conversion module 2 receives the digital intermediate frequency signal after the compensation coefficient has been added, converts the signal from a digital signal to an analog intermediate frequency signal, and then outputs it to transceiver circuit module 3;

[0083] After receiving the analog intermediate frequency signal, the transceiver circuit module 3 performs frequency conversion processing on the analog intermediate frequency signal and outputs it to the signal conversion module 2;

[0084] Signal conversion module 2 receives the processed analog intermediate frequency signal, converts the processed analog intermediate frequency signal into a digital signal, and then outputs it to signal processing module 4;

[0085] The signal processing module 4 performs frequency shifting and filtering on the received digital signal, detects the power of the processed signal, obtains the transmit power signal, the mixing power signal and the image power signal, and then outputs them to the control module 5.

[0086] Based on the received transmit power signal, mixing power signal, and image power signal, control module 5 first adjusts the gain parameter of transceiver circuit module 3 to reduce the influence of mixing power signal on transmit power signal; then, based on the received transmit power signal, mixing power signal, and image power signal, control module 5 adjusts the compensation coefficient of compensation module 1 to reduce the influence of image power signal on transmit power signal.

[0087] In this embodiment, the transmitter calibration device includes a compensation module, a signal conversion module, a transceiver circuit module, a signal processing module, and a control module. The compensation module processes the received digital signal and outputs it to the signal conversion module. The signal conversion module converts the processed digital signal into an analog signal and outputs it to the transceiver circuit module. The transceiver circuit module performs frequency conversion processing on the analog signal and outputs it to the signal conversion module. After being converted back into a digital signal by the signal conversion module, it is output to the signal processing module. The signal processing module performs frequency shifting and filtering processing on the received digital signal and detects the power of the digital signal to obtain the transmit power signal, the mixing power signal, and the image power signal. These three signals are output to the control module. Based on the three received signals, the control module first adjusts the gain of the transceiver circuit module to reduce the influence of the mixing power signal on the transmit power signal. Then, based on the received transmit power signal, mixing power signal, and image power signal after gain adjustment, the control module adjusts the compensation coefficient of the compensation module to reduce the influence of the image power signal on the transmit power signal. By adjusting the gain of the transceiver circuit module through the control module, the mixing power signal is reduced, thereby reducing the impact of the mixing signal on the mirror calibration effect of the calibration module, and thus significantly improving the overall calibration effect of the transmitter.

[0088] In one embodiment, see Figure 2 The signal processing module 4 includes:

[0089] The signal processing unit 41 and the power detection unit 42 are provided. The input terminal of the signal processing unit 41 is connected to the second output terminal A4 of the signal conversion module 2, and the output terminal of the signal processing unit 41 is connected to the input terminal of the power detection unit 42. The output terminal of the power detection unit 42 is connected to the input terminal of the control module 5.

[0090] The signal processing unit 41 is a unit used to perform spectrum shifting and filtering on the received digital signal to separate signals of different frequency components. The signal processing unit 41 separates the superimposed transmitted signal, the mixed signal, and the image signal.

[0091] The power detection unit 42 is a module used to detect the power of each frequency component signal separated by the signal processing unit 41. The power detection unit 42 mainly quantizes the power of the transmitted signal, the mixed signal and the image signal.

[0092] The working process of the above-mentioned transmitter calibration device is as follows:

[0093] Signal generator 6 generates a digital intermediate frequency signal, which is output to the input of compensation module 1 through its output terminal;

[0094] The compensation module 1 receives the digital intermediate frequency signal output by the signal generator 6, adds the compensation coefficient obtained from the calibration to the digital intermediate frequency signal, and then outputs it to the signal conversion module 2.

[0095] Signal conversion module 2 receives the digital intermediate frequency signal after the compensation coefficient has been added, converts the signal from a digital signal to an analog intermediate frequency signal, and then outputs it to transceiver circuit module 3;

[0096] After receiving the analog intermediate frequency signal, the transceiver circuit module 3 performs frequency conversion processing on the analog intermediate frequency signal and outputs it to the signal conversion module 2;

[0097] The signal conversion module 2 receives the processed analog intermediate frequency signal, converts the processed analog intermediate frequency signal into a digital signal, and then outputs it to the signal processing unit 41.

[0098] The signal processing unit 41 performs frequency shifting and filtering on the received digital signal to obtain the transmitted signal, the mixed signal, and the mirror signal, and then outputs them to the power detection unit 42 through its output terminal; the power detection unit 42 detects the specific power of the transmitted signal, the mixed signal, and the mirror signal to obtain the transmitted power signal, the mixed power signal, and the mirror power signal, and then outputs them to the control module 5;

[0099] Based on the received transmit power signal, mixing power signal, and image power signal, control module 5 first adjusts the gain parameter of transceiver circuit module 3 to reduce the influence of mixing power signal on transmit power signal; then control module 5 adjusts the compensation coefficient of compensation module 1 based on the received transmit power signal, mixing power signal, and image power signal to reduce the influence of image power signal on transmit power signal.

[0100] In this embodiment, a signal processing unit and a power detection unit are included in the signal processing module. The signal processing unit performs spectrum shifting and filtering to accurately separate the transmitted signal, the mixed signal, and the image signal from the aliased signal. Then, the power detection unit accurately measures the specific power of the three signals to obtain the transmitted power signal, the mixed power signal, and the image power signal. These three signals are output to the control module. Based on the received three signals, the control module first adjusts the gain of the transceiver circuit module to reduce the influence of the mixed power signal on the transmitted power signal. Then, based on the received transmitted power signal, mixed power signal, and image power signal after gain adjustment, the control module adjusts the compensation coefficient of the compensation module to reduce the influence of the image power signal on the transmitted power signal. By adjusting the gain of the transceiver circuit module through the control module, the mixed power signal is reduced, thus reducing the influence of the mixed signal on the image calibration effect of the calibration module, thereby significantly improving the overall calibration effect of the transmitter.

[0101] In one embodiment, see Figure 3 The signal processing unit 41 includes:

[0102] A digital quadrature mixer 411 and a digital filter 412 are provided. The input terminal of the digital quadrature mixer 411 is connected to the second output terminal A4 of the signal conversion module 2, and the output terminal of the digital quadrature mixer 411 is connected to the input terminal of the digital filter 412. The output terminal of the digital filter 412 is connected to the input terminal of the power detection unit 42.

[0103] The digital quadrature mixer 411 is used to perform spectrum shifting processing on the digital signal output by the signal conversion module 2 to obtain a digital signal shifted to near zero frequency.

[0104] The digital filter 412 is used to filter and extract the digital signal that has been moved to the vicinity of zero frequency to obtain the corresponding zero-frequency signal.

[0105] Among them, see Figure 3 The transmitter calibration device also includes a numerically controlled oscillator (NCO), which is used to generate a frequency of... The quadrature signals NO_I and NO_Q are connected to the output of the numerically controlled oscillator and the input of the digital quadrature mixer 411.

[0106] Signal generator 6 generates a digital intermediate frequency signal and splits the signal into two paths, I and Q, with a 90° phase difference, and sends them to compensation module 1.

[0107] The compensation module 1 is divided into I-channel compensation and Q-channel compensation. Each channel compensation has gain compensation and phase compensation, that is, four compensation coefficients: I-channel gain compensation, I-channel phase compensation, Q-channel gain compensation and Q-channel phase compensation.

[0108] The signal conversion module 2 includes four converters: two digital-to-analog converters and two analog-to-digital converters. The two digital-to-analog converters convert the two digital signals output from the compensation module 1 into analog signals and output them to the transceiver circuit module 3. The two analog-to-digital converters convert the two digital signals processed by the transceiver circuit module 3 into analog signals and transmit them to the signal processing module 4.

[0109] The digital quadrature mixer 411 is a computational unit that realizes signal frequency shifting in the digital domain. Its core function is to shift the signal spectrum located at specific frequency points (such as the frequency points of the transmitted signal, the mixing signal, and the image signal) to near zero frequency by performing complex multiplication operations on the input digital signal and the quadrature local oscillator signal generated by the numerically controlled oscillator, so as to facilitate subsequent separation and extraction.

[0110] Digital filter 412 is a digital signal processor that performs frequency selection processing on a frequency-shifted signal. For example, a finite impulse response filter can be used. The core function of digital filter 412 is to filter the digital signal shifted to near zero frequency after being processed by a digital quadrature mixer, filter out high-frequency components and out-of-band noise, and accurately extract the desired signal components located near zero frequency to obtain a clean transmitted signal, mixed signal and image signal.

[0111] Specifically, the digital quadrature mixer 411 receives digital signals and the frequency output of the numerically controlled oscillator (NCO) is... Orthogonal signals, the digital signal is respectively compared with , and Multiplication yields the spectrum shifting effect; see [reference needed]. Figure 4 The specific spectral effects are as follows: downconversion will transmit the signal. Moved to near zero frequency Down-conversion will mix the signal. Moved to near zero frequency Upconverter will mirror the signal Moved to near zero frequency Then, the three signals are output to the digital filter 412.

[0112] The working process of the above-mentioned transmitter calibration device is as follows:

[0113] Signal generator 6 generates a digital intermediate frequency signal, which is output to the input of compensation module 1 through its output terminal;

[0114] The compensation module 1 receives the digital intermediate frequency signal output by the signal generator 6, adds the compensation coefficient obtained from the calibration to the digital intermediate frequency signal, and then outputs it to the signal conversion module 2.

[0115] Signal conversion module 2 receives the digital intermediate frequency signal after the compensation coefficient has been added, converts the signal from a digital signal to an analog intermediate frequency signal, and then outputs it to transceiver circuit module 3;

[0116] After receiving the analog intermediate frequency signal, the transceiver circuit module 3 performs frequency conversion processing on the analog intermediate frequency signal and outputs it to the signal conversion module 2;

[0117] Signal conversion module 2 receives the processed analog intermediate frequency signal, converts the processed analog intermediate frequency signal into a digital signal, and then outputs it to the digital quadrature mixer 411;

[0118] The digital quadrature mixer 411 receives a digital signal and a quadrature signal output from a numerically controlled oscillator (NCO). It performs frequency shifting on the received digital signal and outputs the frequency-shifted transmit signal, mix signal, and mirror signal to a digital filter 412. After filtering by the digital filter 412, the transmit signal, mix signal, and mirror signal are obtained and then output to the power detection unit 42 through the output terminal of the digital filter 412. The power detection unit 42 detects the specific power of the transmit signal, mix signal, and mirror signal, obtains the transmit power signal, mix power signal, and mirror power signal, and then outputs them to the control module 5.

[0119] Based on the received transmit power signal, mixing power signal, and image power signal, control module 5 first adjusts the gain parameter of transceiver circuit module 3 to reduce the influence of mixing power signal on transmit power signal; then control module 5 adjusts the compensation coefficient of compensation module 1 based on the received transmit power signal, mixing power signal, and image power signal to reduce the influence of image power signal on transmit power signal. In this embodiment, a digital quadrature mixer and a digital filter are set in the signal processing unit. The digital quadrature mixer receives the digital signal output from the signal conversion module and the quadrature signal output from the numerically controlled oscillator, and performs frequency shifting processing on the received digital signal to obtain the frequency-shifted transmit signal, mixed signal, and mirror signal. The three signals are then output to the digital filter for filtering processing to extract the signal near the zero frequency, obtaining the transmit signal, mixed signal, and mirror signal. These are then output to the power detection unit for processing to obtain the transmit power signal, mixed power signal, and mirror power signal. The three signals are then output to the control module. Based on the three received signals, the control module first adjusts the gain of the transceiver circuit module to reduce the influence of the mixed power signal on the transmit power signal. Then, based on the received transmit power signal, mixed power signal, and mirror power signal after gain adjustment, the control module adjusts the compensation coefficient of the compensation module to reduce the influence of the mirror power signal on the transmit power signal. By adjusting the gain of the transceiver circuit module through the control module, the mixed power signal is reduced, thus reducing the influence of the mixed signal on the mirror calibration effect of the calibration module, thereby significantly improving the overall calibration effect of the transmitter.

[0120] In one embodiment, see Figure 5 The transceiver circuit module 3 includes:

[0121] The transmitting circuit unit 31 and the receiving circuit unit 32 are provided. The first input terminal L1 of the transmitting circuit unit 31 is connected to the first output terminal A3 of the signal conversion module 2. The second input terminal L2 of the transmitting circuit unit 31 is connected to the output terminal of the control module 5. The output terminal of the transmitting circuit unit 31 is connected to the input terminal of the receiving circuit unit 32. The output terminal of the receiving circuit unit 32 is connected to the second input terminal A2 of the signal conversion module 2.

[0122] The transmitting circuit unit 31 is an analog circuit module used to upconvert baseband or intermediate frequency signals to radio frequency and amplify their power. Its core function is to complete signal modulation and pre-transmission drive, during which IQ mismatch and circuit coupling interference will inevitably occur.

[0123] The receiving circuit unit 32 is an analog circuit used to receive the radio frequency signal output by the transmitting circuit unit 31 in a preset mode and down-convert it to intermediate frequency or baseband for subsequent sampling and analysis. Its main function is to form an internal loop path to provide the signal to be analyzed for the calibration algorithm.

[0124] The working process of the above-mentioned transmitter calibration device is as follows:

[0125] Signal generator 6 generates a digital intermediate frequency signal, which is output to the input of compensation module 1 through its output terminal;

[0126] The compensation module 1 receives the digital intermediate frequency signal output by the signal generator 6, adds the compensation coefficient obtained from the calibration to the digital intermediate frequency signal, and then outputs it to the signal conversion module 2.

[0127] The signal conversion module 2 receives the digital intermediate frequency signal after the compensation coefficient is added, converts the signal from a digital signal to an analog intermediate frequency signal, and then outputs it to the transmitting circuit unit 31;

[0128] After receiving the analog intermediate frequency signal, the transmitting circuit unit 31 performs frequency conversion processing on the analog intermediate frequency signal and outputs it to the receiving circuit unit 32. The signal received by the receiving circuit unit 32 is then processed by frequency conversion again and output to the signal conversion module 2.

[0129] Signal conversion module 2 receives the processed analog intermediate frequency signal, converts the processed analog intermediate frequency signal into a digital signal, and then outputs it to the digital quadrature mixer 411;

[0130] The digital quadrature mixer 411 receives a digital signal and a quadrature signal output from a numerically controlled oscillator (NCO). It performs frequency shifting on the received digital signal and outputs the frequency-shifted transmit signal, mix signal, and mirror signal to a digital filter 412. After filtering by the digital filter 412, the transmit signal, mix signal, and mirror signal are obtained and then output to the power detection unit 42 through the output terminal of the digital filter 412. The power detection unit 42 detects the specific power of the transmit signal, mix signal, and mirror signal, obtains the transmit power signal, mix power signal, and mirror power signal, and then outputs them to the control module 5.

[0131] Based on the received transmit power signal, mix power signal and image power signal, the control module 5 outputs a first output signal to adjust the gain parameters of the transmit circuit unit 31 and the receive circuit unit 32. After adjustment, the control module receives the transmit power signal, mix power signal and image power signal with the adjusted gain parameters again.

[0132] After the mixing power signal is reduced, the control module 5 adjusts the compensation coefficient of the compensation module 1 according to the transmit power signal, mixing power signal and image power signal after the gain parameter is adjusted, so as to reduce the influence of the image power signal on the transmit power signal.

[0133] In this embodiment, a transmitting circuit unit and a receiving circuit unit are set in the transceiver circuit module. The gain parameters of the transmitting and receiving circuit units are adjusted by the control module to reduce the mixing power signal, thereby reducing the impact of the mixing power signal on the transmitting power signal. Then, based on the received transmitting power signal, mixing power signal, and image power signal after the gain adjustment, the control module adjusts the compensation coefficient of the compensation module to reduce the impact of the image power signal on the transmitting power signal. By adjusting the gain of the transceiver circuit module through the control module, the mixing power signal is reduced, thus reducing the impact of the mixing signal on the image calibration effect of the calibration module, and significantly improving the overall calibration effect of the transmitter.

[0134] In one embodiment, see Figure 3 The transmitting circuit unit 31 includes:

[0135] The transmitter intermediate frequency circuit 311, the transmitter mixer TXIIX, the transmitter phase-locked loop TXILL, the transmitter divider circuit TXIVIV2, the power preamplifier PPA, and the balun are provided. The input terminal of the transmitter intermediate frequency circuit 311 is connected to the first output terminal A3 of the signal conversion module 2, and the output terminal of the transmitter intermediate frequency circuit 311 is connected to the first input terminal D1 of the transmitter mixer TXIIX.

[0136] The second input terminal D2 of the transmit mixer TXIIX is connected to the output terminal of the transmit divider circuit TXDIV2, and the output terminal of the transmit mixer TXIIX is connected to the first input terminal F1 of the power preamplifier PPA.

[0137] The input terminal of the transmit phase-locked loop (TXPLL) is connected to the output terminal of the control module 5, and the output terminal of the transmit phase-locked loop is connected to the input terminal of the transmit frequency divider circuit (TXDIV2).

[0138] The second input terminal F2 of the power preamplifier PPA is connected to the output terminal of the control module 5, and the output terminal of the power preamplifier PPA is connected to the input terminal of the balun. The balun is used to output the transmission signal.

[0139] Among them, the transmitting intermediate frequency circuit 311 is a circuit used to filter and condition analog baseband or digital intermediate frequency signals, and its function is to filter out noise and aliasing components outside the signal band.

[0140] The transmit mixer TXMIX is a component that performs frequency conversion. Its function is to mix the conditioned intermediate frequency signal with the local oscillator signal, and upconvert the signal spectrum to the radio frequency.

[0141] The transmit phase-locked loop (TXPLL) is a closed-loop feedback control system whose function is to generate a highly stable and precisely controllable high-frequency local oscillator signal to provide a carrier for the transmit mixer (TXMIX).

[0142] The transmit frequency divider circuit TXDIV2 is a frequency divider circuit. Its function is to divide the high-frequency local oscillator signal output by the transmit phase-locked loop TXPLL by two to generate two orthogonal local oscillator signals to supply the I and Q mixers, and affect the waveform and phase noise characteristics of the local oscillator signal.

[0143] The power preamplifier (PPA) is a driver stage amplifier in the transmit channel. Its function is to initially amplify the radio frequency signal to provide sufficient drive power to the subsequent circuits. Its gain can be adjusted for optimization.

[0144] A balun is a balanced-to-unbalanced converter that converts the differential signal output from a power preamplifier (PPA) into a single-ended signal for radiation through an antenna or single-ended port. Its physical structure is also one of the main sources of electromagnetic coupling with a phase-locked loop (PLL).

[0145] Understandably, the coupling between the balun and the VCO inductance inside the emitter phase-locked loop (TXPLL) results in... and The mixed signal, due to its consistent generation mechanism, belongs to... The frequency is spaced 2 units apart on each side. The energy of the frequency signals remains basically the same; if no calibration is performed, these signals will be superimposed on the transmitted signal and output together.

[0146] See Figure 3 The receiving circuit unit 32 includes a low-noise amplifier (LNA), a receiving mixer (RXMIX), and a receiving intermediate frequency circuit (IF) 321, as well as a receiving phase-locked loop (PLL).

[0147] Among them, see Figure 3 The output of the control module is connected to the input of the transmit phase-locked loop (TXPLL), the second input F2 of the power preamplifier (PPA), and the first input of the receive intermediate frequency circuit (IF circuit) 321. It can be understood that the input of the transmit phase-locked loop (TXPLL), the second input F2 of the power preamplifier (PPA), and the first input of the receive intermediate frequency circuit (IF circuit) 321 together form the second input L2 of the transceiver circuit module 3.

[0148] The working process of the above-mentioned transmitter calibration device is as follows:

[0149] Signal generator 6 generates a digital intermediate frequency signal, which is output to the input of compensation module 1 through its output terminal;

[0150] The compensation module 1 receives the digital intermediate frequency signal output by the signal generator 6, adds the compensation coefficient obtained from the calibration to the digital intermediate frequency signal, and then outputs it to the signal conversion module 2.

[0151] The signal conversion module 2 receives the digital intermediate frequency signal after the compensation coefficient is added, converts the signal from a digital signal to an analog intermediate frequency signal, and then outputs it to the transmitting intermediate frequency circuit 311;

[0152] After receiving the analog intermediate frequency signal, the transmitting intermediate frequency circuit 311 filters the signal to remove out-of-band aliasing signals, and then outputs the signal to the transmitting channel mixer TXMIX. Simultaneously, the transmitting channel phase-locked loop TXPLL locks the frequency to [the specified value]. The signal is output to the transmit frequency divider circuit TXDIV2. After being divided by the transmit frequency divider circuit TXDIV2, the resulting frequency is... The signal is also output to the transmit mixer TXMIX, which will... The frequency of the analog intermediate frequency signal is obtained after up-conversion. The frequency radio frequency signal is output to the power preamplifier PPA for amplification, and then output to the receiver mixer RXIX in the receiver circuit unit 32.

[0153] The receive mixer RXMIX will receive the frequency as The signal is down-converted again to obtain... The analog intermediate frequency signal is then output to the receiving intermediate frequency circuit 321 for amplification and then output to the signal conversion module 2;

[0154] Signal conversion module 2 receives the amplified signal. The analog intermediate frequency signal is processed and converted into a digital signal, which is then output to the digital quadrature mixer 411.

[0155] The digital quadrature mixer 411 receives a digital signal and a quadrature signal output from a numerically controlled oscillator (NCO). It performs frequency shifting on the received digital signal and outputs the frequency-shifted transmit signal, mix signal, and mirror signal to a digital filter 412. After filtering by the digital filter 412, the transmit signal, mix signal, and mirror signal are obtained and then output to the power detection unit 42 through the output terminal of the digital filter 412. The power detection unit 42 detects the specific power of the transmit signal, mix signal, and mirror signal, obtains the transmit power signal, mix power signal, and mirror power signal, and then outputs them to the control module 5.

[0156] Based on the received transmit power signal, mixing power signal, and mirror power signal, control module 5 outputs a first output signal to adjust the voltage-controlled oscillator (VCO) current (TXVCO_ISEL) of the transmit phase-locked loop (TXPLL). This adjustment increases the current to increase the energy on the inductor of the transmit PLL, reduces the influence of the balun on the transmit PLL, and reduces the mixing signal. After reducing the mixing signal, control module 5 receives the transmit power signal, mixing power signal, and mirror power signal again after the VCO current (TXVCO_ISEL) is increased. It then selects the VCO current (TXVCO_ISEL) with the smallest ratio of the mixing power signal to the transmit power signal as the final current adjustment parameter.

[0157] Then, the control module 5 receives the transmit power signal, mixing power signal, and mirror power signal under the final voltage-controlled oscillator (VCO) current TXVCO_ISEL. It reduces the pre-gain TXRF_GAIN of the power preamplifier (PPA) and increases the pre-gain RXIF_GAIN of the receiving intermediate frequency circuit (IFC) 321. This ensures that the signal power output from the IFC 321 to the signal conversion module 2 is close to its full scale, thereby increasing the signal-to-noise ratio. Then, the control module 5 receives the transmit power signal, mixing power signal, and mirror power signal after adjusting the pre-gain TXRF_GAIN of the power preamplifier (PPA) and the pre-gain RXIF_GAIN of the receiving IFC 321. It selects TXRF_GAIN and RXIF_GAIN, which have the smallest ratio of the mixing power signal to the transmit power signal, as the final gain adjustment parameters to reduce the mixing power signal.

[0158] After the mixing power signal is reduced, the control module 5 adjusts the compensation coefficient of the compensation module 1 according to the transmit power signal, mixing power signal and image power signal after the gain parameter is adjusted, so as to reduce the influence of the image power signal on the transmit power signal.

[0159] See Figure 6 , Figure 6 The transmit output spectrum composition before calibration, including the mixing power signal generated by balun and phase-locked loop mixing. and Its power is p1, see reference. Figure 6 Top left image; mirror frequency signal Its power is p2, see [reference] Figure 6 Bottom left image; actual transmitted output and The powers of the frequency components are p1+p2, see reference. Figure 6 Right image;

[0160] If only image calibration is performed without mixing signal calibration, the transmit output results can be found in [reference needed]. Figure 7 Due to the output The power at the frequency is p1+p2 (see reference). Figure 7 The right figure includes two parts, p1 and p2. If the power of p1 and p2 are close, then even if mirror calibration reduces p2 (see figure 1). Figure 7 (See the lower left figure) The power of the output signal p1+p2 still cannot be significantly reduced, and will always be greater than p1, meaning it is impossible to calibrate and obtain an output power signal smaller than p1;

[0161] See Figure 8 After calibration according to this application, the mixing power signal of power p1 is first reduced. and Then reduce the mirror power signal of power p2. To obtain the actual transmitted output , The power of the frequency components are p1+p2 and p1 respectively (see reference) Figure 8 (See right figure), which is significantly smaller than the result before calibration.

[0162] In this embodiment, the transmitting circuit unit includes a transmitting intermediate frequency circuit, a transmitting mixer, a transmitting phase-locked loop (PLL), a transmitting divider circuit, a power preamplifier, and a balun. Based on the first output signal from the control module, the voltage-controlled oscillator current of the transmitting PLL, the pre-gain of the power preamplifier, and the pre-gain of the receiving intermediate frequency circuit are adjusted to reduce the mixing power signal. Then, based on the received transmitting power signal, mixing power signal, and mirror power signal after gain adjustment, the control module adjusts the compensation coefficient of the compensation module to reduce the influence of the mirror power signal on the transmitting power signal. By adjusting the gain of the transceiver circuit module through the control module, the mixing power signal is reduced, thus reducing the impact of the mixing signal on the mirror calibration effect of the calibration module, thereby significantly improving the overall calibration effect of the transmitter.

[0163] In one embodiment, see Figure 3 The transmitter calibration device further includes:

[0164] The switch module 7 is disposed on the connection line between the transmitting circuit unit 31 and the receiving circuit unit 32. The switching on and off of the switch module 7 is controlled by the control module 5. The switch module 7 is used to form a loop between the transmitting circuit unit 31 and the receiving circuit unit 32 so that the transmitting phase-locked loop (TXPLL) is in a locked state.

[0165] The switch module 7 contains three switches: switch S1, switch S2 and switch S3.

[0166] When the transmitter calibration device performs the calibration function, the control module 5 first controls switch S1 to open and controls switches S2 and S3 to close, so that the transmitting circuit unit 31 and the receiving circuit unit 32 form a loop, so that the transmitting phase-locked loop (TXPLL) is in a locked state.

[0167] In this embodiment, a switch module is included in the transmitter calibration device. A control module controls the on / off state of each switch, creating a loop between the transmitting and receiving circuit units. This ensures the transmitting phase-locked loop (PLL) is locked, allowing the control module to receive the transmit power signal, the mixing power signal, and the image power signal. The control module then adjusts the gain of the transceiver circuit module. Based on the received transmit power signal, mixing power signal, and image power signal after gain adjustment, the compensation coefficient of the compensation module is adjusted to reduce the influence of the image power signal on the transmit power signal. By adjusting the gain of the transceiver circuit module through the control module, the mixing power signal is reduced, thus reducing the impact of the mixing signal on the image calibration effect of the calibration module, thereby significantly improving the overall calibration effect of the transmitter.

[0168] It should be noted that the above examples are only for the purpose of assisting in understanding this application and do not constitute a limitation on the transmitter calibration device of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0169] This application also provides a transmitter calibration method, please refer to... Figure 9 The transmitter calibration method includes:

[0170] S10 generates and processes a calibration signal to obtain a processed digital signal;

[0171] Among them, see Figure 3 The calibration signal refers to the known digital test signal generated by the signal generator 6 for IQ mismatch calibration. It is usually a single-frequency sine wave or a digital sequence with a specific pattern. Its function is to serve as an excitation source to expose the gain and phase mismatch of the system. In this application, it is the digital intermediate frequency signal generated by the signal generator 6.

[0172] Processing refers to the compensation processing, digital-to-analog conversion processing, frequency conversion processing, and digital-to-analog conversion processing performed on the digital intermediate frequency signal generated by signal generator 6;

[0173] The processed digital signal refers to the digital intermediate frequency signal generated after compensation processing, digital-to-analog conversion processing, frequency conversion processing, and digital-to-analog conversion processing.

[0174] Specifically, see Figure 3 The signal generator 6 generates a digital intermediate frequency signal, which is output to the input of the compensation module 1 through its output terminal;

[0175] The compensation module 1 receives the digital intermediate frequency signal output by the signal generator 6, adds the preset compensation coefficient to the digital intermediate frequency signal, and then outputs it to the signal conversion module 2.

[0176] The signal conversion module 2 receives the digital intermediate frequency signal after the compensation coefficient is added, converts the signal from a digital signal to an analog intermediate frequency signal, and then outputs it to the transmitting intermediate frequency circuit 311;

[0177] After receiving the analog intermediate frequency signal, the transmitting intermediate frequency circuit 311 filters the signal to remove out-of-band aliasing signals, and then outputs the signal to the transmitting channel mixer TXMIX. Simultaneously, the transmitting channel phase-locked loop TXPLL locks the frequency to [the specified value]. The signal is output to the transmit frequency divider circuit TXDIV2. After being divided by the transmit frequency divider circuit TXDIV2, the resulting frequency is... The signal is also output to the transmit mixer TXMIX, which will... The frequency of the analog intermediate frequency signal is obtained after up-conversion. The frequency radio frequency signal is output to the power preamplifier PPA for amplification, and then output to the receiver mixer RXIX in the receiver circuit unit 32.

[0178] The receive mixer RXMIX will receive the frequency as The signal is down-converted again to obtain... The analog intermediate frequency signal is then output to the receiving intermediate frequency circuit 321 for amplification and then output to the signal conversion module 2;

[0179] Signal conversion module 2 receives the amplified signal. The analog intermediate frequency signal is processed and then converted into a digital signal, thus obtaining the processed digital signal.

[0180] S20, based on the digital signal, frequency shift filtering is performed by the signal processing module to obtain the transmit power signal, the mixing power signal and the image power signal;

[0181] Frequency shifting and filtering refers to a combined operation performed on a signal using digital signal processing techniques. It comprises two core steps: frequency shifting involves moving the signal spectrum from its original frequency point to near zero; filtering involves extracting the desired baseband component near zero from the frequency-shifted signal and filtering out high-frequency components and other interference. The purpose of this processing is to accurately separate the three key components—the transmitted signal, the mixed signal, and the image signal—from the aliased feedback signal.

[0182] Specifically, see Figure 1 The signal processing module 4 performs frequency shifting and filtering on the received digital signal, detects the power of the processed signal, and obtains the transmit power signal, the mixing power signal and the image power signal, and then outputs them to the control module 5.

[0183] S30, based on the transmit power signal, the mixing power signal and the image power signal, perform step-by-step calibration to reduce the mixing power signal and the image power signal.

[0184] Among them, see Figure 1 Based on the received transmit power signal, mixing power signal, and image power signal, control module 5 first adjusts the gain parameter of transceiver circuit module 3 to reduce the influence of mixing power signal on transmit power signal; then, based on the received transmit power signal, mixing power signal, and image power signal, control module 5 adjusts the compensation coefficient of compensation module 1 to reduce the influence of image power signal on transmit power signal.

[0185] In this embodiment, a calibration signal is generated and processed. The processed digital signal is then processed by a signal processing module for spectrum shifting, filtering, and power detection to obtain a transmit power signal, a mixing power signal, and a mirror power signal, which are then output to the control module. The control module performs step-by-step calibration based on the three received signals to reduce the influence of the mixing power signal and the mirror power signal on the transmit power signal, thereby significantly improving the overall calibration effect of the transmitter.

[0186] In one embodiment, before generating and processing the calibration signal in step S10, the method further includes:

[0187] The switching module is controlled to form a loop between the transmitting circuit unit and the receiving circuit module, ensuring that the transmitting phase-locked loop is in a locked state.

[0188] Among them, see Figure 3 The switch module 7 has three switches: switch S1, switch S2 and switch S3.

[0189] When the transmitter calibration device performs the calibration function, the control module 5 first controls switch S1 to open and controls switches S2 and S3 to close, so that the transmitting circuit unit 31 and the receiving circuit unit 32 form a loop, so that the transmitting phase-locked loop (TXPLL) is in a locked state.

[0190] In this embodiment, the control module controls the on / off state of each switch in the switching module, so that the transmitting circuit unit and the receiving circuit unit form a loop, ensuring that the transmitting phase-locked loop is in a locked state. The control module receives the transmitting power signal, the mixing power signal, and the mirror power signal, and then performs step-by-step calibration to reduce the influence of the mixing power signal and the mirror power signal on the transmitting power signal, thereby significantly improving the overall calibration effect of the transmitter.

[0191] In one embodiment, see Figure 10 In step S20, the step of performing frequency shift filtering processing on the digital signal through the signal processing module to obtain the transmit power signal, the mixing power signal, and the image power signal specifically includes:

[0192] S201, the processed digital signal is processed to obtain a transmission signal down-converted to near zero frequency, a mixing signal down-converted to near zero frequency, and an image signal up-converted to near zero frequency;

[0193] Spectrum shifting refers to a signal processing technique that alters the frequency position of a signal in the digital domain. It achieves this by multiplying the input digital signal with one or more digital local oscillator signals of specific frequencies, thereby shifting the signal spectrum from its original position on the frequency axis to a new target position. For example, it can shift the transmitted signal, mixer signal, and image signal located at the intermediate frequency to near the zero frequency, facilitating subsequent filtering and power detection.

[0194] For details, please refer to Figure 3 The digital signal received by the digital quadrature mixer 411 and the frequency output by the numerically controlled oscillator (NCO) are... Orthogonal signals, the digital signal is respectively compared with , and Multiplication yields the spectrum shifting effect; see [reference needed]. Figure 4 The specific spectral effects are as follows: downconversion will transmit the signal. Moved to near zero frequency Down-conversion will mix the signal. Moved to near zero frequency Upconverter will mirror the signal Moved to near zero frequency .

[0195] S202, the down-converted transmission signal to near zero frequency, the down-converted mixing signal to near zero frequency, and the up-converted mirror signal to near zero frequency are filtered to obtain the transmission signal, the mixing signal, and the mirror signal;

[0196] Among them, filtering refers to a digital signal processing operation that extracts specific frequency components from a signal and suppresses other components.

[0197] For details, please refer to Figure 3 The digital signal shifted to the vicinity of zero frequency after being processed by the digital quadrature mixer is filtered by the digital filter 412 to remove high-frequency components and out-of-band noise, and to accurately extract the desired signal components located near zero frequency, thus obtaining a pure transmit signal, mixed signal and image signal.

[0198] S203, the power of the transmitted signal, the mixed signal and the mirror signal are detected to obtain the transmitted power signal, the mixed power signal and the mirror power signal.

[0199] For details, please refer to Figure 3 The power detection unit 42 detects the specific power of the transmitted signal, the mixed signal, and the image signal to obtain the transmitted power signal, the mixed power signal, and the image power signal.

[0200] In this embodiment, the digital signal processed by the digital quadrature mixer is further processed to obtain a transmit signal down-converted to near zero frequency, a mix signal down-converted to near zero frequency, and an image signal up-converted to near zero frequency. These signals are then output to a power detection unit to detect the specific power of the transmit signal, mix signal, and image signal, thus obtaining the transmit power signal, mix power signal, and image power signal. The control module receives the transmit power signal, mix power signal, and image power signal and then performs step-by-step calibration to reduce the influence of the mix power signal and image power signal on the transmit power signal, thereby significantly improving the overall calibration effect of the transmitter.

[0201] In one embodiment, see Figure 11 In step S30, the step-by-step calibration based on the transmit power signal, the mixing power signal, and the image power signal, to reduce the mixing power signal and the image power signal, specifically includes:

[0202] S301, the control module acquires the transmit power signal, the mixing power signal and the mirror power signal, adjusts the current value of the voltage-controlled oscillator of the transmit phase-locked loop, and selects the current value with the smallest ratio of the mixing power signal to the transmit power signal when the transmit phase-locked loop is in a locked state.

[0203] For details, please refer to Figure 3 Based on the received transmit power signal, mixing power signal, and mirror power signal, control module 5 outputs a first output signal to adjust the voltage-controlled oscillator (VCO) current (TXVCO_ISEL) of the transmit phase-locked loop (TXPLL). This adjustment increases the current to increase the energy on the inductor of the transmit PLL, reduces the influence of the balun on the transmit PLL, and reduces the mixing signal. After reducing the mixing signal, control module 5 receives the transmit power signal, mixing power signal, and mirror power signal again after the VCO current (TXVCO_ISEL) is increased. It then selects the VCO current (TXVCO_ISEL) with the smallest ratio of the mixing power signal to the transmit power signal as the final current adjustment parameter.

[0204] S302, Adjust the gain of the power preamplifier and the gain of the receiving intermediate frequency circuit of the receiving circuit unit. Under the condition that the sum of the gain of the power preamplifier and the gain of the receiving intermediate frequency circuit of the receiving circuit unit is a fixed value, select the gain of the power preamplifier and the gain of the receiving intermediate frequency circuit of the receiving circuit unit that minimizes the ratio of the mixed power signal to the transmitted power signal.

[0205] For details, please refer to Figure 3The control module 5 receives the transmit power signal, mixing power signal, and mirror power signal under the final voltage-controlled oscillator (VCO) current TXVCO_ISEL. It reduces the pre-gain TXRF_GAIN of the power preamplifier (PPA) and increases the pre-gain RXIF_GAIN of the receiving intermediate frequency circuit (IFC) 321. This ensures that the signal power output from the IFC 321 to the signal conversion module 2 is close to its full scale, thereby increasing the signal-to-noise ratio. Then, the control module 5 receives the transmit power signal, mixing power signal, and mirror power signal after adjusting the pre-gain TXRF_GAIN of the power preamplifier (PPA) and the pre-gain RXIF_GAIN of the IFC 321. It selects TXRF_GAIN and RXIF_GAIN, which have the smallest ratio of the mixing power signal to the transmit power signal, as the final gain adjustment parameters to reduce the mixing power signal.

[0206] S303, adjust the compensation coefficient of the compensation module, and select the compensation coefficient that minimizes the ratio of the image power signal to the transmitted power signal.

[0207] For details, please refer to Figure 3 After the mixing power signal decreases, the control module 5 adjusts the compensation coefficient of the compensation module 1 according to the transmit power signal, mixing power signal and image power signal after the gain parameter is adjusted, so as to reduce the influence of the image power signal on the transmit power signal.

[0208] See Figure 6 , Figure 6 The transmit output spectrum composition before calibration, including the mixing power signal generated by balun and phase-locked loop mixing. and Its power is p1, see reference. Figure 6 Top left image; mirror frequency signal Its power is p2, see [reference] Figure 6 Bottom left image; actual transmitted output and The powers of the frequency components are p1+p2, see reference. Figure 6 Right image;

[0209] If only image calibration is performed without mixing signal calibration, the transmit output results can be found in [reference needed]. Figure 7 Due to the output The power at the frequency is p1+p2 (see reference). Figure 7 The right figure includes two parts, p1 and p2. If the power of p1 and p2 are close, then even if mirror calibration reduces p2 (see figure 1). Figure 7 (See the lower left figure) The power of the output signal p1+p2 still cannot be significantly reduced, and will always be greater than p1, meaning it is impossible to calibrate and obtain an output power signal smaller than p1;

[0210] See Figure 8 After calibration according to this application, the mixing power signal of power p1 is first reduced. and Then reduce the mirror power signal of power p2. To obtain the actual transmitted output , The power of the frequency components are p1+p2 and p1 respectively (see reference) Figure 8 (See right figure), which is significantly smaller than the result before calibration.

[0211] In this embodiment, the control module adjusts the voltage-controlled oscillator current of the transmitting phase-locked loop, the pre-gain of the power preamplifier, and the pre-gain of the receiving intermediate frequency circuit based on the acquired transmit power signal, the mixed power signal, and the mirrored power signal. This reduces the mixed power signal. Then, the control module adjusts the compensation coefficient of the compensation module based on the received transmit power signal, mixed power signal, and mirrored power signal after gain adjustment, further reducing the impact of the mirrored power signal on the transmit power signal. By adjusting the gain of the transceiver circuit module, the control module reduces the mixed power signal, thus reducing its impact on the mirrored calibration effect of the calibration module, and significantly improving the overall calibration effect of the transmitter.

[0212] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent scope of this application.

Claims

1. A transmitter calibration apparatus, characterized by, The transmitter calibration device comprises: The compensation module, the signal conversion module, the transceiver circuit module, the signal processing module and the control module, the first input end of the compensation module is used for receiving a digital signal, the second input end of the compensation module is connected with the output end of the control module, and the output end of the compensation module is connected with the first input end of the signal conversion module; The second input end of the signal conversion module is connected with the output end of the transceiver circuit module, the first output end of the signal conversion module is connected with the first input end of the transceiver circuit module, and the second output end of the signal conversion module is connected with the input end of the signal processing module; The second input end of the transceiver circuit module is connected with the output end of the control module; The output end of the signal processing module is connected with the input end of the control module; The compensation module is used for adjusting a compensation coefficient according to the first output signal of the control module, and the first output signal is used for reducing the influence of the image power signal on the transmission power signal; The transceiver circuit module is used for adjusting a gain parameter according to the second output signal of the control module, and the second output signal is used for reducing the influence of the mixed power signal on the transmission power signal.

2. The transmitter calibration apparatus of claim 1, wherein, The signal processing module comprises: The signal processing unit and the power detection unit, the input end of the signal processing unit is connected with the second output end of the signal conversion module, the output end of the signal processing unit is connected with the input end of the power detection unit, and the output end of the power detection unit is connected with the input end of the control module.

3. The transmitter calibration apparatus of claim 2, wherein, The signal processing unit comprises: The digital quadrature frequency mixer and the digital filter, the input end of the digital quadrature frequency mixer is connected with the second output end of the signal conversion module, the output end of the digital quadrature frequency mixer is connected with the input end of the digital filter, and the output end of the digital filter is connected with the input end of the power detection unit; The digital quadrature frequency mixer is used for performing spectrum shift processing on the digital signal output by the signal conversion module to obtain a digital signal shifted to the vicinity of zero frequency; The digital filter is used for filtering the digital signal shifted to the vicinity of zero frequency to obtain a corresponding zero frequency signal.

4. The transmitter calibration apparatus of claim 1, wherein, The transceiver circuit module comprises: The transmitting circuit unit and the receiving circuit unit, the first input end of the transmitting circuit unit is connected with the first output end of the signal conversion module, the second input end of the transmitting circuit unit is connected with the output end of the control module, the output end of the transmitting circuit unit is connected with the input end of the receiving circuit unit, and the output end of the receiving circuit unit is connected with the second input end of the signal conversion module.

5. The transmitter calibration apparatus of claim 4, wherein, The transmitting circuit unit comprises: The transmitting intermediate frequency circuit, the transmitting frequency mixer, the transmitting phase-locked loop, the transmitting frequency division circuit, the power preamplifier and the balun, the input end of the transmitting intermediate frequency circuit is connected with the first output end of the signal conversion module, and the output end of the transmitting intermediate frequency circuit is connected with the first input end of the transmitting frequency mixer; The second input end of the transmitting frequency mixer is connected with the output end of the transmitting frequency division circuit, and the output end of the transmitting frequency mixer is connected with the first input end of the power preamplifier; An input end of the transmitting phase-locked loop is connected to an output end of the control module, and an output end of the transmitting phase-locked loop is connected to an input end of the transmitting frequency division circuit; A second input end of the power pre-amplifier is connected to an output end of the control module, and an output end of the power pre-amplifier is connected to an input end of the balun, and the balun is used for outputting a transmitting signal.

6. The transmitter calibration apparatus of claim 5, wherein, The transmitter calibration device further comprises: A switch module is arranged on a connection line between the transmitting circuit unit and the receiving circuit unit, and the switch module is controlled by the control module, and the switch module is used for forming a loop between the transmitting circuit unit and the receiving circuit unit, so that the transmitting phase-locked loop is in a locked state.

7. A transmitter calibration method, characterized by, The transmitter calibration method comprises: generating a calibration signal and processing the calibration signal to obtain a processed digital signal; based on the digital signal, performing frequency shift filtering processing on the digital signal by a signal processing module to obtain a transmitting power signal, a mixing power signal and an image power signal; based on the transmitting power signal, the mixing power signal and the image power signal, performing step-by-step calibration to reduce the mixing power signal and the image power signal.

8. The method of calibrating a transmitter of claim 7, wherein, Before the generating a calibration signal and processing the calibration signal, the method further comprises: controlling the switch module to form a loop between the transmitting circuit unit and the receiving circuit module, so as to ensure that the transmitting phase-locked loop is in a locked state.

9. The method of calibrating a transmitter of claim 8, wherein, The frequency shift filtering processing based on the digital signal by the signal processing module to obtain the transmitting power signal, the mixing power signal and the image power signal specifically comprises: performing spectrum shift processing on the processed digital signal to obtain a transmitting signal down-converted to a frequency close to zero, a mixing signal down-converted to a frequency close to zero and an image signal up-converted to a frequency close to zero; performing filtering processing on the transmitting signal down-converted to a frequency close to zero, the mixing signal down-converted to a frequency close to zero and the image signal up-converted to a frequency close to zero to obtain a transmitting signal, a mixing signal and an image signal; detecting the power of the transmitting signal, the mixing signal and the image signal to obtain the transmitting power signal, the mixing power signal and the image power signal.

10. The method of calibrating a transmitter of claim 8, wherein, The step-by-step calibration based on the transmitting power signal, the mixing power signal and the image power signal to reduce the mixing power signal and the image power signal specifically comprises: the control module acquires the transmitting power signal, the mixing power signal and the image power signal, adjusts the current value of a voltage-controlled oscillator of the transmitting phase-locked loop, and selects the current value when the ratio of the mixing power signal to the transmitting power signal is the smallest when the transmitting phase-locked loop is in a locked state; adjusting the gain of the power pre-amplifier and the gain of a receiving intermediate frequency circuit of the receiving circuit unit, and selecting the gain of the power pre-amplifier and the gain of the receiving intermediate frequency circuit of the receiving circuit unit when the ratio of the mixing power signal to the transmitting power signal is the smallest under the condition that the sum of the gain of the power pre-amplifier and the gain of the receiving intermediate frequency circuit of the receiving circuit unit is a fixed value. Adjusting the compensation coefficient of the compensation module, and selecting the compensation coefficient when the ratio of the mirror power signal and the transmitting power signal is the smallest.

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