Calibration link, signal receiving link, electromagnetic wave device and integrated circuit

Abstract

The invention discloses a calibration link, a signal receiving link, an electromagnetic wave device and an integrated circuit. The calibration link is used for calibrating a receiving main path of an echo signal, and the receiving main path comprises a radio frequency unit and an intermediate frequency unit which are sequentially connected with the receiving antenna; wherein the calibration link is integrated in an integrated circuit comprising a receiving main path; wherein the calibration link comprises at least one of a radio frequency auxiliary unit and an intermediate frequency auxiliary unit; wherein the radio frequency auxiliary unit can be configured to calibrate the radio frequency auxiliary unit by transmitting a radio frequency calibration signal; the radio frequency unit is configured to compensate the echo signal received by the receiving antenna and then perform radio frequency signal processing based on the calibration information obtained by the radio frequency auxiliary unit; the intermediate frequency auxiliary unit can be configured to calibrate the intermediate frequency unit by transmitting an intermediate frequency calibration signal, and the intermediate frequency unit can be configured to compensate the intermediate frequency signal output by the radio frequency unit and then process the intermediate frequency signal based on calibration information obtained by the intermediate frequency auxiliary unit.

Description

Technical Field

[0001] This article relates to but is not limited to the field of electromagnetic wave device technology, and in particular to a calibration link, a signal receiving link, an electromagnetic wave device and an integrated circuit. Background Art

[0002] In a frequency modulated continuous wave (FMCW) radar, the frequency difference between the transmitted signal and the echo signal can be used to calculate the distance of the target. The farther the target is, the greater the frequency of the corresponding intermediate frequency signal; and the closer the target is, the smaller the frequency of the corresponding intermediate frequency signal. After receiving multiple continuous pulse signals, the distance information and radial velocity information of the target can be obtained by performing Fourier transform in the fast time and slow time dimensions. In addition, the direction of arrival (DOA) of the echo signal reflected by the target can also be measured through multi-antenna technology.

[0003] In order to improve the parameter estimation performance (such as distance, radial velocity and DoA) of the FMCW radar system, the receiving link needs to be calibrated and compensated. For the calibration of the receiving link, additional equipment can be used to measure the performance of the RF device and make certain compensation. However, this calibration method cannot calibrate the RF device in real time because a large number of peripherals are required, and the RF device parameter indicators will change with changes in the environment. Summary of the invention

[0004] Embodiments of the present application provide a calibration link, a signal receiving link, an electromagnetic wave device, and an integrated circuit.

[0005] A calibration link, the calibration link is used to calibrate a main receiving path of an echo signal, the main receiving path includes a radio frequency unit and an intermediate frequency unit connected to a receiving antenna in sequence; wherein the calibration link is integrated into an integrated circuit including the main receiving path; wherein the calibration link includes at least one of a radio frequency auxiliary unit and an intermediate frequency auxiliary unit; wherein: the radio frequency auxiliary unit is connected between the receiving antenna and the radio frequency auxiliary unit, and can be configured to calibrate the radio frequency auxiliary unit by transmitting a radio frequency calibration signal; correspondingly, the radio frequency unit can be configured to compensate the echo signal received by the receiving antenna based on the calibration information obtained by the radio frequency auxiliary unit, and then perform radio frequency signal processing to obtain an intermediate frequency signal; the intermediate frequency auxiliary unit is connected between the radio frequency unit and the intermediate frequency unit, and can be configured to calibrate the intermediate frequency unit by transmitting an intermediate frequency calibration signal; wherein the intermediate frequency unit can be configured to compensate the intermediate frequency signal output by the radio frequency unit based on the calibration information obtained by the intermediate frequency auxiliary unit, and then perform intermediate frequency signal processing.

[0006] An embodiment of the present application also provides another calibration link, which can be used for calibrating a main receiving path of an echo signal, wherein the main receiving path includes a receiving antenna, a radio frequency unit, and a power detector arranged between the receiving antenna and the radio frequency part; the calibration link includes a radio frequency auxiliary unit; the radio frequency auxiliary unit is connected between the receiving antenna and the power detector in the main path, and is used to calibrate the power detector and / or the radio frequency auxiliary unit by transmitting a calibration signal: wherein the calibration link is integrated in an integrated circuit including the main receiving path, and the radio frequency unit is configured to compensate the echo signal received by the receiving antenna based on the calibration information obtained by the radio frequency auxiliary unit, and then perform radio frequency signal processing.

[0007] Optionally, the main receiving path also includes an intermediate frequency unit, the receiving antenna, the radio frequency unit and the intermediate frequency unit are connected in sequence, and the radio frequency unit is used to perform radio frequency signal processing on the received signal and convert it into an intermediate frequency signal; the calibration link also includes an intermediate frequency auxiliary unit; the intermediate frequency auxiliary unit is connected between the radio frequency unit and the intermediate frequency unit, and is used to calibrate the intermediate frequency unit; wherein the intermediate frequency unit is configured to compensate the intermediate frequency signal output by the radio frequency unit based on the calibration information obtained by the intermediate frequency auxiliary unit and then perform intermediate frequency signal processing.

[0008] Optionally, the RF auxiliary unit is a link composed of IQ devices; wherein the calibrated intermediate frequency unit is also used to calibrate the RF auxiliary unit; and the RF unit is calibrated based on the calibrated RF auxiliary unit.

[0009] Optionally, the radio frequency auxiliary unit and / or the intermediate frequency auxiliary unit includes an analog-to-digital converter DAC, and the analog-to-digital converter DAC is configured to generate a calibration signal.

[0010] A signal receiving link comprises: a main receiving path, which can be configured to receive an echo signal; and a calibration link, which is integrated in a device including the main receiving path and can be configured to calibrate the main receiving path; wherein the main receiving path compensates the echo signal based on calibration information obtained by the calibration link and then performs echo signal processing.

[0011] An electromagnetic wave device comprises at least one signal receiving link; wherein the signal receiving link comprises a main receiving path and a calibration link for receiving electromagnetic wave signals; the main receiving path comprises N signal processing units connected in series, wherein the electromagnetic wave signal passes through the Nth signal processing unit, the N-1th signal processing unit, the N-2th signal processing unit, ... and the first signal processing unit in series; the system comprises auxiliary units corresponding to each signal processing unit, wherein: the first auxiliary unit can be configured to output a simulated first calibration signal to calibrate the first signal unit A calibration operation, wherein the transmission path of the first calibration signal is the first signal processing unit; the nth auxiliary unit can be configured to output a simulated nth calibration signal to perform a calibration operation on the nth signal unit based on the calibrated and compensated 1st to n-1th signal processing units, wherein the transmission path of the nth calibration signal is the 1st to nth signal processing units; each signal processing unit can be configured to perform a signal processing operation after compensating the received signal based on the calibration result of the corresponding auxiliary unit; wherein n=2, 3, ..., N, wherein N is an integer greater than or equal to 2.

[0012] An integrated circuit has two adjacent and spaced-apart receiving main paths and the calibration link described above arranged between the two receiving main paths, wherein the calibration link is shared by the two receiving main paths.

[0013] Since the calibration link is integrated into the integrated circuit including the receiving main path, the calibration link can perform calibration operations on the receiving main path in real time, and the calibration operation of the calibration link can be unaffected by changes in the operating environment of the receiving main path, so that the receiving main path can obtain more accurate calibration information, thereby improving the signal processing performance of the receiving main path.

[0014] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by implementing the present application. Other advantages of the present application can be realized and obtained by the schemes described in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide an understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0016] Figure 1 A schematic diagram of the structure of a calibration link provided in an embodiment of the present application;

[0017] Figure 2 for Figure 1A first structural schematic diagram of an intermediate frequency auxiliary unit in the calibration link shown;

[0018] Figure 3 for Figure 1 A second structural schematic diagram of an intermediate frequency auxiliary unit in the calibration link shown;

[0019] Figure 4 for Figure 1 A schematic diagram of the structure of the radio frequency auxiliary unit in the calibration link shown;

[0020] Figure 5 for Figure 4 A schematic structural diagram of the second signal source shown;

[0021] Figure 6 for Figure 4 Another structural schematic diagram of the radio frequency auxiliary unit shown;

[0022] Figure 7 A schematic diagram of the structure of a signal receiving link provided in an embodiment of the present application;

[0023] Figure 8 for Figure 7 Another structural schematic diagram of the signal receiving link shown;

[0024] Fig. 9 A schematic diagram of the structure of an electromagnetic wave device provided in an embodiment of the present application;

[0025] Fig.10 A schematic diagram of the structure of the main receiving path provided in the embodiment of the present application

[0026] Fig.11 A schematic diagram of the structure of an integrated circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] The present application describes multiple embodiments, but the description is exemplary rather than restrictive, and it is obvious to those skilled in the art that there may be more embodiments and implementations within the scope of the embodiments described in the present application. Although many possible feature combinations are shown in the drawings and discussed in the specific embodiments, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with any other feature or element in any other embodiment, or may replace any other feature or element in any other embodiment.

[0028] The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in the present application may also be combined with any conventional features or elements to form a unique invention scheme. Any features or elements of any embodiment may also be combined with features or elements from other invention schemes to form another unique invention scheme. Therefore, it should be understood that any feature shown and / or discussed in the present application may be implemented individually or in any appropriate combination. Therefore, except for the limitations made according to the attached claims and their equivalents, the embodiments are not subject to other restrictions. In addition, various modifications and changes may be made within the scope of protection of the attached claims.

[0029] In addition, when describing representative embodiments, the specification may have presented the method and / or process as a specific sequence of steps. However, to the extent that the method or process does not rely on the specific order of the steps described herein, the method or process should not be limited to the steps of the specific order described. As will be understood by those of ordinary skill in the art, other sequences of steps are also possible. Therefore, the specific sequence of the steps set forth in the specification should not be interpreted as a limitation to the claims. In addition, the claims for the method and / or process should not be limited to the steps of performing them in the order written, and those skilled in the art can easily understand that these sequences can be changed and still remain within the spirit and scope of the embodiments of the present application.

[0030] Figure 1 This is a schematic diagram of the structure of the calibration link provided in the embodiment of the present application. Figure 1 As shown, the calibration link is used to calibrate the main receiving path of the echo signal, and the main receiving path includes a radio frequency unit and an intermediate frequency unit connected to a receiving antenna in sequence; wherein the calibration link is integrated into an integrated circuit including the main receiving path.

[0031] In the embodiment of the present application, since the calibration link is integrated into the integrated circuit including the main receiving path, the radio frequency device can be calibrated in real time, and no external equipment is required to perform calibration operations on the main receiving path.

[0032] exist Figure 1 In the structure shown, the calibration link includes at least one of a radio frequency auxiliary unit and an intermediate frequency auxiliary unit; wherein:

[0033] The RF auxiliary unit is connected between the receiving antenna and the RF auxiliary unit, and can be configured to calibrate the power detector and / or the RF auxiliary unit by transmitting a RF calibration signal; correspondingly, the RF unit can be configured to compensate the echo signal received by the receiving antenna based on the calibration information obtained by the RF auxiliary unit, and then perform RF signal processing to obtain an intermediate frequency signal.

[0034] Since the calibration link is integrated into the integrated circuit including the main receiving path, the RF auxiliary unit can calibrate the RF unit in real time. In addition, the operating environment of the RF auxiliary unit is the same as that of the RF unit. Therefore, the calibration operation of the RF auxiliary unit may not be affected by changes in the operating environment of the RF unit, so that the RF auxiliary unit can obtain more accurate calibration information, thereby improving the signal processing performance of the RF unit.

[0035] The intermediate frequency auxiliary unit is connected between the radio frequency unit and the intermediate frequency unit, and can be configured to calibrate the intermediate frequency unit by transmitting an intermediate frequency calibration signal; wherein the intermediate frequency unit can be configured to compensate the intermediate frequency signal output by the radio frequency unit based on the calibration information obtained by the intermediate frequency auxiliary unit and then perform intermediate frequency signal processing.

[0036] Since the calibration link is integrated into the integrated circuit including the main receiving path, the intermediate frequency auxiliary unit can calibrate the intermediate frequency unit in real time. In addition, the intermediate frequency auxiliary unit has the same operating environment as the intermediate frequency unit. Therefore, the calibration operation of the intermediate frequency auxiliary unit may not be affected by changes in the operating environment of the intermediate frequency unit, so that the intermediate frequency auxiliary unit can obtain more accurate calibration information, thereby improving the signal processing performance of the intermediate frequency unit.

[0037] The calibration link provided in the embodiment of the present application is integrated into an integrated circuit including the main receiving path, so that the calibration link can perform calibration operations on the main receiving path in real time, and the calibration operation of the calibration link can be unaffected by changes in the operating environment of the main receiving path, so that the main receiving path can obtain more accurate calibration information, thereby improving the signal processing performance of the main receiving path.

[0038] The following is a description of the calibration link provided in the embodiment of the present application:

[0039] In an exemplary embodiment, the main receiving path also includes a power detector (Power Detector, PD) arranged between the receiving antenna and the RF unit; the RF auxiliary unit is connected between the receiving antenna and the power detector, and can be configured to calibrate the power detector by transmitting a RF calibration signal; correspondingly, the power detector can be configured to perform a power detection operation on the echo signal received by the receiving antenna based on the calibration information obtained by the RF auxiliary unit.

[0040] Since the calibration link is integrated into the integrated circuit including the main receiving path, the RF auxiliary unit can calibrate the power detector in real time. In addition, the operating environment of the RF auxiliary unit is the same as that of the power detector. Therefore, the calibration operation of the RF auxiliary unit may not be affected by changes in the operating environment of the power detector, so that the RF auxiliary unit can obtain more accurate calibration information, thereby improving the signal processing performance of the power detector.

[0041] In an exemplary embodiment, when the calibration link includes a radio frequency auxiliary unit and an intermediate frequency auxiliary unit, the calibrated intermediate frequency unit calibrates the radio frequency auxiliary unit; and the calibrated radio frequency auxiliary unit calibrates the radio frequency unit.

[0042] In the above embodiment, when the calibration link includes a radio frequency auxiliary unit and an intermediate frequency auxiliary unit, the receiving path can be calibrated in the following order, including: using the intermediate frequency auxiliary unit to calibrate the intermediate frequency unit; using the calibrated intermediate frequency unit to calibrate the radio frequency auxiliary unit; using the calibrated radio frequency auxiliary unit to calibrate the radio frequency unit.

[0043] Since the calibrated intermediate frequency unit is used to calibrate the RF auxiliary unit, the signal processing performance of the RF auxiliary unit can be improved, and the accuracy of the calibration operation of the RF unit can be improved by calibrating the RF unit using the RF auxiliary unit with improved signal performance.

[0044] In an exemplary embodiment, at least one of the radio frequency calibration signal and the intermediate frequency calibration signal is a single-tone signal. The single-tone signal, also called a single-frequency signal, is a signal with only one constant frequency, which can be a sine signal or a cosine signal. The frequency of the single-tone signal can be set according to the circuit structure receiving the single-tone signal.

[0045] When performing a calibration operation on the main receiving channel, using a single-tone signal as a calibration signal output by the calibration link can reduce the complexity of signal processing in the calibration operation and improve the calibration efficiency.

[0046] Figure 2 for Figure 1 The first structural diagram of the intermediate frequency auxiliary unit in the calibration link is shown. Figure 2 As shown, the intermediate frequency auxiliary unit includes: a first signal source, which can be configured to output a digital intermediate frequency calibration signal; a first real digital-to-analog converter, which can be configured to convert the digital intermediate frequency calibration signal into an analog intermediate frequency calibration signal. The frequency of the intermediate frequency calibration signal can be set according to the frequency of the signal received by the intermediate frequency unit.

[0047] In this embodiment, the digital intermediate frequency calibration signal is generated by the first signal source, which can improve the efficiency of generating the intermediate frequency calibration signal, and then the signal is converted by the first real number digital-to-analog converter to obtain a signal supported by the intermediate frequency unit for reception.

[0048] Figure 3 for Figure 1 The second structural diagram of the intermediate frequency auxiliary unit in the calibration link is shown in FIG. Figure 3 As shown, the intermediate frequency auxiliary unit includes a second real digital-to-analog converter, a first mixer and a first squarer; the second real digital-to-analog converter can be configured to convert a preset digital signal into an analog signal; the first mixer can be configured to mix the signal output by the second real digital-to-analog converter and the local oscillator signal to obtain a mixed signal; the first squarer can be configured to square the mixed signal to obtain the intermediate frequency calibration signal. The number of the second real digital-to-analog converter can be one or at least two.

[0049] In this embodiment, the local oscillator signal is mixed with the signal output by the second real number digital-to-analog converter by using a first mixer to obtain a mixed signal that is approximately a single-tone signal, and then the mixed signal is squared by a first squarer to obtain a single-tone signal as the intermediate frequency calibration signal.

[0050] Figure 4 for Figure 1 The schematic diagram of the structure of the radio frequency auxiliary unit in the calibration link is shown in FIG. Figure 4 As shown, the RF auxiliary unit may include a second signal source, a filtering unit, a power amplifier, and a second mixer, etc. The second signal source may be configured to output a digital original signal; the filtering unit may be configured to filter the original signal to obtain a filtered signal; the power amplifier may be configured to amplify the filtered signal to obtain an amplified signal; and the second mixer may be configured to mix the amplified signal with a local oscillator signal to obtain a desired signal.

[0051] It should be noted that the components in the above-mentioned radio frequency auxiliary unit can also be used to form a signal transmission link.

[0052] Figure 5 for Figure 4 The structural diagram of the second signal source is shown in FIG. Figure 5 As shown, the second signal source includes a direct digital frequency synthesizer and a digital-to-analog converter, etc.; the direct digital frequency synthesizer can be configured to output a digital signal of the initial signal; the digital-to-analog converter can be configured to convert the received signal from a digital signal to an analog signal to obtain the original signal.

[0053] In this embodiment, the digital signal is generated by using a direct digital frequency synthesizer to improve the efficiency of signal generation, and then the signal is converted by a digital-to-analog converter to obtain the signal required by the main receiving channel.

[0054] In some optional embodiments, the digital signal output by the direct digital frequency synthesizer may be an orthogonal signal; and the digital-to-analog converter is a digital-to-analog converter corresponding to the orthogonal signal to form a transmission link of the orthogonal signal.

[0055] In an embodiment, in order to improve the calibration performance of the radio frequency auxiliary unit, the radio frequency auxiliary unit compensates the radio frequency auxiliary unit based on the calibration information obtained by the calibrated intermediate frequency auxiliary unit.

[0056] Figure 6 for Figure 5 Another structural diagram of the radio frequency auxiliary unit is shown in FIG. Figure 6 As shown, the RF auxiliary compensation unit includes at least one of an orthogonal compensation unit, a squarer and an adder. The orthogonal compensation unit is connected to the direct digital frequency synthesizer at one end and to the digital-to-analog converter at the other end, and can be configured to compensate for the orthogonal imbalance of the received initial signal when the initial signal output by the direct digital frequency synthesizer is an orthogonal signal. The second squarer can be connected to the second mixer and can be configured to process the signal output by the second mixer and output it to the calibrated intermediate frequency unit. The adder is connected to the direct digital frequency synthesizer at one end and to the digital-to-analog converter at the other end, and can be configured to compensate for the leakage of the local oscillator signal.

[0057] In an embodiment of the present application, the main receiving path may include a receiving antenna, that is, the receiving antenna may be connected through the peripheral port of the chip and formed on a carrier such as a PCB board. At the same time, in some optional embodiments, the receiving antenna may also be integrated on the chip package to form an AiP (Antenna-In-Package) chip structure, an AoP (Antenna-On-Package) chip structure or an AoC (Antenna-On-Chip) chip structure, that is, a chip structure with a packaged antenna.

[0058] Figure 7 This is a schematic diagram of the structure of the signal receiving link provided in the embodiment of the present application. Figure 7 As shown, the signal receiving link includes: a main receiving path, which can be configured to receive an echo signal; and a calibration link, which is integrated in a device including the main receiving path and can be configured to calibrate the main receiving path; wherein the main receiving path compensates the echo signal based on the calibration information obtained by the calibration link and then performs echo signal processing.

[0059] It should be noted that the above-mentioned calibration link may be any calibration link described in any embodiment of the present application.

[0060] Figure 8 for Figure 7 Another structural diagram of the signal receiving link is shown in FIG. Figure 8 As shown, Figure 8 IFATX corresponds to the intermediate frequency auxiliary unit in the present application, RFATX corresponds to the radio frequency auxiliary unit in the present application, and Receiver corresponds to the main receiving path in the present application.

[0061] IFATX includes a frequency divider and a 1-bit Real ADC, which is used to output the intermediate frequency calibration signal. It can stably generate a single-tone signal in a variety of environments. The single-tone signal can be freely configured to a variety of frequencies. When using IFATX to assist in calibrating the receiver, it needs to be calibrated in advance, including the calibration of the intermediate frequency response and DC calibration. RFATX can be used to output the RF calibration signal.

[0062] Specifically, RFATX includes DDFS, IQ compensation module, adder, IQ digital-to-analog converter, low-pass filter, amplifier, local oscillator and squarer. DDFS can stably generate single-tone signals in a variety of environments, and the single-tone signal can be freely configured to a variety of frequencies. The IQ compensation module is used to solve the problem of ATX IQ imbalance, and then the adder is used to solve the problem of RFATX local oscillator leakage. The squarer module is used to solve the problem of residual sideband caused by ATX IQ imbalance.

[0063] When using RFATX to calibrate the receiving link, it needs to be calibrated in advance, including: calibration of RF ATX local oscillator leakage, calibration of RFATX's RF frequency response, and calibration of RF ATX IQ imbalance. After completing the above calibration items, the stable RFATX can be used to calibrate the receiving link. Single-tone signals of different frequencies are transmitted through ATX, and then the receiving link is calibrated through the baseband signal processing module in the receiving link, including auxiliary calibration of the power detector at the input end of the LNA, the total gain of the receiving link LNA to ADC, and the frequency response.

[0064] Before calibrating the receiving link of RFATX, you can use IFATX to calibrate the intermediate frequency unit. After completing the calibration of the intermediate frequency unit, use the calibrated intermediate frequency unit to calibrate RFATX. After RFATX calibration is completed, use the calibrated RFATX to calibrate the radio frequency unit.

[0065] The main receiving path and the calibration link are integrated in the same chip or the same PCD board or the same PCB board to support real-time detection of the main receiving path.

[0066] In addition, when there is deployment space in the vicinity of the main receiving path, the calibration link can be preferentially deployed as close to the main receiving path as possible to reduce the impact of signal transmission loss and interference on the calibration result.

[0067] The signal receiving link provided in the embodiment of the present application has a calibration link integrated into an integrated circuit including the receiving main path, so that the calibration link can perform calibration operations on the receiving main path in real time, and the calibration operation of the calibration link can be unaffected by changes in the operating environment of the receiving main path, so that the receiving main path can obtain more accurate calibration information, thereby improving the signal processing performance of the receiving main path.

[0068] Fig. 9 This is a schematic diagram of the structure of the electromagnetic wave device provided in the embodiment of the present application. Fig. 9 As shown, the electromagnetic wave device includes at least one main receiving path; wherein the main receiving path includes a main receiving path for receiving electromagnetic wave signals and a calibration link; the main receiving path includes N signal processing units connected in series, wherein the electromagnetic wave signal passes through the Nth signal processing unit, the N-1th signal processing unit, the N-2th signal processing unit, ... and the first signal processing unit in series; the system includes auxiliary units corresponding to each signal processing unit, wherein: the first auxiliary unit can be configured to output a simulated first calibration signal to calibrate the first signal unit A calibration operation, wherein the transmission path of the first calibration signal is the first signal processing unit; the nth auxiliary unit can be configured to output a simulated nth calibration signal to perform a calibration operation on the nth signal unit based on the calibrated and compensated 1st to n-1th signal processing units, wherein the transmission path of the nth calibration signal is the 1st to nth signal processing units; each signal processing unit can be configured to perform a signal processing operation after compensating the received signal based on the calibration result of the corresponding auxiliary unit; wherein n=2, 3, ..., N, wherein N is an integer greater than or equal to 2.

[0069] Since the main receiving path includes multiple functional devices, which may be filters, mixers, amplifiers or digital-to-analog converters for implementing filtering functions, each independent functional device may be used as a signal processing unit, or at least two adjacent functional devices may be used as a signal processing unit.

[0070] Fig.10 This is a schematic diagram of the structure of the main receiving path provided in the embodiment of the present application. Fig.10As shown, the main receiving path includes a plurality of functional devices connected in series in sequence, including: a low noise amplifier (Low Noise Amplifier, LNA), a mixer, a low pass filter (Low Pass Filter, LPF), a high pass filter (High Pass Filter, HPF), a real number analog-to-digital converter (Analog-to-Digital Converter, Real ADC), an adder and a receiving processing module (RF Calib).

[0071] In one implementation, Fig.10 Each functional device in the structure shown serves as a signal processing unit.

[0072] In another implementation, Fig.10 In a part of the functional devices in the structure shown, each functional device is used as a signal processing unit, and in the functional devices in another part, adjacent functional devices are used as a signal processing unit, for example, a low-pass filter (LPF) and a high-pass filter (HPF) are used as a signal processing unit; or, a mixer and a low-noise amplifier (LNA) are used as a signal processing unit, i.e., the RF unit mentioned above, and the low-pass filter (LPF), the high-pass filter (HPF), the real digital-to-analog converter (Real ADC), and the adder are used as another signal processing unit, i.e., the intermediate frequency unit mentioned above.

[0073] In an exemplary embodiment, the calibrated 1st to n-1th signal processing units calibrate the nth auxiliary unit; and the nth auxiliary unit can be configured to calibrate the nth signal processing unit based on the calibration information obtained from the calibrated 1st to n-1th signal processing units.

[0074] Since the auxiliary unit to be used is calibrated using the calibrated signal processing unit, the signal processing performance of the auxiliary unit can be improved, and the signal processing unit is calibrated using the auxiliary unit with improved signal performance, the accuracy of the calibration operation can be improved.

[0075] In the electromagnetic wave device provided in the embodiment of the present application, since the calibration link is integrated into the integrated circuit including the main receiving path, the calibration link can perform calibration operations on the main receiving path in real time, and the calibration operation of the calibration link can be unaffected by changes in the operating environment of the main receiving path, so that the main receiving path can obtain more accurate calibration information, thereby improving the signal processing performance of the main receiving path.

[0076] Fig.11 This is a schematic diagram of the structure of the integrated circuit provided in the embodiment of the present application. Fig.11As shown, the integrated circuit has two adjacent and spaced-apart receiving main paths and any one of the above-mentioned calibration links arranged between the two receiving main paths, wherein the calibration link is shared by the two receiving main paths.

[0077] In the integrated circuit provided by the embodiment of the present application, since the calibration link is integrated into the integrated circuit including the main receiving path, the calibration link can perform calibration operations on the main receiving path in real time, and the calibration operation of the calibration link can be unaffected by changes in the operating environment of the main receiving path, so that the main receiving path can obtain more accurate calibration information, thereby improving the signal processing performance of the main receiving path.

[0078] It will be appreciated by those skilled in the art that all or some of the steps, systems, and functional modules / units in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all components may be implemented as software executed by a processor, such as 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 may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As known to those skilled in the art, the term "computer storage medium" includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are 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, magnetic disk storage or other magnetic storage devices, or any other medium that can be configured to store the desired information and can be accessed by a computer. In addition, it is well known to those skilled in the art that communication media typically contain 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.

Claims

1. A calibration link, characterized in that: The calibration link is used to calibrate a main receiving path of the echo signal, wherein the main receiving path includes a radio frequency unit and an intermediate frequency unit connected to a receiving antenna in sequence; wherein the calibration link is integrated into an integrated circuit including the main receiving path; The calibration link includes at least one of a radio frequency auxiliary unit and an intermediate frequency auxiliary unit; wherein: The radio frequency auxiliary unit is connected between the receiving antenna and the radio frequency auxiliary unit, and can be configured to calibrate the radio frequency auxiliary unit by transmitting a radio frequency calibration signal; Correspondingly, the radio frequency unit may be configured to compensate the echo signal received by the receiving antenna based on the calibration information obtained by the radio frequency auxiliary unit, and then perform radio frequency signal processing to obtain an intermediate frequency signal; The intermediate frequency auxiliary unit is connected between the radio frequency unit and the intermediate frequency unit, and can be configured to calibrate the intermediate frequency unit by transmitting an intermediate frequency calibration signal; The intermediate frequency unit may be configured to perform intermediate frequency signal processing after compensating the intermediate frequency signal output by the radio frequency unit based on the calibration information obtained by the intermediate frequency auxiliary unit.

2. The calibration link according to claim 1, characterized in that: The main receiving path also includes a power detector arranged between the receiving antenna and the radio frequency unit; The radio frequency auxiliary unit is connected between the receiving antenna and the power detector and can be configured to calibrate the power detector by transmitting a radio frequency calibration signal; Correspondingly, the power detector may be configured to perform a power detection operation on the echo signal received by the receiving antenna based on the calibration information obtained by the radio frequency auxiliary unit.

3. The calibration link according to claim 1, wherein: When the calibration link includes a radio frequency auxiliary unit and an intermediate frequency auxiliary unit, the calibrated intermediate frequency unit calibrates the radio frequency auxiliary unit; And, the calibrated radio frequency auxiliary unit calibrates the radio frequency unit.

4. The calibration link according to claim 1, wherein: At least one of the radio frequency calibration signal and the intermediate frequency calibration signal is a single-tone signal.

5. The calibration link according to any one of claims 1 to 4, characterized in that: The intermediate frequency auxiliary unit comprises: A first signal source may be configured to output a digital intermediate frequency calibration signal; The first real digital-to-analog converter may be configured to convert the digital intermediate frequency calibration signal into an analog intermediate frequency calibration signal.

6. The calibration link according to any one of claims 1 to 4, characterized in that: The intermediate frequency auxiliary unit comprises: A second real digital-to-analog converter may be configured to convert a preset digital signal into an analog signal; The first mixer may be configured to perform mixing processing on the signal output by the second real digital-to-analog converter and the local oscillator signal to obtain a mixed signal; The first squarer may be configured to square the mixed signal to obtain the intermediate frequency calibration signal.

7. The calibration link according to any one of claims 1 to 4, characterized in that: The radio frequency auxiliary unit comprises: A second signal source may be configured to output a digital original signal; A filtering unit may be configured to filter the original signal to obtain a filtered signal; A power amplifier may be configured to amplify the filtered signal to obtain an amplified signal; The second mixer may be configured to perform mixing processing on the amplified signal using a local oscillator signal to obtain a desired signal.

8. The calibration link according to claim 7, characterized in that: The second signal source comprises: A direct digital frequency synthesizer, configurable to output a digital signal of an initial signal; The digital-to-analog converter may be configured to convert the received signal from a digital signal to an analog signal to obtain the original signal.

9. The calibration link according to claim 8, characterized in that: The digital signal output by the direct digital frequency synthesizer is an orthogonal signal; The digital-to-analog converter is a digital-to-analog converter corresponding to an orthogonal signal.

10. The calibration link according to claim 7, characterized in that: The radio frequency auxiliary compensation unit includes at least one of an orthogonal compensation unit, a squarer, and an adder, wherein: an orthogonal compensation unit, one end of which is connected to the direct digital frequency synthesizer and the other end of which is connected to the digital-to-analog converter, and which can be configured to compensate for the orthogonal imbalance of the received initial signal when the initial signal output by the direct digital frequency synthesizer is an orthogonal signal; a second squarer, connected to the second mixer, and configured to process the signal output by the second mixer and output the signal to the calibrated intermediate frequency unit; An adder, one end of which is connected to the direct digital frequency synthesizer and the other end of which is connected to the digital-to-analog converter, can be configured to compensate for the leakage of the local oscillator signal.

11. A calibration link, characterized in that: Applied to calibrate a main receiving path of an echo signal, the main receiving path comprising a receiving antenna, a radio frequency unit, and a power detector arranged between the receiving antenna and the radio frequency part; The calibration link includes a radio frequency auxiliary unit; The radio frequency auxiliary unit is connected between the receiving antenna and the power detector in the main path, and is used to calibrate the power detector and / or the radio frequency auxiliary unit by transmitting a calibration signal: The calibration link is integrated into an integrated circuit including the main receiving path, and the radio frequency unit is configured to perform radio frequency signal processing after compensating the echo signal received by the receiving antenna based on the calibration information obtained by the radio frequency auxiliary unit.

12. The calibration link of claim 11, wherein: The main receiving path also includes an intermediate frequency unit, the receiving antenna, the radio frequency unit and the intermediate frequency unit are connected in sequence, and the radio frequency unit is used to perform radio frequency signal processing on the received signal and convert it into an intermediate frequency signal; The calibration link also includes an intermediate frequency auxiliary unit; The intermediate frequency auxiliary unit is connected between the radio frequency unit and the intermediate frequency unit, and is used to calibrate the intermediate frequency unit; The intermediate frequency unit is configured to perform intermediate frequency signal processing after compensating the intermediate frequency signal output by the radio frequency unit based on the calibration information obtained by the intermediate frequency auxiliary unit.

13. The calibration link of claim 12, wherein: The radio frequency auxiliary unit is a link composed of IQ devices; The calibrated intermediate frequency unit is also used to calibrate the radio frequency auxiliary unit; and The radio frequency unit is calibrated based on the calibrated radio frequency auxiliary unit.

14. The calibration link according to any one of claims 11 to 13, characterized in that: The radio frequency auxiliary unit and / or the intermediate frequency auxiliary unit comprises an analog-to-digital converter DAC, and the analog-to-digital converter DAC is configured to generate a calibration signal.

15. A signal receiving link, characterized in that: include: A receiving main channel can be configured to receive echo signals; as well as a calibration link, integrated in a device including the receiving main path, and configurable to calibrate the receiving main path; The main receiving channel compensates the echo signal based on the calibration information obtained from the calibration link and then processes the echo signal.

16. The signal receiving link according to claim 15, characterized in that: The calibration link is the calibration link according to any one of claims 1 to 10.

17. The signal receiving link according to claim 15 or 16, characterized in that: The main receiving path and the calibration link are integrated in the same chip or the same PCD board or the same PCB board.

18. An electromagnetic wave device, characterized in that: The invention comprises at least one signal receiving link; wherein the signal receiving link comprises a main receiving path and a calibration link for receiving electromagnetic wave signals; the main receiving path comprises N signal processing units connected in series in sequence, wherein the electromagnetic wave signal passes through the Nth signal processing unit, the N-1th signal processing unit, the N-2th signal processing unit, ... and the first signal processing unit in series in sequence; The system comprises an auxiliary unit corresponding to each signal processing unit, wherein: The first auxiliary unit may be configured to output a simulated first calibration signal to perform a calibration operation on the first signal unit, wherein a transmission path of the first calibration signal is the first signal processing unit; The nth auxiliary unit may be configured to output a simulated nth calibration signal to perform a calibration operation on the nth signal unit based on the calibrated and compensated 1st to n-1th signal processing units, wherein the transmission path of the nth calibration signal is the 1st to nth signal processing units; Each signal processing unit may be configured to perform signal processing operations after compensating the received signal based on the calibration results of the respective corresponding auxiliary units; Wherein, n=2, 3, ..., N, where N is an integer greater than or equal to 2.

19. The electromagnetic wave device according to claim 18, characterized in that: The calibrated 1st to n-1th signal processing units calibrate the nth auxiliary unit; and the nth auxiliary unit can be configured to calibrate the nth signal processing unit based on the calibration information obtained from the calibrated 1st to n-1th signal processing units.

20. An integrated circuit, characterized in that: The integrated circuit comprises two adjacent and spaced-apart receiving main paths and a calibration link according to any one of claims 1 to 14 arranged between the two receiving main paths, wherein the calibration link is shared by the two receiving main paths.

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