Interference cancellation circuit and parameter calibration method

Abstract

The invention discloses an interference elimination circuit and a parameter calibration method, and the interference elimination circuit is applied to a communication and inductance integrated system, and comprises a first port, a second port, and a transmitting feed module. The first port is connected with a transmitting port of a chip, the second port is connected with a receiving port of the chip, the transmitting feed module comprises a third port and a fourth port, the third port is connected with the first port, and the fourth port is connected with the second port; the first port is used for receiving a transmitting signal from a transmitting port of the chip; the transmitting feed module is used for performing amplitude modulation and / or phase shift on a transmitting signal to generate a first signal, and inputting the first signal to the second port through a fourth port; the second port is used for outputting the first signal; wherein the first signal is transmitted to a receiving port of the chip and is used for offsetting an interference signal of the receiving port of the chip. By adopting the embodiment of the invention, the interference of the interference signal on the received signal can be reduced.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to an interference elimination circuit and a parameter calibration method. Background Art

[0002] An integrated sensing and communication (ISAC) system refers to a system that has both communication and perception functions, and can also be called an ISAC system.

[0003] Exemplarily, the synaesthesia system may include a chip and an antenna, the chip is used to output a transmission signal, the antenna is used to transmit the transmission signal, and receive the echo signal (i.e., the received signal) of the target, and the chip is also used to compare the waveform of the received signal with the transmission signal to obtain target information, thereby realizing the perception function. Exemplarily, the synaesthesia system may adopt a single antenna architecture or a dual antenna architecture. When the synaesthesia system adopts a dual antenna architecture, the antenna may include a transmitting (transmitter, Tx) antenna and a receiving (receiver, Rx) antenna, which are respectively used to transmit the transmission signal and receive the reception signal.

[0004] However, in addition to the received signal, the signal received by the Tongganyi system also includes interference signals, such as the direct path interference signal received by the receiving antenna directly after the transmitting antenna transmits, the coupling interference signal between the transmitting antenna and the receiving antenna feeder, the coupling interference signal in the RF and IF parts of the chip, and the coupling interference signal between the chip pins, etc. These interference signals are often much larger than the received signal and are similar to the received signal, making it difficult to separate the signals and causing serious interference to target detection. Summary of the invention

[0005] The embodiment of the present application discloses an interference elimination circuit and a parameter calibration method, which can reduce the interference of interference signals on received signals, facilitate the separation of received signals, and facilitate the detection of targets at longer distances and with greater precision.

[0006] In the first aspect, an embodiment of the present application provides an interference elimination circuit, which is applied to a synaesthesia system, comprising a first port, a second port, and a transmitting feed module; the first port is connected to the transmitting port of the chip, the second port is connected to the receiving port of the chip, and the transmitting feed module comprises a third port and a fourth port, the third port is connected to the first port, and the fourth port is connected to the second port; the first port is used to receive a transmitting signal from the transmitting port of the chip; the transmitting feed module is used to amplitude modulate and / or phase shift the transmitting signal to generate a first signal, and input the first signal to the second port through the fourth port; the second port is used to output the first signal; wherein the first signal is transmitted to the receiving port of the chip to offset the interference signal of the receiving port of the chip.

[0007] In the embodiment of the present application, the interference elimination circuit can be applied to the interawareness system, and can also be applied to the single antenna radar system. The interference elimination circuit can be arranged between the chip and the antenna of the interawareness system, and is used to eliminate the interference signal received by the chip. Since the interference signal received by the receiving port of the chip is generated by the coupling of the transmission signal, it has the same frequency as the transmission signal, and the amplitude and phase may be different. Therefore, the transmitting feed module obtains the first signal that can offset the interference signal by amplitude modulation and / or phase modulation of the transmission signal. The signal received by the receiving port of the chip includes a receiving signal, a first signal and an interference signal, and the receiving signal is the echo signal of the target received by the antenna. The first signal cancels the interference signal, that is, the power of the superimposed signal of the first signal and the interference signal is less than the power of the interference signal, thereby reducing the interference of the interference signal to the received signal, which is conducive to the separation of the received signal, so as to facilitate the detection of more precise targets at a longer distance.

[0008] In combination with the first aspect, in a possible implementation, the transmitting feed module includes an attenuated phase shifting module and a directional coupling module, the attenuated phase shifting module and the directional coupling module are connected in series or in parallel, the attenuated phase shifting module is used to perform amplitude modulation and / or phase modulation on the transmitting signal, and the directional coupling module is used to separate the transmitting signal from the receiving signal.

[0009] In an embodiment of the present application, forward and backward signal separation is performed through a directional coupling module to achieve separation of the transmit signal and the receive signal, so that the chip can transmit and receive signals at the same time, and the transmit signal is amplitude modulated and / or phase modulated through an attenuation phase shifting module to generate a signal for the interference signal, thereby reducing interference.

[0010] In combination with the first aspect, in a possible implementation, the transmitting feed module includes an attenuated phase shifting module and a directional coupling module, the directional coupling module includes a fifth port and a sixth port; the input port of the attenuated phase shifting module is connected to the third port, the output port of the attenuated phase shifting module is connected to the fifth port, and the fourth port is connected to the sixth port; the attenuated phase shifting module is used to perform amplitude modulation and / or phase shifting on the transmitting signal to generate a second signal, and output the second signal to the directional coupling module; the directional coupling module is used to generate the first signal according to the second signal, and output the first signal to the fourth port through the sixth port; the fourth port is used to output the first signal.

[0011] In the embodiment of the present application, after the directional coupling module receives the second signal through the fifth port, it generates the first signal at the sixth port. The fifth port can also be called the incident port of the second signal, and the sixth port can also be called the isolation port of the second signal. The attenuation phase shifting module is connected in series with the directional coupling module, and the amplitude and / or phase of the second signal can be adjusted through the attenuation phase shifting module, thereby indirectly adjusting the amplitude and / or phase of the first signal, so that the first signal can offset the interference signal. It can be understood that the embodiment of the present application can reasonably use the signal generated by the isolation port when the directional coupler transmits the transmission signal to offset the interference signal, thereby making the interference elimination operation simpler.

[0012] In combination with the first aspect, in a possible implementation, the transmitting feed module includes an attenuated phase shifting module and a directional coupling module, the directional coupling module includes a fifth port and a sixth port; the input port of the attenuated phase shifting module is connected to the third port, the output port of the attenuated phase shifting module is connected to the fourth port, the fifth port is connected to the third port, and the sixth port is connected to the fourth port; the attenuated phase shifting module is used to perform amplitude modulation and / or phase shifting on the transmitting signal to generate a third signal, and transmit the third signal to the fourth port; the directional coupling module is used to generate a fourth signal based on the transmitting signal, and transmit the fourth signal to the fourth port; the fourth port is used to output the first signal, and the first signal is composed of the third signal and the fourth signal.

[0013] In an embodiment of the present application, after the directional coupling module receives the transmission signal through the fifth port, the fourth signal is generated at the sixth port. The fifth port can also be referred to as the incident port of the transmission signal, and the sixth port can also be referred to as the isolation port of the transmission signal. The attenuation phase shifting module is connected in parallel with the directional coupling module to respectively generate a third signal and a fourth signal for offsetting the interference signal, and the first signal received by the fourth port is the superposition signal of the third signal and the fourth signal. The amplitude and phase of the third signal can be adjusted by the attenuation phase shifting module so that the first signal can offset the interference signal. It can be understood that the embodiment of the present application can reasonably use the signal generated by the isolation port when the directional coupler transmits the transmission signal to offset the interference signal, thereby making the interference elimination operation easier.

[0014] In combination with the first aspect, in a possible implementation, the circuit also includes a seventh port, and the directional coupling module also includes an eighth port; the seventh port is connected to the antenna, and the eighth port is connected to the seventh port; the directional coupling module is also used to generate a fifth signal based on the second signal or the transmit signal, and output the fifth signal to the seventh port through the eighth port; the seventh port is used to output the fifth signal, and the fifth signal is transmitted to the antenna.

[0015] In the embodiment of the present application, the eighth port is a coupling port for the second signal or the transmission signal. After the directional coupling module receives the second signal or the transmission signal through the fifth port, it outputs the fifth signal through the eighth port. After the seventh port receives the fifth signal from the fifth port, it transmits the fifth signal to the antenna so that the antenna transmits the fifth signal, thereby realizing signal transmission.

[0016] In combination with the first aspect, in a possible implementation, the circuit also includes a matching module, the eighth port is connected to the seventh port through the matching module, the matching module includes a ninth port and a tenth port, the ninth port is connected to the eighth port, and the tenth port is connected to the seventh port; the matching module is used to receive the fifth signal through the ninth port, output a reflected signal through the ninth port, and output the fifth signal to the seventh port through the tenth port; the directional coupling module is also used to output the reflected signal to the fourth port through the sixth port; the fourth port is also used to output the reflected signal, and the reflected signal is used to offset the interference signal.

[0017] In an embodiment of the present application, the matching module is used to perform impedance matching. After the ninth port of the matching module receives the fifth signal, the fifth signal is emitted in the matching module to generate a reflection signal, and the reflection signal is output through the ninth port. The reflection signal is transmitted to the eighth port through the ninth port. The directional coupling module transmits the reflection signal to the fourth port through the sixth port, and the fourth port transmits the reflection signal to the second port, and the second port outputs the reflection signal so that the reflection signal is transmitted to the receiving port of the chip. The embodiment of the present application uses the reflection signal and the first signal to offset the interference signal, so as to better eliminate interference.

[0018] In combination with the first aspect, in a possible implementation manner, the matching module includes at least one variable capacitor or at least one variable resistor, and the at least one variable capacitor or at least one variable resistor is used to adjust the phase of the reflected signal.

[0019] In the embodiment of the present application, the phase of the reflected signal can be adjusted by adjusting the value of at least one variable capacitor or at least one variable resistor, so that the reflected signal can better offset the interference signal.

[0020] In combination with the first aspect, in a possible implementation manner, the power of the reflected signal is determined by a reflection coefficient of the ninth port.

[0021] In the embodiment of the present application, the power or amplitude of the reflected signal is determined by the reflection coefficient of the ninth port, that is, the power or amplitude of the reflected signal can be adjusted by changing the reflection coefficient of the ninth port, so that the reflected signal can better offset the interference signal.

[0022] In combination with the first aspect, in a possible implementation, the seventh port is also used to receive a received signal from the antenna and output the received signal to the eighth port, and the received signal is a signal received by the antenna; the directional coupling module is also used to receive the received signal through the eighth port, and output the received signal to the fourth port through the sixth port; the fourth port is also used to output the received signal.

[0023] In the embodiment of the present application, the received signal is an echo signal of a target received by the antenna. For example, the received signal may be an echo signal of the fifth signal reflected by the target after the antenna transmits the fifth signal. The eighth port is the incident port of the received signal, and the sixth port is the through port of the received signal. Therefore, the received signal can be transmitted to the receiving port of the chip through the directional coupling module, so that the transmission signal and the reception signal can be isolated through the directional coupling module, and the transmission and reception can be turned on at the same time.

[0024] In combination with the first aspect, the circuit further includes a first switch and a second switch, the first switch includes a first fixed end, a first movable end and a second movable end, the second switch includes a second fixed end, a third movable end and a fourth movable end; the first fixed end is connected to the third port, the first movable end is connected to the first port, and the second movable end is connected to a reference ground; the second fixed end is connected to the fourth port, the third movable end is connected to the second port, and the fourth movable end is connected to the first port;

[0025] The directional coupling module is also used to transmit a receiving signal to the second port when the first fixed end is connected to the second moving end and the second fixed end is connected to the third moving end, and the second port is used to output the receiving signal; wherein the receiving signal is a signal received by the seventh port from the antenna; or,

[0026] The directional coupling module is further configured to transmit the transmission signal to the seventh port when the first fixed end is connected to the second movable end, and the second fixed end is connected to the fourth movable end.

[0027] In the embodiment of the present application, when the first fixed end is connected to the second movable end, and the second fixed end is connected to the third movable end, the path between the directional coupling module and the receiving port of the chip is turned on by the second switch, the chip is in the communication receiving mode, the eighth port is the incident port of the received signal, and the sixth port is the passing port of the received signal. Therefore, after the antenna receives the received signal, the received signal can be transmitted to the receiving port of the chip through the seventh port, the directional coupling module, and the second port.

[0028] When the first fixed end is connected to the second movable end, and the second fixed end is connected to the fourth movable end, the path between the directional coupling module and the transmitting port of the chip is turned on by the second switch, and the chip processes the communication transmission mode, the sixth port is the transmission signal incident port, and the eighth port is the transmission signal passing port. Therefore, after the transmitting port of the chip outputs the transmission signal, the transmission signal is transmitted to the seventh port through the directional coupling module, and the seventh port transmits the transmission signal to the antenna, so that the antenna transmits the transmission signal. The embodiment of the present application disconnects the path between the transmitting port of the chip and the attenuation phase shift module through the first switch, so that the chip is not affected by the attenuation phase shift module in the communication transmission mode or the communication reception mode, thereby ensuring the stability of the communication performance of the chip.

[0029] In combination with the first aspect, in a possible implementation manner, the power of the fifth signal is determined by the power of the second signal or the transmit signal and a coupling coefficient of the directional coupling module.

[0030] In combination with the first aspect, in a possible implementation manner, the isolation coefficient of the directional coupling module is determined by the self-coupling coefficient of the chip.

[0031] In the embodiment of the present application, the interference signal includes a signal generated by the self-coupling of the chip, that is, the power or amplitude of the interference signal is determined by the self-coupling coefficient of the chip and the power or amplitude of the transmitted signal, and the power or amplitude of the first signal is determined by the isolation coefficient of the directional coupling module and the power or amplitude of the transmitted signal. Therefore, the isolation coefficient of the directional coupling module can be determined by the self-coupling coefficient of the chip, so that the first signal can better offset the interference signal.

[0032] In combination with the first aspect, in a possible implementation, the attenuation phase shifting module includes an attenuator and a phase shifter, the attenuator and the phase shifter are connected in series, the attenuator is used to amplitude modulate the transmit signal, and the phase shifter is used to phase modulate the transmit signal.

[0033] In combination with the first aspect, in a possible implementation manner, the power of the first signal is determined by the power of the transmitted signal and the isolation coefficient of the directional coupling module.

[0034] In combination with the first aspect, in a possible implementation manner, the interference signal includes at least one of the following: a transmission-reception coupling interference signal of the chip, and a direct path interference signal received by the antenna after the antenna transmits a signal.

[0035] In a second aspect, an embodiment of the present application provides a parameter calibration method, which is applied to a controller, wherein the controller is connected to an interference elimination circuit, which is used to eliminate interference signals of a chip, and the method comprises: obtaining a first gradient value of a first parameter, wherein the first gradient value is used to indicate the degree of influence of the first parameter on the power of the interference signal, and the first parameter is a parameter in the interference elimination circuit; adjusting the value of the first parameter according to the first gradient value until the power of the interference signal meets a first condition.

[0036] In the embodiment of the present application, the interference signal is a signal other than the received signal in the signal received by the chip, and the received signal is a signal received by the antenna. The controller gradually adjusts the parameters in the interference elimination circuit according to the first gradient value so that the interference elimination circuit can better eliminate the interference signal of the chip. That is, the controller gradually adjusts the parameters in the interference elimination circuit according to the first gradient value, and gradually reduces the power of the interference signal until the power of the interference signal meets the demand.

[0037] In combination with the second aspect, in a possible implementation manner, the first condition includes that the power of the interference signal is less than a first threshold.

[0038] In the embodiment of the present application, the first threshold can be determined according to the business requirements or capabilities of the chip. By adjusting the value of the first parameter, the interference signal power of the chip is less than the first threshold, so that the interference of the chip can meet the requirements, for example, the chip can separate the interference signal from the received signal.

[0039] In combination with the second aspect, in a possible implementation method, obtaining the first gradient value of the first parameter includes: when the first parameter is a first value, controlling the chip to output a first transmit signal, and obtaining a first power value of an interference signal corresponding to the first transmit signal; when the first parameter is a second value, controlling the chip to output a second transmit signal, and obtaining a second power value of the interference signal corresponding to the second transmit signal; and determining the first gradient value based on the first value, the second value, the first power value, and the second power value.

[0040] In the embodiment of the present application, by obtaining the value of the adjusted first parameter, the power values ​​of the interference signal when the first parameter takes different values ​​are obtained respectively, so that the influence of the first parameter on the power of the interference signal can be accurately obtained.

[0041] In combination with the second aspect, in a possible implementation, the interference elimination circuit includes at least one of an attenuation phase shift module, a directional coupling module, and a matching module, and the first parameter includes at least one of the following: the attenuation amount of the attenuation phase shift module, the phase shift amount of the attenuation phase shift module, and the phase shift amount of the matching module.

[0042] In combination with the second aspect, in a possible implementation manner, the method further includes: saving the value of the first parameter.

[0043] In an embodiment of the present application, after the controller adjusts the first parameter so that the power of the interference signal meets the first condition, the value of the first parameter is saved, so that the value of the first parameter can be used in the subsequent process of the chip receiving the transmission signal so that the interference signal of the chip meets the first condition without repeating the calibration and adjustment of the parameters.

[0044] In a third aspect, an embodiment of the present application provides a chip, comprising a packaging substrate and a bare chip, the bare chip being provided with an interference elimination circuit as described in the first aspect and any possible implementation of the first aspect, and the packaging substrate being used to package the bare chip.

[0045] In a fourth aspect, an embodiment of the present application provides a wireless transceiver system, wherein the wireless transceiver includes a chip, an antenna, and an interference elimination circuit as described in the first aspect and any possible implementation of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The following is an introduction to the drawings related to the embodiments of the present application.

[0047] Figure 1A-Figure 1C It is a structural schematic diagram of a synaesthesia integrated system provided in an embodiment of the present application;

[0048] Figure 2 This is a schematic diagram of a communication scenario of a synaesthesia system provided in an embodiment of the present application;

[0049] Figure 3 It is a structural diagram of a system with a single antenna architecture provided in an embodiment of the present application;

[0050] Figure 4 is a structural schematic diagram of an interference elimination circuit provided in an embodiment of the present application;

[0051] Figure 5 is a structural schematic diagram of a directional coupling module provided in an embodiment of the present application;

[0052] Figure 6 is a structural schematic diagram of an attenuation phase shifting module provided in an embodiment of the present application;

[0053] Figure 7 is a structural schematic diagram of another interference elimination circuit provided in an embodiment of the present application;

[0054] Figure 8A-8C is a structural schematic diagram of another interference elimination circuit provided in an embodiment of the present application;

[0055] Fig. 9 is a structural schematic diagram of another interference elimination circuit provided in an embodiment of the present application;

[0056] Fig.10 is a structural schematic diagram of another interference elimination circuit provided in an embodiment of the present application;

[0057] Figures 11A-11C is a structural schematic diagram of another interference elimination circuit provided in an embodiment of the present application;

[0058] Fig.12 It is a flow chart of a parameter calibration method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0059] In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0060] The terms "first" and "second" in the specification, claims and drawings of this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0061] The "embodiment" mentioned in this article means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It can be explicitly and implicitly understood by those skilled in the art that in the various embodiments of the present application, if there is no special explanation and logical conflict, the terms and / or descriptions between the various embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0062] It should be understood that in the present application, "at least one (item)" means one or more, "more than one" means two or more, "at least two (items)" means two or three and more than three, and "and / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0063] The communication and perception integrated system refers to a system that has both communication and perception functions, and can also be called a synaesthesia integrated system, such as a WIFI radar integrated system. The synaesthesia integrated system can use a radar architecture to realize the perception function, that is, the transmission and reception are turned on at the same time. Exemplarily, the chip is used to output a transmission signal, the antenna is used to transmit the transmission signal, and receive the echo signal (i.e., the received signal) of the target. The chip is also used to compare the waveform of the received signal with the transmission signal to obtain target information, thereby realizing the perception function.

[0064] like Figure 1AAs shown, the synaesthesia system can adopt a dual-chip dual-antenna architecture, including two chips (respectively chip 1 and chip 2) and two antennas (respectively a transmitting antenna and a receiving antenna). Among them, chip 1 can be used as a transmitting chip for outputting a transmitting signal. The transmitting antenna is connected to the chip 1 for transmitting a transmitting signal. The receiving antenna is used to receive a receiving signal. Chip 1 can be used as a receiving chip, connected to the receiving antenna, for receiving the receiving signal.

[0065] like Figure 1B As shown, the synaesthesia system can adopt a single-chip dual-antenna architecture, including a chip and two antennas (a transmitting antenna and a receiving antenna). The transmitting antenna and the receiving antenna are connected to the chip, the chip is used to output a transmitting signal, the transmitting antenna is used to transmit the transmitting signal, the receiving antenna is used to receive the receiving signal, and the chip is also used to receive the receiving signal.

[0066] like Figure 1C As shown, the synaesthesia system can adopt a single-chip single-antenna architecture, including a chip and an antenna, that is, the receiving antenna and the transmitting antenna are the same antenna, and signal reception and transmission are achieved through one antenna.

[0067] Exemplarily, the working modes of the synaesthesia system may include a perception mode (or radar mode) and a communication mode. In the radar mode, the synaesthesia system simultaneously receives and transmits signals through the antenna. The communication mode may include a communication reception mode and a communication transmission mode. In the communication reception mode, the synaesthesia system receives signals through the antenna but does not transmit signals. In the communication transmission mode, the synaesthesia system transmits signals through the antenna but does not receive signals. Exemplarily, the time of the radar mode and the communication mode of the synaesthesia system are different, that is, the communication-synaesthesia system has the characteristics of radar and communication at the same frequency but at different times, which can be called a time-division synaesthesia system. Figure 2 As shown, the synesthesia system can determine the time of radar mode and the time of communication mode according to the actual usage scenario. Figure 2 , the radar mode and the communication mode are alternately shown in FIG. 1 , and the synesthesia system can also continuously transmit communication frames or continuously transmit radar frames. It can be understood that the power of the signal in the radar mode and the communication mode can be the same or different.

[0068] In a system with a single antenna architecture, it is necessary to separate the forward and backward signals (i.e., the transmit signal and the receive signal) to achieve isolation of the transmit signal from the receive signal. For example, the system can use a circulator to achieve forward and backward signal separation. Figure 3As shown, the transmit signal can be transmitted to the antenna array through the bias device, the coupler, and the circulator, and the transmit signal is transmitted by the antenna array. After receiving the receive signal, the antenna array transmits the receive signal to the mixer through the circulator, and the mixer mixes the receive signal with the transmit signal, thereby separating the transmit signal from the receive signal.

[0069] In the above-mentioned synaesthesia system, the signals received by the synaesthesia system include interference signals in addition to echoes, such as direct path interference signals directly received by the receiving antenna after being transmitted by the transmitting antenna, and coupled interference signals between the transmitting antenna and the receiving antenna feeder. In a system with a single-chip architecture, interference signals also include coupled interference signals in the RF and IF parts of the chip and coupled interference signals between the chip pins. The above-mentioned interference signals are generated by the coupling of the transmitting signal and can also be called T-Rx path self-blocking signals. In general, the interference signal is much larger than the receiving signal and is similar to the receiving signal, resulting in high difficulty in signal separation, which seriously interferes with the detection of targets at longer distances and finer precision. Moreover, in a system with a single antenna architecture, when the forward and backward signals are separated by a circulator, the circulator cannot be effectively miniaturized and built-in on the chip, the cost is high, and the isolation of the circulator is limited, and the transmission signal and the receiving signal cannot be separated well.

[0070] In view of this, the embodiments of the present application provide an interference elimination circuit and a parameter calibration method, which can reduce the interference of interference signals on received signals, facilitate the separation of received signals, and facilitate the detection of targets at longer distances and with greater precision.

[0071] See also Figure 4 , Figure 4 1 is a schematic diagram of the structure of an interference elimination circuit provided in an embodiment of the present application. The interference elimination circuit can be applied to a synaesthesia system, or the interference elimination circuit can also be applied to a single antenna radar system. It is understood that the description of the synaesthesia system can refer to the relevant description above, and will not be described in detail here. Figure 4 As shown, the interference elimination circuit can be arranged between the chip and the antenna to eliminate the interference signal received by the receiving port of the chip. The interference elimination circuit includes a first port, a second port and a transmitting feed module. The first port is connected to the transmitting port of the chip, the second port is connected to the receiving port of the chip, and the transmitting feed module includes a third port and a fourth port, the third port is connected to the first port, and the fourth port is connected to the second port.

[0072] The first port is used to receive a transmission signal from the transmission port of the chip. The transmission feed module is used to perform amplitude modulation and / or phase shifting on the transmission signal to generate a first signal, and input the first signal to the second port through the fourth port. The second port is used to output the first signal. The first signal is transmitted to the receiving port of the chip to offset the interference signal of the receiving port of the chip.

[0073] Exemplarily, the interference signal received by the receiving port of the chip is generated by coupling with the transmitting signal, has the same frequency as the transmitting signal, and may be different in amplitude and phase. For example, the interference signal includes at least one of the following: the chip's transmitting and receiving coupled interference signal, and the direct path interference signal received by the antenna after the antenna transmits the signal. Among them, the chip's transmitting and receiving coupled interference signal can also be called the chip package coupled interference signal, including the coupled interference signal in the RF and IF parts of the chip and the coupled interference signal between the chip pins.

[0074] The transmitting feed module can generate a first signal by performing amplitude modulation or phase modulation on the transmitting signal, so that the first signal can offset the interference signal, that is, the power of the superimposed signal of the first signal and the interference signal is less than the power of the interference signal. For example, the first signal is opposite to the interference signal in phase, and the amplitude of the first signal is less than or equal to the amplitude of the interference signal.

[0075] In an embodiment of the present application, the signal received by the receiving port of the chip includes a first signal, a receiving signal and an interference signal, and the receiving signal is an echo signal of the target received by the antenna. Since the interference signal is generated by coupling the transmitting signal, it has the same frequency as the transmitting signal, but the amplitude and phase may be different. Therefore, the transmitting feed module obtains a first signal that can offset the interference signal by performing amplitude modulation and / or phase modulation on the transmitting signal, thereby reducing the interference of the interference signal on the receiving signal, which is beneficial to the separation of the receiving signal, so as to facilitate the detection of targets at a longer distance and more precisely.

[0076] In a possible implementation, the transmitting feed module includes an attenuated phase shifting module and a directional coupling module. The attenuated phase shifting module and the directional coupling module are connected in series or in parallel. The attenuated phase shifting module is used to perform amplitude modulation and / or phase modulation on the transmitting signal. The directional coupling module is used to separate the transmitting signal from the receiving signal, that is, the directional coupling module is used to perform forward and backward signal separation.

[0077] Exemplarily, the directional coupling module may also be referred to as a directional coupler or a directional coupling transmitting and feeding module. Figure 5As shown, the directional coupling module may include two wires (respectively a first wire and a second wire) and four ports (respectively port 1, port 2, port 3 and port 4). Among them, port 1 and port 2 are on the first wire, and port 3 and port 4 are on the second wire. The length of the first wire and the second wire can be set to one quarter of the wavelength of the transmitted signal. The directional coupling module can achieve forward and backward separation of the signal through mutual coupling between the two wires, and separation of the transmitted signal and the received signal, so that the chip can transmit and receive signals at the same time. Compared with the circulator, it is easier to miniaturize, thereby allowing the chip to be built-in, with lower production costs, and better separation of the transmitted signal and the received signal.

[0078] For example, Figure 6 As shown, the attenuation phase shifting module includes an attenuator and a phase shifter, the attenuator and the phase shifter are connected in series, the attenuator is used to modulate the amplitude of the transmission signal, and the phase shifter is used to modulate the phase of the transmission signal. Exemplarily, the attenuator can be a digital attenuator or an analog attenuator. For example, the attenuator can include multiple resistors, including at least one variable resistor, so that the attenuation of the attenuator can be adjusted by adjusting the value of the variable resistor. Figure 6 In the example, an attenuator including three resistors (including two variable resistors) is taken.

[0079] Exemplarily, the phase shifter may be a digital phase shifter or an analog phase shifter. For example, the phase shifter may include a variable capacitor, so that the phase shift amount of the phase shifter can be adjusted by changing the capacitance or voltage value of the variable capacitor.

[0080] Understandable, Figure 6 The attenuator and phase shifter shown are only examples. The attenuator and phase shifter in the embodiment of the present application may also include other electronic components. Figure 6 The resistor and capacitor structures shown are to be understood as defining attenuators and phase shifters.

[0081] In a possible implementation, the attenuated phase shift module is connected in series with the directional coupling module. Figure 4As shown, the directional coupling module includes a fifth port and a sixth port. The input port of the attenuation phase shifting module is connected to the third port, the output port of the attenuation phase shifting module is connected to the fifth port, and the fourth port is connected to the sixth port. The first port receives the transmission signal output by the transmitting port of the chip. After the attenuation phase shifting module receives the transmission signal through the third port, it modulates the transmission signal and / or shifts the phase to generate a second signal, and outputs the second signal to the directional coupling module. After the directional coupling module receives the second signal through the fifth port, it generates a first signal according to the second signal, and outputs the first signal to the fourth port through the sixth port. The fourth port outputs the first signal, and the first signal is transmitted from the fourth port to the second port and the receiving port of the chip.

[0082] Exemplarily, the power of the second signal is determined by the power of the transmitted signal and the attenuation of the attenuation phase shift module. For example, the power of the second signal, the power of the transmitted signal and the attenuation of the attenuation phase shift module satisfy the following formula:

[0083] P2=P0-A

[0084] Wherein, P0 is the power of the transmitted signal, P2 is the power of the second signal, and A is the attenuation of the attenuation phase shift module. The units of P0 and P2 are dBm, and the unit of A is dB. For example, if the power P0 of the transmitted signal is 5.5dBm, and the attenuation A of the attenuation phase shift module is 4dB, then the power P2 of the second signal is 1.5dBm.

[0085] In a possible implementation, the interference elimination circuit further includes a seventh port, and the directional coupling module further includes an eighth port. The seventh port is connected to the antenna, and the eighth port is connected to the seventh port. The directional coupling module is also used to generate a fifth signal according to the second signal, and output the fifth signal to the seventh port through the eighth port; the seventh port is used to output the fifth signal, and the fifth signal is transmitted to the antenna so that the antenna transmits the fifth signal.

[0086] Exemplarily, in the directional coupling module, the fifth port is connected via a wire (such as Figure 5 The first wire in the circuit) is connected to a resistor (e.g., a 50 ohm resistor) and a reference ground, and the sixth port and the eighth port are arranged on the second wire. The fifth port is the incident port of the second signal (e.g., Figure 5 Port 1 in the figure), the sixth port is an isolation port for the second signal (such as Figure 5 Port 3 in the figure), the eighth port is a coupling port for the second signal (such as Figure 5 When the second signal is transmitted on the first wire, the first signal and the fifth signal are generated by coupling on the second wire, and the first signal is output through the sixth port and the fifth signal is output through the eighth port.

[0087] Exemplarily, the power of the fifth signal is determined by the power of the second signal and the coupling coefficient of the directional coupling module. The power of the fifth signal, the power of the second signal and the coupling coefficient of the directional coupling module satisfy the following formula:

[0088] P5=P2-C1

[0089] Wherein, C1 is the coupling coefficient of the directional coupling module, P2 is the power of the second signal, and P5 is the power of the fifth signal. For example, if P2 is 1.5 dBm and C1 is 10 dBc, then P5 is -8.5 dBm.

[0090] Exemplarily, the power of the first signal is determined by the power of the second signal and the isolation coefficient of the directional coupling module. For example, the power of the first signal, the power of the second signal and the isolation coefficient of the directional coupling module satisfy the following formula:

[0091] P1=P2-I

[0092] Where I is the isolation coefficient, P1 is the power of the first signal, and P2 is the power of the second signal. For example, if P1 is 1.5 dBm and I is 20 dBc, then P1 is -18.5 dBm.

[0093] The power of the second signal is determined by the power of the transmitted signal and the attenuation of the attenuation phase shift module, so the power of the first signal is determined by the power of the transmitted signal, the attenuation of the attenuation phase shift module and the isolation coefficient of the directional coupling module. For example, the power of the first signal and the power of the transmitted signal satisfy the following formula:

[0094] P1=P0-AI

[0095] Wherein, P1 is the power of the first signal, P0 is the power of the transmitted signal, A is the attenuation of the attenuation phase shifting module, and I is the isolation coefficient of the directional coupling module.

[0096] Exemplarily, the isolation coefficient of the directional coupling module is determined by the self-coupling coefficient of the chip. The interference signal includes the transmit-receive coupled interference signal of the chip, and the power of the transmit-receive coupled interference signal is determined by the self-coupling coefficient of the chip (or can be called the package coupling coefficient of the chip). For example, the power of the transmit-receive coupled interference signal, the power of the transmit signal, and the self-coupling coefficient of the chip satisfy the following formula:

[0097] Ppac=P0-Cpac

[0098] Among them, Ppac is the power of the transmitted and received coupled interference signal, P0 is the power of the transmitted signal, and Cpac is the self-coupling coefficient of the chip. For example, if P0 is 5.5dBm and Cpac is 29dBc, then Ppac is -23.5dBm.

[0099] Exemplarily, the isolation coefficient of the directional coupling module is greater than or equal to the self-coupling coefficient of the chip. For example, the difference between the isolation coefficient of the directional coupling module and the self-coupling coefficient of the chip is less than or equal to the second threshold. That is, the isolation coefficient of the directional coupling module can be slightly greater than the self-coupling coefficient of the chip.

[0100] From the above, it can be seen that when the isolation coefficient of the directional coupling module is close to the self-coupling coefficient of the chip, and the isolation coefficient of the directional coupling module is slightly larger than the self-coupling coefficient of the chip, the attenuation phase shift module can modulate the transmit signal with a smaller attenuation, so that the first signal can offset the chip's transmit-receive coupling interference signal, and can reduce the loss of the transmit signal in the attenuation phase shift module. In addition, when the isolation coefficient of the directional coupling module is slightly larger than the self-coupling coefficient of the chip, the power of the generated first signal is less than the power of the interference signal, thereby avoiding additional interference caused by excessive power of the first signal.

[0101] In a possible implementation, the seventh port is also used to receive a received signal from the antenna and output the received signal to the eighth port, where the received signal is the signal received by the antenna; the directional coupling module is also used to receive the received signal through the eighth port and output the received signal to the fourth port through the sixth port; the fourth port is also used to output the received signal.

[0102] Exemplarily, the received signal is an echo signal of a target received by the antenna. For example, the received signal may be an echo signal of the fifth signal reflected by the target after the antenna transmits the fifth signal. That is, after the antenna receives the received signal, the received signal may be transmitted to the seventh port, and the seventh port transmits the received signal to the eighth port. After the directional coupling module receives the received signal through the eighth port, the received signal is transmitted to the fourth port through the sixth port, and the fourth port transmits the received signal to the second port, and the second port outputs the received signal to the receiving port of the chip. Since the eighth port and the sixth port are arranged on the same wire, the eighth port is equivalent to the incident port of the received signal, and the sixth port is equivalent to the through port of the received signal, so the received signal can be directly transmitted from the eighth port to the sixth port, so that the transmitting signal and the receiving signal can be isolated through the directional coupling module, and the transmitting and receiving signals can be turned on at the same time.

[0103] In a possible implementation, the interference elimination circuit may further include a matching module. Figure 7As shown, the matching module is arranged between the eighth port and the seventh port of the directional coupling module, that is, the eighth port is connected to the seventh port through the matching module, and the matching module includes a ninth port and a tenth port, the ninth port is connected to the eighth port, and the tenth port is connected to the seventh port. The matching module is used to receive the fifth signal through the ninth port, output the reflected signal through the ninth port, and output the fifth signal to the seventh port through the tenth port. The directional coupling module is also used to output the reflected signal to the fourth port through the sixth port; the fourth port is also used to output the reflected signal, and the reflected signal is used to offset the interference signal.

[0104] Exemplarily, the matching module can also be used for impedance matching to achieve matching between the antenna and the transmission line to ensure signal gain. After the fifth signal output from the eighth port of the directional coupling module is transmitted to the ninth port, it is transmitted at the ninth port to generate a reflected signal. The reflected signal is transmitted from the ninth port to the eighth port, output from the sixth port after passing through the directional coupling module, and transmitted to the receiving port of the chip through the fourth port and the second port.

[0105] Exemplarily, the frequency of the reflected signal is the same as the frequency of the fifth signal, and the amplitude and phase of the reflected signal and the fifth signal may be the same or different. The power of the reflected signal is determined by the reflection coefficient of the ninth port. For example, the power of the reflected signal and the reflection coefficient of the ninth port satisfy the following formula:

[0106] Pre=P5+S11

[0107] Wherein, Pre is the power of the reflected signal, S11 is the reflection coefficient of the ninth port, and P5 is the power of the fifth signal. For example, if the power of the fifth signal is -8.5 dBm, S11 is -10 dB, then the power Pre of the reflected signal is -18.5 dBm.

[0108] Exemplarily, the matching module may include at least one variable capacitor or at least one variable resistor, and the at least one variable capacitor or at least one variable resistor is used to adjust the phase of the reflected signal. Figure 7 As shown, the matching module may include three variable capacitors, which form a π-type matching network. The phase of the reflected signal can be changed by changing the capacitance value of any variable capacitor among the three variable capacitors.

[0109] In the embodiment of the present application, the matching module can also be replaced by the description of "dynamic matching network", "matching network" and the like, and the present application does not limit the name of the matching module.

[0110] In the embodiment of the present application, the interference signal can be offset by the reflected signal and the first signal, so that the interference can be better eliminated. The phase of the reflected signal is adjusted by changing the value of at least one variable capacitor or at least one variable resistor in the matching module, so that the reflected signal can better offset the interference signal, thereby avoiding the interference caused by the reflected signal.

[0111] See also Fig. 8A , Fig. 8A This is a schematic diagram of another interference elimination circuit provided in an embodiment of the present application. Fig. 8A As shown, the interference elimination circuit includes a first port, a second port, a transmitting feed module, a first switch and a second switch. The transmitting feed module includes an attenuation phase shift module and a directional coupling module, the attenuation phase shift module includes a fifth port and a sixth port, the first switch includes a first fixed end, a first movable end and a second movable end, and the second switch includes a second fixed end, a third movable end and a fourth movable end.

[0112] The first port is connected to the transmitting port of the chip, the second port is connected to the receiving port of the chip, the transmitting feed module includes a third port and a fourth port, the input port of the attenuation phase shift module is connected to the third port, the output port of the attenuation phase shift module is connected to the fifth port, and the fourth port is connected to the sixth port. The first fixed end is connected to the third port, the first moving end is connected to the first port, and the second moving end is connected to the reference ground. The second fixed end is connected to the fourth port, the third moving end is connected to the second port, and the fourth moving end is connected to the first port.

[0113] Exemplarily, the second moving end may be connected to the reference ground via a resistor (eg, a 50-ohm resistor).

[0114] like Fig. 8A As shown, when the first fixed end is connected to the first moving end and the second fixed end is connected to the third moving end, the path between the attenuation phase shift module and the first port is turned on by the first switch, and the path between the directional coupling module and the second port is turned on by the second switch. In this case, the chip can be in the sensing mode or radar mode, and can receive and transmit signals at the same time to realize the sensing function of the chip. It can be understood that in this case, the signal flow of the circuit can refer to Figure 4 The relevant descriptions in the circuit shown will not be described in detail here.

[0115] like Figure 8BAs shown, when the first fixed end is connected to the second movable end, and the second fixed end is connected to the third movable end, the directional coupling module is used to transmit the received signal to the second port, and the second port is used to output the received signal. Among them, the received signal is the signal received from the antenna by the seventh port. In this case, the path between the directional coupling module and the receiving port of the chip is turned on by the second switch, and the chip is in the communication receiving mode. After the antenna receives the received signal, the received signal can be transmitted to the receiving port of the chip through the seventh port, the eighth port, the sixth port, the fourth port, the second switch, and the second port.

[0116] like Figure 8C As shown, when the first fixed end is connected to the second movable end, and the second fixed end is connected to the fourth movable end, the directional coupling module is used to transmit the transmission signal to the seventh port. In this case, the path between the directional coupling module and the transmission port of the chip is turned on by the second switch, the chip processes the communication transmission mode, and after the transmission port of the chip outputs the transmission signal, the transmission signal is transmitted to the seventh port through the second switch, the fourth port, the sixth port, and the eighth port, and the seventh port transmits the transmission signal to the antenna, so that the antenna transmits the transmission signal.

[0117] In an embodiment of the present application, when the chip is in a communication transmission module or a receiving mode, the path between the chip's transmitting port and the attenuation phase shifting module is disconnected by a first switch, so that the chip is not affected by the attenuation phase shifting module in the communication transmission mode or the communication receiving mode, thereby ensuring the stability of the chip's communication performance.

[0118] In one possible implementation, Fig. 8A , Figure 8B , Figure 8C The interference elimination circuit shown also includes a matching module for impedance matching to achieve matching between the antenna and the transmission line to ensure signal gain. It is understood that the specific description of the matching module can be referred to Figure 6 The relevant instructions in the circuit shown are not described in detail here.

[0119] See also Fig. 9 , Fig. 9 A schematic diagram of the structure of another interference elimination circuit provided in an embodiment of the present application. Fig. 9As shown, the interference elimination circuit includes a first port, a second port, and a transmitting feed module. The transmitting feed module includes an attenuation phase shifting module, a directional coupling module, a third port, and a fourth port, and the directional coupling module includes a fifth port and a sixth port. The first port is connected to the transmitting port of the chip, the second port is connected to the receiving port of the chip, the third port is connected to the first port, the fourth port is connected to the second port, the input port of the attenuation phase shifting module is connected to the third port, the output port of the attenuation phase shifting module is connected to the fourth port, the fifth port is connected to the third port, and the sixth port is connected to the fourth port.

[0120] The first port is used to receive a transmission signal from a transmission port of the chip. The attenuation phase shift module is used to modulate and / or phase shift the transmission signal to generate a third signal, and transmit the third signal to the fourth port. The directional coupling module is used to generate a fourth signal based on the transmission signal, and transmit the fourth signal to the fourth port. The fourth port is used to output a first signal, the first signal being composed of the third signal and the fourth signal, that is, the first signal is a superposition signal of the third signal and the fourth signal.

[0121] It is understood that the description of the directional coupling module and the attenuation phase shift module can be referred to above. Figure 5 and Figure 6 The relevant descriptions in are not described in detail here.

[0122] Exemplarily, the isolation coefficient of the directional coupling module may be determined by the self-coupling coefficient of the chip.

[0123] Exemplarily, the power of the third signal is determined by the power of the transmitted signal and the attenuation of the attenuation phase shift module. For example, the power of the third signal, the power of the transmitted signal and the attenuation of the attenuation phase shift module satisfy the following formula:

[0124] P3=P0-A

[0125] Wherein, P0 is the power of the transmitted signal, P3 is the power of the third signal, and A is the attenuation of the attenuation phase shift module.

[0126] Exemplarily, the power of the fourth signal is determined by the power of the transmitted signal and the isolation coefficient of the directional coupling module. For example, the power of the fourth signal, the power of the transmitted signal and the isolation coefficient of the directional coupling module satisfy the following formula:

[0127] P4=P0-I

[0128] Wherein, I is the isolation coefficient of the directional coupling module, P4 is the power of the fourth signal, and P0 is the power of the transmitted signal.

[0129] In one possible implementation, Fig. 9The interference elimination circuit shown also includes a seventh port, and the directional coupling module also includes an eighth port; the seventh port is connected to the antenna, and the eighth port is connected to the seventh port. The directional coupling module is also used to generate a fifth signal according to the transmission signal, and output the fifth signal to the seventh port through the eighth port. The seventh port is used to output the fifth signal, and the fifth signal is transmitted to the antenna so that the antenna transmits the fifth signal.

[0130] Exemplarily, in the directional coupling module, the eighth port and the sixth port are arranged in the same wire (eg Figure 5 The fifth port is set in another wire (such as Figure 5 The directional coupling module receives a transmission signal through the fifth port. When the transmission signal is transmitted on the first wire, the first wire is coupled with the second wire, thereby generating a fourth signal and a fifth signal on the second wire. The fourth signal is output through the sixth port, and the fifth signal is output through the eighth port.

[0131] Exemplarily, the power of the fifth signal is determined by the power of the transmitted signal and the coupling coefficient of the directional coupling module. The power of the fifth signal, the power of the transmitted signal and the coupling coefficient of the directional coupling module satisfy the following formula:

[0132] P5=P0-C1

[0133] Wherein, C1 is the coupling coefficient of the directional coupling module, P0 is the power of the transmitted signal, and P5 is the power of the fifth signal. For example, if P0 is 5.5 dBm and C1 is 10 dBc, then P5 is -4.5 dBm.

[0134] It is understandable that the transmission signal may have loss in the attenuation phase shift module, so the power of the transmission signal received by the fifth port may be different from the power of the transmission signal output by the transmission port of the chip. For example, if the transmission signal has a loss of 1dB in the attenuation phase shift module, and the power of the transmission signal output by the transmission port is 5.5dBm, then the power of the transmission signal received by the fifth port is 4.5dBm.

[0135] In a possible implementation, the seventh port is also used to receive a received signal from the antenna and output the received signal to the eighth port, where the received signal is the signal received by the antenna; the directional coupling module is also used to receive the received signal through the eighth port and output the received signal to the fourth port through the sixth port; the fourth port is also used to output the received signal.

[0136] In a possible implementation, the interference elimination circuit may further include a matching module. Fig.10As shown, the matching module is arranged between the eighth port and the seventh port of the directional coupling module, that is, the eighth port is connected to the seventh port through the matching module, and the matching module includes a ninth port and a tenth port, the ninth port is connected to the eighth port, and the tenth port is connected to the seventh port. The matching module is used to receive the fifth signal through the ninth port, output the reflected signal through the ninth port, and output the fifth signal to the seventh port through the tenth port. The directional coupling module is also used to output the reflected signal to the fourth port through the sixth port; the fourth port is also used to output the reflected signal, and the reflected signal is used to offset the interference signal.

[0137] It is understandable that the specific description of the matching module can be referred to Figure 7 The relevant description of the circuit shown is not described in detail here.

[0138] In an embodiment of the present application, the interference elimination circuit may include a plurality of attenuation phase shifting modules, which are connected in parallel and are used to perform amplitude modulation and / or phase modulation on a transmission signal to generate a signal for canceling the interference signal. Fig. 9 The attenuation phase shift module in the circuit shown may also be connected in parallel to one or more attenuation phase shift modules.

[0139] In the embodiment of the present application, the attenuation phase shift module is connected in parallel with the directional coupling module, and the third signal and the fourth signal are generated according to the transmission signal, respectively. The amplitude and phase of the third signal and the fourth signal may be the same or different. Since the interference signal may be composed of signals with different amplitudes and different phases. Therefore, the attenuation phase shift module and the directional coupling module can generate signals with different amplitudes and different phases, so that the first signal can be better offset with the interference signal, and the signal generated by the isolation port when the directional coupler transmits the transmission signal can be reasonably used to offset the interference signal, thereby making the interference elimination operation easier.

[0140] See also Fig.11A , Fig.11A This is a schematic diagram of another interference elimination circuit provided in an embodiment of the present application. Fig.11A As shown, the interference elimination circuit includes a first port, a second port, a transmitting feed module, a first switch and a second switch. The transmitting feed module includes an attenuation phase shift module and a directional coupling module, the attenuation phase shift module includes a fifth port and a sixth port, the first switch includes a first fixed end, a first movable end and a second movable end, and the second switch includes a second fixed end, a third movable end and a fourth movable end.

[0141] The first port is connected to the transmitting port of the chip, the second port is connected to the receiving port of the chip, the transmitting feed module includes a third port and a fourth port, the input port of the attenuation phase shift module is connected to the third port, the output port of the attenuation phase shift module is connected to the fourth port, the fifth port is connected to the third port, and the sixth port is connected to the fourth port. The first fixed end is connected to the third port, the first moving end is connected to the first port, and the second moving end is connected to the reference ground. The second fixed end is connected to the fourth port, the third moving end is connected to the second port, and the fourth moving end is connected to the first port.

[0142] Exemplarily, the second moving end may be connected to the reference ground via a resistor (eg, a 50-ohm resistor).

[0143] like Fig.11A As shown, when the first fixed end is connected to the first moving end and the second fixed end is connected to the third moving end, the path between the attenuation phase shift module and the first port is turned on by the first switch, and the path between the directional coupling module and the second port is turned on by the second switch. In this case, the chip can be in the sensing mode or radar mode, and can receive and transmit signals at the same time to realize the sensing function of the chip. It can be understood that in this case, the signal flow of the circuit can refer to Fig. 9 The relevant descriptions in the circuit shown will not be described in detail here.

[0144] like Fig. 11B As shown, when the first fixed end is connected to the second movable end, and the second fixed end is connected to the third movable end, the directional coupling module is used to transmit the received signal to the second port, and the second port is used to output the received signal. Among them, the received signal is the signal received from the antenna by the seventh port. In this case, the path between the directional coupling module and the receiving port of the chip is turned on by the second switch, and the chip is in the communication receiving mode. After the antenna receives the received signal, the received signal can be transmitted to the receiving port of the chip through the seventh port, the eighth port, the sixth port, the fourth port, the second switch, and the second port.

[0145] like Fig. 11C As shown, when the first fixed end is connected to the second movable end, and the second fixed end is connected to the fourth movable end, the directional coupling module is used to transmit the transmission signal to the seventh port. In this case, the path between the directional coupling module and the transmission port of the chip is turned on by the second switch, the chip processes the communication transmission mode, and after the transmission port of the chip outputs the transmission signal, the transmission signal is transmitted to the seventh port through the second switch, the fourth port, the sixth port, and the eighth port, and the seventh port transmits the transmission signal to the antenna, so that the antenna transmits the transmission signal.

[0146] In an embodiment of the present application, when the chip is in a communication transmission module or a receiving mode, the path between the chip's transmitting port and the attenuation phase shifting module is disconnected by a first switch, so that the chip is not affected by the attenuation phase shifting module in the communication transmission mode or the communication receiving mode, thereby ensuring the stability of the chip's communication performance.

[0147] In one possible implementation, the Fig.11A , Fig. 11B , Fig. 11C The interference elimination circuit shown also includes a matching module for impedance matching to achieve matching between the antenna and the transmission line to ensure signal gain. It is understood that the specific description of the matching module can be referred to Figure 7 The relevant instructions in the circuit shown are not described in detail here.

[0148] In the embodiment of the present application, the chip may be a WiFi chip or an ultra wide band (UWB) chip, or other chips with wireless communication functions. Figure 4 , Figure 7 , Fig. 8A , Figure 8B , Figure 8C , Fig. 9 , Fig.10 Fig.11A , Fig. 11B as well as Fig. 11C The circuit shown can be applied to a WiFi telepathic system or a UWB system or other wireless communication systems (for example, a Bluetooth (BT) system or a Bluetooth Low Energy (BLE) system).

[0149] In the embodiment of the present application, the chip can be replaced by an unpackaged integrated circuit (ie, a bare crystal or a bare chip) having a wireless communication function. Figure 4 , Figure 7-11C The interference elimination circuit shown can be packaged in the same chip as the integrated circuit. Alternatively, Figure 3 , Figure 6-11C The interference cancellation circuit shown can be packaged in one chip.

[0150] See also Fig.12 , Fig.12 The following is a flow chart of a parameter calibration method provided in an embodiment of the present application. The method can be applied to a controller, which is connected to an interference elimination circuit, and the interference elimination circuit is used to eliminate the interference signal of the chip. The description of the interference elimination circuit can be referred to Figure 4 , Figure 7-11C The relevant description in , will not be elaborated here. Fig.12 As shown, the method includes but is not limited to the following steps.

[0151] 1201. Obtain a first gradient value of a first parameter, where the first gradient value is used to indicate the degree of influence of the first parameter on the power of an interference signal, and the first parameter is a parameter in an interference elimination circuit.

[0152] Exemplarily, the interference signal may also be referred to as a direct path interference signal, and the interference signal is a signal other than the receiving signal in the chip receiving port.

[0153] Exemplarily, the first parameter is an adjustable parameter in the interference elimination circuit. For example, the interference elimination circuit includes an attenuation phase shift module and a matching module. The first parameter may include any one of the attenuation amount of the attenuation phase shift module, the phase shift amount of the attenuation phase shift module, and the phase shift amount of the matching module.

[0154] Exemplarily, the attenuation of the attenuated phase shifting module and the phase shift of the attenuated phase shifting module are determined by the parameters of the electronic components in the attenuated phase shifting module, and the phase shift of the matching module is determined by the electronic components in the matching module. Therefore, the first parameter may include the parameters of the attenuated phase shifting module and the electronic components in the matching module. For example, the attenuated phase shifting module includes an attenuator and a phase shifter, the attenuator includes at least one variable resistor, the phase shifter includes a variable capacitor, the matching module includes at least one variable capacitor or at least one variable resistor, and the first parameter may include the resistance value of the variable resistor in the attenuator, the capacitance value of the variable capacitor in the phase shifter, the capacitance value of the variable capacitor in the matching module, or the resistance value of the variable resistor in the matching module.

[0155] Exemplarily, the controller may be packaged in the chip, or the controller may not be packaged in the chip. It is understandable that when the controller is packaged in the chip, the chip adjusts the parameters of the interference elimination circuit according to the first gradient value to reduce the interference it receives.

[0156] In one possible implementation, the controller obtaining the first gradient value of the first parameter may include the following steps: when the first parameter is a first value, the control chip outputs a first transmit signal, and obtains a first power value of an interference signal corresponding to the first transmit signal; when the first parameter is a second value, the control chip outputs a second transmit signal, and obtains a second power value of the interference signal corresponding to the second transmit signal; and determines the first gradient value based on the first value, the second value, the first power value, and the second power value.

[0157] As an example, when the controller obtains the power value of the interference signal corresponding to the transmitted signal, the interference signal and the received signal can be separated from the signal received by the receiving port of the chip to obtain the power value of the interference signal. For example, the received signal and the interference signal can be obtained by fast time compression, that is, the waveform of the transmitted signal is used as a sample and the received waveform is matched filtered to obtain the received signal.

[0158] As another example, the interference elimination circuit is arranged between the chip and the reference ground, that is, the seventh port of the interference elimination circuit shown above is connected to the reference ground. In this example, the signal received by the receiving port of the chip is the interference signal, and the controller can directly obtain the interference signal from the receiving port without separating the received signal.

[0159] Exemplarily, after the controller obtains the first value, the second value, the first power value, and the second power value, it can determine the first difference and the second difference, where the first difference is the difference between the first value and the second value, and the second difference is the difference between the first power value and the second power value. The first gradient value can be represented by the ratio of the first difference and the second difference. For example, when the attenuation of the attenuation phase shift module is 5dB, the power value of the interference signal is 10dBm, and when the attenuation of the attenuation phase shift module is 4dB, the power value of the interference signal is 5dBm. The gradient value corresponding to the attenuation of the attenuation phase shift module can be expressed as 0.2.

[0160] It can be understood that the controller can control the chip to output the transmission signal multiple times, so as to obtain multiple first parameter values ​​and multiple power values, and then use the average value of the multiple first parameter values ​​and the average value of the multiple power values ​​to obtain the first gradient value, or use the multiple first parameter values ​​and multiple power values ​​to calculate multiple gradient values, and the first gradient value is the average value of the multiple gradient values.

[0161] Exemplarily, when the first parameter includes multiple parameters, the first gradient value includes the gradient values ​​corresponding to the multiple parameters respectively. The controller can obtain the gradient values ​​corresponding to the multiple parameters respectively, for example, the controller adjusts the value of one parameter each time, the values ​​of other parameters remain unchanged, and controls the chip to output a transmission signal to obtain the gradient value corresponding to the parameter.

[0162] In the embodiment of the present application, by obtaining the value of the adjusted first parameter, the power values ​​of the interference signal when the first parameter takes different values ​​are obtained respectively, so that the influence of the first parameter on the power of the interference signal can be accurately obtained.

[0163] 1202. Adjust the value of the first parameter according to the first gradient value until the power of the interference signal meets the first condition.

[0164] Exemplarily, the controller gradually adjusts the first parameter according to the first gradient value so that the power of the interference signal gradually decreases until the power of the interference signal satisfies the first condition. After the controller adjusts the value of the first parameter according to the first gradient value each time, the control chip outputs a transmission signal to obtain the power of the interference signal corresponding to the current value of the first parameter.

[0165] As an example, the first condition may include that the power of the interference signal is less than a first threshold. The first threshold may be determined based on the business requirements or capabilities of the chip. For example, the higher the interference requirements of the chip's business, the smaller the value of the first threshold. For another example, the chip can separate the interference signal from the received signal when the power of the interference signal is less than the first threshold. In this example, by adjusting the value of the first parameter, the power of the interference signal of the chip is less than the first threshold, so that the interference of the chip can meet the requirements, for example, the chip can separate the interference signal from the received signal.

[0166] As another example, the first condition includes that the power of the interference signal has no downward trend, or the power of the interference signal has an upward trend. That is, each time the controller obtains the power of the interference signal, the power of the interference signal obtained this time is compared with the power of the interference signal obtained last time. If the power of the interference signal remains unchanged or the power of the interference signal does not change for several consecutive times, the controller no longer adjusts the power of the first parameter. Alternatively, in the case where the power of the interference signal obtained this time is greater than the power of the interference signal obtained last time, the controller no longer adjusts the power of the first parameter, and records the value of the first parameter corresponding to the power of the interference signal obtained last time. That is, after comparing the power of the interference signal obtained many times, when the power of the interference signal has no downward trend, or the power of the interference signal has an upward trend, stop adjusting the first parameter, so that the power of the interference signal is relatively small.

[0167] Exemplarily, when the first parameter includes multiple parameters, the values ​​of the parameters are adjusted according to the corresponding gradient values. For example, the gradient value corresponding to the attenuation of the attenuation phase shift module is 0.2, and the gradient value corresponding to the phase shift of the attenuation phase shift module is 0.3. Then, each time the parameters are adjusted, the attenuation of the attenuation phase shift module is adjusted by 0.2 dB, and the phase shift of the attenuation phase shift module is adjusted by 0.3 degrees.

[0168] Exemplarily, after the power of the interference signal meets the first condition, the controller saves the value of the first parameter so that the value of the first parameter can be used in the subsequent process of the chip receiving the transmission signal to make the interference signal of the chip meet the first condition without repeating the calibration and adjustment of the parameters.

[0169] In an embodiment of the present application, the controller gradually adjusts the parameters in the interference elimination circuit according to the first gradient value to gradually reduce the power of the interference signal until the power of the interference signal can meet the first condition, so that the interference elimination circuit can better eliminate the interference signal of the chip.

[0170] In an embodiment of the present application, the controller may be a chip or a processor, including a logic circuit and an interface, wherein the interface is used to receive relevant information (for example, a first gradient value, the power of an interference signal) and output control instructions, wherein the control instructions are used to adjust the value of a first parameter and control the chip to output a transmission signal; the logic circuit may be used to execute related logic control processes, such as determining whether the power of the interference signal satisfies a first condition, confirming the value of the first parameter, etc.

[0171] The embodiment of the present application also provides a chip, which may include a packaging substrate and a bare chip (die), and the bare chip is provided with Figure 4 , Figure 7-11C In any circuit shown in the figure, the packaging substrate can be used to package the bare chip.

[0172] The embodiment of the present application also provides a wireless transceiver system, which may include a chip, an antenna, and an interference elimination circuit. The interference elimination circuit may be as follows: Figure 4 , Figure 7-11C Any circuit shown in the figure.

[0173] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An interference elimination circuit, characterized in that: Applied to the synaesthesia system, comprising a first port, a second port, and a transmitting and feeding module; The first port is connected to the transmitting port of the chip, the second port is connected to the receiving port of the chip, the transmitting feed module includes a third port and a fourth port, the third port is connected to the first port, and the fourth port is connected to the second port; The first port is used to receive a transmission signal from a transmission port of the chip; a transmitting feeding module, configured to perform amplitude modulation and / or phase shifting on the transmitting signal to generate a first signal, and input the first signal to the second port through the fourth port; The second port is used to output the first signal; wherein the first signal is transmitted to the receiving port of the chip to offset the interference signal of the receiving port of the chip.

2. The circuit according to claim 1, characterized in that The transmitting feeding module includes an attenuation phase shifting module and a directional coupling module, and the directional coupling module includes a fifth port and a sixth port; The input port of the attenuated phase shift module is connected to the third port, the output port of the attenuated phase shift module is connected to the fifth port, and the fourth port is connected to the sixth port; The attenuation phase shift module is used to perform amplitude modulation and / or phase shift on the transmission signal to generate a second signal, and output the second signal to the directional coupling module; The directional coupling module is used to generate the first signal according to the second signal, and output the first signal to the fourth port through the sixth port.

3. The circuit according to claim 1, characterized in that The transmitting feeding module includes an attenuation phase shifting module and a directional coupling module, and the directional coupling module includes a fifth port and a sixth port; The input port of the attenuated phase shift module is connected to the third port, the output port of the attenuated phase shift module is connected to the fourth port, the fifth port is connected to the third port, and the sixth port is connected to the fourth port; The attenuation phase shifting module is used to perform amplitude modulation and / or phase shifting on the transmission signal to generate a third signal, and transmit the third signal to the fourth port; The directional coupling module is used to generate a fourth signal based on the transmission signal, and transmit the fourth signal to the fourth port; The fourth port is used to output the first signal, where the first signal is composed of the third signal and the fourth signal.

4. The circuit according to claim 2 or 3, characterized in that The circuit further includes a seventh port, and the directional coupling module further includes an eighth port; the seventh port is connected to the antenna, and the eighth port is connected to the seventh port; The directional coupling module is further used to generate a fifth signal according to the second signal or the transmission signal, and output the fifth signal to the seventh port through the eighth port; The seventh port is used to output the fifth signal, and the fifth signal is transmitted to the antenna.

5. The circuit according to claim 4, characterized in that The circuit further includes a matching module, the eighth port is connected to the seventh port through the matching module, the matching module includes a ninth port and a tenth port, the ninth port is connected to the eighth port, and the tenth port is connected to the seventh port; The matching module is configured to receive the fifth signal through the ninth port, output a reflected signal through the ninth port, and output the fifth signal to the seventh port through the tenth port; The directional coupling module is further used to output the reflected signal to the fourth port through the sixth port; The fourth port is further used to output the reflected signal, and the reflected signal is used to offset the interference signal.

6. The circuit according to claim 5, characterized in that The matching module includes at least one variable capacitor or at least one variable resistor, and the at least one variable capacitor or at least one variable resistor is used to adjust the phase of the reflected signal.

7. The circuit according to claim 5 or 6, characterized in that The power of the reflected signal is determined by the reflection coefficient of the ninth port of the matching module.

8. The circuit according to any one of claims 4 to 7, characterized in that: The seventh port is further used to receive a reception signal from the antenna and output the reception signal to the eighth port, wherein the reception signal is a signal received by the antenna; The directional coupling module is further configured to receive the received signal through the eighth port, and output the received signal to the fourth port through the sixth port; The fourth port is also used to output the received signal.

9. The circuit according to any one of claims 4 to 8, characterized in that: The circuit further includes a first switch and a second switch, the first switch includes a first fixed end, a first movable end and a second movable end, and the second switch includes a second fixed end, a third movable end and a fourth movable end; The first fixed end is connected to the third port, the first movable end is connected to the first port, and the second movable end is connected to the reference ground; the second fixed end is connected to the fourth port, the third movable end is connected to the second port, and the fourth movable end is connected to the first port; The directional coupling module is also used to transmit a receiving signal to the second port when the first fixed end is connected to the second moving end and the second fixed end is connected to the third moving end, and the second port is used to output the receiving signal; wherein the receiving signal is a signal received by the seventh port from the antenna; or, The directional coupling module is further configured to transmit the transmission signal to the seventh port when the first fixed end is connected to the second movable end, and the second fixed end is connected to the fourth movable end.

10. The circuit according to any one of claims 4 to 9, characterized in that: The power of the fifth signal is determined by the power of the second signal or the transmit signal and the coupling coefficient of the directional coupling module.

11. The circuit according to any one of claims 2 to 10, characterized in that: The isolation coefficient of the directional coupling module is determined by the self-coupling coefficient of the chip.

12. The circuit according to any one of claims 2 to 11, characterized in that: The attenuation and phase shifting module comprises an attenuator and a phase shifter. The attenuator and the phase shifter are connected in series. The attenuator is used to perform amplitude modulation on the transmission signal, and the phase shifter is used to perform phase modulation on the transmission signal.

13. The circuit according to any one of claims 2 to 12, characterized in that: The power of the first signal is determined by the power of the transmit signal and the isolation coefficient of the directional coupling module.

14. The circuit according to any one of claims 1 to 13, characterized in that: The interference signal includes at least one of the following: a transmission-reception coupling interference signal of the chip, and a direct path interference signal received by the antenna after the antenna transmits the signal.

15. A parameter calibration method, characterized in that: Applied to a controller, the controller is connected to an interference elimination circuit, the interference elimination circuit is used to eliminate interference signals of a chip, and the method includes: Acquire a first gradient value of a first parameter, where the first gradient value is used to indicate the degree of influence of the first parameter on the power of the interference signal, and the first parameter is a parameter in the interference elimination circuit; The value of the first parameter is adjusted according to the first gradient value until the power of the interference signal meets a first condition.

16. The method according to claim 15, characterized in that The first condition includes that the power of the interference signal is less than a first threshold.

17. The method according to claim 15 or 16, characterized in that The obtaining of a first gradient value of a first parameter comprises: When the first parameter is a first value, controlling the chip to output a first transmit signal, and obtaining a first power value of an interference signal corresponding to the first transmit signal; When the first parameter is a second value, controlling the chip to output a second transmit signal, and obtaining a second power value of an interference signal corresponding to the second transmit signal; The first gradient value is determined based on the first value, the second value, the first power value, and the second power value.

18. The method according to any one of claims 15 to 17, characterized in that: The interference elimination circuit includes at least one of an attenuation phase shift module, a directional coupling module, and a matching module, and the first parameter includes at least one of the following: the attenuation amount of the attenuation phase shift module, the phase shift amount of the attenuation phase shift module, and the phase shift amount of the matching module.

19. The method according to any one of claims 15 to 18, characterized in that: The method further comprises: The value of the first parameter is saved.

20. A chip, characterized in that: The chip includes a packaging substrate and a bare chip, the bare chip is provided with the interference elimination circuit according to any one of claims 1 to 14, and the packaging substrate is used to package the bare chip.

21. A wireless transceiver system, characterized in that: The wireless transceiver comprises a chip, an antenna and an interference elimination circuit as described in any one of claims 1-14.

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