CN113473512A - Interference positioning method - Google Patents
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- CN113473512A CN113473512A CN202110873822.0A CN202110873822A CN113473512A CN 113473512 A CN113473512 A CN 113473512A CN 202110873822 A CN202110873822 A CN 202110873822A CN 113473512 A CN113473512 A CN 113473512A
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- 238000002955 isolation Methods 0.000 claims abstract description 159
- 238000004088 simulation Methods 0.000 claims abstract description 65
- 230000004807 localization Effects 0.000 claims description 11
- 238000003475 lamination Methods 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 description 5
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- 238000001514 detection method Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
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- 239000003990 capacitor Substances 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/04—Arrangements for maintaining operational condition
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The application discloses an interference positioning method, which is used for carrying out interference positioning on a radio frequency circuit and comprises the following steps: establishing a simulation circuit corresponding to the radio frequency circuit in simulation software, and grounding a transmitting end, a receiving end and an antenna end of a duplexer in the simulation circuit; detecting the isolation D1 between the TX end and the RX end, the isolation D2 between the TX end and the ANT end and the isolation D3 between the RX end and the ANT end in simulation software; and determining the interfered circuit section in the radio frequency circuit according to the isolation degree D1, the isolation degree D2 and the isolation degree D3. The method and the device can be used for interference positioning of the radio frequency circuit.
Description
Technical Field
The application relates to the field of radio frequency simulation, in particular to an interference positioning method.
Background
FDD (Frequency Division duplex) is a Frequency Division system in which transmission and reception can be performed simultaneously, and transmission and reception are performed at different frequencies, and thus, in an actual circuit design, it can be realized by a duplexer. The duplexer is generally disposed in the radio frequency circuit, and the radio frequency circuit is generally connected to the duplexer through an impedance matching circuit.
As shown in fig. 1, the duplexer includes a transmitting end, a receiving end, and an antenna end, where the transmitting end is a transmitting path through the impedance matching circuit to the antenna end, and the antenna end is a receiving path through the impedance matching circuit to the receiving end. Since FDD operates simultaneously with transmission and reception, it is required that a duplexer does not affect reception performance when transmitting at high power. However, in practical terms, a de-sense problem often occurs on the rf circuit board, which affects the receiving performance of the duplexer, because the receiving end and the transmitting end of the duplexer on the rf circuit board are not isolated enough, or the transmitting end is interfered by the transmitting power in the receiving end or the antenna end. Once the board has the problem of reduced sensitivity, the radio frequency circuit board needs to be subjected to interference analysis and positioning.
Disclosure of Invention
The embodiment of the application provides an interference positioning method for performing interference positioning on a radio frequency circuit.
The embodiment of the application provides an interference positioning method, which is used for performing interference positioning on a radio frequency circuit, wherein the radio frequency circuit comprises a duplexer and a first impedance matching circuit, a second impedance matching circuit and a third impedance matching circuit which are respectively connected with a transmitting end, a receiving end and an antenna end of the duplexer; the first impedance matching circuit, the second impedance matching circuit and the third impedance matching circuit are respectively provided with a TX end, an RX end and an ANT end which deviate from the duplexer; the interference positioning method comprises the following steps:
s1, establishing a simulation circuit corresponding to the radio frequency circuit in the simulation software, and grounding a transmitting end, a receiving end and an antenna end of a duplexer in the simulation circuit;
s2, detecting the isolation D1 between the TX end and the RX end, the isolation D2 between the TX end and the ANT end and the isolation D3 between the RX end and the ANT end in simulation software;
and S3, determining the interfered circuit section in the radio frequency circuit according to the isolation degree D1, the isolation degree D2 and the isolation degree D3.
Optionally, the step of S3 includes:
obtaining the difference between the maximum one of the isolation D1, the isolation D2 and the isolation D3 and the other two isolations;
and comparing the difference with a first preset value, and if the difference is greater than or equal to the first preset value, determining that the circuit segment corresponding to the circuit segment with the largest value in the isolation D1, the isolation D2 and the isolation D3 has interference.
Optionally, the step of S3 includes:
and respectively comparing the isolation degree D1, the isolation degree D2 and the isolation degree D3 with a second preset value, and determining that the circuit section corresponding to the isolation degree greater than or equal to the second preset value has interference.
Optionally, after determining the disturbed circuit segment, the method further comprises:
detecting the isolation degree of a circuit section between each circuit node of the interfered circuit section and a target port through the grounding point of the duplexer in simulation software, wherein the target port is a port deviating from the duplexer in the interfered circuit section;
and determining the specific interfered circuit interval according to the isolation of the circuit interval between each circuit node and the target port through the grounding point of the duplexer.
Optionally, the isolation between the circuit nodes of the interfered circuit segment and the circuit section between the target ports via the grounding point of the duplexer is detected according to a preset sequence, where the preset sequence is a connection sequence between the circuit nodes in the interfered circuit segment.
Optionally, an electronic component is disposed in the interfered circuit section, and after the interfered circuit section in the radio frequency circuit is determined, the method further includes:
adjusting the attribute parameters of the electronic components in simulation software;
detecting the isolation degree of the interfered circuit interval after adjusting the attribute parameters in simulation software;
and determining whether the electronic component has interference according to the isolation degree of the interfered circuit interval after the attribute parameters are adjusted.
Optionally, S2 includes:
acquiring scattering parameters of a radio frequency circuit;
importing the scattering parameters into simulation software, and carrying out simulation test on the simulation circuit through the simulation software;
isolation D1, isolation D2, and isolation D3 were obtained from the simulation test results.
Optionally, acquiring scattering parameters of the radio frequency circuit includes:
acquiring the lamination information of a circuit board of a radio frequency circuit;
and importing the lamination information into simulation software, and performing electromagnetic simulation in the simulation software to extract the scattering parameters of the radio frequency circuit.
According to the embodiment of the application, the simulation circuit is established in the simulation software, the transmitting end, the receiving end and the antenna end of the duplexer in the simulation circuit are all grounded, then the isolation degree D1, the isolation degree D2 and the isolation degree D3 are detected in the simulation software, and finally, the isolation degree D1, the isolation degree D2 and the isolation degree D3 are analyzed, so that which circuit section in the radio frequency circuit is interfered can be determined.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic circuit diagram of a radio frequency circuit;
fig. 2 is a flowchart illustrating an interference positioning method according to an embodiment of the present application;
fig. 3 is a schematic diagram of the duplexer after the transmit, receive and antenna terminals are grounded;
FIG. 4 is a schematic diagram of a two-port model;
fig. 5 is a schematic flow chart of an interference localization method according to another embodiment of the present application;
fig. 6 is a schematic flow chart of an interference localization method according to another embodiment of the present application;
fig. 7 is a schematic flow chart of an interference localization method according to another embodiment of the present application;
FIG. 8 is a diagram illustrating simulation results in an embodiment of the present application;
fig. 9 is a schematic flow chart of an interference localization method according to another embodiment of the present application;
fig. 10 is a schematic flow chart of an interference localization method according to another embodiment of the present application;
FIG. 11 is a schematic illustration of simulation results in another embodiment of the present application;
fig. 12 is a flowchart illustrating an interference positioning method according to another embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is noted that the terms "first", "second", "third", and the like are used merely for distinguishing between descriptions and are not intended to indicate or imply relative importance.
The embodiment of the application provides an interference positioning method, which can be used for positioning a trace with interference on an outgoing frequency circuit, and particularly can be used for positioning a trace with interference in a radio frequency circuit of a frequency division system. As shown in fig. 1, the rf circuit may include a duplexer 10, and a first impedance matching circuit 20, a second impedance matching circuit 30, and a third impedance matching circuit 40 respectively connected to a transmitting end, a receiving end, and an antenna end of the duplexer; the first impedance matching circuit 20, the second impedance matching circuit 30, and the third impedance matching circuit 40 have a TX terminal, an RX terminal, and an ANT terminal, respectively, which are away from the duplexer. As shown in fig. 2, the method includes steps S1 to S3:
and S1, establishing a simulation circuit corresponding to the radio frequency circuit in the simulation software, and grounding the transmitting end, the receiving end and the antenna end of the duplexer in the simulation circuit.
The emulation software may be ADS (advanced design system), multisim, etc.
The simulation circuit refers to a schematic circuit corresponding to the radio frequency circuit. Specifically, a (Printed Circuit Board) file of the radio frequency Circuit may be imported into the simulation software to extract a schematic Circuit of the radio frequency Circuit. Of course, the simulation circuit may also be drawn in simulation software with reference to a schematic diagram of the radio frequency circuit.
After the simulation circuit is established, grounding terminals are added to the transmitting terminal, the receiving terminal and the antenna terminal of the duplexer in the simulation circuit in the simulation software, and the simulation circuit after the grounding terminal is added can refer to fig. 3. The transmitting end, the receiving end and the antenna end of the duplexer are grounded, signals do not need to be transmitted through a grounding point inside the duplexer, and the duplexer is equivalent to the fact that the duplexer does not exist.
S2, detecting the isolation D1 between the TX end and the RX end, the isolation D2 between the TX end and the ANT end and the isolation D3 between the RX end and the ANT end in simulation software.
Specifically, simulation tests are performed on the simulation circuit in simulation software, so that the isolation D1 between the TX terminal and the RX terminal, the isolation D2 between the TX terminal and the ANT terminal, and the isolation D3 between the RX terminal and the ANT terminal are detected. The simulation test is to simulate the signal from the TX end to the RX end in the simulation software,
because only the connection relationship between the electronic components of the circuit is described in the schematic circuit, that is, only the connection relationship between the electronic components is described in the simulation circuit, and the related parameters of the electronic components, such as the electronic component model and the package type, etc., are electronically detected, after the simulation circuit of the radio frequency circuit is obtained, the related parameters of the radio frequency circuit are imported into simulation software, where the related parameters include, but are not limited to, the electronic component model, the package type, the material of the lead in the radio frequency circuit, the width and the length of the lead, etc., and then a simulation model is established according to the simulation circuit and is subjected to simulation test, so as to detect the isolation D1 between the TX end and the RX end, the isolation D2 between the TX end and the ANT end, and the isolation D3 between the RX end and the ANT end.
It can be understood that there is a coupling relationship between each circuit segment, and when one circuit segment works, it will affect other circuit segments, and the coupling relationship here is expressed by isolation, that is, the isolation can be used to describe the magnitude of the effect generated between the circuit segments, and the smaller the isolation is, the less the attenuation of the power leakage to another circuit segment is, the smaller the influence of the power leakage to another trace is, the lower the frequency point of the radio frequency circuit is. Before simulation test, frequency setting is needed, and the frequency can be the working frequency of the radio frequency circuit.
Illustratively, before the simulation test, a first two-port model may be established according to a circuit segment between the TX end and the RX end, where the first two-port model includes a first impedance signal source, and a first end of the first impedance signal source is connected to the TX end, a second end of the first impedance signal source is grounded, and the RX end is grounded. In the simulation test, the process of sending and receiving analog signals, namely, the first impedance signal source sends signals to the TX terminal, and the grounding point of the duplexer is sent to the RX terminal through the impedance matching circuit connected with the first impedance signal source.
Before the simulation test, a second dual-port model can be established according to a circuit section between the TX end and the ANT end, the second dual-port model comprises a second impedance signal source, the first end of the second impedance signal source is connected with the TX end, the second end of the second impedance signal source is grounded, and the ANT end is grounded. During simulation test, the process of sending and receiving analog signals, namely, the second impedance signal source sends signals to the TX terminal, and the grounding point of the duplexer is sent to the ANT terminal through the impedance matching circuit connected with the second impedance signal source.
Before the simulation test, a third two-port model can be established according to a circuit section between the RX end and the ANT end, the third two-port model includes a third impedance signal source, a first end of the third impedance signal source is connected with the ANT end, a second end of the third impedance signal source is grounded, and the RX end is grounded. In the simulation test, the process of sending and receiving analog signals, namely, the third impedance signal source sends signals to the ANT terminal, and the grounding point of the duplexer is sent to the RX terminal through the impedance matching circuit connected with the third impedance signal source.
The two-port model can be referred to fig. 4, wherein the impedance signal source R can be a device with a preset impedance value, such as a resistor, and the preset impedance value can be determined according to the characteristics of the rf circuit, and the preset impedance value is typically 50 ohms. The impedance signal source can output signals, so that the analog radio frequency channel has the output of the signals, and the analog radio frequency channel works.
And S3, determining the interfered circuit section in the radio frequency circuit according to the isolation degree D1, the isolation degree D2 and the isolation degree D3.
And analyzing the isolation degree D1, the isolation degree D2 and the isolation degree D3 so as to determine the interfered circuit section in the radio frequency circuit.
According to the embodiment of the application, the simulation circuit is established in the simulation software, the transmitting end, the receiving end and the antenna end of the duplexer in the simulation circuit are all grounded, then the isolation degree D1, the isolation degree D2 and the isolation degree D3 are detected in the simulation software, and finally, the isolation degree D1, the isolation degree D2 and the isolation degree D3 are analyzed, so that which circuit section in the radio frequency circuit is interfered can be determined.
Fig. 5 is a flowchart illustrating an interference positioning method according to another embodiment of the present application. Referring to fig. 5, step S2 includes steps S21 to S23:
s21: and acquiring scattering parameters of the radio frequency circuit.
The scattering parameters, i.e. the S-parameters, are used to estimate the information of the amplitude and phase of the reflected and transmitted signals. It should be noted that the S parameter is not a single parameter, and for the dual-port model, it includes S11, S22, S21, and S12, and for the dual-port model (including port 1 and port 2), that is, for each trace (the first end and the second end of the impedance matching circuit), when port 2 indicated by S11 is matched, the reflection coefficient of port 1 is obtained; when the port 1 pointed by S22 is matched, the reflection coefficient of the port 2 is obtained; s12 indicates that when port 1 is matched, the reverse transmission coefficient from port 2 to port 1; s21 indicates the reverse transmission coefficient, i.e., isolation, from port 1 to port 2 when port 2 is matched.
S22: and importing the scattering parameters into simulation software, and carrying out simulation test on the simulation circuit through the simulation software.
And importing the scattering parameters into simulation software, establishing a simulation model according to the scattering parameters and the simulation circuit, and further performing simulation test on the simulation model.
S23: isolation D1, isolation D2, and isolation D3 were obtained from the simulation test results.
After the simulation test is performed, the scattering parameters of the simulation model are read and extracted from S21, i.e., isolation D1, isolation D2, and isolation D3.
On the basis of fig. 2, in the present embodiment, the isolation detection method is simple and the obtained isolation is accurate by obtaining the scattering parameters of the radio frequency circuit, importing the scattering parameters into the simulation software, and performing the simulation test on the simulation circuit through the simulation software, and obtaining the isolations D1, D2, and D3 from the simulation test result.
In the embodiment of fig. 5, the scattering parameters of the rf circuit can be obtained by analyzing the rf circuit with a network analyzer, however, the network analyzer has high requirements for the use environment, and the magnitude of the magnetic field in the environment may affect the magnitude of each coefficient in the scattering parameters. To this end, referring to fig. 6, the step S21 includes steps S211 and S212, and includes:
s211: acquiring the lamination information of the circuit board of the radio frequency circuit.
The lamination information indicates the number of layers of the radio frequency circuit, the wiring positions of electronic components in the radio frequency circuit, and the like, for example, which layer of the circuit board of the radio frequency circuit the circuit segments are respectively disposed on, and the length, width, and where the via holes are disposed in each circuit segment.
S212: and importing the lamination information into simulation software, and performing electromagnetic simulation in the simulation software to extract the scattering parameters of the radio frequency circuit.
The operation of the radio frequency circuit is simulated through electromagnetic simulation, so that the scattering parameters of the radio frequency circuit are obtained.
On the basis of the embodiment of fig. 5, in the embodiment of the present application, the lamination information of the circuit board of the radio frequency circuit is acquired, the lamination information is imported into the simulation software, and electromagnetic simulation is performed in the simulation software to extract the scattering parameters of the radio frequency circuit, the operating environment of the simulation software is an ideal environment, and the scattering parameters of the radio frequency circuit are extracted through simulation, so that the influence of the use environment on the coefficients in the scattering parameters can be avoided, and the scattering parameters that are more appropriate to the radio frequency circuit can be obtained.
Fig. 7 is a flowchart illustrating an interference positioning method according to another embodiment of the present application. Referring to fig. 7, step S3 includes steps S31 to S32.
S31: the difference between the maximum one of the isolation degrees D1, D2 and D3 and the other two isolation degrees is obtained.
Exemplarily, referring to fig. 8, in the simulation, the set frequency freq is set to 2.110GHz, and the isolation obtained by the simulation is: d1-91.934 dB, D2-60.579 dB, and D3-94.629 dB, so that the value of the isolation D2 is the largest; taking the difference between the isolation degree D2 and the isolation degree D1, D21 is 31.355(D21 represents the difference between the isolation degree D2 and the isolation degree D1); taking the difference between the isolation degree D2 and the isolation degree D3, D23 was found to be 34.05(D23 indicates the difference between the isolation degree D2 and the isolation degree D3).
S32: and comparing the difference with a first preset value, and if the difference is greater than or equal to the first preset value, determining that the circuit segment corresponding to the circuit segment with the largest value in the isolation D1, the isolation D2 and the isolation D3 has interference.
Illustratively, the first preset value Di is 30, and it is known that D21 is 31.355, which is greater than Di; d23 is greater than Di when d.05 is greater than Di, so that interference exists in the circuit segment corresponding to the isolation D2 (i.e., the circuit segment from the TX end to the ANT end via the grounding point of the duplexer). It should be understood that, in this step, as long as the difference between the maximum value and the other two isolation degrees is greater than or equal to the first preset value, it can be indicated that the circuit segment corresponding to the maximum value has interference.
According to the circuit segment with the interference, the difference value between the maximum one of the isolation degrees D1, D2 and D3 and the other two isolation degrees is obtained, the difference value is compared with the first preset value, the circuit segment with the interference can be determined, and the method is simple and rapid.
Fig. 9 is a flowchart illustrating an interference positioning method according to another embodiment of the present application. The step S3 includes S33:
s33: and respectively comparing the isolation degree D1, the isolation degree D2 and the isolation degree D3 with a second preset value, and determining that the circuit section corresponding to the isolation degree greater than or equal to the second preset value has interference.
If the isolation degree greater than or equal to the second preset value exists in the isolation degree D1, the isolation degree D2 and the isolation degree D3, determining that interference exists in the circuit section corresponding to the second preset value or greater; if the isolation degree smaller than the second preset value exists in the isolation degree D1, the isolation degree D2 and the isolation degree D3, the circuit segment corresponding to the smaller second preset value does not have interference.
Exemplarily, referring to fig. 8, taking the second preset value as-85 dB as an example, the isolation obtained by simulation is: d1-91.934 dB, D2-60.579 dB, D3-94.629 dB, and the isolation D2 is greater than the second predetermined value, so that the circuit segment with interference is the circuit segment corresponding to the isolation D2 (i.e., the circuit segment from the TX end to the ANT end via the grounding point of the duplexer).
And comparing the isolation degree D1, the isolation degree D2 and the isolation degree D3 with a second preset value respectively, and determining that the circuit section corresponding to the isolation degree greater than or equal to the second preset value has interference, wherein the method is simple and efficient.
Fig. 10 is a flowchart illustrating an interference positioning method according to another embodiment of the present application. After determining the disturbed circuit segment, referring to fig. 10, the method further includes steps S41 to S42:
s41: and detecting the isolation degree of each circuit node of the interfered circuit section to a circuit section between a target port through the grounding point of the duplexer in simulation software, wherein the target port is a port deviating from the duplexer in the interfered circuit section.
The circuit node is a connection point between electronic components in the circuit. Taking fig. 10 as an example, in a circuit interval from the grounding point of the duplexer to the RX end, the circuit nodes include point P1 and point P2.
S42: and determining the specific interfered circuit interval according to the isolation degree of the circuit interval between each circuit node and the target port through the grounding point of the duplexer.
Exemplarily, referring to fig. 8 and 11, taking an interfered circuit segment as a circuit segment from a TX end to an ANT end via a grounding point of a duplexer as an example, a simulation test is performed on a circuit section between a P1 point and a target port via the grounding point of the duplexer in a simulation software to detect an isolation degree of the circuit section, and obtain an isolation degree of-87.538 dB; namely, after the detected circuit interval is changed, the isolation is reduced to-87.538 dB from the original-60.579 dB, and the isolation is still larger than the second preset value Di. Since the signal is emitted from the point P1 to the ANT terminal via the grounding point of the duplexer in the simulation test, the power leakage is small in the signal flow direction, and it can be proved that, when the isolation of the circuit segment from the TX terminal to the ANT terminal via the grounding point of the duplexer is detected in the foregoing step, the large power leakage occurs when the signal reaches the point P1 from the TX terminal, and thus the isolation is large. In detecting the isolation of the circuit section from the point P1 to the target port, the power leakage is less, and therefore the isolation is also reduced, and it is inferred that the power leakage occurs in the circuit section from the TX end to the point P1, and therefore it is possible to determine that the interference exists in the circuit section from the TX end to the point P1.
On the contrary, if the isolation variation obtained by performing simulation test on the circuit interval between the grounding point of the duplexer and the target port at the point P1 is small, it can be proved that the power leakage does not occur in the circuit interval between the point P1 and the target port, and thus it can be determined that the interference does not occur in the circuit interval between the TX end and the point P1.
After determining that the interference is not in the circuit section between the TX end and the point P1, the detection circuit node P2 detects the circuit section between the target port and the ground point of the duplexer, that is, the isolation is detected by replacing the circuit node, so that the circuit section with the interference can be specifically determined.
On the basis of the embodiment of fig. 2, in this embodiment, the isolation between each circuit junction of the interfered circuit segment and the target port is detected, and the circuit interval where the interference exists can be specifically determined through the isolation, so that the process is simpler and more accurate.
Another embodiment of the present application further provides another interference positioning method, where after the interfered circuit segment is determined, the method detects, according to a preset sequence, an isolation between circuit nodes of the interfered circuit segment and a circuit interval between a target port and a grounding point of a duplexer, where the preset sequence is a connection sequence between the circuit nodes in the interfered circuit segment.
Taking fig. 3 as an example, the connection sequence of the circuit nodes is P1 → P2, but it is needless to say that the sequence may be P2 → P1. After the circuit section of the interfered circuit section is determined, according to the connection sequence of the circuit nodes, the isolation degree of a circuit section between the grounding point of the P1 through the duplexer and the target port is detected, and then the isolation degree of a circuit section between the grounding point of the P1 through the duplexer and the target port is detected.
In this embodiment, the isolation between the circuit sections from the circuit nodes of the interfered circuit segment to the target port via the grounding point of the duplexer is detected according to the preset sequence, so that the specific interfered circuit section can be determined more quickly.
The embodiment of fig. 9 only determines the circuit section with interference, however, if the circuit section with interference is provided with an electronic component, it is not known whether the circuit section is interfered due to the influence of the conductive wire in the radio frequency circuit or the circuit section is interfered due to the unreasonable setting of the attribute parameters of the electronic component. Therefore, another embodiment of the present application provides an interference positioning method to position a specific interfered position in a circuit section. After determining the specific disturbed circuit section, referring to fig. 12, the method further includes steps S51 to S53:
s51: and adjusting the attribute parameters of the electronic components in the simulation software.
The attribute parameter of the electronic component is a parameter corresponding to the type of the electronic component, and for example, the attribute parameter of the inductor is an inductance value, the attribute parameter of the capacitor is a capacitance value, and the attribute parameter of the resistor is a resistance value.
Taking the circuit interval from the interfered circuit interval P2 to the RX end as an example, the inductance value of the inductor is adjusted in simulation software; the adjustment direction (i.e., increase or decrease) may be determined by multiple detections; the specific adjustment amount can be determined by multiple detections.
S52: and detecting the isolation degree of the interfered circuit interval after the attribute parameters are adjusted in simulation software.
S53: and determining whether the electronic component has interference according to the isolation of the interfered circuit section after the attribute parameters are adjusted.
And comparing the isolation before and after the attribute parameter adjustment to determine whether the isolation is reduced, and if the isolation is reduced, determining that the inductor in the circuit interval from the P2 to the RX terminal is interfered.
On the basis of the embodiment of fig. 9, the embodiment of the present application detects the isolation degree of the interfered circuit section after adjusting the attribute parameters by adjusting the attribute parameters of the electronic components in the simulation software, and can determine the specific interfered position in the interfered circuit section according to the isolation degree of the interfered circuit section after adjusting the attribute parameters.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (8)
1. An interference positioning method is used for carrying out interference positioning on a radio frequency circuit, wherein the radio frequency circuit comprises a duplexer and a first impedance matching circuit, a second impedance matching circuit and a third impedance matching circuit which are respectively connected with a transmitting end, a receiving end and an antenna end of the duplexer; the first impedance matching circuit, the second impedance matching circuit and the third impedance matching circuit are respectively provided with a TX end, an RX end and an ANT end which deviate from the duplexer; the interference positioning method is characterized by comprising the following steps:
s1, establishing a simulation circuit corresponding to the radio frequency circuit in simulation software, and grounding a transmitting end, a receiving end and an antenna end of a duplexer in the simulation circuit;
s2, detecting an isolation degree D1 between the TX terminal and the RX terminal, an isolation degree D2 between the TX terminal and the ANT terminal and an isolation degree D3 between the RX terminal and the ANT terminal in the simulation software;
s3, determining the interfered circuit section in the radio frequency circuit according to the isolation degree D1, the isolation degree D2 and the isolation degree D3.
2. The interference localization method according to claim 1, wherein the step S3 comprises:
obtaining the difference between the maximum one of the isolation D1, the isolation D2 and the isolation D3 and the other two isolations;
and comparing the difference with a first preset value, and if the difference is greater than or equal to the first preset value, determining that the circuit segment corresponding to the circuit segment with the largest value in the isolation D1, the isolation D2 and the isolation D3 has interference.
3. The interference localization method according to claim 1, wherein the step S3 comprises:
and respectively comparing the isolation degree D1, the isolation degree D2 and the isolation degree D3 with a second preset value, and determining that the circuit section corresponding to the isolation degree greater than or equal to the second preset value has interference.
4. The interference localization method according to claim 2 or 3, characterized in that after determining the interfered circuit segment, the method further comprises:
detecting the isolation degree of each circuit node of the interfered circuit section between a circuit section and a target port through the grounding point of the duplexer in the simulation software, wherein the target port is a port deviating from the duplexer in the interfered circuit section;
and determining the specific interfered circuit interval according to the isolation of the circuit interval between each circuit node and the target port through the grounding point of the duplexer.
5. The interference localization method according to claim 4, wherein the isolation between the circuit nodes of the interfered circuit segment and the circuit section between the target port via the grounding point of the duplexer is detected according to a predetermined sequence, and the predetermined sequence is a connection sequence between the circuit nodes of the interfered circuit segment.
6. The interference localization method according to claim 4, wherein an electronic component is disposed in the interfered circuit section, and after determining the interfered circuit section in the radio frequency circuit, the method further comprises:
adjusting the attribute parameters of the electronic components in the simulation software;
detecting the isolation degree of the interfered circuit interval after adjusting the attribute parameters in the simulation software;
and determining whether the electronic component has interference according to the isolation degree of the interfered circuit interval after the attribute parameters are adjusted.
7. The interference localization method according to claim 1, wherein the S2 comprises:
acquiring scattering parameters of the radio frequency circuit;
importing the scattering parameters into the simulation software, and carrying out simulation test on the simulation circuit through the simulation software;
and obtaining the isolation degree D1, the isolation degree D2 and the isolation degree D3 from simulation test results.
8. The method of claim 7, wherein the obtaining scattering parameters of the radio frequency circuit comprises:
acquiring the lamination information of the circuit board of the radio frequency circuit;
and importing the lamination information into the simulation software, and performing electromagnetic simulation in the simulation software to extract the scattering parameters of the radio frequency circuit.
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