CN113473512B - Interference positioning method - Google Patents
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- CN113473512B CN113473512B CN202110873822.0A CN202110873822A CN113473512B CN 113473512 B CN113473512 B CN 113473512B CN 202110873822 A CN202110873822 A CN 202110873822A CN 113473512 B CN113473512 B CN 113473512B
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000002955 isolation Methods 0.000 claims abstract description 154
- 238000004088 simulation Methods 0.000 claims abstract description 66
- 238000012360 testing method Methods 0.000 claims description 24
- 238000003475 lamination Methods 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 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
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Abstract
The application discloses an interference positioning method for performing interference positioning on a radio frequency circuit, which comprises the following steps: establishing a simulation circuit corresponding to the radio frequency circuit in simulation software, and enabling a transmitting end, a receiving end and an antenna end of a duplexer in the simulation circuit to be grounded; 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 carrying out interference positioning on 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 Duplexing, frequency division duplex) is a frequency division system, whose transmission and reception can be performed simultaneously, and whose transmission and reception are operated at different frequencies, and thus, in an actual circuit design, can be realized by a duplexer. The diplexer is typically disposed in a radio frequency circuit, and the radio frequency circuit is typically connected to the diplexer through an impedance matching circuit.
As shown in fig. 1, the duplexer includes a transmitting end, a receiving end and an antenna end, wherein the transmitting end is a transmitting path from the antenna end through the impedance matching circuit, and the antenna end is a receiving path from the receiving end through the impedance matching circuit. Since FDD is a simultaneous operation of transmission and reception, it is required that a duplexer cannot affect reception performance at the time of high-power transmission. However, in practical terms, a problem of sensitivity degradation (de-sense, decrease sensitivity) often occurs on the rf circuit board, thereby affecting the reception performance of the duplexer thereof, because the routing of the receiving end and the routing of the transmitting end of the duplexer on the rf circuit board, or the routing isolation between the receiving end and the antenna end is insufficient, so that the transmitting end is interfered by the transmitting power in the receiving end or the antenna end. Once the sensitivity of the board is reduced, 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 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 comprises the following steps:
s1, establishing a simulation circuit corresponding to a radio frequency circuit in simulation software, and enabling a transmitting end, a receiving end and an antenna end of a duplexer in the simulation circuit to be grounded;
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;
s3, determining an 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 S3 includes:
obtaining the difference value between the maximum value of the isolation D1, the isolation D2 and the isolation D3 and the other two isolation;
comparing the difference value with a first preset value, and if the difference value is larger than or equal to the first preset value, determining that the circuit segment corresponding to the biggest value among the isolation degree D1, the isolation degree D2 and the isolation degree D3 has interference.
Optionally, the step S3 includes:
and comparing the isolation D1, the isolation D2 and the isolation D3 with second preset values respectively, and determining that the circuit section corresponding to the isolation greater than or equal to the second preset values has interference.
Optionally, after determining the interfered circuit segment, the method further comprises:
detecting the isolation degree of a circuit interval 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 a specific interfered circuit interval according to the isolation degree of the circuit interval between the grounding point of each circuit node through the duplexer and the target port.
Optionally, the isolation of the circuit section between the ground point of the circuit section to the target port of the diplexer is detected according to a preset sequence, wherein the preset sequence is the connection sequence between the circuit nodes in the circuit section to be interfered.
Optionally, electronic components are disposed in the interfered circuit section, and after determining the interfered circuit section in the radio frequency circuit, the method further includes:
the attribute parameters of the electronic components are adjusted in simulation software;
detecting the isolation of the interfered circuit interval after the attribute parameters are adjusted in simulation software;
and determining whether the electronic component is interfered 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;
the scattering parameters are imported into simulation software, and simulation tests are carried out on the simulation circuit through the simulation software;
and obtaining the isolation degree D1, the isolation degree D2 and the isolation degree D3 from the simulation test result.
Optionally, acquiring the scattering parameter of the radio frequency circuit includes:
acquiring 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 scattering parameters of the radio frequency circuit.
According to the embodiment of the application, the simulation circuit is built in the simulation software, the transmitting end, the receiving end and the antenna end of the duplexer in the simulation circuit are 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 degrees D1, D2 and D3 are analyzed to determine which circuit section in the radio frequency circuit is interfered.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments of the present application will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic circuit diagram of a radio frequency circuit;
FIG. 2 is a flow chart of a method for interference localization according to an embodiment of the present application;
fig. 3 is a schematic diagram of the duplexer after the transmitting end, receiving end, and antenna end are grounded;
FIG. 4 is a schematic diagram of a dual port model;
FIG. 5 is a flow chart of a method of interference location in another embodiment of the present application;
FIG. 6 is a flow chart of a method of interference location in another embodiment of the present application;
FIG. 7 is a flow chart of a method of interference location in another embodiment of the present application;
FIG. 8 is a schematic diagram of simulation results in an embodiment of the present application;
FIG. 9 is a flow chart of a method of interference location in another embodiment of the present application;
FIG. 10 is a flow chart of a method of interference location in 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 flow chart of a method for interference location in another embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be noted that the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
The embodiment of the application provides an interference positioning method which can be used for positioning wires with interference on an emergent frequency circuit, in particular to wires with interference in a radio frequency circuit of a frequency division system. As shown in fig. 1, the radio frequency 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 connected to a transmitting end, a receiving end, and an antenna end of the duplexer, respectively; the first, second and third impedance matching circuits 20, 30, 40 have TX, RX and ANT ends, respectively, facing away from the diplexer. As shown in fig. 2, the method includes steps S1 to S3:
s1, establishing a simulation circuit corresponding to the radio frequency circuit in simulation software, and enabling a transmitting end, a receiving end and an antenna end of a duplexer in the simulation circuit to be grounded.
The simulation software may be ADS (advanced design system), multisim, etc.
The simulation circuit refers to a schematic circuit corresponding to the radio frequency circuit. Specifically, the (Printed Circuit Board ) file of the radio frequency circuit can be imported into simulation software to extract the schematic diagram circuit of the radio frequency circuit. Of course, the simulation circuit may also be drawn in the simulation software with reference to the schematic diagram of the radio frequency circuit.
After the simulation circuit is built, a grounding terminal is added to the transmitting terminal, the receiving terminal and the antenna terminal of the middle duplexer of the simulation circuit in simulation software, and the simulation circuit with the grounding terminal added can refer to fig. 3. The transmitting end, the receiving end and the antenna end of the duplexer are grounded, and signals are not required to be transmitted through the grounding point through the inside of the duplexer, which 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 degree D1 between the TX end and the RX end, the isolation degree D2 between the TX end and the ANT end and the isolation degree D3 between the RX end and the ANT end are detected. Simulation testing is to simulate the signal from the TX end to the RX end in simulation software,
because the schematic circuit only describes the connection relation between the electronic components of the circuit, namely the simulation circuit only describes the connection relation between the electronic components, and the related parameters of the electronic components, such as the type of the electronic components, the packaging type and the like, are not included, after the simulation circuit of the radio frequency circuit is obtained, the related parameters of the radio frequency circuit are led into simulation software, including but not limited to the type of the electronic components, the packaging type, the materials of wires in the radio frequency circuit, the width, the length and the like of the wires, then a simulation model is built according to the simulation circuit, and simulation test is carried out on the simulation model, so that the isolation D1 between a TX end and an RX end, the isolation D2 between the TX end and an ANT end and the isolation D3 between the RX end and the ANT end are detected.
It will be appreciated that there is typically a coupling relationship between the circuit segments, where one circuit segment will affect the other circuit segments when in operation, and where the coupling relationship is represented by an isolation, i.e., the magnitude of the isolation may be used to describe the magnitude of the effect that occurs between the circuit segments, and the smaller the isolation, the less attenuation that the radio frequency circuit leaks to the other circuit segment at that frequency point, and the less its effect on the other trace. Before the simulation test is performed, a frequency setting is also required, and the frequency can be the working frequency of the radio frequency circuit.
For example, before the simulation test, a first dual-port model may be established according to a circuit segment between the TX end and the RX end, where the first dual-port model includes a first impedance signal source, and the first end of the first impedance signal source is connected to the TX end, the second end of the first impedance signal source is grounded, and the RX end is grounded. During simulation test, the process of sending and receiving an analog signal, namely, the first impedance signal source sends a signal to the TX end, and the grounding point of the duplexer is sent to the RX end 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 segment 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 the analog signal, namely the second impedance signal source sends a signal to the TX end, and the grounding point of the duplexer is sent to the ANT end through the impedance matching circuit connected with the second impedance signal source.
Before the simulation test, a third dual-port model can be established according to a circuit segment between the RX end and the ANT end, the third dual-port model comprises a third impedance signal source, the first end of the third impedance signal source is connected with the ANT end, the second end of the third impedance signal source is grounded, and the RX end is grounded. During simulation test, the process of sending and receiving the analog signal, namely the third impedance signal source sends a signal to the ANT end, and the grounding point of the duplexer is sent to the RX end through the impedance matching circuit connected with the third impedance signal source.
The dual-port model described above may refer to fig. 4, in which the impedance signal source R may be a device with a preset impedance value, such as a resistor, and the preset impedance value may be determined according to the characteristics of the radio frequency circuit, and typically, the preset impedance value is typically 50 ohms. The signal output can be performed through the impedance signal source, so that the analog radio frequency channel has the output of the signal, and the analog radio frequency channel works.
S3, determining an 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 built in the simulation software, the transmitting end, the receiving end and the antenna end of the duplexer in the simulation circuit are 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 degrees D1, D2 and D3 are analyzed to determine which circuit section in the radio frequency circuit is interfered.
Fig. 5 is a flow chart of 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 parameter, i.e. the S parameter, is used to evaluate the information of the amplitude and phase of the reflected signal and of the transmitted signal. It should be noted that, the S parameter is not a parameter, and for a dual-port model, it includes S11, S22, S21, S12, and for a 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), the reflection coefficient of port 1 refers to the port 2 when the S11 is matched; s22, when the ports 1 are matched, the reflection coefficient of the port 2 is the reflection coefficient; s12 refers to the reverse transmission coefficient from port 2 to port 1 when port 1 is matched; s21 refers to the reverse transmission coefficient, i.e. isolation, of port 1 to port 2 when port 2 is matched.
S22: and importing the scattering parameters into simulation software, and performing 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 a simulation circuit, and performing simulation test on the simulation model.
S23: and obtaining the isolation degree D1, the isolation degree D2 and the isolation degree D3 from the simulation test result.
After the simulation test is performed, the scattering parameters of the simulation model are read, and S21, that is, the isolation D1, the isolation D2, and the isolation D3 are extracted therefrom.
Based on fig. 2, in this embodiment, by acquiring the scattering parameter of the radio frequency circuit, the scattering parameter is imported into the simulation software, and the simulation software performs a simulation test on the simulation circuit, and isolation degrees D1, D2 and D3 are acquired from the simulation test result, the method for detecting the isolation degrees is simpler, and the obtained isolation degrees are also more accurate.
In the embodiment of fig. 5, the radio frequency circuit may be analyzed by using a network analyzer to obtain the scattering parameter of the radio frequency circuit, however, the network analyzer has a high requirement on the use environment, and the magnitude of the magnetic field in the environment may affect the magnitude of each coefficient in the scattering parameter. For this reason, referring to fig. 6, step S21 includes steps S211 and S212, including:
s211: and acquiring lamination information of a circuit board of the radio frequency circuit.
The lamination information refers to the number of layers of the radio frequency circuit, the wiring position 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 section is disposed on, and the length, width, where the via hole is disposed, and the like of each circuit section at the time of specific production.
S212: and importing the lamination information into simulation software, and performing electromagnetic simulation in the simulation software to extract scattering parameters of the radio frequency circuit.
And simulating the operation of the radio frequency circuit through electromagnetic simulation, so as to obtain the scattering parameter of the radio frequency circuit.
Based on the embodiment of fig. 5, in the embodiment of the present application, by acquiring the lamination information of the circuit board of the radio frequency circuit, importing the lamination information into simulation software, and performing electromagnetic simulation in the simulation software to extract the scattering parameter of the radio frequency circuit, the running environment of the simulation software is an idealized environment, and by extracting the scattering parameter of the radio frequency circuit in a simulation manner, the influence of the using environment on the coefficient in the scattering parameter can be avoided, and the scattering parameter relatively close to the radio frequency circuit is obtained.
Fig. 7 is a flow chart of an interference positioning method according to another embodiment of the present application. Referring to fig. 7, step S3 includes steps S31 to S32.
S31: and obtaining the difference value between the maximum value of the isolation D1, the isolation D2 and the isolation D3 and the other two isolation.
Illustratively, referring to fig. 8, at the time of simulation, the set frequency freq is set to 2.110GHz, and isolation degrees are obtained by simulation as follows: d1 By virtue of the fact that the isolation degree D2 is the largest as shown in the following steps of = -91.934dB, D2 = -60.579dB and D3 = -94.629 dB; taking the difference between the isolation D2 and the isolation D1 to obtain d21= 31.355 (D21 represents the difference between the isolation D2 and the isolation D1); taking the difference between the isolation D2 and the isolation D3, d23= 34.05 is obtained (D23 represents the difference between the isolation D2 and the isolation D3).
S32: comparing the difference value with a first preset value, and if the difference value is larger than or equal to the first preset value, determining that the circuit segment corresponding to the biggest value among the isolation degree D1, the isolation degree D2 and the isolation degree D3 has interference.
Illustratively, the first preset value is di=30, and d21= 31.355 is greater than Di; d23 As can be seen from the fact that the isolation D2 corresponds to a circuit segment (i.e., the TX end is connected to the ANT end via the ground of the diplexer) with interference. 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 may indicate that the circuit segment corresponding to the maximum value has interference.
According to the embodiment of the application, the difference value between the maximum value of the isolation degrees D1, D2 and D3 and the other two isolation degrees is obtained, and compared with the first preset value, the circuit section with interference can be determined, and the method is simple and rapid.
Fig. 9 is a flow chart of an interference positioning method according to another embodiment of the present application. Step S3 includes S33:
s33: and comparing the isolation D1, the isolation D2 and the isolation D3 with second preset values respectively, and determining that the circuit section corresponding to the isolation greater than or equal to the second preset values has interference.
If the isolation degree which is larger 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 the circuit section which is larger than or equal to the second preset value has interference; if the isolation degree D1, the isolation degree D2 and the isolation degree D3 are smaller than the second preset value, no interference exists in the circuit section corresponding to the second preset value smaller than the second preset value.
Illustratively, referring to fig. 8, taking the second preset value of-85 dB as an example, the isolation degrees obtained by simulation are respectively: d1 The isolation D2 is greater than a second preset value, so that the circuit section with interference is a circuit section corresponding to the isolation D2 (i.e., a circuit section from the TX end to the ANT end via the grounding point of the duplexer).
And comparing the isolation D1, the isolation D2 and the isolation D3 with a second preset value respectively, and determining that the circuit section corresponding to the isolation greater than or equal to the second preset value has interference, wherein the method is simple and efficient.
Fig. 10 is a flowchart of an interference positioning method according to another embodiment of the present application. After determining the disturbed circuit section, referring to fig. 10, the method further comprises steps S41 to S42:
s41: and detecting the isolation degree of a circuit interval 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, which is away from the duplexer, in the interfered circuit section.
The circuit node is a connection point between each electronic component in the circuit. Taking fig. 10 as an example, in the circuit section from the ground point to the RX end of the duplexer, the circuit node includes a P1 point and a P2 point.
S42: and determining a specific interfered circuit section according to the isolation degree of the circuit section between the grounding point of each circuit node through the duplexer and the target port.
For example, referring to fig. 8 and 11, taking an interfered circuit section as a circuit section from a TX end to an ANT end through a grounding point of a duplexer, performing simulation test on a circuit section between a P1 point and a target port through the grounding point of the duplexer in simulation software to detect the isolation of the circuit section and obtain the isolation of-87.538 dB; i.e. after changing the detected circuit interval, the isolation is reduced from-60.579 dB to-87.538 dB, and still greater than the second preset value Di. Since the signal is transmitted from the P1 point to the ANT end via the ground point of the duplexer at the time of the simulation test, there is less power leakage in this signal flow direction, and thus it can be confirmed that when the aforementioned step detects the isolation of the circuit section from the TX end to the ANT end via the ground point of the duplexer, a large power leakage occurs when the signal reaches the point P1 from the TX end, and thus the isolation is large. When the isolation of the circuit section from the point P1 to the target port is detected, the power leakage is small, and thus the isolation is also reduced, whereby it is inferred that the power leakage occurs in the circuit section from the point TX to the point P1, and thus it is possible to determine that the interference exists in the circuit section from the point TX to the point P1.
On the contrary, if the isolation degree obtained after the simulation test is performed on the circuit interval between the grounding point of the duplexer and the target port at the point P1 is smaller, it can be proved that the power leakage does not occur in the circuit interval between the point P1 and the target port, so that the circuit interval between the TX end and the point P1 can be determined.
After determining that the interference is not in the circuit interval between the TX end and the P1 point, the detection circuit node P2 detects the isolation degree through the circuit interval between the grounding point of the duplexer and the target port, that is, the replacement circuit node, so that the circuit interval with the interference can be specifically determined.
Based on the embodiment of fig. 2, the present embodiment detects the isolation between each circuit junction of the interfered circuit segment and the circuit section between the target port, and can specifically determine the circuit section where the interference exists through the isolation, so that the process is simpler and more accurate.
In another embodiment of the present application, another method for locating interference is further provided, where after determining the interfered circuit segment, the isolation between each circuit node of the interfered circuit segment and the circuit interval between the ground point of the diplexer and the target port is detected according to a preset sequence, where the preset sequence is a connection sequence between each circuit node in the interfered circuit segment.
Taking fig. 3 as an example, the connection sequence of the circuit nodes is p1→p2, and of course, 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, firstly detecting the isolation degree of the circuit section between the grounding point of the P1 through the duplexer and the target port, and then detecting the isolation degree of the circuit section between the grounding point of the P1 through the duplexer and the target port.
According to the embodiment, the isolation degree of the circuit section between each circuit node of the interfered circuit section and the target port through the grounding point of the duplexer is detected according to the preset sequence, so that the specific interfered circuit section can be determined more rapidly.
The embodiment of fig. 9 only identifies 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 wire in the radio frequency circuit or the circuit section is interfered due to unreasonable setting of the attribute parameter of the electronic component. Therefore, another embodiment of the present application proposes an interference positioning method to locate a specific interfered position in a circuit interval. After determining the specific disturbed circuit section, referring to fig. 12, the method further comprises steps S51 to S53:
s51: and adjusting attribute parameters of the electronic components in simulation software.
The attribute parameter of the electronic component refers to a parameter corresponding to the type of the electronic component, for example, the attribute parameter of the inductance is an inductance value, the attribute parameter of the capacitance is a capacitance value, and the attribute parameter of the resistance is a resistance value.
Taking the interfered circuit interval as the circuit interval from the P2 end to the RX end as an example, adjusting the inductance value of the inductor in simulation software; the direction of adjustment (i.e., increase or decrease) may be determined by multiple measurements; the specific adjustment can be determined by multiple tests.
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 is interfered according to the isolation degree of the interfered circuit section after the attribute parameters are adjusted.
And comparing the isolation degrees before and after the attribute parameter adjustment to determine whether the isolation degrees are reduced, and if so, determining that the inductance in the circuit interval from the P2 end to the RX end is interfered.
According to the embodiment of the application, on the basis of the embodiment of fig. 9, the attribute parameters of the electronic components are adjusted in the simulation software, the isolation of the interfered circuit section after the attribute parameters are adjusted is detected, and the specific interfered position in the interfered circuit section can be determined according to the isolation of the interfered circuit section after the attribute parameters are adjusted.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (5)
1. An interference positioning method is used for carrying out interference positioning on a radio frequency circuit, and 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 enabling a transmitting end, a receiving end and an antenna end of a duplexer in the simulation circuit to be grounded;
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 the simulation software;
s3, obtaining the difference value between the maximum value of the isolation degree D1, the isolation degree D2 and the isolation degree D3 and the other two isolation degrees; comparing the difference value with a first preset value, and if the difference values are all larger than or equal to the first preset value, determining that the circuit segment corresponding to the biggest value among the isolation degree D1, the isolation degree D2 and the isolation degree D3 has interference;
s41, detecting the isolation degree of a circuit interval between each circuit node of the interfered circuit section and a target port through the grounding point of the duplexer according to a preset sequence in the simulation software, wherein the preset sequence is the connection sequence between each circuit node in the interfered circuit section, and the target port is a port deviating from the duplexer in the interfered circuit section;
s42, comparing the isolation degree of each circuit section with the isolation degree of the corresponding interfered circuit section; if the isolation degree changes greatly, determining that interference exists between a starting circuit node of the circuit interval and another port except the target port; if the isolation change is small, it is determined that interference does not exist in the circuit interval between the starting circuit node of the circuit interval and another port except the target port.
2. The interference positioning method according to claim 1, wherein the step S3 comprises:
and comparing the isolation D1, the isolation D2 and the isolation D3 with a second preset value respectively, and determining that the circuit section corresponding to the isolation greater than or equal to the second preset value has interference.
3. The method of claim 1, wherein electronic components are disposed within the interfered circuit interval, and wherein after the determining the interfered circuit interval in the radio frequency circuit, the method further comprises:
adjusting attribute parameters of the electronic components in the simulation software;
detecting the isolation degree of the interfered circuit interval after the attribute parameter is adjusted in the simulation software;
and determining whether the electronic component is interfered according to the isolation degree of the interfered circuit interval after the attribute parameters are adjusted.
4. The interference positioning method according to claim 1, wherein the S2 comprises:
acquiring scattering parameters of the radio frequency circuit;
the scattering parameters are imported into the simulation software, and simulation test is carried out 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.
5. The method of claim 4, wherein the obtaining the scattering parameters of the radio frequency circuit comprises:
acquiring lamination information of a circuit board of the radio frequency circuit;
and importing the lamination information into simulation software, and performing electromagnetic simulation in the simulation software to extract scattering parameters of the radio frequency circuit.
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