CN109120353B - Radio frequency circuit simulation method, radio frequency circuit simulation device, and storage medium - Google Patents
Radio frequency circuit simulation method, radio frequency circuit simulation device, and storage medium Download PDFInfo
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- CN109120353B CN109120353B CN201810791350.2A CN201810791350A CN109120353B CN 109120353 B CN109120353 B CN 109120353B CN 201810791350 A CN201810791350 A CN 201810791350A CN 109120353 B CN109120353 B CN 109120353B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
- H04B17/0087—Monitoring; Testing using service channels; using auxiliary channels using auxiliary channels or channel simulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/006—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using switches for selecting the desired band
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
- H04B17/3912—Simulation models, e.g. distribution of spectral power density or received signal strength indicator [RSSI] for a given geographic region
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Abstract
The application discloses a radio frequency circuit simulation method, this method is used for simulating the radio frequency circuit, the radio frequency circuit includes radio frequency transceiver, PA, first LNA, selector switch, coupler, first filter, 4P4T switch, second LNA, third LNA, fourth LNA, second filter, third filter, fourth filter, first antenna, second antenna, third antenna, fourth antenna, this method includes: assuming a first impedance value of the selector switch near the port of the first LNA; assuming a second impedance value at the input of the first LNA; establishing a first two-port network model, wherein a first port of the first two-port network model is used as an input end of a first LNA, and a second port of the first two-port network model is used as an output end of a selector switch; and on the premise that the first two-port network model meets impedance matching, simulating the first two-port network model to obtain a first matching network. By adopting the embodiment of the application, the simulation efficiency can be improved.
Description
Technical Field
The present application relates to the field of simulation technologies, and in particular, to a radio frequency circuit simulation method, a radio frequency circuit simulation apparatus, and a storage medium.
Background
The third Generation mobile communication technology (3rd-Generation, 3G) communication and the fourth Generation mobile communication technology (4 th-Generation, 4G) communication of a mobile terminal (such as a smart phone) are mainly divided into two communication modes, namely Frequency Division Duplex (FDD) and Time Division Duplex (TDD), wherein FDD transmit-receive paths can realize simultaneous transmit and receive operation without interference. In the debugging process, the radio frequency performance of the corresponding FDD frequency band is often optimized by optimizing the matching of the common terminal in the transceiving path. In the conventional method, after a Printed Circuit Board (PCB) is returned, a vector network analyzer is used to analyze scattering parameters of a channel, so as to select a suitable radio frequency matching to achieve the best performance. At present, dozens of matching forms can be replaced in the debugging process to carry out debugging back and forth, and the debugging mode is complex and consumes long time.
Disclosure of Invention
The embodiment of the application discloses a radio frequency circuit simulation method, a radio frequency circuit simulation device and a storage medium, which are used for improving simulation efficiency.
In a first aspect, an embodiment of the present application discloses a method for simulating a radio frequency circuit,
the method is for emulating a radio frequency circuit comprising a radio frequency transceiver, a power amplifier PA, a first low noise amplifier LNA, a selection switch, a coupler, a first filter, a 4P4T switch, a second LNA, a third LNA, a fourth LNA, a second filter, a third filter, a fourth filter, a first antenna, a second antenna, a third antenna, a fourth antenna, the radio frequency transceiver, the PA, the selection switch, the first filter, the coupler, and the 4P4T switch form a transmit path, the 4P4T switch, the coupler, the first filter, the selection switch, the first LNA and the RF transceiver constitute a first RF receive path, the 4P4T switch, the second filter, the second LNA, and the radio frequency transceiver forming a second radio frequency receive path, the method comprising:
assuming a first impedance value of the selector switch near the port of the first LNA; assuming a second impedance value at the input of the first LNA;
establishing a first two-port network model, wherein a first port of the first two-port network model is used as an input end of the first LNA, and a second port of the first two-port network model is used as an output end of the selector switch;
and on the premise that the first two-port network model meets impedance matching, simulating the first two-port network model to obtain a first matching network.
In a second aspect, the embodiments of the present application disclose a radio frequency circuit simulation apparatus for simulating a radio frequency circuit, the radio frequency circuit including a radio frequency transceiver, a power amplifier PA, a first low noise amplifier LNA, a selection switch, a coupler, a first filter, a 4P4T switch, a second LNA, a third LNA, a fourth LNA, a second filter, a third filter, a fourth filter, a first antenna, a second antenna, a third antenna, and a fourth antenna, the radio frequency transceiver, the PA, the selection switch, the first filter, the coupler, the 4P4T switch constituting a transmit path, the 4P4T switch, the coupler, the first filter, the selection switch, the first LNA, and the radio frequency transceiver constituting a first radio frequency receive path, the 4P4T switch, the second filter, the second LNA, and the radio frequency transceiver constituting a second radio frequency receive path, the radio frequency circuit simulation device comprises:
an assumption unit for assuming a first impedance value of the selector switch near the port of the first LNA; assuming a second impedance value at the input of the first LNA;
the modeling unit is used for establishing a first two-port network model, wherein a first port of the first two-port network model is used as an input end of the first LNA, and a second port of the first two-port network model is used as an output end of the selector switch;
and the simulation unit is used for simulating the first two-port network model to obtain a first matching network on the premise that the first two-port network model meets impedance matching.
In a third aspect, an embodiment of the present application discloses a radio frequency circuit simulation apparatus, including a processor, a memory, a communication interface, and one or more programs, where the one or more programs are stored in the memory and configured to be executed by the processor, and the program includes instructions for executing steps in the method according to the first aspect of the embodiment of the present application.
In a fourth aspect, an embodiment of the present application discloses a computer-readable storage medium, where the computer-readable storage medium stores a computer program for electronic data exchange, where the computer program enables a computer to perform some or all of the steps described in the method according to the first aspect of the embodiment of the present application.
In a fifth aspect, embodiments of the present application disclose a computer program product, wherein the computer program product comprises a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to perform some or all of the steps described in the method according to the first aspect of the embodiments of the present application. The computer program product may be a software installation package.
It can be seen that in the embodiment of the present application, first, a first impedance value of the selection switch near the port of the first LNA is assumed; and assuming a second impedance value of the input end of the first LNA, then establishing a first two-port network model, and simulating the first two-port network model to obtain a first matching network. Therefore, the radio frequency circuit simulation method based on the 4P4T switch is flexible in operation, matching simulation of the first receiving path can be accurately completed only through reasonable modeling, and simulation efficiency is improved.
These and other aspects of the present application will be more readily apparent from the following description of the embodiments.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a radio frequency circuit disclosed in an embodiment of the present application;
fig. 2 is a schematic flowchart of a radio frequency circuit simulation method according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a first two-port network model disclosed in an embodiment of the present application;
fig. 4 is a schematic structural diagram of a first matching network disclosed in an embodiment of the present application;
fig. 5 is a schematic structural diagram of another first matching network disclosed in the embodiment of the present application;
FIG. 6 is a schematic flow chart diagram illustrating another method for simulating an RF circuit according to an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of an optimal impedance region of a Smith artwork according to an embodiment of the present application;
FIG. 8 is a schematic flow chart diagram illustrating another method for simulating an RF circuit according to an embodiment of the present disclosure;
fig. 9 is a schematic structural diagram of an rf circuit emulation apparatus according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of another radio frequency circuit simulation apparatus disclosed in the embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, 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 only partial embodiments of the present application, but not all embodiments. 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.
The following are detailed below.
The terms "first," "second," "third," and "fourth," etc. in the description and claims of this application and in the accompanying drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a radio frequency circuit disclosed in an embodiment of the present application. As shown in fig. 1, the rf circuit 100 includes an rf transceiver 11, a Power Amplifier (PA) 12, a selection switch 13, a coupler 14, a first Low Noise Amplifier (LNA) 15, a 4P4T switch 16, a second LNA17, a third LNA18, a fourth LNA19, a first filter 21, a second filter 22, a third filter 23, a fourth filter 24, a first antenna 25, a second antenna 26, a third antenna 27, and a fourth antenna 28. The rf transceiver 11, PA12, selection switch 13, first filter 21, coupler 14, 4P4T switch 16 constitute a transmit path, the 4P4T switch 16, coupler 14, first filter 21, selection switch 13, first LNA15 and rf transceiver 11 constitute a first rf receive path, the 4P4T switch 16, second filter 22, second LNA17 and rf transceiver 11 constitute a second rf receive path, the 4P4T switch 16, third filter 23, third LNA18 and rf transceiver 11 constitute a third rf receive path, and the 4P4T switch 16, fourth filter 24, fourth LNA19 and rf transceiver 11 constitute a fourth rf receive path. Specifically, the rf transceiver 11 includes a first receiving terminal RX1, a second receiving terminal RX2, a third receiving terminal RX3, a fourth receiving terminal RX4, and a transmitting terminal TX. The first receiving terminal RX1 is connected to the output terminal of the first LNA15, the input terminal of the first LNA15 is connected to the output terminal of the selector switch 13, the common terminal of the selector switch 13 is connected to the first terminal of the first filter 21, the second terminal of the first filter 21 is connected to the first T port (e.g., the T1 port shown in fig. 1) of the 4P4T switch 16, the first T port of the 4P4T switch 16 can be selectively connected to any one of the 4P ports (e.g., the P1 port, the P2 port, the P3 port and the P4 port shown in fig. 1) of the 4P4T switch 16, and the P1 port is connected to the first antenna 25; the transmitting end TX is connected with the input end of the PA12, and the output end of the PA12 is connected with the output end of the selection switch 13; the second receiving terminal RX2 is connected to the output terminal of the second LNA17, the input terminal of the second LNA17 is connected to the output terminal of the second filter 22, the input terminal of the second filter 22 is connected to a second T port (e.g., the T2 port shown in fig. 1) of the 4P4T switch 16, the second T port can be selectively connected to any one of 4P ports (e.g., the P1 port, the P2 port, the P3 port, and the P4 port shown in fig. 1) of the 4P4T switch 16, and the P2 port is connected to the second antenna 26; the third receiving terminal RX3 is connected to the output terminal of the third LNA18, the input terminal of the third LNA18 is connected to the output terminal of the third filter 23, the input terminal of the third filter 23 is connected to the third T port (e.g., the T3 port shown in fig. 1) of the 4P4T switch 16, the third T port can be selectively connected to any one of the 4P ports (e.g., the P1 port, the P2 port, the P3 port, and the P4 port shown in fig. 1) of the 4P4T switch 16, and the P3 port is connected to the third antenna 27; the fourth receiving terminal RX4 is connected to the output terminal of the fourth LNA19, the input terminal of the fourth LNA19 is connected to the output terminal of the fourth filter 24, the input terminal of the fourth filter 24 is connected to the fourth T port (e.g., the T4 port shown in fig. 1) of the 4P4T switch 16, the fourth T port is selectively connected to any one of the 4P ports (e.g., the P1 port, the P2 port, the P3 port, and the P4 port shown in fig. 1) of the 4P4T switch 16, and the P4 port is connected to the fourth antenna 28.
The first rf receiving path is configured to transmit the rf signal received by the first T port of the 4P4T switch 16 to the rf transceiver 11; the second rf receiving path is used for transmitting the rf signal received by the second T port of the 4P4T switch 16 to the rf transceiver 11; the third rf receiving path is configured to transmit the rf signal received by the third T port of the 4P4T switch 16 to the rf transceiver 11; the fourth rf receiving path is configured to transmit the rf signal received by the fourth T port of the 4P4T switch 16 to the rf transceiver 11; the transmission path is used for transmitting the rf signal transmitted by the rf transceiver 11 through the PA12, the selection switch 13, the first filter 21, the coupler 14, and the 4P4T switch 16.
The radio frequency signal may be a radio frequency signal in an LTE Band, for example, TDD-LTE Band38, Band39, Band40, and Band41, FDD-LTE Band1, Band3, and Band 7. The radio frequency signal may be a radio frequency signal of a 3G Band, for example, Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) Band34 and Band39, Wideband Code Division Multiple Access (WCDMA) Band1, Band2, Band5, and Band 8. The radio frequency signal may be a radio frequency signal in a 2G Band, and the 2G Band includes, for example, Global System for Mobile Communication (GSM) Band2, Band3, Band5, and Band 8. The radio frequency signal may also be a radio frequency signal of a 5G frequency band, such as a radio frequency signal of a 3.3GHz-3.8GHz band, a 4.4GHz-5GHz band.
The rf transceiver 11 is a device capable of receiving and transmitting rf signals.
The PA12 is used to amplify the rf signal emitted from the rf transceiver 11, so as to ensure that the rf signal can be fed to the antenna for transmission. The PA12 may be a Multi-mode Multi-band Power Amplifier (MMPA), and may amplify radio frequency signals in multiple frequency bands.
The 4P4T switch 16 is used to connect four antennas with four T ports, so as to implement three-way reception and one-way transmission, or implement four-way transmission.
The selection switch 13 may be a single-pole double-throw switch for determining that the common terminal of the selection switch 13 is connected to the output terminal of the selection switch 13 or the output terminal of the selection switch 13.
The following describes embodiments of the present application in detail.
The radio frequency circuit 100 is applied to a Mobile terminal, which may include various handheld devices, vehicle-mounted devices, wearable devices (e.g., smartwatches, smartbands, pedometers, etc.), computing devices or other processing devices connected to a wireless modem, and various forms of User Equipment (UE), Mobile Stations (MS), terminal devices (terminal device), and so on. The Mobile terminal may also be a 5G New Radio (NR) handset terminal or other 5G NR terminal device, such as Customer Premise Equipment (CPE) or portable broadband wireless Equipment (MIFI).
For convenience of description, the above-mentioned devices are collectively referred to as a mobile terminal.
Referring to fig. 2, fig. 2 is a schematic flow chart of a radio frequency circuit simulation method for debugging the radio frequency circuit according to an embodiment of the present application, and the radio frequency circuit simulation method includes the following steps.
The radio frequency circuit emulation device assumes a first impedance value of the selector switch near the port of the first LNA 201; assume a second impedance value at the input of the first LNA.
In the embodiment of the application, when performing radio frequency simulation, parameter assumption is made first. The purpose of the parameter assumptions is to prepare for two-port simulations, which are simulated based on assumed parameters. A first impedance value of the port of the selector switch proximate to the first LNA may be determined based on an impedance matching network of the common terminal of the selector switch. Specifically, on the premise that the standing wave ratio of the selector switch satisfies a first preset condition, a first impedance value of the selector switch close to the port of the first LNA may be determined based on an impedance matching network of the common terminal of the selector switch. The first preset condition may be that the standing wave ratio of the selection switch is less than 1.5.
The second impedance value of the input of the first LNA may be determined based on the first LNA, for example, if the first LNA is manufactured according to a matching impedance standard of 50 ohms when manufactured by a process, assuming that the first LNA is good, the second impedance value of the input of the first LNA may be determined to be 50 ohms.
When the first receiving path is simulated, the common terminal (for example, the common terminal of the selection switch) in the first receiving path is simulated first, and then other simulations are performed. Since the public end has both receiving and transmitting functions, the simulation of the public end needs to meet the performance requirements of radio frequency signal receiving and radio frequency signal transmitting at the same time. If the public end does not perform simulation first, the subsequent simulation has no significance.
202, the radio frequency circuit simulation device establishes a first two-port network model, a first port of the first two-port network model is used as an input end of the first LNA, and a second port of the first two-port network model is used as an output end of the selector switch.
203, the radio frequency circuit simulation device simulates the first two-port network model to obtain a first matching network on the premise that the first two-port network model meets impedance matching.
The two-port network model refers to a multi-port network with the port number equal to 2, wherein one port of the two-port network is an input port and used for receiving signals or energy, and the other port of the two-port network is an output port and used for outputting signals or energy.
Specifically, the first two-port network model is shown in fig. 3, and the two-port network model includes a first port, a second port, and a device model, where a resistor is disposed at each of the first port and the second port, and an impedance value of the resistor at the first port is equal to 50 ohms. The impedance value of the resistance of the second port is assumed to be obtained based on the above step 201, for example, assuming that the impedance value of the resistance of the second port is 35-j × 5 ohms.
In the first two-port network model, under the condition that the first two-port network model meets impedance matching and the impedance values of the two ports are also known, the first matching network of the first two-port network model can be directly simulated through simulation software. The simulation software is, for example, Advanced Design System (ADS) simulation software.
The first matching network may be a matching network composed of a capacitor and an inductor. For example, the first matching network may be a "pi" type matching network. Please refer to fig. 4.
The first matching network can also be a matching network consisting of a capacitor, an inductor and a microstrip line. Please refer to fig. 5. The microstrip line may cause a variation in a scattering parameter of the first matching network, and therefore needs to be considered to achieve more accurate matching. Microstrip lines are understood to be a simulation model of the connecting lines between two elements.
It should be noted that the first two-port network model is not limited to the structure shown in fig. 3, and the structure shown in fig. 3 is only an example disclosed in the present application.
The radio frequency circuit simulation method disclosed by the embodiment of the application is flexible in operation, matching simulation of the first receiving channel can be accurately completed only by reasonable modeling, and the simulation efficiency is improved.
Referring to fig. 6, fig. 6 is a schematic flowchart of another radio frequency circuit simulation method for debugging the radio frequency circuit according to an embodiment of the present application, where the radio frequency circuit simulation method includes the following steps.
601, the radio frequency circuit simulation device assumes a first impedance value of a selection switch close to a port of a first LNA; assume a second impedance value at the input of the first LNA.
And 602, the radio frequency circuit simulation device establishes a first two-port network model, wherein a first port of the first two-port network model is used as an input end of a first LNA, and a second port of the first two-port network model is used as an output end of a selector switch.
603, the radio frequency circuit simulation device simulates the first two-port network model to obtain a first matching network on the premise that the first two-port network model meets impedance matching.
The specific implementation of steps 601 to 603 in this embodiment may refer to steps 201 to 203 in the embodiment of fig. 2, which is not described herein again.
604, the rf circuit simulation apparatus adjusts the values of the elements of the first matching network so that the scattering parameters of the first two-port network model satisfy a second predetermined condition.
The element values of the first matching network specifically refer to the magnitudes of the inductance and the capacitance in the first matching network.
The scattering parameters, which may also be referred to as S-parameters, are used to estimate the information of the amplitude and phase of the reflected and transmitted signals, and the S-parameters mainly include S11, S12, S21, and S22. Wherein, S12 is used to represent the inverse isolation in transmission and is used to describe the effect of the signal at the output of the device on the input. S21 is used to indicate gain in transmission, which is an increase in load power due to the insertion of an element or device, or insertion loss, which is a loss in load power due to the insertion of an element or device. S11 is used to indicate the return loss of the input end, and can be described as the ratio of the incident power to the reflected power of the rf signal at the input end. S22 is used to indicate the return loss of the output end, and can be described as the ratio of the incident power to the reflected power of the rf signal at the output end. S11, which may also be referred to as Input Reflection Coefficient (Input Reflection Coefficient).
Specifically, the scattering parameter satisfies the second predetermined condition, and may be that in the smith chart, S11 is located in an optimal impedance region formed by the noise coefficient minimum point, the gain maximum point, and the conjugate matching point of the first LNA. See in particular the optimal impedance region of the smith chart shown in figure 7.
605, the radio frequency circuit simulation apparatus welds the first matching circuit corresponding to the first matching network to the printed circuit board PCB for actual test, so as to obtain a test result.
And 606, fine tuning the first matching circuit by the radio frequency circuit simulation device according to the test result to obtain the fine tuned first matching circuit.
In the embodiment of the application, after the first matching circuit is simulated through simulation software, the first matching circuit is welded on the PCB for actual test to obtain a test result, and then fine tuning is performed based on the test result, so that more accurate matching parameters can be obtained, and the simulation accuracy is further improved.
The radio frequency circuit simulation apparatus is a computer device with simulation software installed therein, and the computer device may be, for example, a computer, a notebook, a tablet computer, an industrial computer, a mobile terminal, and the like.
In the embodiment of the application, the radio frequency circuit simulation operation is flexible, the matching simulation of the first receiving channel can be accurately completed only by reasonable modeling, the simulation efficiency is improved, verification and fine tuning are performed by combining a PCB (printed Circuit Board), the verification of a radio frequency simulation result can be performed, and the radio frequency debugging efficiency is improved.
Referring to fig. 8, fig. 8 is a schematic flowchart of another radio frequency circuit simulation method for debugging the radio frequency circuit according to an embodiment of the present application, where the radio frequency circuit simulation method includes the following steps.
801, the radio frequency circuit emulation device assumes a first impedance value of the selector switch near the port of the first LNA; assume a second impedance value at the input of the first LNA.
And 802, the radio frequency circuit simulation device establishes a first two-port network model, wherein a first port of the first two-port network model is used as an input end of a first LNA, and a second port of the first two-port network model is used as an output end of a selector switch.
803, the radio frequency circuit simulation device simulates the first two-port network model to obtain the first matching network on the premise that the first two-port network model meets the impedance matching.
And 804, adjusting the element values of the first matching network by the radio frequency circuit simulation device so that the scattering parameters of the first two-port network model meet a second preset condition.
805, the radio frequency circuit simulation apparatus welds the first matching circuit corresponding to the first matching network to the printed circuit board PCB for actual testing, and obtains a test result.
806, the radio frequency circuit simulation apparatus performs fine tuning on the first matching circuit according to the test result to obtain the first matching circuit after fine tuning.
Step 801 to step 806 may refer to step 601 to step 606 shown in fig. 6, which is not described herein again.
807, the radio frequency circuit emulation device assumes a third impedance value of the second filter near the port of the second LNA; assume a fourth impedance value at the input of the second LNA.
808, the rf circuit simulation apparatus establishes a second two-port network model, a first port of the second two-port network model is used as an input end of the second LNA, and a second port of the second two-port network model is used as an output end of the second filter.
And 809, the radio frequency circuit simulation device simulates the second port network model to obtain a second matching network on the premise that the second port network model meets the impedance matching.
Optionally, a third receiving path and a fourth receiving path may also be simulated, and the specific implementation is similar to steps 807 to 809, which is not described herein again.
Optionally, after step 809 is executed, the following steps may also be executed:
(11) the radio frequency circuit simulation device adjusts the element values of the second matching network so that the scattering parameters of the second port network model meet a third preset condition.
Step (11) may specifically refer to step 804, which is not described herein again.
Optionally, after the step (11) is executed, the following steps may also be executed:
(21) the radio frequency circuit simulation device welds a second matching circuit corresponding to the second matching network on the printed circuit board PCB for actual test to obtain a second test result;
(21) and the radio frequency circuit simulation device finely adjusts the second matching circuit according to the second test result to obtain the finely adjusted second matching circuit.
For details of step (21) and step (22), reference may be made to step 805 and step 806, which are not described herein again.
It should be noted that steps 801 to 806 may be executed before, after, or simultaneously with steps 807 to 809, and embodiments of the present application are not limited.
In the embodiment of the application, the radio frequency circuit simulation operation is flexible, the matching simulation of the first receiving channel and the second receiving channel can be accurately completed only by reasonable modeling, the simulation efficiency is improved, and the verification and the fine tuning are performed by combining a PCB (printed Circuit Board), so that the verification of a radio frequency simulation result can be performed, and the radio frequency debugging efficiency is improved.
In accordance with the embodiments shown in fig. 2, fig. 6, and fig. 8, please refer to fig. 9, and fig. 9 is a schematic structural diagram of a radio frequency circuit emulation apparatus 900 disclosed in an embodiment of the present application, where the radio frequency circuit emulation apparatus 900 is used for debugging the radio frequency circuit shown in fig. 1, and as shown in the figure, the radio frequency circuit emulation apparatus 900 includes a processor 901, a memory 902, a communication interface 903, and one or more programs, where the one or more programs are stored in the memory and configured to be executed by the processor 901, and the programs include instructions for performing the following steps:
assuming a first impedance value of the selector switch near the port of the first LNA; assuming a second impedance value at the input of the first LNA;
establishing a first two-port network model, wherein a first port of the first two-port network model is used as an input end of the first LNA, and a second port of the first two-port network model is used as an output end of the selector switch;
and on the premise that the first two-port network model meets impedance matching, simulating the first two-port network model to obtain a first matching network.
Optionally, the program further includes instructions for performing the following steps:
on the premise that the standing-wave ratio of the selector switch meets a first preset condition, determining a first impedance value of the selector switch close to the port of the first LNA based on an impedance matching network of a common end of the selector switch.
Optionally, the program further includes instructions for performing the following steps:
and adjusting the element value of the first matching network so that the scattering parameter of the first two-port network model meets a second preset condition.
Optionally, the program further includes instructions for performing the following steps:
welding a first matching circuit corresponding to the first matching network on a Printed Circuit Board (PCB) for actual test to obtain a test result;
and carrying out fine adjustment on the first matching circuit according to the test result to obtain the first matching circuit after fine adjustment.
Optionally, the program further includes instructions for performing the following steps:
assuming that the second filter is near a third impedance value of the port of the second LNA; assuming a fourth impedance value at the input of the second LNA;
establishing a second two-port network model, wherein a first port of the second two-port network model is used as an input end of the second LNA, and a second port of the second two-port network model is used as an output end of the second filter;
and on the premise that the second port network model meets impedance matching, simulating the second port network model to obtain a second matching network.
Optionally, the program further includes instructions for performing the following steps:
and adjusting the element values of the second matching network so that the scattering parameters of the second port network model meet a third preset condition.
Optionally, the program further includes instructions for performing the following steps:
welding a second matching circuit corresponding to the second matching network on a Printed Circuit Board (PCB) for actual test to obtain a second test result;
and fine-tuning the second matching circuit according to the second test result to obtain the fine-tuned second matching circuit.
It should be noted that, for the specific implementation process of the present embodiment, reference may be made to the specific implementation process described in the above method embodiment, and a description thereof is omitted here.
The radio frequency circuit simulation device disclosed by the embodiment of the application can accurately complete the matching simulation of the first receiving channel, and the simulation efficiency is improved.
The above embodiments mainly introduce the scheme of the embodiments of the present application from the perspective of the method-side implementation process. It is understood that the radio frequency circuit emulation apparatus includes corresponding hardware structures and/or software modules for performing the respective functions in order to implement the above-described functions. Those of skill in the art would readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiment of the present application, the radio frequency circuit simulation apparatus may be divided into the functional units according to the method example, for example, each functional unit may be divided corresponding to each function, or two or more functions may be integrated into one processing unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit. It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation.
The following is an embodiment of the apparatus of the present application, which is used to execute the method implemented by the embodiment of the method of the present application. Referring to fig. 10, fig. 10 is a schematic structural diagram of another radio frequency circuit simulation apparatus disclosed in the embodiment of the present application, the radio frequency circuit simulation apparatus 1000 is used for debugging the radio frequency circuit, the radio frequency circuit simulation apparatus 1000 includes a hypothetical unit 1001, a modeling unit 1002, and a simulation unit 1003, where:
an assumption unit 1001 for assuming a first impedance value of the selection switch near the port of the first LNA; assume a second impedance value at the input of the first LNA.
The modeling unit 1002 is configured to establish a first two-port network model, where a first port of the first two-port network model is used as an input end of the first LNA, and a second port of the first two-port network model is used as an output end of the selector switch.
The simulation unit 1003 is configured to simulate the first two-port network model on the premise that the first two-port network model meets impedance matching, so as to obtain a first matching network.
The specific implementation of the radio frequency circuit simulation apparatus 1000 may refer to the method embodiment shown in fig. 2, and is not described herein again.
It is to be noted that the unit 1001, the modeling unit 1002, and the simulation unit 1003 may be implemented by a processor in fig. 9.
The radio frequency circuit simulation device disclosed by the embodiment of the application can accurately complete the matching simulation of the first receiving channel, and the simulation efficiency is improved.
The embodiment of the application also discloses a computer storage medium, wherein the computer storage medium stores a computer program for electronic data exchange, the computer program enables a computer to execute part or all of the steps of any method described in the method embodiment, and the computer comprises a radio frequency circuit simulation device.
Embodiments of the present application also disclose a computer program product comprising a non-transitory computer readable storage medium storing a computer program operable to cause a computer to perform some or all of the steps of any of the methods as described in the above method embodiments. The computer program product may be a software installation package, said computer comprising radio frequency circuit emulation means.
It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present application is not limited by the order of acts described, as some steps may occur in other orders or concurrently depending on the application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments disclosed in the present application, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the above-described division of the units is only one type of division of logical functions, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some interfaces, devices or units, and may be an electric or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit may be stored in a computer readable memory if it is implemented in the form of a software functional unit and sold or used as a stand-alone product. Based on such understanding, the technical solution of the present application may be substantially implemented or a part of or all or part of the technical solution contributing to the prior art may be embodied in the form of a software product stored in a memory, and including several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the above-mentioned method of the embodiments of the present application. And the aforementioned memory comprises: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable memory, which may include: flash Memory disks, Read-Only memories (ROMs), Random Access Memories (RAMs), magnetic or optical disks, and the like.
The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the above description of the embodiments is only provided to help understand the method and the core concept of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (8)
1. A method of simulating a radio frequency circuit, the method being for simulating a radio frequency circuit, the radio frequency circuit comprising a radio frequency transceiver, a Power Amplifier (PA), a first Low Noise Amplifier (LNA), a selector switch, a coupler, a first filter, a 4P4T switch, a second LNA, a third LNA, a fourth LNA, a second filter, a third filter, a fourth filter, a first antenna, a second antenna, a third antenna, a fourth antenna, the radio frequency transceiver, the PA, the selector switch, the first filter, the coupler, the 4P4T switch constituting a transmit path, the 4P4T switch, the coupler, the first filter, the selector switch, the first LNA and the radio frequency transceiver constituting a first radio frequency receive path, the 4P4T switch, the second filter, the second LNA and the radio frequency transceiver constituting a second radio frequency receive path, the method comprises the following steps:
on the premise that the standing-wave ratio of the selector switch meets a first preset condition, determining a first impedance value of a port of the selector switch close to the first LNA based on an impedance matching network of a common end of the selector switch; assuming a second impedance value at the input of the first LNA; a second impedance value of an input of the first LNA is determined based on the first LNA; the first preset condition includes: the standing-wave ratio of the selection switch is less than 1.5;
establishing a first two-port network model, wherein a first port of the first two-port network model is used as an input end of the first LNA, and a second port of the first two-port network model is used as an output end of the selector switch;
on the premise that the first two-port network model meets impedance matching, simulating the first two-port network model to obtain a first matching network;
adjusting element values of the first matching network so that scattering parameters of the first two-port network model meet a second preset condition, wherein the scattering parameters comprise S11;
the second preset condition includes: in the smith chart, S11 is located in the optimal impedance region formed by the noise coefficient minimum point, the gain maximum point and the conjugate matching point of the first LNA, and S11 is used to indicate the return loss of the input terminal.
2. The method of claim 1, wherein after adjusting the element values of the first matching network to make the scattering parameters of the first two-port network model satisfy a second preset condition, the method further comprises:
welding a first matching circuit corresponding to the first matching network on a Printed Circuit Board (PCB) for actual test to obtain a test result;
and carrying out fine adjustment on the first matching circuit according to the test result to obtain the first matching circuit after fine adjustment.
3. The method according to any one of claims 1-2, further comprising:
assuming that the second filter is near a third impedance value of the port of the second LNA; assuming a fourth impedance value at the input of the second LNA;
establishing a second two-port network model, wherein a first port of the second two-port network model is used as an input end of the second LNA, and a second port of the second two-port network model is used as an output end of the second filter;
and on the premise that the second port network model meets impedance matching, simulating the second port network model to obtain a second matching network.
4. The method of claim 3, wherein after the simulating the second port network model to obtain a second matching network, the method further comprises:
and adjusting the element values of the second matching network so that the scattering parameters of the second port network model meet a third preset condition.
5. The method of claim 4, wherein after adjusting the element values of the second matching network to make the scattering parameters of the second port network model satisfy a third preset condition, the method further comprises:
welding a second matching circuit corresponding to the second matching network on a Printed Circuit Board (PCB) for actual test to obtain a second test result;
and fine-tuning the second matching circuit according to the second test result to obtain the fine-tuned second matching circuit.
6. A radio frequency circuit emulation apparatus, the apparatus being configured to emulate a radio frequency circuit including a radio frequency transceiver, a Power Amplifier (PA), a first Low Noise Amplifier (LNA), a selector switch, a coupler, a first filter, a 4P4T switch, a second LNA, a third LNA, a fourth LNA, a second filter, a third filter, a fourth filter, a first antenna, a second antenna, a third antenna, a fourth antenna, the radio frequency transceiver, the PA, the selector switch, the first filter, the coupler, the 4P4T switch constituting a transmit path, the 4P4T switch, the coupler, the first filter, the selector switch, the first LNA and the radio frequency transceiver constituting a first radio frequency receive path, the 4P4T switch, the second filter, the second LNA and the radio frequency transceiver constituting a second radio frequency receive path, the radio frequency circuit simulation device comprises:
a presumption unit, configured to determine a first impedance value of the selector switch near a port of the first LNA based on an impedance matching network of a common terminal of the selector switch on the premise that a standing-wave ratio of the selector switch satisfies a first preset condition; assuming a second impedance value at the input of the first LNA; a second impedance value of an input of the first LNA is determined based on the first LNA; the first preset condition includes: the standing-wave ratio of the selection switch is less than 1.5;
the modeling unit is used for establishing a first two-port network model, wherein a first port of the first two-port network model is used as an input end of the first LNA, and a second port of the first two-port network model is used as an output end of the selector switch;
the simulation unit is used for simulating the first two-port network model to obtain a first matching network on the premise that the first two-port network model meets impedance matching;
an adjusting unit, configured to adjust element values of the first matching network so that a scattering parameter of the first two-port network model satisfies a second preset condition, where the scattering parameter includes S11;
the second preset condition includes: in the smith chart, S11 is located in the optimal impedance region formed by the noise coefficient minimum point, the gain maximum point and the conjugate matching point of the first LNA, and S11 is used to indicate the return loss of the input terminal.
7. A radio frequency circuit emulation device comprising a processor, a memory, a communication interface, and one or more programs stored in the memory and configured for execution by the processor, the programs comprising instructions for performing the steps in the method of any of claims 1-5.
8. A computer-readable storage medium, characterized in that a computer program for electronic data exchange is stored, wherein the computer program causes a computer to perform the method according to any one of claims 1-5.
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| CN110518931A (en) * | 2019-07-25 | 2019-11-29 | 维沃移动通信有限公司 | A kind of switching molding group, radio-frequency unit and terminal device |
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| CN105975731A (en) * | 2016-06-20 | 2016-09-28 | 中国科学院深圳先进技术研究院 | Magnetic resonance radio frequency coil simulation method and device |
| CN106209282A (en) * | 2016-06-29 | 2016-12-07 | 宇龙计算机通信科技(深圳)有限公司 | Radio circuit and terminal |
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