CN115470735B - Method, system and related equipment for SAW physical simulation - Google Patents

Abstract

The invention belongs to the field of wireless communication, and particularly relates to a SAW physical simulation method, a SAW physical simulation system and related equipment, wherein the SAW physical simulation method comprises the following steps: determining basic parameters of the finger; constructing different simulation finger bar objects according to the basic parameters and the preset space positions; connecting different simulation finger objects according to a preset electrical rule to obtain a plurality of simulation resonator objects, and calculating electrical response parameters of each simulation resonator object; connecting different simulation resonator objects with the circuit matching element object according to a preset electrical rule to obtain a simulation filter unit, and calculating the overall electrical response parameters of the simulation filter unit according to the electrical response parameters corresponding to the simulation resonator objects used in connection; coupling the simulation filter unit with a scattering matrix of the radio frequency front end object according to a preset electrical rule to obtain a physical simulation result of the simulation radio frequency front end module formed by the simulation filter unit. The invention realizes the integration of SAW physical simulation schemes.

Description

Method, system and related equipment for SAW physical simulation

technical field

The invention belongs to the field of wireless communication, and in particular relates to a SAW physical simulation method, system and related equipment.

Background technique

Whether the design of SAW (Surface Acoustic Wave, referred to as SAW) is reliable depends largely on the accuracy of its physical simulation model. In terms of type, the physical simulation of SAW can be roughly divided into equivalent circuit models ( MBVD), coupled mode model (COM), and finite element method (FEM). Among them, the equivalent circuit model simplifies the actual physics greatly, resulting in low accuracy, and the finite element method cannot be used because of slow calculation. In the fast iterative design of SAW devices, the coupled mode model is more balanced than the other two methods in terms of both calculation accuracy and speed, so it is more widely used in design iterations.

According to different frequency bands and specification requirements, SAW device design often needs to take into account multiple design modes. In the case of relatively strict specification requirements, SAW devices need to be composed of insertion finger transducers (IDT), dual-mode surface acoustic wave structures (DMS), capacitors and inductors and other matching components to form a circuit with a relatively complex structure. Among them, the complex and changeable design of DMS is particularly prominent, and it may contain IDT combinations of different orders. In order to take into account the above-mentioned simulation requirements at all levels, EDA (Electronic Design Automation, Electronic Design Automation) software is required to simultaneously support resonator-level simulation, including IDT, each order DMS, etc., and filter-level simulation, including circuit structure, Matching components, electromagnetic influence, etc.

In the prior art, IDT, various stages of DMS, circuit simulation, simulation with matching components and electromagnetic influence are often independent software modules, and even for DMS simulation, there will be independent second-order DMS and third-order DMS , fifth-order DMS and other modules. Existing simulation methods lack versatility, cannot be expanded, and are difficult to systematically integrate into a complete simulation solution.

Contents of the invention

Embodiments of the present invention provide a method, system and related equipment for SAW physical simulation, aiming to solve the problems that traditional simulation solutions lack versatility, cannot be expanded, and are difficult to systematically integrate.

In a first aspect, an embodiment of the present invention provides a method for SAW physical simulation, the method comprising the following steps:

Determine the basic parameters of the finger strip, the basic parameters include geometric parameters, material parameters, adjustment parameters, intermediate variables;

Construct different simulation finger objects according to the preset spatial positions according to the basic parameters, and the simulation finger objects include electrode objects, reflective grid objects, and spacer objects;

Connecting different simulated finger objects according to preset electrical rules to obtain multiple simulated resonator objects, and calculating the electrical response parameters of each simulated resonator object;

Connect different simulated resonator objects with circuit matching element objects according to preset electrical rules to obtain a simulated filter unit, and calculate the simulated filter according to the electrical response parameters corresponding to the simulated resonator objects used for connection The overall electrical response parameters of the device unit;

The simulated filter unit is coupled with the scattering matrix of the RF front-end object according to preset electrical rules to obtain a physical simulation result of the simulated RF front-end module composed of the simulated filter unit.

Furthermore, the preset spatial position is a spatial position at which the basic parameters constituting the finger object are determined according to the physical characteristics of the electrode object, the reflective grid object, and the spacer object.

Furthermore, the preset electrical rules are based on the interconnected simulation finger objects, or the interconnected simulated resonator objects and the circuit matching element objects, or the interconnected simulated filter unit and The physical characteristics of the simulated RF front-end object determine its circuit connection mode that constitutes the simulated resonator object, the simulated filter unit, and the simulated RF front-end module.

Furthermore, the simulated resonator object includes an IDT object and a DMS object.

Furthermore, the circuit matching element objects include capacitance objects, inductance objects, and circuit simulation objects embodying physical characteristics of circuit elements.

Furthermore, the radio frequency front-end object includes a switch object, an amplifier object, and a low-noise amplifier object.

In the second aspect, the embodiment of the present invention also provides a SAW physical simulation system, including:

The basic parameter setting module is used to determine the basic parameters of the finger bar, and the basic parameters include geometric parameters, material parameters, adjustment parameters, and intermediate variables;

The finger setting module is used to construct different simulation finger objects according to the preset spatial positions according to the basic parameters, and the simulation finger objects include electrode objects, reflective grid objects, and spacer objects;

The resonator setting module is used to connect different simulated finger objects according to preset electrical rules to obtain multiple simulated resonator objects, and calculate the electrical response parameters of each simulated resonator object;

The filter setting module is used to connect different simulated resonator objects with circuit matching element objects according to preset electrical rules to obtain a simulated filter unit, and according to the connected simulated resonator objects corresponding to the The electrical response parameter calculates the overall electrical response parameter of the simulation filter unit;

The module simulation module is used to couple the simulation filter unit with the scattering matrix of the RF front-end object according to preset electrical rules, and obtain the physical simulation result of the simulation RF front-end module composed of the simulation filter unit.

In a third aspect, an embodiment of the present invention also provides a computer device, including: a memory, a processor, and a computer program stored on the memory and operable on the processor, and the processor executes the computer program When implementing the steps in the method for SAW physical simulation described in any one of the above-mentioned embodiments.

In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program as described in any one of the above-mentioned embodiments can be implemented. Steps in the method for SAW physical simulation described above.

The beneficial effect achieved by the present invention is that the construction of each level of the simulation object is realized by means of simulation programming, and the basic unit of the filter is formed, and each basic resonator unit is independently constructed by inheriting and nesting, and combined into the filter level When , the connection relationship between the resonator units can be arbitrarily specified, so it can give more freedom to the simulation calculation, which is conducive to flexible filter design and rapid iteration of scale. At the same time, it is compatible with IDT in the same simulation framework. Acoustic-electric coupling calculations with DMS, as well as electrical calculations for circuits and matching components, are compatible with DMS designs of various structures and orders, and realize the integration of SAW physical simulation solutions.

Description of drawings

Fig. 1 is a schematic flow chart of the steps of the SAW physical simulation method provided by the embodiment of the present invention;

Fig. 2 is a schematic diagram of an electrode object provided by an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a simulated resonator object provided by an embodiment of the present invention;

FIG. 4 is an illustration of the connection relationship of the simulation filter unit circuit provided by the embodiment of the present invention;

5 is a schematic diagram of a filter waveform of a simulated radio frequency front-end module provided by an embodiment of the present invention;

6 is a schematic structural diagram of a SAW physical simulation system provided by an embodiment of the present invention;

Fig. 7 is a schematic structural diagram of a computer device provided by an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Please refer to FIG. 1. FIG. 1 is a schematic flow chart of the steps of a method for SAW physical simulation provided by an embodiment of the present invention. The method includes the following steps:

S101. Determine basic parameters of a finger bar, where the basic parameters include geometric parameters, material parameters, adjustment parameters, and intermediate variables.

Specifically, step S101 is to describe the properties of a finger unit. The geometric parameters include a series of geometric dimensions such as the width of the finger, the length of the aperture, and the thickness of the electrode; the material parameters include parameters such as the wave velocity of the piezoelectric substrate and the piezoelectric coupling coefficient. ; Adjustment parameters are a series of adjustment physical quantities that exist in the coupled mode method to fit the actual physical phenomena; intermediate variables are some properties defined for the convenience of finger calculation.

Exemplarily, when the finger bar describes an electrode or a gap in a group of metal electrodes, the basic parameters include:

Geometric parameters: For an electrode, the strip width, metallization ratio, electrode height, and aperture length are required; for a gap, the gap width is required.

Material parameters: relative permittivity, reference wave velocity, parameters representing SAW penetration depth, parameters representing SAW reflection, electromechanical coupling coefficient of materials.

Adjustment parameters: loss coefficient, relative resistance due to capacitance at high frequency, adjustment coefficient of electromechanical coupling coefficient, adjustment coefficient of reflection coefficient.

Intermediate variables: such as the polarity of the electrode (connected or grounded), center frequency, amplitude of the wave, etc.

S102. Construct different simulation finger objects according to preset spatial positions according to the basic parameters, and the simulation finger objects include electrode objects, reflective grid objects, and spacer objects.

Furthermore, the preset spatial position is a spatial position at which the basic parameters constituting the finger object are determined according to the physical characteristics of the electrode object, the reflective grid object, and the spacer object.

The method of calculating the P matrix of the electrode object, the reflective grid object and the spacer object is also different due to the different positions of the fingers in the space, and the method of cascading the P matrix is different.

For example, please refer to Figure 2, Figure 2 is a schematic diagram of an electrode object provided by an embodiment of the present invention, Figure 2 is a whole composed of multiple single electrodes, each of which can have different electrode widths, different Aperture length, different electrode polarity, in the embodiment of the present invention, a plurality of single fingers will be integrated in a simulated finger object, and can calculate the whole all Describes the properties of the simulation finger object.

S103. Connect different simulated finger objects according to preset electrical rules to obtain multiple simulated resonator objects, and calculate an electrical response parameter of each simulated resonator object.

Furthermore, the preset electrical rules are based on the interconnected simulation finger objects, or the interconnected simulated resonator objects and the circuit matching element objects, or the interconnected simulated filter unit and The physical characteristics of the simulated RF front-end object determine its circuit connection mode that constitutes the simulated resonator object, the simulated filter unit, and the simulated RF front-end module.

Furthermore, the simulated resonator object includes an IDT object and a DMS object. Exemplarily, in the simulation finger objects obtained in step S102, the functions of how to perform cascading between different fingers can be stored in the respective finger objects, so when calculating different structures, you can use any method For cascading, please refer to FIG. 3. FIG. 3 shows the structure of the simulated resonator object obtained by cascading the simulated finger objects according to the embodiment of the present invention, which are respectively uniform in the propagation direction and the aperture direction. The uniform IDT resonator of , the third-order symmetric DMS with gradient in the propagation direction, and the fourth-order asymmetric DMS with a reflective grating inserted in the middle, and the gradient in the aperture direction.

S104. Connect different simulated resonator objects with circuit matching element objects according to preset electrical rules to obtain a simulated filter unit, and calculate the Simulate the overall electrical response parameters of the filter unit.

Furthermore, the circuit matching element objects include capacitance objects, inductance objects, and circuit simulation objects embodying physical characteristics of circuit elements.

Exemplarily, step S104 can calculate the overall electrical response parameters of the simulated filter unit of the simplexer, double SAW, duplexer, etc., please refer to Figure 4, Figure 4 is the simulated filter provided by the embodiment of the present invention The illustration of the connection relationship of the unit circuit, including three input and output ports in the shape of a triangle, multiple components such as capacitors, inductors, IDT, and DMS in the shape of a circle, and the connection nodes and grounding nodes between the components in the shape of a polygon.

S105. Coupling the simulated filter unit with the scattering matrix of the RF front-end object according to preset electrical rules to obtain a physical simulation result of the simulated RF front-end module composed of the simulated filter unit.

Furthermore, the radio frequency front-end object includes a switch object, an amplifier object, and a low-noise amplifier object.

For example, please refer to Fig. 5. Fig. 5 is a schematic diagram of the filter waveform of the simulated radio frequency front-end module provided by the embodiment of the present invention. It can be seen that the physical simulation result obtained by using the SAW physical simulation method in the embodiment of the present invention The required filter characteristics can be well simulated.

The beneficial effect achieved by the present invention is that the construction of each level of the simulation object is realized by means of simulation programming, and the basic unit of the filter is formed, and each basic resonator unit is independently constructed by inheriting and nesting, and combined into the filter level When , the connection relationship between the resonator units can be arbitrarily specified, so it can give more freedom to the simulation calculation, which is conducive to flexible filter design and rapid iteration of scale. At the same time, it is compatible with IDT in the same simulation framework. Acoustic-electric coupling calculations with DMS, as well as electrical calculations for circuits and matching components, are compatible with DMS designs of various structures and orders, and realize the integration of SAW physical simulation solutions.

The embodiment of the present invention also provides a SAW physical simulation system. Please refer to FIG. 6. FIG. 6 is a schematic structural diagram of the SAW physical simulation system provided by the embodiment of the present invention. The SAW physical simulation system 200 includes:

The basic parameter setting module 201 is used to determine the basic parameters of the finger bar, and the basic parameters include geometric parameters, material parameters, adjustment parameters, and intermediate variables;

The finger setting module 202 is used to construct different simulation finger objects according to the preset spatial positions according to the basic parameters, and the simulation finger objects include electrode objects, reflective grid objects, and spacer objects;

The resonator setting module 203 is used to connect different simulated finger objects according to preset electrical rules to obtain multiple simulated resonator objects, and calculate the electrical response parameters of each simulated resonator object;

The filter setting module 204 is used to connect different simulated resonator objects with circuit matching element objects according to preset electrical rules to obtain a simulated filter unit, and according to the connected simulated resonator objects corresponding to Calculate the overall electrical response parameters of the simulation filter unit by using the electrical response parameters;

The module simulation module 205 is used to couple the simulated filter unit with the scattering matrix of the RF front-end object according to preset electrical rules, and obtain the physical simulation result of the simulated RF front-end module composed of the simulated filter unit.

The SAW physics simulation system 200 can realize the steps in the SAW physics simulation method in the above-mentioned embodiment, and can realize the same technical effect, refer to the description in the above-mentioned embodiment, and will not repeat them here.

The embodiment of the present invention also provides a computer device. Please refer to FIG. 7, which is a schematic structural diagram of the computer device provided by the embodiment of the present invention. The computer device 300 includes: a memory 302, a processor 301 and 302 and a computer program that can run on the processor 301.

The processor 301 invokes the computer program stored in the memory 302 to execute the steps in the method for SAW physical simulation provided by the embodiment of the present invention, please refer to FIG. 1 , specifically include:

S101. Determine the basic parameters of the finger bar, the basic parameters include geometric parameters, material parameters, adjustment parameters, and intermediate variables;

S102. Construct different simulation finger objects according to the preset spatial positions according to the basic parameters, and the simulation finger objects include electrode objects, reflective grid objects, and spacer objects;

S103. Connect different simulated finger objects according to preset electrical rules to obtain multiple simulated resonator objects, and calculate the electrical response parameters of each simulated resonator object;

S104. Connect different simulated resonator objects with circuit matching element objects according to preset electrical rules to obtain a simulated filter unit, and calculate the Simulate the overall electrical response parameters of the filter unit;

S105. Coupling the simulated filter unit with the scattering matrix of the RF front-end object according to preset electrical rules to obtain a physical simulation result of the simulated RF front-end module composed of the simulated filter unit.

Furthermore, the preset spatial position is a spatial position at which the basic parameters constituting the finger object are determined according to the physical characteristics of the electrode object, the reflective grid object, and the spacer object.

Furthermore, the preset electrical rules are based on the interconnected simulation finger objects, or the interconnected simulated resonator objects and the circuit matching element objects, or the interconnected simulated filter unit and The physical characteristics of the simulated RF front-end object determine its circuit connection mode that constitutes the simulated resonator object, the simulated filter unit, and the simulated RF front-end module.

Furthermore, the simulated resonator object includes an IDT object and a DMS object.

Furthermore, the circuit matching element objects include capacitance objects, inductance objects, and circuit simulation objects embodying physical characteristics of circuit elements.

Furthermore, the radio frequency front-end object includes a switch object, an amplifier object, and a low-noise amplifier object.

The computer device 300 provided in the embodiment of the present invention can realize the steps in the method for SAW physical simulation in the above embodiment, and can achieve the same technical effect. Please refer to the description in the above embodiment, and details will not be repeated here.

The embodiment of the present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, each of the methods in the SAW physical simulation method provided by the embodiment of the present invention is implemented. process and steps, and can achieve the same technical effect, in order to avoid repetition, it will not be repeated here.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented through computer programs to instruct related hardware, and the programs can be stored in a computer-readable storage medium. During execution, it may include the processes of the embodiments of the above-mentioned methods. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM) or a random access memory (Random Access Memory, RAM for short).

It should be noted that, in this document, the term "comprising", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on such an understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products are stored in a storage medium (such as ROM/RAM, disk, CD) contains several instructions to make a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) execute the methods described in various embodiments of the present invention.

The embodiments of the present invention have been described above in conjunction with the accompanying drawings, and what is disclosed is only a preferred embodiment of the present invention, but the present invention is not limited to the above-mentioned specific implementation methods, which are only illustrative. Rather than limiting, under the inspiration of the present invention, those skilled in the art can also make many forms with equivalent changes without departing from the spirit of the present invention and the scope of protection of the claims, all of which belong to the scope of the present invention. within protection.

Claims (9)

1. A method of SAW physics simulation, the method comprising the steps of:

determining basic parameters of the finger, wherein the basic parameters comprise geometric parameters, material parameters, adjustment parameters and intermediate variables;

constructing different simulation finger strip objects according to the basic parameters and preset space positions, wherein the simulation finger strip objects comprise electrode objects, reflecting grating objects and interval objects;

connecting different simulation finger bar objects according to a preset electrical rule to obtain a plurality of simulation resonator objects, and calculating an electrical response parameter of each simulation resonator object;

connecting different simulation resonator objects with a circuit matching element object according to a preset electrical rule to obtain a simulation filter unit, and calculating the overall electrical response parameters of the simulation filter unit according to the electrical response parameters corresponding to the simulation resonator objects used in connection;

coupling the simulation filter unit with a scattering matrix of the radio frequency front end object according to a preset electrical rule to obtain a physical simulation result of a simulation radio frequency front end module formed by the simulation filter unit.

2. The SAW physical simulation method of claim 1 wherein the predetermined spatial location is a spatial location at which the basic parameters constituting the finger object are determined based on physical characteristics of the electrode object, the reflecting grating object, and the spacer object.

3. The SAW physical simulation method of claim 1, wherein the preset electrical rule is a circuit connection mode for determining the simulated resonator object, the simulated filter element, and the simulated rf front end module according to physical characteristics of the simulated finger object, the simulated resonator object, and the circuit matching element object, or the simulated filter element and the rf front end object.

4. The method of SAW physical simulation of claim 1, wherein the simulated resonator object comprises an IDT object and a DMS object.

5. The method of SAW physics simulation of claim 1, wherein the circuit matching element objects comprise capacitive objects, inductive objects, and circuit simulation objects embodying physical characteristics of circuit elements.

6. The method of SAW physics simulation of claim 1, wherein the radio frequency front end object comprises a switch object, an amplifier object, a low noise amplifier object.

7. A SAW physical simulation system, comprising:

the basic parameter setting module is used for determining basic parameters of the finger strip, wherein the basic parameters comprise geometric parameters, material parameters, adjustment parameters and intermediate variables;

the finger setting module is used for constructing different simulation finger objects according to the basic parameters and preset space positions, wherein the simulation finger objects comprise electrode objects, reflecting grating objects and interval objects;

the resonator setting module is used for connecting different simulation finger bar objects according to a preset electrical rule to obtain a plurality of simulation resonator objects, and calculating the electrical response parameter of each simulation resonator object;

the filter setting module is used for connecting different simulation resonator objects with the circuit matching element object according to a preset electrical rule to obtain a simulation filter unit, and calculating the overall electrical response parameters of the simulation filter unit according to the electrical response parameters corresponding to the simulation resonator objects used for connection;

and the module simulation module is used for coupling the simulation filter unit with the scattering matrix of the radio frequency front end object according to a preset electrical rule to obtain a physical simulation result of the simulation radio frequency front end module formed by the simulation filter unit.

8. A computer device, comprising: memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps in the method of SAW physics simulation as claimed in any one of claims 1 to 6 when the computer program is executed.

9. A computer readable storage medium, having stored thereon a computer program which when executed by a processor performs the steps in the SAW physical simulation method of any one of claims 1 to 6.

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