Wave Technology List of Products and Services

Contract evaluation involving the design and development of evaluation environments Evaluation and reliability testing linked with environmental test chambers Reliability-related evaluation of automotive electronic components, including power devices Proposal for evaluation linked with reverse engineering

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It continuously monitors multiple channels in any temperature and humidity environment. It is capable of measuring small currents under high voltage application (up to 1000V). It supports temperatures from -40 to 150°C and humidity levels from 30 to 95% RH. This includes leakage measurements of capacitor components, semiconductor products, and insulating materials.

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★★Shirutoku Report: Useful Information You Should Know★★ When using a fan or blower to circulate air within a space, you may have specific goals such as wanting to direct airflow to a particular area or to circulate air throughout the entire space. However, if the placement of the fan is done solely based on intuition, it may not achieve those objectives. Therefore, this time we will introduce the importance of considering not only the outlet side of the fan but also the inlet side when using fans or blowers to circulate or ventilate air inside a room or electronic devices. [Contents] ■ Considering fan placement based on airflow ■ How to prevent short circuits ■ Consideration for the inlet side of fans and blowers *For more details, please refer to the PDF document or feel free to contact us.

• Ventilation system

★★Shirutoku Report: Useful Information You Should Know★★ At WTI, we offer thermal design services, proposing predictions for component temperatures and heat dissipation measures. Among these measures, ventilation is one of the effective strategies. In today's life, the importance of ventilating offices and rooms is increasing, but the fundamental concept of ventilating electronic devices and rooms is the same. Therefore, this time we will introduce methods to ensure the entry and exit of air when ventilating. [Contents] ■ Ventilation by opening windows ■ Ventilation using fans ■ Ventilation in thermal design *For more details, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Should Know★★ At WTI, we conduct design and development tailored to our customers' requests, and this time we will discuss principle verification. Here, principle verification refers to the process of confirming basic operations and characteristics before starting full-scale product design. When there is a request for new development and it is believed that there may be technical challenges, we may suggest starting with principle verification. [Contents] ■ About Principle Verification ■ Confirmation of whether the MOSFET for preventing inrush current functions as intended *For more details, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Should Know★★ Recently, with the spread of mobile devices, there has been remarkable progress in the miniaturization and increased capacity of ceramic capacitors. However, it is essential to thoroughly understand their characteristics when using ceramic capacitors. In particular, those with high dielectric constants can have significant variations in capacitance due to temperature and applied voltage, so caution is necessary. This time, we will focus on the often-overlooked factor of "shock" and introduce points to consider when using ceramic capacitors. [Contents] ■ Points to Consider When Using Ceramic Capacitors *For more details, please refer to the PDF document or feel free to contact us.*

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★★Shirutoku Report: Useful Information You Should Know★★ Our company offers custom measurement services, proposing the construction of testing environments tailored to our customers' needs. We cater not only to general evaluations such as semiconductors but also to a wide range of special measurements, including high-sensitivity measurements, large currents, and high voltages. This time, we would like to introduce a transistor sorting inspection system that was developed in response to such requests. It is especially recommended for customers who are struggling with the need for custom evaluations but cannot make capital investments. [Contents] ■ Transistor Sorting Inspection System *For more details, please refer to the PDF document or feel free to contact us.

• Measurement and Inspection

★★Shirutoku Report: Useful Information You Should Know★★ CAN FD (CAN with Flexible Data Rate) is a communication protocol that extends the specifications of the CAN (Classic CAN: Controller Area Network) protocol, enabling higher communication speeds and larger data transmission compared to traditional CAN. This document explains the actual implementation of CAN FD communication using Infineon’s AURIX microcontroller and an evaluation board (TriBoard). Please take a moment to read it. 【Contents】 ■ Structure of the communicating bits ■ CAN FD communication ■ Secondary sample points ■ Surprisingly easy to communicate *For more details, please refer to the PDF document or feel free to contact us.*

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★★Shirutoku Report: Useful Information You Can Benefit From★★ When observing signal waveforms, many of you likely use an oscilloscope. Today, I will discuss whether the waveforms you see on that oscilloscope are truly accurate. Please take a moment to read this. 【Contents】 ■ About the oscilloscope itself ■ General passive probes ■ How to connect the oscilloscope's GND *For more details, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Can Benefit From★★ In the previous installment, we created the base PWM signal, so this time we will add the necessary dead time for actual operation and try driving the inverter circuit with the generated signal. We have provided clear explanations using diagrams and graphs, so please take a moment to read through it. 【Contents】 ■ (2) Adding Dead Time ■ (3) Using It in the Inverter Circuit *For more details, please refer to the PDF document or feel free to contact us.*

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★★Shirutoku Report: Useful Information You Can Benefit From★★ Spice simulation typically uses models provided by manufacturers or models extracted from actual measurements. However, as the scale becomes too large, issues such as slow analysis speed or errors that prevent operation can occur. This can lead to situations where you only want to check trends, but end up spending more time than expected investigating the manufacturer models because they won't run. This time, I will discuss the "behavior model," which can be used when you want to grasp trends simply in circuit simulation. 【Contents】 ■ (1) Creating PWM signals ■ (1-1) Creating the modulated signal ■ (1-2) Creating the carrier signal ■ (1-3) Creating the original PWM signal *For more details, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Should Know★★ SiC MOSFETs have the characteristic of high voltage resistance compared to Si, while also having low resistance. Leveraging this feature, many products are seen replacing high-voltage IGBTs with SiC MOSFETs. This time, I would like to talk about MOSFETs. If you want to know about SiC diodes, please refer to Shirutoku Report No. 12. 【Contents】 ■Comparison examples of Si-MOSFET, IGBT, and SiC-MOSFET ■Do not compare solely based on ON resistance ■When replacing with SiC, be mindful of changing the drive voltage *For more details, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Should Know★★ This time, I will talk about the voltage detection circuit, which plays an important role in the functions of power converters. The evaluation of power converters includes assessments related to the circuit, such as confirming the operation of circuit functions and checking component ratings. Please take a moment to read it. 【Contents】 ■ Voltage Detection Locations ■ About the Voltage Detection Circuit *For more details, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Should Know★★ This time, I would like to talk about "5G" and "high-frequency amplifiers," which are one of the communication standards. I will introduce "What is 5G," "Features of 5G," and "High-frequency amplifiers for 5G." Please take a moment to read it. 【Contents】 ■ What is 5G ■ Features of 5G ■ High-frequency amplifiers for 5G *For more details, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Should Know★★ This time, we will talk about weak radio waves. Weak radio waves are wireless signals that emit only extremely weak radio waves, so there are no restrictions on their use or transmission time, and there is no need to apply for or notify a license. However, the electric field strength (the strength of the radio waves) must be lower than the specified level. For more details, please take a look. 【Contents】 ■ What are weak radio waves? ■ Wireless equipment testing *For more information, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Can Benefit From★★ The current task is the evaluation of "power conditioners" (hereinafter referred to as power conditioners). Although there are various evaluations when it comes to "power conditioner evaluation," this time I would like to discuss the noise countermeasures implemented in our recent work. Please take a moment to read it. [Contents] ■ Causes of Noise Generation ■ Noise Countermeasure Component "Core (Core Material of the Coil)" *For more details, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Should Know★★ One of the important components that affects the reception characteristics of wireless devices is the LNA (Low Noise Amplifier). We often receive requests from customers asking, "What criteria should we use to select this component?" Therefore, this time, we will discuss the selection criteria for LNAs. Please take a moment to read it. 【Contents】 ■(1) Selection of devices considering power-saving requirements ■(2) Selection focusing on NF and P1dB ■(3) Selection focusing on Gain and IP3 *For more details, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Should Know★★ The Structural Design Department is broadly divided into simulation (thermal, stress) and mechanism design, and I am in charge of thermal simulation. I started with almost no knowledge of heat. Through daily learning, the simulation that visualizes the invisible "heat" is an important tool for solving and preventing various thermal issues, and I am currently learning its fundamentals. There are two major challenges in thermal simulation. Let me explain the reasons. [Contents] ■ Two Challenges in Thermal Simulation ■ Temperature Distribution Map Around the Heat Source (Simulation Results) *For more details, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Can Benefit From★★ This time, I would like to convey that timing verification is extremely important in FPGA design. We have included images of long wiring between flip-flops. Please take a moment to read it. 【Contents】 ■Timing verification is extremely important in FPGA design ■Images of long wiring between flip-flops *For more details, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Can Benefit From★★ Recently, we received inquiries about the differences between "LTE-M" and "NB-IoT," which are communication standards for IoT devices using LPWA (Low Power Wide Area) technology. We will discuss "Why is the performance not as stated in the data sheet?" and "How to ensure performance according to design values/data sheets." Please take a moment to read it. [Contents] ■ Why is the performance not as stated in the data sheet? ■ How to ensure performance according to design values/data sheets ■ Antenna simulation analysis service (If you have antenna-related issues...) ■ Finally *For more details, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Should Know★★ This time, I would like to discuss the basics of "insulation" in power supply design. In power supply design, insulation is primarily used to ensure the safety of equipment and to prevent malfunction due to noise, making it an important factor related to the safety and reliability of devices that use power supplies. Please take a moment to read it. [Contents] ■ Types of Insulation ■ Explanation ■ Examples of Application Areas *For more details, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Can Benefit From★★ This time, I would like to continue discussing the topic related to transfer functions that I briefly touched on last time. A transfer function, as mentioned in the title, is knowledge necessary for designing control circuits for power supplies. Phase compensation can also be considered a control circuit in the sense that it controls circuit oscillation. I have also included a brief overview of transfer functions. Please take a moment to read it. 【Contents】 ■ Overview of Transfer Functions ■ Transfer Functions with Phase Compensation Incorporated *For more details, please refer to the PDF document or feel free to contact us.

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Our company offers a one-stop service from replacement component research to renewal design, including prototyping and evaluation. We provide Plan A for alternative component research, Plan B for revision design support, and Plan C for FPGA implementation. Please feel free to contact us when you need assistance. 【Plans】 ■ Plan A: Alternative Component Research ■ Plan B: Revision Design Support ■ Plan C: FPGA Implementation *For more details, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Should Know★★ Recently, we received inquiries about the differences between "LTE-M" and "NB-IoT," which are communication standards for IoT devices using the LPWA (Low Power Wide Area) method. Both "LTE-M" and "NB-IoT" are IoT communication services that utilize mobile phone networks, and they operate in the same frequency band. Please take a moment to read this. 【Contents】 ■ LTE-M and NB-IoT ■ Both utilize mobile phone networks... ■ Differences in usage... *For more details, please refer to the PDF document or feel free to contact us.*

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★★Shirutoku Report: Useful Information You Should Know★★ This time, we will introduce a comparison of radiation efficiency by changing the ground area of a monopole chip antenna. We will cover topics such as the "Introduction," "Monopole Antenna," and "The Relationship Between Radiation Efficiency of Monopole Chip Antennas and Ground Area." Please take a moment to read it. [Contents] ■ Introduction (Frequency Bands of 4G, LTE-Advanced, and Multi-band Antennas) ■ Monopole Antenna (The ground is also part of the antenna) ■ The Relationship Between Radiation Efficiency of Monopole Chip Antennas and Ground Area *For more details, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Should Know★★ Recently, many customers want to obtain Technical Standards Conformity Certification (Giteki) to use or sell imported Wi-Fi products domestically. However, imported Wi-Fi products are not adjusted for the Japanese market, and in most cases, they cannot obtain Technical Standards Conformity Certification (Giteki) even if tested as is. Here are the reasons: - The transmission power is too high - The usable frequencies are different - They must comply with Japan-specific DFS patterns *For more details, please refer to the PDF document or feel free to contact us.*

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★★Shirutoku Report: Useful Information You Can Benefit From★★ Following Shirutoku No. 79, this is the second installment on improving communication distance. In the previous issue, we introduced how reviewing the installation height of antennas in relation to the Fresnel zone can extend communication distance. This time, we would like to consider measures against interference waves. 【Contents】 ■ Radio waves can sometimes become interference waves ■ Tips for countermeasures ■ High-frequency (RF) and wireless design contracting services *For more details, please refer to the PDF document or feel free to contact us.*

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★★Shirutoku Report: Useful Information You Should Know★★ In the case of 920MHz low-power wireless modules, which have relatively good communication distance and decent speed, the transmission output is limited to 20mW or less. A line-of-sight distance of about 5 km is possible. However, in practice, it is often the case that the range is only a few hundred meters. This document explains the factors that reduce communication distance. Please take a moment to read it. 【Contents】 ■ Factors that reduce communication distance ■ Football-shaped space ■ Significantly improving communication distance *For more details, please refer to the PDF document or feel free to contact us.*

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★★Shirutoku Report: Useful Information You Should Know★★ LED lighting is now used in various places, such as home lighting, streetlights, and display backlights. When using LEDs for lighting, it is often necessary to drive multiple units simultaneously to meet brightness specifications. In such cases, the question arises as to how to combine and connect them in series and parallel. Are you aware of the characteristics that differ based on the connection method? I would like to explain the advantages and disadvantages of LED series and parallel connections. [Contents] ■ Series Connection ■ Parallel Connection ■ Advantages and Disadvantages *For more details, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Should Know★★ We are engaged in the development of chargers for Li-ion batteries. In addition to the Li-ion battery, the charger is connected to an inverter as part of the entire system, so resistance to the noise voltage generated by these components is required. This time, we will discuss the resistance to noise voltage applied externally to the output terminals of this charger. [Contents] ■ It is also necessary to avoid resonance with noise ■ Confirm characteristics with an impedance analyzer ■ Consideration of impedances not shown in the circuit diagram is also necessary *For more details, please refer to the PDF materials or feel free to contact us.

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★★Shirutoku Report: Useful Information You Should Know★★ In digital circuits, there are synchronous circuits that are synchronized with a clock and asynchronous circuits that are not. The flip-flops (FF) used in synchronous circuits have timing specifications such as setup time (tSU) and hold time (tH) established as requirements for stable operation between the clock and input signals. This time, we will explain the handling of asynchronous input signals, which require caution in digital circuit design such as FPGA. [Contents] ■ Factors that cause logical circuits to malfunction ■ Measures to prevent impact on circuit operation ■ The number of flip-flops needs to be optimized ■ It is important to thoroughly implement metastability measures during the design phase *For more details, please refer to the PDF materials or feel free to contact us.*

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★★Shirutoku Report: Useful Information You Can Benefit From★★ I am engaged in power supply circuit design and encounter a wide variety of power supplies on a daily basis. There are various control methods for power supplies, but the two most commonly seen are: (1) Constant voltage power supplies that control to maintain a constant voltage value (2) Constant current power supplies that control to maintain a constant current value This time, I would like to talk about (2) constant current power supplies. [Contents] ■1. (Pseudo) Constant current driving of LEDs using constant voltage power supplies ■2. Constant current driving of LEDs *For more details, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Should Know★★ There is no need to reiterate the definition of "IoT," as it has already permeated our lives. In the market, there are many inexpensive gadgets available that allow for development simply by connecting to a PC, creating an environment where anyone can easily work on IoT devices as part of summer vacation projects. While IoT devices have become so easy to develop, what challenges arise when it comes to commercialization and productization? We will introduce the essential embedded technologies for IoT development. [Contents] (1) The performance of IoT devices that cannot be achieved by merely combining devices (2) The necessity of energy-saving, utility expansion, and power efficiency for large-scale applications of IoT devices (3) Other challenges that need to be addressed *For more details, please refer to the PDF document or feel free to contact us.

• IoT

This document summarizes the WTI blog of Wave Technology Co., Ltd., which is engaged in "development and design promotion business" to solve the shortage of engineers, from May 10, 2022, to May 31, 2022. It introduces topics such as "Web Scraping with Raspberry Pi - Preparation Edition" on May 10, 2022, and "Methods for Joining Sheet Metal Enclosures" on May 31, 2022. In addition, we have published a wealth of useful information related to products and industries. We encourage you to read it. 【Features】 ■ May 10, 2022: Web Scraping with Raspberry Pi - Preparation Edition ■ May 17, 2022: Introduction to Conduction Resistance Monitoring System ■ May 24, 2022: Challenge LIN Communication using Infineon’s Automotive Microcontroller Evaluation Board AURIX TC375 Lite Kit V2! (Part 2) ■ May 31, 2022: Methods for Joining Sheet Metal Enclosures *For more details, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Should Know★★ Have you ever seen the "Technical Standards Conformity Certification" mark? This mark is granted to products that have received certification known by the abbreviation "Giteki." This time, I would like to talk about the frequently asked questions regarding obtaining Giteki certification. Please take a moment to read it. [Contents] ■ What is Technical Standards Conformity Certification? (What is Giteki?) ■ What is the difference between Giteki and construction design certification? ■ How should I apply for Giteki? ■ What are the benefits of requesting a design company to apply for Giteki? *For more details, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Should Know★★ When it comes to indicators that represent the performance of high-frequency amplifiers, there are output power, gain, efficiency, and so on, and development is progressing to meet the required performance for each. However, aside from these performance metrics, there is an important issue to be aware of in high-frequency amplifier development: "not oscillating." This document explains that addressing oscillation is also crucial in high-frequency amplifier development. Please take a moment to read it. [Contents] ■ Methods to Suppress Gain *For more details, please refer to the PDF document or feel free to contact us.*

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★★Shirutoku Report: Useful Information You Should Know★★ In this document, I would like to discuss the design of high-frequency amplification circuits. High-frequency amplification circuits are composed of amplification elements, matching circuits, and bias circuits. I will explain in order: "Selection of amplification elements," "Design of matching circuits," and "Design of bias circuits." Please take a moment to read it. 【Contents】 ■ Selection of amplification elements ■ Design of matching circuits ■ Design of bias circuits *For more details, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Should Know★★ In this document, we would like to provide detailed information about "Technical Conformity Mark" (Giteki), which has been receiving an increasing number of inquiries. We will explain what is needed for the Giteki application using the Bluetooth (BLE) module application as an example. We also include the benefits of requesting a Giteki application from a design company, so please take a moment to read through it. 【Contents】 ■ What is needed for the Giteki application... ■ What are the benefits of requesting a Giteki application from a design company? *For more details, please refer to the PDF document or feel free to contact us.*

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★★Shirutoku Report: Useful Information You Can Benefit From★★ In this document, I would like to talk about audio design (high sound quality). Recently, we haven't been hearing the term Hi-Fi (high fidelity, high reproducibility) much anymore. Perhaps it's because Wi-Fi has become so common that it has become confusing, and people have stopped using it... Or is it because high-resolution audio has become the term for high sound quality instead of Hi-Fi? 【Contents】 ■ Definition of Good Sound ■ Design Points to Be Careful About *For more details, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Should Know★★ In the field of high frequency, the use of circuit simulation has become essential for circuit design. This document introduces the utilization of high frequency circuit simulators. We provide explanations using figures such as "Examples of Circuit Simulation Results for Matching Circuits," so please take a moment to read it. [Contents] ■ Examples of Circuit Simulation Results for Matching Circuits, etc. *For more details, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Should Know★★ Do you know about specific low-power radio? It is often referred to as "Tokushou" for short. In this document, we will introduce this topic. We cover "Applications of Specific Low-Power Radio (Tokushou)" as well as "Wireless Communication Circuit Design Services," so please take a moment to read through it. 【Contents】 ■ What is Specific Low-Power Radio (Tokushou)? ■ Various Standards for Specific Low-Power Radio (Tokushou) ■ Introduction to Wireless Communication Circuit Design Services *For more details, please refer to the PDF document or feel free to contact us.*

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I am engaged in the development and design of mobile communication devices. In this document, I will focus on the "modification" work within that context. "Modification" in the development and design field involves identifying issues from prototype evaluations and incorporating the countermeasures back into the prototype (essentially reworking it). There are points to be cautious about in terms of both the work process and the design aspects during "modification." Please take a moment to read through it. [Contents] ■ Points to note for soldering work ■ Design considerations to be aware of *For more details, please refer to the PDF document or feel free to contact us.

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This document summarizes the WTI blog of Wave Technology Co., Ltd., which is a "development and design promotion business" aimed at solving the shortage of engineers, from April 5, 2022, to April 26, 2022. It introduces topics such as "About the dimensional standards of semiconductor packages" from April 5, 2022, and "Is it true that current becomes a whirlpool?" from April 26, 2022. In addition, it includes a wealth of useful information related to products and industries. We encourage you to read it. [Contents] ■ April 5, 2022: "About the dimensional standards of semiconductor packages" ■ April 12, 2022: Inquiry case studies from substrate manufacturers (sequel) ~ Substrate design also requires adjustments that align with the manufacturing processes of substrate manufacturers ~ ■ April 19, 2022: An era where services are utilized for tasks other than those that the company should focus on ■ April 26, 2022: Is it true that current becomes a whirlpool? *For more details, please refer to the PDF document or feel free to contact us.

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★★Shirutoku Report: Useful Information You Can Benefit From★★ You may casually use linear regulators and DC-DC converters, but when you turn on the power, they provide the desired output voltage as if it were a matter of course. Have you ever wondered, "Why is that voltage output stable?" In this report, we will introduce the reference voltage sources found within power ICs such as linear regulators and DC-DC converters. Please take a moment to read it. 【Contents】 ■ Discussion on Reference Voltage Sources ■ An Example of a Bandgap Reference Circuit ■ Detailed Explanation *For more details, please refer to the PDF document or feel free to contact us.*

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★★Shirutoku Report: Useful Information You Can Benefit From★★ In this report, we will introduce the A/D converter related components mounted on the microcontroller of the control board, which is central to power control. The importance of noise countermeasures for the ADC used in the circuit is extremely high, as any deviation in conversion values due to noise can adversely affect subsequent control. We will discuss the issues related to ADC noise and their countermeasures, so please take a moment to read through it. 【Contents】 ■ (1) About ADCs mounted on microcontrollers ■ (2) Issues with input noise in ADCs ■ (3) Specific examples of noise countermeasures for ADCs *For more details, please refer to the PDF document or feel free to contact us.

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