Wave Technology List of Products and Services

★★Shirutoku Report: Useful Information You Should Know★★ This report introduces distributed constant circuits. We will explain distributed constant circuits, where the distances and dimensions of wiring and components are finite, and the signal transmission time is also finite, as well as concentrated constant circuits, which are the opposite concept where the distance of wiring is zero, using diagrams. Please take a moment to read it. 【Contents】 ■ Concentrated Constant Circuits ■ Distributed Constant 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 Can Benefit From★★ This report introduces illumination control using Arduino. For those who want to "add or change their favorite lighting patterns," we present examples of DIY projects using microcontrollers and modules with simple and convenient features. Please take a moment to read it. 【Contents】 ■ Equipment Used ■ Procedure *For more details, please refer to the PDF document or feel free to contact us.*

• System lighting and lighting control

★★Shirutoku Report: Useful Information You Can Benefit From★★ This report is a continuation of the discussion on controlling illumination with Arduino from Shirutoku Report No. 58, and this time we have incorporated screen display and button operation. We will explain the LCD display method and button operation method with actual photos. Our company undertakes the development of various embedded devices and IoT devices using a variety of microcontrollers. If you have any inquiries, please feel free to contact us. [Contents] ■ LCD Display Method ■ Button Operation Method *For more details, please refer to the PDF document or feel free to contact us.

• System lighting and lighting control

★★Shirutoku Report: Useful Information You Should Know★★ This report introduces the electrical evaluation related to switching power supplies. The evaluation of power circuits features a lot of content that confirms whether they can operate safely (i.e., whether there are any hazards). There are also specific aspects that may be unfamiliar to those not involved in power supply design or evaluation, so I would like to take this opportunity to explain them. 【Contents】 ■Electrical Characteristics Evaluation ■Component Rating Confirmation ■Abnormal Testing ■Temperature Rise Testing ■Immunity Testing ■Reliability Testing *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 report introduces the requirements for insulation and measures against noise. In electrical circuits, insulation may be used to avoid safety issues such as electric shock and to prevent unexpected current destruction. Common items we handle include communication interfaces like LAN and insulated power supplies. It is common to use optocouplers or transformers for the transmission of signals and power across insulated sections. If you are having trouble with noise measures, please feel free to contact us. 【Contents】 ■ Insulation and Noise Measures *For more details, please refer to the PDF document or feel free to contact us.*

• Parts and Materials

★★Shirutoku Report: Useful Information You Should Know★★ This report introduces the ideals and realities of circuit diagrams. Circuit diagrams include electronic components such as capacitors, inductors, transistors, diodes, and resistors, which are treated as ideal elements. However, in real circuits, there are not only these elements but also parasitic components such as capacitive, inductive, and resistive elements, which can cause various adverse effects and hinder the intended operation of the designer. Our company has many engineers who are well-versed in parasitic components and can perform circuit design, so if you are interested, please feel free to contact us. [Contents] ■ Parasitic Capacitance ■ Parasitic Inductance ■ Parasitic Resistance *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 report, we will introduce an important invisible element, "impedance," in addition to parasitic components that are not visible on circuit diagrams. Impedance refers to AC resistance and is often specified as 50Ω for single-ended and 100Ω for differential. In high-frequency circuit design, impedance becomes a critical issue. Even parasitic impedance that is not shown in the circuit diagram can be discerned by professionals. If you are interested, please feel free to contact us. 【Contents】 ■ An example of a circuit diagram created with LT-spice *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★★ This report introduces the switching evaluation of power semiconductors such as power devices and power modules. The ideal switching operation is a state where there is no delay time in current and voltage when turning ON/OFF, meaning that there is no occurrence of power loss. However, during the switching operation of power devices, some delay time inevitably occurs. Our company has engineers with expertise in switching evaluation, so if you require evaluation of various power devices, please feel free to consult us. 【Contents】 ■ IGBT Module Measurement Circuit Examples ■ IGBT Module Measurement Environment Examples *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 report introduces methods for quantitatively confirming the magnitude of circuit inductance. When improving the measurement environment for evaluating power semiconductor switching, it is sometimes necessary to reconsider the wiring. However, without a quantitative understanding of the circuit inductance in the measurement system, improvements can be difficult. By using measured circuit inductance values during simulations, results closer to actual measured waveforms can be obtained. 【Contents】 ■ Methods for improving circuit inductance ■ IGBT module measurement circuit examples ■ Methods for confirming circuit inductance *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 report introduces measures for dealing with equipment failures related to PC98. A customer consulted us about a printer connected to a PC98 used for controlling test equipment that had broken down, resulting in an inability to print data. They were wondering if there was any way to resolve this issue. Our company also responds to measures for dealing with failures and extending the life of aging tools, devices, and equipment surrounding production facilities, so please feel free to consult us if you have any concerns. 【Contents】 ■ Customer Consultation ■ Specific Measures ■ Construction of the Measures System *For more details, please refer to the PDF document or feel free to contact us.*

• Desktop PC
• Other PCs and OA equipment

★★Shirutoku Report: Useful Information You Should Know★★ This report introduces the features of ballast power control. The ballast power supply refers to a device that stabilizes the discharge state of lamps, which are light sources such as car headlights and LCD projectors. Unlike general power supplies that control with constant voltage or constant current, to keep the lamp lit stably, it is necessary to understand the lighting characteristics of each type of lamp and control the power output according to the lamp's state. 【Contents Included】 ■ Example of lighting characteristics of ultra-high pressure mercury lamps used in LCD projectors ■ Fast control is required ■ Emits light at the necessary brightness ■ Control of the switching operation itself *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 Power Supply Design Department designs various types of switching power supplies, such as AC-DC converters and DC-AC inverters, and conducts various evaluations and tests specific to power supplies. Among these tests, there are rigorous evaluations known as "abnormal tests," which assess safety during component failures. One of the important devices that protects the evaluation equipment during such harsh tests is the "circuit breaker." Many may be more familiar with the term "breaker." This report will introduce you to these breakers. 【Contents】 ■ Ampere Breaker: Maintains the current value contracted with the power company ■ Leakage Breaker: Protects commercial systems held by households and power companies from accidents ■ Safety Breaker: Maintains the current value for each circuit (each room) *For more details, please refer to the PDF document or feel free to contact us.

• Power distribution and control panels

★★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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★★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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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.

• Parts and Materials
• Other services and technologies

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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★★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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★★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 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 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 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★★ 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★★ 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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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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• Other services and technologies

★★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

★★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★★ 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 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★★ 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★★ 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 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★★ 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 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, 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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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 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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★★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★★ 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 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 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 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 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★★ 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 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, 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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