This section provides an overview for isolation amplifiers as well as their applications and principles. Also, please take a look at the list of 12 isolation amplifier manufacturers and their company rankings. Here are the top-ranked isolation amplifier companies as of December, 2023: 1.Skyworks Solutions, Inc., 2.Wieland Electric Inc., 3.Broadcom.
An isolation amplifier is an amplifier that can transmit signals while providing electrical isolation between input and output signals.
Isolation amplifiers are incorporated into the input and output circuits of printed circuit boards, such as microcontroller control boards, to provide DC isolation from incoming signals and enable accurate measurements. For this reason, they are generally used in measuring instruments and medical equipment.
They also serve to ensure the safety of users. Features include prevention of electric shock, signal branching, countermeasures against high ground potentials, and noise suppression.
Isolation amplifiers protect power supplies by removing reverse currents caused by high ground potentials. They can also be installed in environments with many noise sources.
Specific applications are as follows:
By incorporating them into key locations in circuits, they function as safety measures to prevent users from receiving electric shocks in the event of equipment malfunctions.
An isolation amplifier is a type of amplifier that operates circuits while completely separating and isolating them so that the circuits are not affected by grounding or common power supply. The main signal transmission methods include optical, magnetic, and capacitive, of which the operation of the magnetic method is as follows.
The input signal to the Isolation Amplifier first enters a buffer amplifier1 on the input side. This amplifier has the characteristics of high input impedance and low output impedance. The output side of the Isolation Amplifier is a similar buffer amplifier 2.
There is an isolation circuit between the two buffer amplifiers, but the input side is completely isolated from the output side in terms of DC. The isolation circuit has a signal transformer, with switching elements connected to the primary and secondary coils, respectively. synchronous rectification is possible by repeating the two switching elements on and off simultaneously.
Synchronous rectification then transfers a voltage to the secondary equal to the signal voltage entering the primary. Therefore, even if the primary and secondary sides of a signal transformer are completely isolated, the signal can be taken out from the secondary side.
An isolation amplifier has the following features.
Isolation amplifier isolation transformers have a power transformer in addition to the signal transformer. On the primary side of the power transformer, a square wave from the oscillator is added, and the same square wave is generated on the secondary side.
The oscillator frequency is set to match the frequency response of the Isolation Amplifier: a square wave oscillator of about 50 kHz to 100 kHz. The voltage from the power transformer drives the switching elements on both the primary and secondary sides, respectively.
The primary and secondary sides of the power transformer are also isolated from each other DC-wise, and the power supplies for the primary and secondary buffer amplifiers are also supplied from the primary and secondary sides of the power transformer.
When an isolation amplifier signal transmission is optical, a photocoupler is used. This photocoupler is an optical IC used in Isolation Amplifier circuits when making an isolated circuit in which the input and output are completely floating above each other, or when detecting signals of different potentials.
*Including some distributors, etc.
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Incorporated in 1965, Analog Devices, Inc. designs, manufactures, tests, and markets integrated circuits (ICs), software, and subsystems that leverage analog, mixed-signal, and digital signal processing technologies. The company provides data converter products, power management and reference products for power conversion, driver monitoring, sequencing, and energy management applications in the automotive, communications, industrial, and high-end consumer markets. In addition, the company provides digital signal processing and system products for high-speed numeric calculations. It serves clients in the industrial, automotive, consumer, instrumentation, aerospace, and communications markets.
Founded in Irvine, CA in 1962, Skyworks Solutions, Inc. designs, develops, manufactures, and markets proprietary semiconductor products. Its product portfolio includes amplifiers, antenna tuners, attenuators, automotive tuners and digital radios, clocks and timings, circulators/isolators, DC/DC converters, demodulators, detectors, diodes, wireless analog system on chip products, directional couplers, diversity receive modules, filters, front-end modules, hybrids, LED drivers, low noise amplifiers, mixers, modulators, switches, synthesizers, timing devices, technical ceramics, voltage controlled oscillators/synthesizers, and voltage regulators. The company provides its products for the usage in aerospace, automotive, broadband, cellular infrastructure, connected home, entertainment and gaming, industrial, medical, military, smartphone, tablet, and wearable markets.
Broadcom Inc., established in 1961, and headquartered in San Jose, California, is a manufacturer and supplier of semiconductor and connectivity solutions. The company specializes in producing products, such as semiconductors, infrastructure software, networking products, storage products, wireless products in which their products cater to industries such as telecommunications, data centers, and consumer electronics. Their products are used for various applications, including wireless communication, networking equipment, data storage, and multimedia devices, providing components for advanced technologies in numerous industrial and commercial sectors.
Nisshinbo Micro Devices Inc., established in 1959, and headquartered in Tokyo, Japan, is a manufacturer of semiconductors and electronic components. The company specializes in producing integrated circuits, discrete semiconductors, optoelectronic devices, which caters to industries such as telecommunications, automotive, and consumer electronics. The company holds ISO 9001 and IATF 16949 certifications, ensuring quality in their products which are used for various applications, including wireless communication, automotive systems, and industrial automation, providing crucial electronic components for advanced technologies in various industrial and commercial sectors.
NF Corporation was founded in 1959 and is headquartered in Yokohama, Japan. The company serves automobile, clean energy technologies, aerospace, and digital appliance industries. The ISO 9001 and ISO 14001 certified company combines a vertically integrated approach of development, engineering, manufacturing, sales, and field services. The company’s product segments include function modules, electric measurement instruments, and power supply and control products. The company also builds customized products for customers including EMC testing systems, lithium-ion battery charging and discharge testing systems, and bipolar power amplifiers.
Wieland Electric is headquartered in Hamberg Germany and was founded in 1910. Weiland Electric is a manufacturer of electrical connection and industrial automation products used in conveying, logistics, horticulture, lighting, machine building & safety, and energy industries. Wieland Electric’s product categories include active industrial products, passive industrial products, modular wiring systems, power distribution for electric vehicles, integrated lighting & building solutions, and indoor interconnect products such as metal fabrication, 3D printing for prototyping, electrical design, and box build fabrication.
Morson America LLC, founded in 1998 with headquarters in the USA, is a manufacturer of industrial power supply solutions. The company's product line includes AC-DC converters, DC-DC converters, transceiver modules, isolation amplifiers, and power supply controllers. Morson America LLC's products are used in the industrial, medical, telecommunications, and engineering fields. Morson America’s products can be found in EV batteries, photovoltaic systems, and smart home appliances. The company holds ISO 9001:2000, ISO 4001, and OHSMS 18001 certifications.
Watanabe Electric Industry Co. Ltd. are manufacturers of measurement and control instruments since 1940 in Japan. The company deals in signal converters, digital panel meters, non-contact meter relays, and electric current recorders. The signal converters are used to isolate and convert signals to prevent current ground loops, protect from external noise, signal boosting, and more. Digital panel meters also have various applications such as filter clogging monitors, weight measurement, conveyor rotation speed management, and many other uses. The equipment is known for its accuracy and stability while being in use.
Toshiba Electronic Devices & Storage Corporation is a division of Toshiba focusing on providing designs for end-product developers as well as semiconductor and drive equipment for automotive, industrial equipment, green energy, and consumer and personal electronic devices. Toshiba’s storage products include cloud-scale and enterprise-level products, and PC hard drives. Semiconductor products include Si Cower devices, MOSFETs, IGBTs, IEGTs, isolators, solid state relays, power management and intelligent power ICs, diodes, bipolar transistors, microcontrollers, automotive devices, ICs for wireless communication equipment, general purpose logic ICs, radio-frequency devices, sensors, and linear image sensors.
Texas Instruments Incorporated was founded in 1930 and is headquartered in Dallas, Texas. Texas Instruments is a producer of high tech equipment for industrial, automotive, personal electronics, communications equipment industries. Texas Instruments designs, manufactures, and sells semiconductors to electronics designers and manufacturers in the United States and internationally. Texas Instruments operates in two segments: analog and embedded processing. The Analog segment offers power products, including battery-management solutions, DC/DC switching regulators, power switches, linear regulators, voltage references, and lighting products. The Embedded Processing segment offers microcontrollers that are used in fields such as electronic equipment and digital signal processors for mathematical computations.
RS Components Ltd. is a distributor of electrical components, founded in 1937 and located in Corby, Northamptonshire. Their product range includes, but is not limited to, electronic connectors, cables, wires, as well as enclosures, relays, and switches. The company serves multiple industries, including Food & Beverage, Marine, Electronics, Automotive, and more. Worldwide delivery requirements are accommodated with support for multiple freight options, and the company also specializes in hazardous packaging compliant with IATA standards.