![]() iCoupler technology leverages thick-film processing techniques to build microscale on-chip transformers and achieves thousands of volts of isolation on a chip. The first product, the ADuM1100 single-channel digital isolator, is in volume production. Recently iCoupler ®, a new isolation technology based on chip scale transformers, was developed by Analog Devices. All these isolators are restricted, moreover, because of integrated circuit integration limitations and the fact that they often need hybrid packaging. The capacitively coupled isolators have limitations in their size and ability to reject common-mode voltage transients, while the traditional transformer assembly based isolators are bulky and expensive. The intrinsic low conversion efficiencies for electrical light conversion and slow response photo detectors lead to optocoupler limitations in terms of lifetime, speed, and power assumption. Optocouplers rely on light emitting diodes to convert the electrical signals to light signals and on photo detectors to convert the light signals back to electrical signals. There are three commonly known classes of isolation devices: optocouplers, capacitively coupled isolators, and transformer based isolators. To maintain safety voltage at the user interface and to prevent transients from being transmitted from the sources, galvanic isolation is required. The controller then needs to transmit commands as a result of the analysis performed, coupled with user inputs to various actuators, to achieve certain operations. In many industrial applications, such as process control systems or data acquisition and control systems, digital signals must be transmitted from various sensors to a central controller for processing and analysis. High Speed Digital Isolators Using Microscale On-Chip Transformers ![]()
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