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Signal isolator

Electrical signal isolators are used in a wide variety of electrical systems, to enable signal levels to be translated from one part of a system to another without permitting the flow of direct current therebetween. Signal isolators can be used, for example, to couple signals that have relatively large offsets in DC voltage levels, to prevent ground loops for reducing system noise, etc. Signal isolators are typically used to isolate lower voltage circuits from relatively higher voltage circuits. For example, it is frequently desirable to isolate a group of sensors being operated in a relatively higher voltage range from processing being operated in a lower voltage range. Isolators are used in diverse applications such as industrial process control systems, making medical measurements of the human body, and so on. Many electronic applications require some form of signal isolation. Some of these applications include, for example, industrial control applications, down-hole petroleum and geothermal applications, certain medical applications, and numerous other applications. In a variety of environments, such as in process control systems, analog or digital signals must be transmitted between diverse sources and circuitry using those signals, while maintaining electrical isolation between the sources and the using circuitry.

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