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35 | low efficiency and are sensitive to humidity and temperature. Magnetic Isolation Magnetic isolation uses operating principles like those of a transformer, consisting of two coils and a core. The coils are both wound around the core but are electrically isolated from each other. When the primary coil is energized by a current, a magnetic flux is induced in the core, which then causes a voltage in the secondary core. Magnetic isolation can protect circuits from surges of over 1000V and offers a higher bandwidth than optical isolation. Magnetic isolation devices are very robust and can offer operational life for many years. Historically, one of their main drawbacks was that they could consume a lot of space. However, today's technology has shrunk them enough for a single package to isolate several channels. Sensing Electric motor solutions almost always integrate a feedback loop to provide the controller with information on the rotor's position, speed, and acceleration to deliver precise and efficient control. There are different ways of taking these measurements, and the best solution depends on each application's needs. For example, a CNC machine may need highly accurate measurements, while a vehicle window motor may require less precise data. Resolvers Resolvers provide one of the most accurate ways of measuring rotor position. They use transformer Figure 2: The resolver uses a primary winding and a pair of secondary windings in quadrature. It requires AC excitation and demodulation but is accurate, rugged, and provides absolute position information on power-up. (Source: Analog Devices, Inc.; redrawn by Mouser Electronics) MASTERGAN GaN Half-Bridge High Voltage Drivers mouser.com/stm-mastergan-system-in-package