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What does the isolation circuit method usually have?
In the medical equipment, industrial control, data acquisition with high accuracy, long distance communication, high and low voltage mixed system circuit design, they are often used isolation circuit. In general, the commonly used isolation mode has two kinds: light bauer coupling isolation and magnetic bauer coupling isolation.
Optically coupled isolation mode is suitable for the transmission of low frequency signals and DC signals, but with larger power consumption. Magnetic bauer coupling isolation methods are suitable for high frequency signal transmission, cannot be used for DC or low frequency signal transmission, and the need for isolation output signal shaping to receive digital circuits use, but with lower power consumption.
However, in most of the isolation circuit design practice, often requires both isolated transmission of low frequency signals, and even the DC, and require the transmission of several megahertz frequency signals.
from：http://www.bauercoupling.com/newsd-nid-21.html