A design for small analog signal isolation and conversion system

A real time isolation transmitting system has been designed for the weak signals. The small and weak signal amplified by electronic circuit is then input into the isolated conversion system that achieves real-time conversion, isolated transmission and undistorted restoration of the signal. The experimental test results show that the undistorted rate of this system under the electromagnetic interference is more than 90% for the signal frequency below 300 kHz; High credibility could be got for the transmitting signal frequency less than 600 kHz; The relative standard deviation of the output voltage is less than 1% for long-term testing, meaning that the transmitting system has long term stability. (authors)