Patent ID: 6191717
Filing Date: 2001-02-20
Classification: H04B,H04L,H04M

Abstract:
An isolation system for conveying an analog information signal from a transmitting circuit to a receiving circuit while electrically isolating the transmitting circuit from the receiving circuit, comprising:a) an analog-to-digital converter having an input connected to receive the analog information signal from the transmitting circuit and an output providing a digital data signal;b) an encoder circuit connected to the output of the analog-to-digital converter for encoding the digital data signal into a selected format;c) an oscillator circuit connected to the analog-to-digital converter and to the encoder circuit to provide a clock signal thereto;d) a driver circuit connected to receive the encoded digital signal from the encoder circuit and providing a digital output signal;e) a first isolation capacitor having an input connected to receive the digital output signal from the driver circuit;f) a clock recovery circuit having an input connected to an output of the isolation capacitor, the clock recovery circuit providing a clock signal that is substantially synchronized with the clock signal provided by the oscillator circuit;g) a decoder circuit having a decoder input connected to the isolation capacitor output, a clock input connected to receive a clock signal from the clock recovery circuit, and a digital data output; andh) a digital-to-analog converter connected to the digital data output, the digital-to-analog converter having an output terminal for providing an isolated analog signal to the receiving circuit.