Importance

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Abstract

An isolation amplifier especially suited for magnetic flowmeters includes circuitry for converting an analog input signal to a duty cycle imposed upon a digital waveform, including generating clock pulses for synchronizing the digital waveform. Low-cost opto-couplers are provided for optically transmitting the digital waveform and information representative of the clock pulses across a barrier which would degrade the analog input signal and for receiving the optically transmitted digital waveform and clock pulse information and recreating the digital waveform with imposed duty cycle therefrom. Circuitry for digitally ranging the duty-cycle signal before the analog signal is reconstructed is also disclosed.

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First Claim