A novel approach to analog signal isolation through digital opto-coupler (YOUTAB)

Abstract

Major concerns which clearly express necessity of analog isolator applications, are removing ground loop, increasing common-mode voltage rejection, improving noise immunity and protecting operator, expensive equipment and data from transient voltages. Optical coupling is an approach to signal isolation in which all mentioned benefits are covered. This paper is going to propose a novel idea of a particular optical analog signal isolator. It is introduced for the first time and therefore the authors named it YOUTAB. The digital photocoupler NEC-PS2501 constitutes the main structure of this new isolator. In general, the proposed configuration consist of two different parts that one of them transfers the signal and the other establishes a negative feedback to ensure that the output signal has the same features of the input signal. The operation, analysis and computer simulation results are shown. The simulation results show that this novel proposed analog isolator is linear in a wide range of inputs.