A Wide Bandwidth Isolation Amplifier Design Using Current Conveyors

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In this paper, the dual-channel optocoupler and current conveyors are employed to achieve the wide bandwidth isolation amplifier. The high gain feedback technique and pole-zero compensation are applied to overcome the inherent nonlinear characteristics of optocouplers and to obtain a good transient response. Its bandwidth is up to 570 kHz with linear transfer characteristics. The maximum noise signal level in the frequency range up to 1.25 MHz is less than 31.6 μV. The mathematical model of proposed isolation amplifier is verified with experimental and simulation results. The dynamic responses and static characteristics are also demonstrated with experimental results.

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