Abstract: A servo-linearized opto-electronic analog interface for interconnecting a signal generating device to a communications circuit comprises a first opto-isolator arrangement for transmitting signals from the communications circuit to the signal generating device, and a second opto-isolator arrangement for transmitting signals from the signal generating device to the communications circuit, a transmitting diode of the second opto-isolator arrangement being connected in series with a transmitting diode of a further opto-isolator arrangement forming a feedback path providing servo-linearization of the signal transmitted by the signal generating device via the second opto-isolator arrangement to the communications circuit.