Patent ID: 7808759

Claim:
An opto-isolator comprising: a transmitter circuit having an electrical-to-optical converter (EOC) control circuit for controlling an EOC, a primary current source for generating a drive current for driving an EOC, an auxiliary current source for providing a corrected drive current for driving an EOC by increasing or decreasing the drive current generated by the primary current source, and a sensor for sensing if a transient event has occurred and, if so, providing information about the transient event to the auxiliary current source; the electrical-to-optical converter (EOC) operatively connected to the transmitter circuit, the EOC receiving the corrected drive current when the EOC control circuit causes the corrected drive current to be provided to the EOC, the EOC producing an optical signal based on the received corrected drive current; and a receiver circuit having an optical-to-electrical converter (OEC), an amplifier, a comparator and an output driver, wherein the GEC receives the optical signal produced by the EOC and converts the optical signal into an electrical signal, the amplifier amplifying the electrical signal from an output of the OEC, the comparator comparing the amplified electrical signal to a reference signal and producing an electrical output signal based on the comparison, the output driver receiving the electrical output signal and producing an electrical output drive signal for the opto-isolator, wherein the sensor senses whether a transient event has occurred by determining whether a common mode pulse waveform has occurred between a reference ground of the transmitter circuit and a reference ground of the receiver circuit.