Patent ID: 8116055

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, and a common mode pulse compensation (CMPC) circuit that senses if a common mode pulse event is occurring, and if so, generates a compensation current that is output from a first output terminal of the CMPC circuit to the current source such that the compensation current and the drive current add together to produce a new drive current that is used to drive the EOC, and wherein a common mode pulse event corresponds to a common mode pulse waveform occurring between a reference ground, GND 1 , of the transmitter circuit and a reference ground, GND 2 , of a receiver circuit; the electrical-to-optical converter (EOC) operatively connected to the transmitter circuit, wherein the EOC receives the new drive current from the CMPC circuit and produces an optical signal that is based on the new drive current received by the EOC; and the receiver circuit having an optical-to-electrical converter (OEC), an amplifier, a comparator and an output driver, wherein the OEC receives the optical signal produced by the EOC, converts the optical signal into an electrical signal, and outputs the electrical signal, the amplifier amplifying the electrical signal output from 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.