Patent ID: 7319261

Claim:
A MOS integrated one-way isolation coupler for use in a MOS integrated circuit on a semiconductor chip for providing an output signal in response to an input signal but electrically isolated therefrom, the isolation coupler comprising: an inductor coil on the semiconductor chip for receiving the input signal and for generating a magnetic field in response to the input signal, the inductor coil having at least one turn and defining a central axis, a MAGFET having a split drain defining a pair of drain portions wherein the current difference between the drain currents of the respective drain portions of the split drain is a function of the magnetic field to which the MAGFET is subjected, the MAGFET being located on the semiconductor chip relative to the inductor coil so that the current difference between the drain currents of the respective drain portions of the split drain is responsive to the magnetic field generated by the inductor coil in response to the input signal for providing the output signal, and the MAGFET is electrically isolated from the inductor coil so that the output signal is electrically isolated from the input signal.