Data and clock transmission over a magnetic channel

A system comprising:

• a transformer including a primary coil and a secondary coil;
• an excitation driver circuit having a driver input and a driver output, the driver output being coupled to the primary coil, wherein the excitation driver circuit is configurable to provide an excitation signal at a clock frequency at the driver output;
• a clock circuit having a clock output coupled to the driver input and configurable to provide a clock signal at the clock frequency at the clock output;
• a clock detection circuit having a detection input and a detection output, the detection input being coupled to the secondary coil, wherein the clock detection circuit is configurable to provide a detected clock signal at the clock frequency at the detection output based on a secondary voltage across the secondary coil responsive to the excitation signal;
• a data interface circuit having a clock input, a data input and an interface output, the clock input being coupled to the detection output, wherein the data interface circuit is configurable to provide a secondary data signal at the interface output based on the detected clock signal and input data at the data input;
• and
• a circuit coupled between the interface output and the secondary coil, the circuit including a modulation input coupled to the interface output, wherein the circuit is configurable to modulate an impedance across the secondary coil responsive to the secondary data signal.