Demodulator/detector for digital isolators

A method for demodulating a received differential pair of signals, the method comprising:

• centering the received differential pair of signals around a common mode voltage to generate a centered received differential pair of signals;
• and
• removing a carrier signal from the centered received differential pair of signals to generate a demodulated signal;
• generating a logic signal based on the demodulated signal and a predetermined threshold signal, wherein generating the logic signal comprises:
• generating the demodulated signal based on the centered received differential pair of signals, the demodulated signal corresponding to a mean level of a rectified version of the centered received differential pair of signals;
• providing a reference signal based on the predetermined threshold signal;
• and
• wherein the logic signal is generated based on a comparison of the demodulated signal to the reference signal.

A receiver signal path comprising:

• a high pass filter configured to center a received differential pair of signals around a common mode voltage to generate a centered received differential pair of signals;
• a demodulator configured to remove a carrier signal from the centered received differential pair of signals to generate a demodulated signal and configured to generate a logic signal based on the demodulated signal and a predetermined threshold signal;
• and
• a voltage reference signal generator configured to generate the predetermined threshold signal having a voltage level below the common mode voltage.