Receiver architecture for digital isolators employing notch filters common mode transient immunity

A method of receiving a signal comprising:

• band-stop filtering a first version of a received signal to attenuate energy in a stopband fSB around a notch frequency fn;
• and
• high-pass filtering a second version of the received signal to attenuate energy below a carrier frequency fc of the received signal, the carrier frequency fc being higher than the notch frequency fn,
• wherein the method of receiving has a propagation delay independent of events being attenuated.

A differential receiver comprising:

• a first circuit configured to attenuate energy in a first frequency range of a frequency response of a received signal, the first frequency range being f≤fc, where f is frequency and fc is a carrier frequency of the received signal;
• a second circuit coupled in series with the first circuit and configured to attenuate energy in a second frequency range of the frequency response of the received signal, the second frequency range being fn/k≤f≤(2×k×fn), where fn is a notch frequency of a notch filter included in a band-stop filter having a stopband around the notch frequency and k is a scaling factor;
• and
• a third circuit coupled in series with the second circuit and configured to remove a carrier wave from an output of the second circuit and recover digital data encoded in the received signal using hysteretic thresholds.