Digital demodulation for wireless power transfer and related methods

A method, comprising:

• sampling one or more electrical signals received from a wireless power transmitter to provide a sampled signal;
• filtering, with a three-stage cascade filter, the sampled signal to generate a filtered output, the three-stage cascade filter including at least two low pass filter stages that each filter out a fundamental frequency used for power transfer;
• and
• extracting a communication provided by a digital wireless receiver from the filtered output.

A method, comprising:

• receiving a measurement voltage potential proportional to a voltage potential of a transmit coil of a wireless power transmitter;
• providing, by an analog-to-digital converter (ADC), a sampled signal responsive to the measurement voltage potential;
• generating, by a three-stage cascade filter, a filtered measurement voltage potential responsive to a determined peak of the measurement voltage potential or a determined average of the measurement voltage potential, the three-stage cascade filter including at least two low pass filter stages that each filter out a fundamental frequency used for power transfer;
• and
• extracting, by post-processing elements, a communication provided by a digital wireless receiver from the filtered measurement voltage potential.