Transformer-isolated analog-to-digital converter (adc) feedback apparatus and method

A method for measuring an analog input signal, comprising:

• converting the analog input signal to digital values using an analog-to-digital converter circuit;
• first providing the digital values as modulated information to a first winding of a transformer;
• demodulating the modulated information at a second winding of the transformer;
• second providing at least one of a clock signal or a power supply waveform to the second winding of the transformer;
• receiving at least one of the clock signal or the power supply waveform at the first winding of the transformer;
• and
• supplying the received clock signal or power supply waveform to the analog-to-digital converter circuit, whereby the analog-to-digital converter circuit is provided with at least one of operational clock or power.

An integrated circuit, comprising:

• an analog-to-digital converter circuit;
• a pair of terminals for connection to a first winding of a transformer and coupled to an output of the analog-to-digital converter circuit for providing digital values to a receiver integrated circuit connected to a second winding of the transformer;
• and
• a clock or power reception circuit for deriving at least one of a clock signal or power from the first winding of the transformer and having an output coupled to the analog-to-digital converter circuit for providing at least one of power or clock information to the analog-to-digital converter circuit.