Phase-based analog-to-digital conversion

A method for converting an analog signal to a digital signal, the method comprising:

• receiving the analog signal as an input voltage;
• converting the input voltage to a phase signal having a phase delay relative to an input clock signal that is proportional to a magnitude of the input voltage;
• digitally quantizing the phase delay of the phase signal relative to the input clock signal;
• and
• providing a digital output signal based on the digital quantization of the phase delay of the phase signal relative to the input clock signal.

A phase-based delta-sigma modulation analog-to-digital converter (ADC) system that is configured to convert an input voltage to a digital output signal, the system comprising:

• a loop filter configured to filter a summation voltage to generate a control voltage;
• a voltage-to-phase converter configured to convert the control voltage to a phase signal corresponding to a phase difference with respect to an input clock signal that is based on a magnitude of the summation voltage;
• a phase-to-digital converter configured to convert the phase signal into the digital output signal having a digital value corresponding to a magnitude of the phase difference;
• and
• a feedback path configured to convert the digital output signal to a feedback voltage that is integrated with the input voltage to generate the summation voltage.