Abstract: A method and apparatus converts an analog signal into a digital representation. The method comprises the steps of generating a quantity N of time-varying reference signals, where N is an integer greater than or equal to one, comparing an amplitude of the analog signal to an amplitude of each of the reference signals to determine whether the analog signal amplitude is greater than, less than or equal to reference signal amplitudes, and producing a timestamp each time the analog signal and reference signal amplitudes are equal. The apparatus comprises a reference signal generator and a quantity N of comparators, each of the comparators being connected to receive the analog signal, separately to receive a different one of the reference signals, and to produce a digital signal. The analog signal may be reconstructed from the digital representation.