FOLDING INTERPOLATION ANALOG/DIGITAL CONVERTER

摘要

PURPOSE: A folding interpolation analog/digital converter is provided to exactly correct an analog signal beyond an input range at a digital output terminal. CONSTITUTION: A reference voltage generator(10) generates a plurality of reference voltages having different levels. A plurality of folders(20) each receives an input analog signal and the plurality of reference voltages and outputs a folding signal. An interpolation section(30) outputs folding signals having an additional intersection of the same intervals based on folding signals generated by two adjacent folders. A comparator(40) compares an output signal of the interpolation section(30) with a reference signal and output a comparison result. An encoder(50) encodes the comparison result and outputs least significant bits. An input range excess detecting folder(60) receives the input analog signal and the reference voltage and outputs an analog input range excess detecting signal and an enable signal. An error correcting section(70) logically combines the analog input range excess detecting signal and enable signal from the input range excess detecting folder(60) and a folding signal and outputs an error correcting signal.