A/D CONVERTER

摘要

PURPOSE: An A/D converter is provided to realize low power consumption with high-speed and high-precision. CONSTITUTION: An A/D converter(100) includes a reference voltage generator circuit(111), a differential amplifier array(112), and an operating circuit(113). The A/D converter(100) further includes an encoder circuit(105). The reference voltage generator circuit(111) generates a plurality of reference voltages(VR1-VRm+1). The differential amplifier array(112) includes m+1 differential amplifiers(A1-Am+1) and amplifies voltage differences between each of the plurality of reference voltages(VR1-VRm+1) and an input analog signal voltage(Ain) input via an analog signal voltage input terminal(104), so as to generate a plurality of output voltage sets. The operating circuit(113) receives the plurality of output voltage sets and is operated in accordance with a clock signal. The operating circuit(113) further includes n+1 comparator circuits. Each of the comparator circuit has four input terminals.