ANALOG/DIGITAL CONVERTER FOR LOW VOLTAGE

摘要

PURPOSE: An analog/digital converter is provided to improve the integration activity by making the sampling block formed at the input terminal of a comparator applicable in the range of o-vdd. CONSTITUTION: The sampling block composed of NMOS transistors of the analog/digital converter comprises; NMOS transistor(NM1)(NM4) to switch a positive input value(INP) and a negative input vale(INN) by means of an inputted motion clocks(PH1); NMOS transistors(NM2)(NM3) to switch a positive reference voltage(VREFP) and a negative reference voltage(VREFN), by means of a motion clock(PH2). NMOS transistors(NM5)(NM6) to store and output the voltage value sampled as NMOS transistors (NM1)(NM2)(NM3)(NM4) are switched.