Single slope analog to digital converter using hysteresis property and analog to digital converting method

摘要

A single slope ADC using a hysteresis property includes a first comparator, a second comparator, and a code generating unit. The first comparator outputs a compared signal by receiving and comparing an input signal having a constant level with a ramp signal, the second comparator has a hysteresis property having an input terminal connected to an output terminal of the first comparator, and the code generating unit is connected to the second comparator and outputs a digital code corresponding to a time-point of a state transition of an output signal of the second comparator. The second comparator can be embodied as a Schmidt trigger or a Schmidt-trigger inverter. The single slope ADC further includes a controller that controls at least one of a rising threshold or a failing threshold of the Schmidt trigger or of the Schmidt-trigger inverter.