Comparator and more compartment comparison - a / d - converter by application of the interpolation principle

摘要

The present invention relates to a comparator of the voltage vin and vref, the so-called "self - zero", as well as a digital / analog converter - (a / n) using a set of comparator with a so-called "auto - zero " making it possible to reduce the number of comparators required for the conversion was / n. This comparator is characterized in that it comprises a second stage constituted by: an inverter function performed in such a way that only a first transistor is controlled at its gate by the preceding stage, a second transistor having its gate and drain short - circuited by a switch during the phase of self - zero, and a third transistor used as a capacitance and connected to the gate of the second transistor, on the one hand, and to the supply voltage of the other part.la present invention is particularly applicable to all types of converters a cmos / n for multiple comparisons using at least one comparator referred to as "auto -.