MULTI-COMPARISON A / D CONVERTER USING THE INTERPOLATION PRINCIPLE

摘要

The present invention relates to a Vin and Vref voltage comparator known as "auto-zero", as well as an analog-digital converter (A / D) using a set of so-called "auto-zero" comparator making it possible to reduce the number of comparators necessary for the A / D conversion. This comparator is characterized in that it comprises a second stage constituted by :. an inverter function carried out 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 auto-zero phase ,. and a third transistor used in capacitance and connected to the gate of the second transistor on the one hand, and to the supply voltage on the other hand. The present invention applies in particular to all types of CMOS A / D converters with multiple comparisons using at least one so-called "auto-zero" comparator. /P