Patent ID: 6150850
Filing Date: 2000-11-21
Classification: H03K,H03M

Abstract:
A chopper type comparator comprising a first switching means connected between a reference voltage input terminal and a first node, a second switching means connected between an analog signal input terminal and the first node, a first capacitor in which one electrode is connected to the first node, a first inverter in which an input terminal is connected to the other electrode of the first capacitor, a second capacitor in which one electrode is connected to the output terminal of the first inverter, a second inverter in which the input terminal is connected to the other electrode of the second capacitor, a third switching means connected between the input terminal and the output terminal of the first inverter, a fourth switching means connected between the input terminal and the output terminal of the second inverter, and a fifth switching means connected between one electrode and the other electrode of the second capacitor; that when the second, third, fourth, and fifth switching means are simultaneously conductive, an analog signal input period starts; that when the second switching means is nonconductive, a holding period starts; and that the third, fourth, and fifth switching means are nonconductive for said holding period; that when the first switching means is conductive, a reference voltage input period starts, so that the comparison result for the analog signal and the reference voltage is output.