Patent ID: 7847601
Filing Date: 2010-12-07
Classification: H03K

Abstract:
1. A comparator, comprising: a plurality of switches for providing an input signal during a first period and providing a reference signal during a second period, wherein a first switch among the switches is composed of a first transistor; a capacitor for receiving the input signal during the first period and receiving the reference signal during the second period; an amplifier coupled to the capacitor for receiving a difference voltage between the input signal and the reference signal and amplifying the difference voltage during the second period to generate an amplified result; and a determining circuit for providing a digital signal according to the amplified result, wherein the capacitor only utilizes the first transistor to receive the input signal during the first period, wherein the first transistor comprises a P-type channel, and wherein the first transistor comprises a base receiving the input signal during the first period and receiving a power voltage during the second period, and the power voltage exceeds the input signal.