Patent ID: 7847720

Claim:
A pipelined analog-to-digital converter, comprising: at least one multiplying digital-to-analog converter comprising: at least one first capacitor; at least one second capacitor; an amplifier coupled to the first and the second capacitors; a plurality of switches for controlling a connection between the first and the second capacitors according to a first control signal, a second control signal and a digital signal, wherein in a first period, the first capacitor is connected to the second capacitor in parallel, and in a second period, the first capacitor is connected to the second capacitor in series, and a first switch among the switches is composed of a first transistor; and at least one sub-ADC for providing a digital signal according to the first and second control signals, wherein a well of the first transistor receives an input signal of the multiplying digital-to-analog converter and a power signal alternately.