Patent ID: 6683554
Filing Date: 2004-01-27
Classification: H03M

Abstract:
An analog-to-digital conversion circuit having a multi-stage pipeline structure comprising a plurality of stages of circuits,each of the stages of circuits excluding the final-stage circuit comprising an analog-to-digital converter that converts an inputted analog signal into a digital signal, a first operational amplification circuit that amplifies the inputted analog signal, a digital-to-analog converter that converts the digital signal outputted from said analog-to-digital converter into an analog signal, and a second operational amplification circuit that amplifies the difference between the analog signal outputted from said first operational amplification circuit and the analog signal outputted from said digital-to-analog converter, in at least one of the stages of circuits excluding the final-stage circuit, said first operational amplification circuit having a gain larger than one, and the voltage range of said digital-to-analog converter and the voltage range of said analog-to-digital conversion circuit being independently set, respectively, such that the output voltage range of said first operational amplification circuit and the voltage range of said digital-to-analog converter are substantially equal to each other.