A cascade A/D converter that has shorter settling time and enables high-speed operation is provided. A cascade A/D converter comprises fundamental constituent elements cascaded in plural stages, each fundamental constituent element comprising a first comparator for inputting an analog input signal, a D/A converter for converting an output of the first comparator to an analog signal again, and a subtractor for subtracting an output of the D/A converter from the analog input signal, the fundamental constituent elements comprising: a second comparator for inputting the analog input signal every least significant bit near a transition point of the first comparator; and an arithmetic operating unit for generating upper bits based on an output of the first comparator and interpolating lower bits based on an output of the second comparator.

 
Web www.patentalert.com

< Integration type A/D converter, and battery charger utilizing such converter

< Methods and apparatus for digital offset correction using an ADC with an increased input range

> A/D converter, digital PLL circuit using the same, and information recording apparatus using the same

> Ramp modulation ADC for imagers

~ 00220