Patent ID: 7612700

Claim:
A pipeline type A/D converter apparatus comprising: a sample holding circuit for sampling and holding an analog input signal, and outputting a sample hold signal; and an A/D converter device including a plurality of A/D converter circuit parts connected in cascade with each other, the A/D converter device A/D converting the sample hold signal in a pipeline form, wherein each of the A/D converter circuit parts comprises: a pre-A/D converter circuit including a plurality of comparators, the pre-A/D converter circuit A/D converting the input signal into a digital signal; and a multiplying D/A converter circuit for D/A converting the digital signal from the pre-A/D converter circuit into an analog control signal, and D/A converting the input signal by sampling, holding and amplifying the input signal using a sampling capacitor based on the analog control signal, and wherein the pipeline type A/D converter apparatus comprises a precharge circuit for precharges the sampling capacitor before sampling so as to attain a predetermined output value in accordance with a digital input to output characteristic substantially adapted to an input to output characteristic of each of the A/D converter circuit part that presents an output signal corresponding to the input signal to each of the A/D converter circuit parts.