Patent Number: 7,612,700

Title: Pipeline type A/D converter apparatus provided with precharge circuit for precharging sampling capacitor

Abstract: In a pipeline type A/D converter apparatus including A/D converter circuit parts connected in cascade with each other and A/D converting a sample hold signal in a pipeline form, each A/D converter circuit part includes a pre-A/D converter circuit for A/D converting an input signal into a digital signal, and a multiplying D/A converter circuit for D/A converting the digital signal 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. A precharge circuit precharges a 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 A/D converter circuit part that presents an output signal corresponding to the input signal to each A/D converter circuit part.

Inventors: Kawahito; Shoji (Shizuoka, JP), Honda; Kazutaka (Shizuoka, JP), Shimizu; Yasuhide (Nagasaki, JP), Tani; Kuniyuki (Gifu, JP), Kurauchi; Akira (Kanagawa, JP), Sushihara; Koji (Nara, JP)

Assignee: Semiconductor Technology Academic Research Center

International Classification: H03M 1/38 (20060101)

Expiration Date: 1/03/02017