Title:
イメージセンサ用2段階A/D変換器
Document Type and Number:
Japanese Patent JP4069203
Kind Code:
B2
Abstract:
In a conventional CMOS image sensor, an A/D converter for performing A/D conversion at high-speed arranges the A/D converter elements in columns so as to operate in parallel, and has low resolution in the order of 9 or so bits. The present invention provides an A/D converter for an image sensor, which performs a part of the A/D conversion functions by using a noise cancellation circuit in columns and performs amplification simultaneously with this, thereby obtaining a high signal noise ratio (SNR) and implementing an A/D converter with a high resolution along with the A/D conversion section in a subsequent stage.
Inventors:
Shoji Kawahito
Application Number:
JP2003093386A
Publication Date:
April 02, 2008
Filing Date:
March 31, 2003
Export Citation:
Assignee:
National University Corporation Shizuoka University
International Classes:
H03M1/34; H03M1/08; H03M1/16; H04N1/028; H04N5/335; H04N5/355; H04N5/357; H04N5/363; H04N5/374; H04N5/378; H03M1/12; H03M1/56
Domestic Patent References:
| JP2002124877A | ||||
| JP200032342A | ||||
| JP5152959A | ||||
| JP2002261613A | ||||
| JP2002232291A |
Attorney, Agent or Firm:
Yoshiki Hasegawa
Shiro Terasaki
Ichira Kondo
Yuji Suwa
Shiro Terasaki
Ichira Kondo
Yuji Suwa