Title:
画像フロントエンド用のスイッチ式キャパシタ入力段
Document Type and Number:
Japanese Patent JP5579738
Kind Code:
B2
Abstract:
Embodiments of the present invention provide an apparatus and control method for an analog front end (AFE) amplifier for controlling DC restore operations. According to the exemplary method, a first input stage of the AFE is controlled to operate as a continuous time amplifier that has high input impedance and draws substantially no input leakage current for a first predetermined area of an imaging sensor image array. The first input stage is controlled to operate as a sample and hold amplifier with DC restore functionality for a second predetermined area of the imaging sensor image array. According to an embodiment, the AFE input stage operates as a continuous time amplifier when reading pixels from the sensor's active image array but operates as a sample and hold amplifier with DC restore when reading pixels from the image array that correspond to so-called ‘black-level’ pixels or pixels that otherwise fall outside the sensor's active image field.
Inventors:
Ronald カプスタ
Katsushi Nakamura
Katsushi Nakamura
Application Number:
JP2011538666A
Publication Date:
August 27, 2014
Filing Date:
November 24, 2009
Export Citation:
Assignee:
Analog ディヴァイスィズ Ink
International Classes:
H04N5/378; H03F3/34; H04N5/232; H04N5/357
Attorney, Agent or Firm:
Yasuhiko Murayama
Masatake Shiga
Takashi Watanabe
Shinya Jitsuhiro
Masatake Shiga
Takashi Watanabe
Shinya Jitsuhiro