A linear stepping PGA used in CMOS image sensors

A low power linear stepping digital programming gain amplifier （PGA） is designed for CMOS image sensors. The PGA consists of three stages with gain range from one to nine, The gain is divided into four regions and each range has 128 linear steps. Power consumption of the PGA is saved by good tradeof...

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Bibliographic Details
Published inJournal of semiconductors Vol. 30; no. 2; pp. 57 - 60
Main Author 徐江涛 李斌桥 赵士彬 李红乐 姚素英
Format Journal Article
LanguageChinese
English
Published IOP Publishing 01.02.2009
Subjects
CMOS
互补金属氧化半导体
半导体技术
场效应
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Summary:A low power linear stepping digital programming gain amplifier （PGA） is designed for CMOS image sensors. The PGA consists of three stages with gain range from one to nine, The gain is divided into four regions and each range has 128 linear steps. Power consumption of the PGA is saved by good tradeoff between variation of amplifier feedback coefficient, pipeline stages and gain regions. With thermometer-binary mixed coding and linear pipeline gain stepping, the load capacitance keeps constant when the gain of one stage is changed. The PGA is designed in the SMIC 0.18 μm process. Simulation results show that the power consumption is 3.2 mW with 10 bit resolution and 10 MSPS sampling rate. The PGA has been embedded in a 0.3 megapixel CMOS image sensors and fabricated successfully.
Bibliography:low power consumption
CMOS image sensor
TN432
CMOS image sensor; programmable gain amplifier; linear stepping; low power consumption
11-5781/TN
linear stepping
programmable gain amplifier
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1674-4926
DOI:10.1088/1674-4926/30/2/025003