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Title:
PIXEL-WISE GAIN-ADJUSTED DIGITAL CONVERSION FOR DIGITAL IMAGE SENSORS
Document Type and Number:
WIPO Patent Application WO/2021/143480
Kind Code:
A1
Abstract:
Techniques are described for digital conversion of pixel signals in a CMOS image sensor (CIS). The CIS includes column-parallel analog-to-digital converters (ADCs), each having a programmable gain amplifier (PGA) supporting N gain settings. Each ADC can execute, for each gain setting (Gn) of the N gain settings, a respective reset phase conversion to obtain a respective baseline offset (BOn) associated with the Gn. A pre-decision value can be determined as a function of a pixel signal, the pre-decision value corresponding to a selected one of the gain settings (Gs). The pixel signal can be converted by using the pre-decision value to set a gain of the PGA to the Gs and obtaining a signal offset (SO). A digital pixel output can be computed for the pixel signal as a function of the SO and the BOs, wherein the BOs is the BOn corresponding to the Gs.

Inventors:
WANG XIAODONG (CN)
Application Number:
PCT/CN2020/139060
Publication Date:
July 22, 2021
Filing Date:
December 24, 2020
Export Citation:
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Assignee:
SHENZHEN GOODIX TECH CO LTD (CN)
International Classes:
H04N5/3745
Domestic Patent References:
WO2016194622A12016-12-08
WO2017222653A12017-12-28
WO2019050606A12019-03-14
Foreign References:
US20160249005A12016-08-25
US20140070074A12014-03-13
Attorney, Agent or Firm:
LONGSUN LEAD IP LTD. (CN)
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