
Proceedings Paper
Analysis of pixel gain and linearity of CMOS image sensor using floating capacitor load readout operationFormat | Member Price | Non-Member Price |
---|---|---|
$17.00 | $21.00 |
Paper Abstract
In this paper, we demonstrate that the floating capacitor load readout operation has higher readout gain and wider
linearity range than conventional pixel readout operation, and report the reason. The pixel signal readout gain is
determined by the transconductance, the backgate transconductance and the output resistance of the in-pixel driver
transistor and the load resistance. In floating capacitor load readout operation, since there is no current source and the
load is the sample/hold capacitor only, the load resistance approaches infinity. Therefore readout gain is larger than that
of conventional readout operation. And in floating capacitor load readout operation, there is no current source and the
amount of voltage drop is smaller than that of conventional readout operation. Therefore the linearity range is enlarged
for both high and low voltage limits in comparison to the conventional readout operation. The effect of linearity range
enlargement becomes more advantageous when decreasing the power supply voltage for the lower power consumption.
To confirm these effects, we fabricated a prototype chip using 0.18um 1-Poly 3-Metal CMOS process technology with
pinned PD. As a result, we confirmed that floating capacitor load readout operation increases both readout gain and
linearity range.
Paper Details
Date Published: 20 March 2015
PDF: 10 pages
Proc. SPIE 9403, Image Sensors and Imaging Systems 2015, 94030E (20 March 2015); doi: 10.1117/12.2083111
Published in SPIE Proceedings Vol. 9403:
Image Sensors and Imaging Systems 2015
Ralf Widenhorn; Antoine Dupret, Editor(s)
PDF: 10 pages
Proc. SPIE 9403, Image Sensors and Imaging Systems 2015, 94030E (20 March 2015); doi: 10.1117/12.2083111
Show Author Affiliations
Published in SPIE Proceedings Vol. 9403:
Image Sensors and Imaging Systems 2015
Ralf Widenhorn; Antoine Dupret, Editor(s)
© SPIE. Terms of Use
