A 1000 fps High-Dynamic-Range Global Shutter CMOS Image Sensor with Full Thermometer Code Current-Steering Ramp
Liqiang Han, Ganlin Cheng, Xu Zhang, Gengyun Wang, Weijun Pan, Yao Yao, Guihai Yu, Ruimeng Zhang, Shuaichen Mu, Songbo Wu, Hongbo Bu, Liqun Dai, Ben Fan, Dan Wang, Wei Fan, Ruiming Chen
TL;DR
This paper introduces a high-speed, high-dynamic-range CMOS image sensor with a unique current-steering ramp design for improved performance.
Contribution
The novel contribution is a 1000 fps global shutter CMOS image sensor with a full thermometer code current-steering ramp and 95 dB dynamic range.
Findings
The sensor achieves 95 dB dynamic range with 620 ke- full well capacity.
Pixel noise and non-linearity from parasitic capacitance are analyzed.
A 12-bit thermometer code DAC is used for the ramp generator with high driving capability.
Abstract
We present a 1024 × 512, 1000 fps, high-dynamic-range global shutter CMOS image sensor. The pixel is based on a voltage domain global shutter architecture, featuring a pitch of 24 μm × 24 μm. Both high-gain and low-gain signals can be captured within a single frame. The combined dynamic range is 95 dB, and the full well capacity is 620 ke-. In this paper, we analyze the pixel noise performance as well as the non-linearity and image lag that arise from parasitic capacitance in the pixel. The ramp generator is based on a 12-bit full thermometer code current-steering DAC with high driving capability. We discuss the design considerations for the ramp generator, particularly addressing the phenomenon of non-linear response. Finally, the comparator design and the column readout noise are analyzed.
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Taxonomy
TopicsCCD and CMOS Imaging Sensors · Thin-Film Transistor Technologies · Analytical Chemistry and Sensors