Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB, Canada.
Sensors (Basel). 2013 Aug 16;13(8):10765-82. doi: 10.3390/s130810765.
Like the human eye, logarithmic image sensors achieve wide dynamic range easily at video rates, but, unlike the human eye, they suffer from low peak signal-to-noise-and-distortion ratios (PSNDRs). To improve the PSNDR, we propose integrating a delta-sigma analog-to-digital converter (ADC) in each pixel. An image sensor employing this architecture is designed, built and tested in 0.18 micron complementary metal-oxide-semiconductor (CMOS) technology. It achieves a PSNDR better than state-of-the-art logarithmic sensors and comparable to the human eye. As the approach concerns an array of many ADCs, we use a small-area low-power delta-sigma design. For scalability, each pixel has its own decimator. The prototype is compared to a variety of other image sensors, linear and nonlinear, from industry and academia.
与人类眼睛类似，对数图像传感器可以轻松地在视频速率下实现宽动态范围，但与人类眼睛不同的是，它们的峰值信噪比和失真比（PSNDR）较低。为了提高 PSNDR，我们建议在每个像素中集成一个∆-Σ 模数转换器（ADC）。采用这种架构的图像传感器采用 0.18 微米互补金属氧化物半导体（CMOS）技术进行设计、构建和测试。它实现了优于现有对数传感器的 PSNDR，可与人类眼睛相媲美。由于该方法涉及到许多 ADC 的阵列，因此我们使用小面积低功耗的∆-Σ 设计。为了实现可扩展性，每个像素都有自己的抽取器。该原型与来自工业界和学术界的各种其他线性和非线性图像传感器进行了比较。
