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An ULV PWM CMOS Imager With Adaptive-Multiple-Sampling Linear Response HDR Imagi
本文介绍了一种超低电压PWM CMOS图像传感器,适用于物联网和人工智能应用。
0.18-µm CMOS, 0.4V, 60.1 dB PSNR, 141 dB DR
超低电压PWMCMOS图像传感器自适应多次采样高动态范围
▸创新点1:超低电压PWM像素设计(电路创新)。采用0.4V超低电压工作,集成阈值变化消除(TVC)技术,实现+0.36%/-0.29%的非线性度和0.159%的固定模式噪声(FPN),显著提升低功耗下的成像精度。
▸创新点2:自适应多次采样方案(AMS)(系统创新)。提出像素级自适应多次采样机制,结合4次采样操作将总噪声降低至9.42e-,动态范围达141dB(HDR模式),兼顾能效与信噪比优化。
▸创新点3:双斜率斜坡参考技术(DSR)(方法创新)。通过创新的双斜率参考电压生成方法,支持n次多重采样,实现60.1dB峰值信噪比(PSNR)的线性响应模式,增强弱光环境下的信号处理能力。
▸创新点4:多模式集成架构(系统创新)。在单芯片中整合HDR成像(141dB)、线性响应(60.1dB PSNR)和能量收集(15.5µW@60klx)三种功能,为IoT/AI应用提供全场景解决方案。
Abstract
This paper presents an ultra-low-voltage (ULV)
300 × 200 pixel pulsewidth-modulation (PWM) CMOS imager
with monitoring and capturing for Internet-of-Things (IoT) and
artificial intelligent (AI) applications, fabricated in the CMOS
0.18-µm standard process technology. In always-
ON monitoring
operation, the imager provides high dynamic range (HDR) and
energy harvesting (EH) modes for event detection and energy
collection, respectively. In low-power image capturing operation,
the imager provides a