Energy-Efficient Motion-Triggered IoT CMOS Image Sensor With Capacitor Array-Assisted Charge-Injection SAR ADC
IEEE Journal of Solid-State Circuits(2019)
摘要
We propose a low-power image sensor with a motion-based triggering feature for the Internet of Things (IoT) applications. The sensor supports the near-pixel [within analog-to-digital converter (ADC)] motion-detection mode run on a heavily subsampled frame (32
$\times $
20 pixels, while consuming only 1.7
$\mu \text{J}$
/frame) to trigger full-array capture only when a significant change has happened in the scene. Also, to maximize energy efficiency and image quality of the sensor, we propose a column-parallel capacitor array-assisted charge-injection SAR ADC that achieves 10b operation with readout noise of 226
$\mu V_{\text {rms}}$
, which can be lowered to 104
$\mu V_{\text {rms}}$
using multiple sampling. The ADC is highly energy efficient with best-in-class energy consumption of 63.6 pJ/frame/pixel and ADC Figure of Merit (FoM) of 14.4
$\mu V_{\text {rms}}\cdot $
nJ in full-array capture mode.
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关键词
Capacitors,Image sensors,Voltage control,Internet of Things,Sensor arrays,Calibration,Signal resolution
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