A 2.7-M Pixels 64-mW CMOS Image Sensor With Multicolumn-Parallel Noise-Shaping SAR ADCs

作者：Hwang Sun Il; Chung Jae Hyun; Kim Hyeon June; Jang Il Hoon; Seo Min Jae; Cho Sang Hyun; Kang Heewon; Kwon Minho; Ryu Seung Tak^*

来源：IEEE Transactions on Electron Devices, 2018, 65(3): 1119-1126.

DOI：10.1109/TED.2018.2795005

• CMOS image sensor (CIS)
• delta-readout scheme
• noise-shaping successive-approximation register analog-to-digital converter (SAR ADC)
• oversampling

This paper presents a CMOS image sensor (CIS) utilizing a noise-shaping successive-approximation register analog-to-digital converter (SAR ADC) incorporating the delta-readout scheme. While the noise-shaping SAR ADC with a proposed two-tap passive finite-impulse response (FIR) filter improves effective resolution, the delta-readout scheme reduces its power consumption. A prototype 1920 x 1440 pixel CIS was fabricated in a 90-nm CIS process. A single-channel readout SAR ADC occupying an area of 22.4 mu mx 715 mu m was implemented for reading out 16 columns of pixel array, consuming 437 mu W. Owing to the proposed noise-shaping SAR ADC with oversampling ratio of 16, this paper achieves a noise reduction of 14 dB compared with the noise of a conventional SAR ADC. The delta-readout reduces the power consumption of the SAR ADC by 10% due to the high hit rate of the full high definition image format. The measured differential nonlinearity of the ADC is + 0.77/-0.54 LSB and the integral nonlinearity is + 0.81/-0.5 LSB. The prototype CIS consumes a total power of 64 mW and achieves a dynamic range of 66.5 dB and a figure of merit of 127 mu V.nJ at a data rate of 138 Mpixels/s.

• 出版日期2018-3