Affiliation:
1. Department of Electronic Engineering, Xi’an University of Technology, No. 5, Jinhua South Road, Xi’an 710054, China
Abstract
In order to solve the problem of limited linearity and frame rate in the large array infrared (IR) readout integrated circuit (ROIC), a high-linearity and high-speed readout method based on adaptive offset compensation and alternating current (AC) enhancement is proposed in this paper. The efficient correlated double sampling (CDS) method in pixels is used to optimize the noise characteristics of the ROIC and output CDS voltage to the column bus. An AC enhancement method is proposed to quickly establish the column bus signal, and an adaptive offset compensation method is used at the column bus terminal to eliminate the nonlinearity caused by the pixel source follower (SF). Based on the 55 nm process, the proposed method is comprehensively verified in an 8192 × 8192 IR ROIC. The results show that, compared with the traditional readout circuit, the output swing is increased from 2 V to 3.3 V, and the full well capacity is increased from 4.3 Me- to 6 Me-. The row time of the ROIC is reduced from 20 µs to 2 µs, and the linearity is improved from 96.9% to 99.98%. The overall power consumption of the chip is 1.6 W, and the single-column power consumption of the readout optimization circuit is 33 μW in the accelerated readout mode and 16.5 μW in the nonlinear correction mode.
Funder
National Natural Science Foundation of China
Shaanxi innovation Capability Support Project
Key research and development plan of Shaanxi province
Subject
Electrical and Electronic Engineering,Biochemistry,Instrumentation,Atomic and Molecular Physics, and Optics,Analytical Chemistry
Reference17 articles.
1. An ultra-linear CMOS image sensor for a high-accuracy imaging system;Teymouri;Int. J. Circuit Theory Appl.,2018
2. A highly linear and high-accurate CMOS image sensor;Teymouri;Analog. Integr. Circuits Signal Process.,2019
3. A readout structure with double column buses and shared source follower for IRFPAs;Niu;J. Infrared Millim. Waves,2020
4. Li, C., Han, B., He, J., Guo, Z., and Wu, L. (2020). A Highly Linear CMOS Image Sensor Design Based on an Adaptive Nonlinear Ramp Generator and Fully Differential Pipeline Sampling Quantization with a Double Auto-Zeroing Technique. Sensors, 20.
5. Pixel Optimizations and Digital Calibration Methods of a CMOS Image Sensor Targeting High Linearity;Wang;IEEE Trans. Circuits Syst. I Regul. Pap.,2018
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献