论文信息 - Linear current mode imager with low fix pattern noise

Linear current mode imager with low fix pattern noise

A new imaging architecture with a linear current mode active pixel sensor (APS) is presented. Focal plane image processing in the current domain includes a correlated double sampling (CDS) unit for fixed pattern noise (FPN) suppression. The CDS unit is composed of a first generation current conveyer circuit and a class AB cascaded current memory cell. A measured FPN of 0.9% from saturation level is achieved with the CDS unit compared to 1.9% FPN from current mode images without noise suppression circuitry. A 40 by 40 imaging array was fabricated in a standard 0.5 /spl mu/m process and its functionality was successfully tested. Theoretical analysis for second order non-linear effects is also presented.

Ralph Etienne-Cummings | Viktor Gruev | Timothy K. Horiuchi

[1] Ralph Etienne-Cummings,et al. Implementation of steerable spatiotemporal image filters on the focal plane , 2002 .

[2] Eric R. Fossum,et al. CMOS image sensors: electronic camera-on-a-chip , 1997 .

[3] Bedabrata Pain,et al. On-focal-plane signal processing for current-mode active pixel sensors , 1999 .

[4] Bertram E. Shi. A low-power orientation-selective vision sensor , 2000 .

[5] Marc Tremblay,et al. Mixed-signal VLSI Architecture for Real-Time Computer Vision , 1997, Real Time Imaging.

[6] Christof Koch,et al. Vision Chips: Implementing Vision Algorithms with Analog VLSI Circuits , 1994 .

[7] Yannis Tsividis,et al. Current copier cells , 1988 .

[8] Eric R. Fossum,et al. A current memory cell with switch feedthrough reduction by error feedback , 1994 .

[9] Charles Sodini,et al. Integrated memory/logic architecture for image processing , 1998, Proceedings Eleventh International Conference on VLSI Design.