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A 256×256 CMOS imaging array with wide dynamic range pixels and column-parallel digital output

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4 Author(s)
Decker, S. ; MIT, Cambridge, MA, USA ; McGrath, R.D. ; Brehmer, K. ; Sodini, C.G.

A stepped reset-gate voltage technique is applied to a CMOS active pixel sensor array to increase dynamic range by 26 dB. A frame rate of 390 frames/s is achieved using column-parallel output circuits. Switched-capacitor correlated double-sampling circuits reduce fixed-pattern noise to 4.0 mV (dark). Cyclic analog-to-digital converters achieve approximately 9-b accuracy. At 30 frames/s, random noise is 0.56 mV (dark), optical dynamic range is 96 dB, and power is 52 mW

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:33 ,  Issue: 12 )

Date of Publication:

Dec 1998

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