WORKSHOP PAPER
Analog Readout Circuitry for Wide-Dynamic-Range CMOS image sensors
Jose Tejada1, Hirokazu Sawada1, Shigetoshi Sugawa2, Nana Akahane2
1Texas Instruments Japan,
2Tohoku University, Japan,

Abstract

This paper describes the readout circuitry of a SVGA wide-dynamic-range (>90dB) CMOS image sensor, which is the first of its class to operate at 60 frame/s. Lateral-overflow capacitor CMOS image sensors [1,2] require two images per frame as well as low noise and highly linear circuits. To achieve these specs, high-output impedance pixel current sources with smooth start-up and a 36MHz segmented line memory were implemented. Supporting blocks like the voltage regulators and output amplifier are described too. The chip was made in a 2P3M CIS 0.18µm process.
Publisher: IISS (Int. Image Sensors Society)
Year: 2007
Workshop: IISW
URL: https://doi.org/10.60928/5lo3-krpy
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Keywords

CMOS image sensors, wide-dynamic-range, readout circuitry,

References

1) S. Sugawa et al., "2005 ISSCC Dig. Tech. Papers, pp.352-353", 2005, 2005
2) N. Akahane et al., "IEEE J. Solid-State Circuits, vol.41, no.4, pp.851-858", 2006, 2006
3) C. Toumazou et al., "Analogue IC design: the current-mode approach, chapter 7. ISBN-13: 978-0863412974"
4) Duque-Carrillo, J.F. et al., "IEEE Trans. Electron Devices, vol.42, no.3, pp.190-192", 1995, 1995