A 15-bit incremental sigma-delta ADC for CMOS image sensor

Nan Chen; Zhengfen Li; Shengyou Zhong; Mei Zou; Libin Yao

doi:10.1117/12.2180830

13 April 2015 A 15-bit incremental sigma-delta ADC for CMOS image sensor

Nan Chen, Zhengfen Li, Shengyou Zhong, Mei Zou, Libin Yao

Proceedings Volume 9522, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics 2014, Part II; 95222A (2015) https://doi.org/10.1117/12.2180830
Event: Selected Proceedings of the Photoelectronic Technology Committee Conferences held August-October 2014, 2014, China, China

Abstract

An incremental sigma-delta ADC is designed for column-parallel ADC array in CMOS image sensor. Sigma-delta modulator with single-loop single-bit structure is chosen for power consumption and performance reasons. Second-order modulator is used to reduce conversion time, without stability problem and large area accompanied by higher order sigma-delta modulator. The asymmetric current mirror amplifier used in integrator reduces more than 30% power dissipation. The digital filter and decimator are implemented by counters and adders with significantly reduced chip area and power consumption. A Clock generator is shared by 8 ADCs for trade-off among power, area and clock loading. The ADC array is implemented in a 0.18-μm CMOS technology and clocked at 10 MHz, and the simulated resolution achieves 15-bit with 255 clock cycles. The average power consumption per ADC is 118 μW including clock generator, and the area is only 0.0053 μm².

Citation Download Citation

Nan Chen, Zhengfen Li, Shengyou Zhong, Mei Zou, and Libin Yao "A 15-bit incremental sigma-delta ADC for CMOS image sensor", Proc. SPIE 9522, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics 2014, Part II, 95222A (13 April 2015); https://doi.org/10.1117/12.2180830

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