This paper presents a 2.1 M pixel, 120 frame/s CMOS image sensor with column-parallel delta-sigma (Δ Σ) ADC architecture. The use of a second-order Δ Σ ADC improves the conversion speed while reducing the random noise (RN) level as well. The Δ Σ ADC employing an inverter-based Δ Σ modulator and a compact decimation filter is accommodated within a fine pixel pitch of 2.25-μm and improves energy efficiency while providing a high frame-rate of 120 frame/s. A prototype image sensor has been fabricated with a 0.13- μm CMOS process. Measurement results show a RN of 2.4 erms- and a dynamic range of 73 dB. The power consumption of the prototype image sensor is only 180 mW. This work achieves the energy efficiency of 1.7 e-nJ.
Bibliographical noteFunding Information:
Manuscript received April 24, 2010; revised June 25, 2010; accepted September 10, 2010. Date of publication November 22, 2010; date of current version December 27, 2010. This paper was approved by Guest Editor Kofi Makinwa. This work was supported by Samsung Electronics and partially supported by Priority Research Centers Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2009-0093823).
All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering