TY - GEN
T1 - A one-shot digital correlated double sampling with a differential difference amplifier for a high speed CMOS image sensor
AU - Son, Suho
AU - Jeon, Shiwon
AU - Namgung, Seol
AU - Yoo, Jieun
AU - Song, Minkyu
N1 - Publisher Copyright:
© 2015 IEEE.
PY - 2015/7/27
Y1 - 2015/7/27
N2 - In order to raise the operating speed of a CMOS image sensor (CIS), a new technique of digital correlated double sampling (CDS) is described. In general, a fixed pattern noise (FPN) of a CIS has been reduced with the subtraction algorithm between the reset signal and pixel signal. This is because a single-slope analog-to-digital converter (ADC) has been normally adopted in the conventional digital CDS with the reset ramp and signal ramp. Thus, the operating speed of a digital CDS is much slower than that of an analog CDS. In order to improve the operating speed, we propose a one-shot digital CDS based on a differential difference amplifier (DDA) that compares the reset signal and the pixel signal using only one ramp. The prototype CIS has been fabricated with 0.13μm CIS technology and it has the VGA resolution of 640×480. The measured conversion time is 16 μs, and a high frame rate of 131fps is achieved at the VGA resolution.
AB - In order to raise the operating speed of a CMOS image sensor (CIS), a new technique of digital correlated double sampling (CDS) is described. In general, a fixed pattern noise (FPN) of a CIS has been reduced with the subtraction algorithm between the reset signal and pixel signal. This is because a single-slope analog-to-digital converter (ADC) has been normally adopted in the conventional digital CDS with the reset ramp and signal ramp. Thus, the operating speed of a digital CDS is much slower than that of an analog CDS. In order to improve the operating speed, we propose a one-shot digital CDS based on a differential difference amplifier (DDA) that compares the reset signal and the pixel signal using only one ramp. The prototype CIS has been fabricated with 0.13μm CIS technology and it has the VGA resolution of 640×480. The measured conversion time is 16 μs, and a high frame rate of 131fps is achieved at the VGA resolution.
KW - CMOS Image Sensor
KW - differential difference amplifier
KW - fixed pattern noise
KW - one-shot digital correlated double sampling
UR - http://www.scopus.com/inward/record.url?scp=84946219363&partnerID=8YFLogxK
U2 - 10.1109/ISCAS.2015.7168818
DO - 10.1109/ISCAS.2015.7168818
M3 - Conference contribution
AN - SCOPUS:84946219363
T3 - Proceedings - IEEE International Symposium on Circuits and Systems
SP - 1054
EP - 1057
BT - 2015 IEEE International Symposium on Circuits and Systems, ISCAS 2015
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - IEEE International Symposium on Circuits and Systems, ISCAS 2015
Y2 - 24 May 2015 through 27 May 2015
ER -