DocumentCode :
3667151
Title :
A correlated multiple sampling passive switched capacitor circuit for low light CMOS image sensors
Author :
Assim Boukhayma;Arnaud Peizerat;Christian Enz
Author_Institution :
LETI, CEA, Grenoble, France
fYear :
2015
fDate :
6/1/2015 12:00:00 AM
Firstpage :
1
Lastpage :
4
Abstract :
After a brief review of the principle of correlated multiple sampling (CMS) and its implementation techniques in CIS readout chains, a simple CMS passive circuit that (i) requires no additional active circuitry, (ii) has no impact on the output dynamic range and (iii) does not need multiple analog-to-digital conversions (faster) is presented. The proposed circuit uses n switched capacitors to perform a CMS on 2n samples. It is validated using transient noise simulations on a CIS readout chain based on a 4T pixel, designed with a 180nm CIS process. For a line readout time of 35 μs and a column amplifier bandwidth of 256 kHz, the proposed circuit reduces the input-referred noise as expected by an ideal CMS.
Keywords :
"Capacitors","Thermal noise","1f noise","CMOS image sensors","Analog-digital conversion","Dynamic range"
Publisher :
ieee
Conference_Titel :
Noise and Fluctuations (ICNF), 2015 International Conference on
Type :
conf
DOI :
10.1109/ICNF.2015.7288563
Filename :
7288563
Link To Document :
بازگشت