Title :
A low-noise oversampling signal detection technique for CMOS image sensors
Author :
Kawai, N. ; Kawahito, S.
Author_Institution :
Graduate Sch. of Electron. Sci. & Technol., Shizuoka Univ., Japan
fDate :
6/24/1905 12:00:00 AM
Abstract :
In this paper, we propose a method of low-noise signal readout using frame oversampling and a CMOS image sensor with non-destructive high-speed readout mode. The technique enables the use of high-gain column amplifiers and the digital integration of signals without noise accumulation. The column amplifier is effective for reducing the noises due to the wideband amplifier and the quantization noises. Simulation results show that the noise can be reduced by a factor of 20 log10 M [dB] where M is the oversampling ratio.
Keywords :
CMOS image sensors; digital readout; nondestructive readout; quantisation (signal); signal detection; signal sampling; CMOS image sensors; active pixel circuit; differential pulse code modulation; digital integration; frame oversampling; high-gain column amplifiers; low-noise signal readout; nondestructive high-speed readout mode; oversampling signal detection technique; predictive encoder; quantization noises; wide dynamic range; wideband amplifier noises; CMOS image sensors; CMOS technology; Charge coupled devices; Circuit noise; Diodes; Noise level; Noise reduction; Pulse amplifiers; Signal detection; Signal processing;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2002. IMTC/2002. Proceedings of the 19th IEEE
Print_ISBN :
0-7803-7218-2
DOI :
10.1109/IMTC.2002.1006851
