Eur. Phys. J. AP 5, 209-214 (1999)
https://doi.org/10.1051/epjap:1999129

RDS and IRDS filters for fast CCD video sensors

¹ Faculté des Sciences, avenue de l'Environnement, 5000 Monastir, Tunisia
² Groupe d'Optique Appliquée, B.P. 28, 67037 Strasbourg Cedex 2, France

Received: 4 December 1997
Revised: 7 July 1998
Accepted: 30 October 1998
Published online: 15 February 1999

Abstract

In this paper we present two filters called Reflection Delayed noise Suppression RDS and Integration Reflection Delayed noise Suppression IRDS which are useful to increase the dynamics of video CCD cameras. The RDS is a band-pass filter built with a parallel short-circuited line. It lowers significantly the most important noise which is called reset noise. Unfortunately, this signal processing unit increases the contribution of thermal fluctuations by about 3 dB. To overcome this disadvantage, a triggered low-pass filter can be added to the RDS which leads to the IRDS cell. First, we will describe both systems, and then we will compare their effects, in a theoretical way and by experimentation, on the unsampled noises (i.e. the thermal and flicker noises) generated in the CCD sensor.