# Automatic Selection of CDS Timing Parameters

## TL;DR

This paper investigates optimal timing parameter selection for Correlated Double Sampling (CDS) in CCD readout systems, using a digital oversampling approach to analyze effects on noise reduction and linearity.

## Contribution

It introduces a digital oversampling method to analyze and optimize CDS timing parameters, enhancing understanding of their impact on image quality.

## Key findings

- Oversampling enables detailed analysis of CDS timing effects.
- Optimal CDS timing improves linearity and noise performance.
- Method applies to both digital and traditional CDS systems.

## Abstract

CDS is a process used in many CCD readout systems to cancel the reset noise component that would otherwise dominate. CDS processing typically consists of subtracting the integrated video signal during a "signal" period from that during a "reset" period. The response of this processing depends therefore on the shape of the video signal with respect to the integration bounds. In particular, the amount of noise appearing in the final image and the linearity of the pixel value with signal charge are affected by the choice of the CDS timing intervals. In this paper, we use a digital CDS readout system which highly oversamples the video signal (as compared with the pixel rate) to reconstruct pixel values for different CDS timings using identical raw video signal data. We use this technique to develop insights into optimal strategy for selecting CDS timings both in the digital case (where the raw video signal may be available), and in the general case where it is not. In particular, we show that the linearity of the CDS operation allows subtraction of the raw video signals of pixels in bias images from those in illuminated images to directly show the effects of CDS processing on the final (subtracted) pixel values.