Showing papers by "Robert W. Brodersen published in 1975"

Experimental characterization of transfer Efficiency in charge-coupled devices

Abstract: The most important characteristic of a charge-coupled device is its charge transfer efficiency (CTE). There are three basic types of loss which degrade CTE: fixed loss, proportional loss, and nonlinear loss. Examples are given of each type of loss and techniques for measurement of all three types of loss are described. A method of determining the minimum fat zero which eliminates fixed loss is shown and an experiment is presented which confirms that fixed loss due to surface states can be completely eliminated by the use of a fat zero. The effect of interelectrode gaps on CTE is discussed in detail. A nonlinear loss model is used to describe the dispersion due to barriers in the gaps and the very detrimental effect of wells in the gap region is shown. The techniques presented in the analysis of these losses are very general and can be used whenever a detailed description of the transfer loss mechanism is required.

A 500-point fourier transform using charge-coupled devices

Abstract: A CCD transversal filter chip, which performs a 500-point discrete Fourier transform using the chirp z-transform algorithm, will be described. Performance characteristics will be demonstrated, new operational modes presented, and system applications discussed.

Applications of charge-coupled device transversal filters to communication

Abstract: The paper discusses the computational power of state-of-the-art charged-coupled device (CCD) transversal filters in communications applications. Some of the performance limitations of CCD transversal filters are discussed, with attention given to time delay and bandwidth, imperfect charge transfer efficiency, weighting coefficient error, noise, and linearity. The application of CCD transversal filters to matched filtering, spectral filtering, and Fourier analysis is examined. Techniques for making programmable transversal filters are briefly outlined.

The Technology Of Charge-Coupled Devices For Video Bandwidth Reduction

Abstract: Charge-coupled devices (CCD's) are analog sampled-data delay lines which can be used to implement many of the filtering functions required for transform encoding in video bandwidth reduction. The CCD transversal filter is a fundamental building block which is particularly cost effective in terms of it's simplicity and versatility. In particular it can be used to perform the Fourier transform of video signals by means of the chirp z-transform (CZT) algorithm. CCD's have performance limitations compared to digital filters, but for applications which fall within their performance ranges, CCD's offer advantages of lower cost, smaller size, lighter weight, lower power and improved reliability over digital filters.© (1975) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.