[PDF] Acoustic Wave Semiconductor Convolver Applied To Electrical And Optical Signal Processing eBook

Author : Herve Renson Gautier
Publisher :
Page : 190 pages
File Size : 33,91 MB
Release : 1975
Category : Acoustic surface acoustic wave devices
ISBN :

GET BOOK

This work presents an experimental and theoretical study of the interactions between acoustic surface waves on a piezoelectric insulator and charge carriers in a neighboring semiconductor separated by a small airgap; and the application of these phenomena to signal processing and optical imaging. Although the two media are mechanically isolated, the electric field associated with the surface waves penetrate into the semiconductor and interact with its charge carriers. This interaction is nonlinear, and, in the case of two oppositely propagating surface waves, real time convolution is performed. A new theory of the convolution interaction, taking into account the possible presence of a depletion, inversion or accumulation layer at the surface of the semiconductor, resulting from a built-in or applied dc field is presented. Experimental measurements for both n- and p-type Silicon on Lithium Niobate systems are in very good agreement with this theory, and they lead to a novel technique of measurement of the surface state distribution on semiconductors. The silicon on lithium niobate structure used gives rise to one of the largest convolution efficiencies reported to date. Several signal processing applications are presented. They show the versatility of the device which can be employed as a programmable filter or a parametric processor. In addition, the first autocorrelation is demonstrated by cascading two convolvers. The acoustic convolver was adapted for the scanning of optical images.

Author : Colin Campbell
Publisher : Elsevier
Page : 485 pages
File Size : 11,60 MB
Release : 2012-12-02
Category : Technology & Engineering
ISBN : 0323148662

GET BOOK

Surface Acoustic Wave Devices and Their Signal Processing Applications is a textbook that combines experiment and theory in assessing the signal processing applications of surface acoustic wave (SAW) devices. The operating principles of SAW devices are described from a circuit design viewpoint. This book is comprised of 18 chapters and begins with a historical background on surface acoustic waves and a discussion on the merits of SAW devices as well as their applications. The next chapter introduces the reader to the basics of acoustic waves and piezoelectricity, together with the effect of acoustic bulk waves on the performance of SAW filters. The principles of linear phase SAW filter design and equivalent circuit models for a SAW filter are then described. The remaining chapters focus on trade-offs in linear phase SAW filter design; compensation for second-order effects; harmonic SAW delay lines for gigahertz frequencies; and coding techniques using linear SAW transducers. The final chapter highlights Some other significant alternative design techniques and applications for SAW devices. This monograph will be suitable for engineering or physics students as well as engineers, scientists, and technical staff in industry who seek further information on SAW-based circuits, systems, and applications.

Author : Pankaj K. Das
Publisher :
Page : 19 pages
File Size : 39,86 MB
Release : 1981
Category :
ISBN :

GET BOOK

The research work can be broadly classified into four categories: (1) a new method for the determination of electrical surface properties of semiconductors using acoustic surface wave delay lines, (2) a new method for the determination of electrical properties of semiconductor-electrolyte interface, (3) optical signal processing using surface acousto-optic interaction, and (4) studies on hot electron properties of semiconductors. The method of surface property determination is sensitive and simple and requires no physical contact with semiconductor surface. The SAW probing technique for electrical characterization of semiconductors has been performed at low temperature down to 77 K. Results obtained with GaAs agree with the theoretical expectations. Oxides have been anodically grown on GaAs and interface properties are being evaluated using the SAW probe. The activation of ion-implanted impurities in silicon by thermal annealing is being monitored by the SAW probing technique. Numerical computations of the transverse acoustoelectric voltage (TAV) have been performed which can be used to quantitatively evaluate the semiconductor properties non-destructively from the experimental TAV data. In connection with semiconductor-electrolyte interface study, the electrical properties of CdS-NiCl2 interface have been determined using the surface acoustic wave technique.

Author : Tor A Fjeldly
Publisher : World Scientific
Page : 374 pages
File Size : 10,18 MB
Release : 2001-01-31
Category : Technology & Engineering
ISBN : 9814491608

GET BOOK

Surface acoustic wave (SAW) devices are recognized for their versatility and efficiency in controlling and processing electrical signals. This has resulted in a multitude of device concepts for a wide range of signal processing functions, such as delay lines, filters, resonators, pulse compressors, convolvers, and many more. As SAW technology has found its way into mass market products such as TV receivers, pagers, keyless entry systems and cellular phones, the production volume has risen to millions of devices produced every day. At the other end of the scale, these are specialized high performance signal processing SAW devices for satellite communication and military applications, such as radar and electronic warfare.This volume, together with Volume 1, presents an overview of recent advances in SAW technology, systems and applications by some of the foremost researchers in this exciting field.

Author : D.P. Morgan
Publisher : North Holland
Page : 452 pages
File Size : 27,2 MB
Release : 1985
Category : Computers
ISBN :

GET BOOK

Recent years have seen the emergence of a wide variety of electronic devices making use of surface acoustic waves in solids. This book focusses on the devices of greatest current interest and on the principles underlying them. An introductory survey is followed by chapters on acoustic wave fundamentals, electric excitation, transducers, multi-strip couplers and propagation effects. The interdigital transducer is emphasised since it is a key element in most devices. The remaining chapters - about half of the book - describe practical devices including delay lines, bandpass filters, chirp filters for pulse-compression radar (including reflective array compressors), convolvers and oscillators. For the main devices the text includes design principles, second-order effects, practical performance and, where appropriate, the role of the device in system applications. Some of the more mathematical details are relegated to Appendices, which include electrode interactions in transducers, sampling theory, the electrostatic element factor and the required relationships from Fourier analysis. A classified list of over 500 references is provided.The book will be of interest to engineers developing surface-wave devices, and to those using the devices in practical systems. It is also very suited for university courses or research work.

Author : Clemens C. W. Ruppel
Publisher : World Scientific
Page : 325 pages
File Size : 13,61 MB
Release : 2000
Category : Technology & Engineering
ISBN : 9810244142

GET BOOK

Surface acoustic wave (SAW) devices are recognized for their versatility and efficiency in controlling and processing electrical signals. This has resulted in a multitude of device concepts for a wide range of signal processing functions, such as delay lines, filters, resonators, pulse compressors, convolvers, and many more. As SAW technology has found its way into mass market products such as TV receivers, pagers, keyless entry systems and cellular phones, the production volume has risen to millions of devices produced every day. At the other end of the scale, there are specialized high performance signal processing SAW devices for satellite communication and military applications, such as radar and electronic warfare. This volume, together with Volume 2, presents an overview of recent advances in SAW technology, systems and applications by some of the foremost researchers in this exciting field.

Author : David Morgan
Publisher : Academic Press
Page : 448 pages
File Size : 27,60 MB
Release : 2010-07-27
Category : Technology & Engineering
ISBN : 0080550134

GET BOOK

Surface Acoustic Wave Filters gives the fundamental principles and device design techniques for surface acoustic wave filters. It covers the devices in widespread use today: bandpass and pulse compression filters, correlators and non-linear convolvers and resonators. The newest technologies for low bandpass filters are fully covered such as unidirectional transducers, resonators in impedance element filters, resonators in double-mode surface acoustic wave filters and transverse-coupled resonators using waveguides. The book covers the theory of acoustic wave physics, the piezoelectric effect, electrostatics at a surface, effective permittivity, piezoelectric SAW excitation and reception, and the SAW element factor. These are the main requirements for developing quasi-static theory, which gives a basis for the non-reflective transducers in transversal bandpass filters and interdigital pulse compression filters. It is also needed for the reflective transducers used in the newer devices. A thorough revision of a classic on surface acoustic wave filters first published in 1985 and still in print Uniquely combines easy-to-understand principles with practical design techniques for all the devices in widespread use today Complete coverage of all the latest devices which are key to mobile phones, TVs and radar systems Includes a new foreword by Sir Eric Albert Ash