Download or read book Acoustic Wave Semiconductor Convolver Applied to Electrical and Optical Signal Processing written by Herve Renson Gautier and published by . This book was released on 1975 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies of Acoustic Wave Phenomena written by Stanford University. Microwave Laboratory and published by . This book was released on 1974 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optical Real Time Signal Processors and Semiconductor Surface and Semiconductor Electrolyte Interface Study Using Acoustic Surface Wave written by Pankaj K. Das and published by . This book was released on 1981 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Advances In Surface Acoustic Wave Technology Systems Applications Vol 2 written by Tor A Fjeldly and published by World Scientific. This book was released on 2001-01-31 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Surface Wave Devices for Signal Processing written by D.P. Morgan and published by North Holland. This book was released on 1985 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Advances in Surface Acoustic Wave Technology Systems and Applications written by Clemens C. W. Ruppel and published by World Scientific. This book was released on 2000 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Surface Acoustic Wave Filters written by David Morgan and published by Academic Press. This book was released on 2010-07-27 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book Acoustoelectric Interactions in Acoustic Surface Wave Devices written by Stanford University. Microwave Laboratory and published by . This book was released on 1976 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surface Acoustic Wave Devices and Their Signal Processing Applications written by Colin Campbell and published by . This book was released on 1989 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index written by and published by . This book was released on 1975 with total page 882 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Index written by and published by . This book was released on 1975 with total page 864 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Acoustic Wave Phenomenon for Signal Processing written by Stanford University. Ginzton Laboratory and published by . This book was released on 1978 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Guided wave Optical and Surface Acoustic Wave Devices Systems and Applications written by Chen S. Tsai and published by . This book was released on 1981 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Acousto Optic Interaction in Surface Acoustic Waves and Its Application to Real Time Signal Processing written by D. Schumer and published by . This book was released on 1977 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: The theory of the interaction of coherent light with surface acoustic waves and an experimental demonstration of the application of the interaction to new devices are presented. The analysis, based upon classical electromagnetic theory and a phenomenological formulation of the photoelastic effect, is applied to the piezoelectric material LiNbO3, and provides good agreement with previously published experimental data. Explicit account is taken of the linear electro-optic and linear elasto-optic contributions to the interaction. The experimental demonstration of applications is restricted to the side-entry technique, an interaction configuration providing the longest interaction length between a surface acoustic wave and unguided optical wave. The relative merits of this configuration are discussed. New experimental results for the real-time side-entry convolver employing optical heterodyning include autocorrelation of Barker codes, ambiguity function generation, demonstration of a parallel acoustic track geometry to inhibit reflections, and measurement of diffraction characteristics for polarized light. Results are given for the correlation of a time varying light intensity distribution with an electrical signal, and the application to an optical communication system is indicated. The scanning of one and two dimensional black and white transparencies is performed, and the extension to color image scanning is demonstrated. All experiments are performed using Y-cut Z-propagating LiNbO3. Acoustic frequencies employed range from 45 MHz to 100 MHz. Laser sources are HeNe and Ar. Devices are analyzed and discussed with reference to the diffraction integral of scalar diffraction theory.
Download or read book 1975 Ultrasonics Symposium Proceedings written by John De Klerk and published by . This book was released on 1975 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt:
