DOCSLIB.ORG

US2959674.Pdf

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
US2959674.Pdf Nov. 8, 1960 T. R. O "MEARA 2,959,674 GAIN CONTROL FOR PHASE AND GAIN MATCHED MULTI-CHANNEL RADIO RECEIVERS Filed July 2, 1957 2. Sheets-Sheet 2 PETARD CONVERTER TUBE Ë????Q. F SiGNAL OUTPUT OSC. S. G. INPUT INVENTOR. 77/OMAS A. O’MEAAA AT 7OAPWA 3 2,959,674 United States Patent Office Patented Nov. 8, 1960 1. 2 linear type. By a linear type frequency changer is meant a device with output current or voltage which is a linear 2.959,674 function of either the RF input signal or local oscillator GAIN CONTROL FOR PHASE AND GAN signal alone and with a conversion transconductance MATCHED MULT-CHANNELRADIO RE. 5 characteristic which varies linearly with the magnitude of CEIVERS the voltage at the local oscillator input to the device. Thomas R. O'Meara, Los Angeles, Calif., assignor, by This means that, if instead of being an alternating voltage, meSne assignments, to the United States of America as the RF signal input to the device were maintained at a represented by the Secretary of the Navy constant D.C. voltage and the oscillator signal were re 0. placed by a D.C. voltage excursion, then a plot of the Filed July 2, 1957, Ser. No. 669,691 output current or voltage of the device versus the local oscillator signal voltage would be a straight line. Simi 3 Claims. (Cl. 250-20) larly, if the local oscillator signal voltage input to the device were kept at a constant D.C. value, instead of This invention relates to a gain control for electronic 5 being an A.C. signal, and the RF input signal were re amplifiers and more particularly to a gain control for placed by a D.C. voltage excursion, then a plot of the phase and gain matched multi-channel radio receivers. output current or voltage versus the RF input (D.C. An object of the present invention is to provide an excursion) voltage would be a straight line. apparatus for controlling the gain in all of the channels of The invention accomplishes the desired result with the a multi-channel radio receiver simultaneously in such a 20 use of a multigrid vacuum tube such as the usual penta way that they remain phase and gain matched for all gain grid converter tube operated under certain special condi control settings. tions. The D.C. bias on both the signal grid 16 and the Other objects and many of the attendant advantages of oscillator grid 18 is such as to place the operating point this invention will be readily appreciated as the same of the tube into the center of the aforedescribed linear becomes better understood by reference to the following 25 region. The proper bias for each grid can be determined detailed description when considered in connection with by plotting a family of curves of plate, current versus the accompanying drawings wherein: . - signal grid voltage. Each of the curves is plotted for Fig. 1 is a block diagram of a multi-channel radio a different value of fixed D.C. voltage applied to the . receiver using the invention; and oscillator grid. These values of fixed D.C. voltages are Fig. 2 is a circuit diagram of the frequency converter. 30 separated by equal increments. A D.C. bias voltage for stage of Fig. 1. each grid is then selected which will place the operating. Reference is now made to the drawing. In Fig. 1 there point in the region wherein the curves of this family are is shown a multi-channel radio receiver, each channel of straight lines and where three adjacent members of the which includes a RF amplifier 2 which feeds into a fre family of curves intercept equal distances on a line of quency converter 4 to which is also supplied a voltage 35 constant signal grid voltage. During operation, the oscil from a local oscillator 6 through a gated buffer amplifier lator grid voltage would normally be maintained suffi 8, the local oscillator 6 supplying a voltage common to ciently low so that no grid current flows and the tube all channels. The output of the frequency converter 4 remains in the linear region. Stabilized D.C. bias is main is fed to an intermediate frequency amplifier 10 and tained on both grids, preferably by external fixed bias thence to a detector 12. The output of the several 40 such as the battery shown since this gives better results detectors is shown as being alternatively available to than the usual cathode bias. By choosing the operating operate an automatic gain control in place of the manual points in this manner one is assured that, when the D.C. gain control 14 operating on the gated buffer amplifier 8. voltage excursions are replaced by an A.C. signal voltage In Fig.2 some circuitry details of the converter stage 4 (or an A.C. oscillator voltage), the amplitude of that are shown. Each such stage includes a pentagrid con 45 component of the output signal occurring at the sum (or verter tube or the like onto one control grid 16 of which difference) frequency will vary linearly with the ampli (designated the signal grid) is fed the RF signal from the tude of the signal (or oscillator) voltage up to the largest RF amplifier 2. On to another control grid 18 of the possible signal amplitude in either case. Thus a large converter tube is fed the oscillator signal voltage emanat dynamic range of signal amplitude may result, wherein ing from the amplifier 8. A battery 20 serves to maintain the gain control remains precise (i.e. matched). a stabilized D.C. bias on the grid 16 and a battery 22 With the arrangement described the potentiometer 14 serves to maintain a stabilized D.C. bias on the grid 18. or the alternative automatic gain control serves to match variations in gain on all channels simultaneously and Operation maintains the phases matched also. In order to match the The gains of all of the channels of the receiver are con 55 absolute gains of the channels, that is the actual gains, trolled by varying the amount of the common oscillator it suffices to make one initial adjustment, preferably near voltage generated by the local oscillator 6 injected at the the output, by, for example, attenuating the gain of one oscillator grid 18 of each of the frequency converter tubes channel relative to another to which it is to be matched. in the frequency converter stage of each channel. Any Once this initial adjustment is made and the two channels conventional system can be used to provide the control 60 start out with identical gains, then the variation in their of the injected oscillator voltage. One entirely satisfac gains will be identical and the phases will remain tory way of accomplishing this is in the illustrated em matched. bodiment wherein a buffer amplifier 8 is provided whose From the foregoing it is seen that a gain control sys gain is varied by changing the negative bias of the control tem has been provided which requires no special match grid of the buffer tube. This variable bias may come 65 ing of tubes or other components and requires no par from a potentiometer such as shown at 14 to give a ticular additional adjustment to balance the gain control manual gain control or may come from a rectifier at system operation. the outputs of the receiver intermediate frequency ampli In the special case where the signal applied to the fiers to give an automatic gain control system similar to oscillator grid 18 is a D.C. voltage (variable in value), the conventional variety. 70 which may be regarded as the instance where the fre In order to insure good channel to channel matching quency of the local oscillator is zero, then the output or balance, the frequency changer stage must be of the signal from the frequency converter is at the same fre 2,959,674 3 4. quency as the input RF signal. In a practical situation the scope of the appended claims, the invention may be this D.C. case can be put into practice by disconnecting practiced otherwise than as specifically described. the oscillator signal input in Fig. 2 and varying the What is claimed is: resistor 24 to obtain different D.C. voltages on grid 18. 1. A radio receiver comprising a plurality of channels, The device would then properly no longer be desig 5 each of said channels including a radio frequency an nated as a frequency converter but rather would become plifier stage and a frequency converter stage; each said a gain-controlled amplifier whereas, when operated with frequency converter stage comprising a multigrid vacu a controlled amplitude, A.C. voltage on the oscillator um tube; means biasing, with a stabilized direct current grid, the device could all-embracingly have been desig bias, the signal grid and the oscillator grid of each said nated as a combined frequency converter and gain con 10 tube into the region where the output voltage of Said trol. The special D.C. case has certain characteristics tube is a linear function of either the radio frequency which distinguish it from the frequency changer or dy input signal or the local oscillator signal alone; each said namic case where an A.C. voltage is applied to the oscil radio frequency amplifier stage supplying radio fre lator grid 18. Since the gain of the D.C. operated am quency signal to the signal grid of the tube of its respec plifier cannot be reduced to zero or even extremely low 5 tive frequency converter stage at such a voltage as to values, therefore the obtainable dynamic control ranges maintain said tube within said linear region; a local of the D.C.
Load more

Recommended publications
  • The Output Frequency Spectrum of a Thyristor Phase-Controlled Cycloconverter Using Digital Control Techniques
    University of Plymouth PEARL https://pearl.plymouth.ac.uk 04 University of Plymouth Research Theses 01 Research Theses Main Collection 1985 THE OUTPUT FREQUENCY SPECTRUM OF A THYRISTOR PHASE-CONTROLLED CYCLOCONVERTER USING DIGITAL CONTROL TECHNIQUES LEUNG, CHIU HON http://hdl.handle.net/10026.1/2261 University of Plymouth All content in PEARL is protected by copyright law. Author manuscripts are made available in accordance with publisher policies. Please cite only the published version using the details provided on the item record or document. In the absence of an open licence (e.g. Creative Commons), permissions for further reuse of content should be sought from the publisher or author. THE OUTPUT FREQUENCY SPECTRUM OF A THYRISTOR PHASE-CONTROLLED CYCLOCONVERTER USING DIGITAL CONTROL TECHNIQUES. by CHIU HON LEUNG B.Sc. A.C.G.I. A thesis submitted to the C.N.A.A. in partial fulfilment for the award of the degree of Doctor of Philosophy. Sponsoring Establishment: Plymouth Polytechnic. Collaborating Establishment: Bristol University. August 1985. i PLV<AOUI~a~~~~TOC:·:;::C1 Accn. 6 5 0 0 ~}ti '( -5 :No. .. -r-c;2uiJT u::JJl ~~-nu. X toost<Bt'5 L I DECLARATION I hereby declare that I am not registered for another degree. The following thesis is the result of my own i~~~stigatlon and composed by myself .. It has not been submitted in fuJ.l or in parts for the award of any other C.N.A.A. or University degree. C.H.LEUNG. Date : .S l - -, - S:5 . ii ABSTRACT The output frequency spectrum.of a thyristor phase-controlled cycloconverter using digital control techniques.
    [Show full text]
  • Suitability of a Commercial Software Defined Radio System for Passive Coherent Location
    Suitability of a Commercial Software Defined Radio System for Passive Coherent Location Aadil Volkwin A dissertation submitted to the Department of Electrical Engineering, University of Cape Town, in fulfilment of the requirements for the degree of Master of Science in Engineering. Cape Town, May 2008 Dedicated to: My Parents, my Sister and my Wife. 2 Declaration I declare that this work done is my own, unaided work. This dissertation is being submitted to the Department of Electrical Engineering, University of Cape Town, in fulfilment of the requirements for the degree of Master of Science in Engineering. It has not been submitted for any degree or examination in any other university. ................................................................................ Signature of Author Cape Town 2008 3 Abstract This dissertation provides a comprehensive discussion around bistatic radar with specific reference to PCL, highlighting existing literature and work, examining the various performance metrics. In particular the performance of commercial FM radio broadcasts as the radar waveform is examined by implementation of the ambiguity function. The FM signals show desirable characteristics in the context of our application, the average range resolution obtained is 5.98km, with range and doppler peak sidelobe levels measured at -25.98dB and -33.14dB respectively. Furthermore, the SDR paradigm and technology is examined, with discussion around the design considerations. The USRP, the TVRx daughterboard and GNURadio are examined further as a potential receiver and development environment, in this light. The system meets the low cost ambitions costing just over US$1000.00 for the USRP motherboard and a single daughterboard. Furthermore it performs well, displaying desirable characteristics, The receiver's frontend provides a bandwidth of 6MHz and a tunable range between 50MHz and 800MHz, with a tuning step size as low as 31.25kHz.
    [Show full text]
  • A THESIS Presented to Georgia School of Technology in Partial
    OPTIMUM OPERATING CONDITIONS OF A MULTI-GRID FREQUENCY CONVERTER A THESIS Presented to the Faculty of the Division of Graduate Studies Georgia School of Technology In Partial Fulfillment of the Requirements for the Degree Master of Science in Electrical Engineering William Thomas Clary, Jr. March 1948 C? . F^ 0 5fJ ii OPTIIVIUM OPERATING CONDITIONS OF A MULTI-GRID FREQUENCY CONVERTER Approved: ^2 ^L it Date Approved by Chairman Sxj- ±j /f^o iii ACKNOY^LEDGLIENTS I wish to express my sincerest thanks to Dr. W, A. Eds on for his invaluable aid and guidance in the problem herein undertaken. I also wish to thank Professor M. A. Honnell for his great assistance in carrying out the experimental study. iv PREPACK: MEANING OF SYMBOLS USED I .....Bessel*s Function of 1st kind, order m, and imaginary argument* G-m Signal electrode to plate transconductance. G_ Conversion transconductance. c E„ ...•Bias of first electrode from cathode. cl E ....Bias of third electrode from cathode. eg.....Total signal electrode voltage. e Total oscillator electrode voltage. W Angular frequency of the oscillator electrode voltage. ..g Angular frequency of signal electrode voltage. a __.•••Angular intermediate frequency. lb i .....Alternating component of plate current. iw ...Alternating component at w__, of plate current. R.•»•*.Amplitude of alternating component of signal voltage. s EQ.....Amplitude of alternating component of oscillator voltage• RT.....Plate load resistance. Li k......Boltzmann,s Constant, Tc Cathode temperature in degrees Kelvin. YQ..«..Input admittance in mho. Af•••.Frequency band width in cycles per second. a n» ^n, C ••••Empirical coefficients of plate family.
    [Show full text]
  • Front-End Receiver: Recent and Emerging Trend Ulrich L
    Front-End Receiver: Recent and Emerging Trend Ulrich L. Rohde Ajay K. Poddar Enrico Rubiola Marius A. Silaghi BTU Cottbus 03046 Germany Synergy Microwave NJ USA FEMTO-ST Inst. Besancon France University of Oradea, Romania Abstract—This paper describes the recent trend of front-end receiver systems for the application in radio monitoring. The 650 MHz to 1300 MHz receiver implementation is optimized for applications such as 20 MHz to 650 MHz hunting and detecting unknown signals, identifying interference, Vin =−117 dBm (0.3 μV) ≥10 dB Vin=−47 dBm (1 mV) ≥50 dB spectrum monitoring and clearance, and signal search over wide LSB/USB, IF bandwidth 500 frequency ranges, producing signal content and direction finding Hz, of identified signals. Δf=500 Hz 0.5 MHz to 20 MHz, ≥10 dB Keywords—Receivers, Real time FFT Processing Vin=0.4μV 20 to 30 MHz, Vin= 0.5 μV ≥10 dB I. INTRODUCTION LSB/USB, IF bandwidth The emerging security threats demand an intensive data 2.5kHz, Δf=1kHz gathering for fiber or radio communication [1]. Besides the 0.5 MHz to 20 MHz, ≥10 dB fiber technology, there are varieties of wireless activities, Vin=0.6μV which are typically analyzed by off the air monitoring [2]-[9]. 20 to 30 MHz, Vin= 0.7 μV ≥10 dB The spectral density of signals these days is very high and Vin= 100 μV ≥46 dB therefore such monitoring receivers require high performance. AM, IF Bandwidth 2.5kHz, The technique in designing such receivers is a composition of fmod=1 kHz, m=0.5 0.5 MHz to 20 MHz, ≥10 dB microwave engineering of the building blocks preamplifier, Vin=1μV mixer, synthesizer and necessary filters, this paper describes 20 to 30 MHz, Vin= 1.2 μV ≥10 dB critical aspects of important building blocks of radio Crossmodulation interfering monitoring receives [10]-[20].
    [Show full text]
  • Master's Thesis
    Eindhoven University of Technology MASTER Mapping a China Digital Radio (CDR) receiver on a software-defined-radio platform Cheng, Y. Award date: 2017 Link to publication Disclaimer This document contains a student thesis (bachelor's or master's), as authored by a student at Eindhoven University of Technology. Student theses are made available in the TU/e repository upon obtaining the required degree. The grade received is not published on the document as presented in the repository. The required complexity or quality of research of student theses may vary by program, and the required minimum study period may vary in duration. General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain Department of Mathematics and Computer Science Algorithm & Software Innovation Mapping a China Digital Radio (CDR) receiver on a Software-Defined-Radio platform Master Thesis Yan Cheng Supervisors: prof.dr.ir.C.H.(Kees) van Berkel Dr.Hong Li Eindhoven, August 2017 Abstract With the launch of the China Digital Radio (CDR) standard in hundreds of cities in China, CDR radio receiver chips are required in market. To explore fast and efficient embedded Software- Defined-Radio (SDR) CDR receiver design and realization, this thesis project used Data-Flow (DF) modeling to study architectural options of a CDR receiver design for an existing NXP SDR chip.
    [Show full text]
  • Multiband LNA Design and RF-Sampling Front-Ends for Flexible Wireless Receivers
    Linköping Studies in Science and Technology Dissertation No. 1036 Multiband LNA Design and RF-Sampling Front-Ends for Flexible Wireless Receivers Stefan Andersson Electronic Devices Department of Electrical Engineering Linköping University, SE-581 83 Linköping, Sweden Linköping 2006 ISBN 91-85523-22-4 ISSN 0345-7524 ii Multiband LNA Design and RF-Sampling Front-Ends for Flexible Wireless Receivers Stefan Andersson ISBN 91-85523-22-4 Copyright c Stefan Andersson, 2006 Linköping Studies in Science and Technology Dissertation No. 1036 ISSN 0345-7524 Electronic Devices Department of Electrical Engineering Linköping University SE-581 83 Linköping Sweden Author e-mail: [email protected] Cover Image Picture by the author illustrating an RF-sampling receiver on block level. The chip microphotograph represents a multiband direct RF-sampling receiver front-end for WLAN fabricated in 0.13 µm CMOS. Printed by LiU-Tryck, Linköping University Linköping, Sweden, 2006 I nådens år 2006! As my grandfather would have said. iii iv Abstract The wireless market is developing very fast today with a steadily increasing num- ber of users all around the world. An increasing number of users and the constant need for higher and higher data rates have led to an increasing number of emerging wireless communication standards. As a result there is a huge demand for flexible and low-cost radio architectures for portable applications. Moving towards multi- standard radio, a high level of integration becomes a necessity and can only be ac- complished by new improved radio architectures and full utilization of technology scaling. Modern nanometer CMOS technologies have the required performance for making high-performance RF circuits together with advanced digital signal processing.
    [Show full text]
  • Facts Worth Knowing About Frequency Converters Preface
    Handbook | VLT® Frequency Converters Facts Worth Knowing about Frequency Converters Preface In 1968, Danfoss was the fi rst company in the world to commence mass production of Frequency Converters, for variable speed control of three-phase induction motors. Today FC’s are an increasingly important component for optimising motor operation, and the system attached to the motor. FC’s are now used in an expanding range of applications, with the following main objectives in mind: • Energy effi ciency optimisation: Converting from fi xed to variable speed in applications with varying load, delivers a step change in energy savings. In fact these days, modern motor technology always requires advanced control in order to run optimally at all speeds. • Factory automation: Continuously escalating demand for factory throughput leading to a higher degree of automation implies a growing need for variable speed solutions. • Process control and optimisation: Improved process control often requires variable speed motor control and leads to more precise control, higher throughput, or comfort, depending on the application. The fundamentals of FC technology persist, but many elements are also rapidly changing. Increasingly, software is embedded in today’s products, off ering new functionalities and enabling the FC to play a larger role in the system. New motor types are appearing, placing additional demands on motor control. This in turn means the FC must be able to control an expanding variety of motor types, without burdening the end user with more complexity. In addition, new energy effi ciency requirements lead to more variable speed applications, eventually making all motors variable speed and controlled by a FC.
    [Show full text]
  • High-Frequency Voltage Measurements
    REPORT CRPL-8-2 ISSUED APRIL 14, 1948 tiona! Bureau of Standards Library, N. W. Bldg. Mm/ , c 1Q/iq U. S. DEPARTMENT OF COMMERCE NOV 1 b 1949 NATIONAL BUREAU OF STANDARDS CENTRAL RADIO PROPAGATION LABORATORY WASHINGTON, D. C. HIGH - FREQUENCY VOLTAGE MEASUREMENTS BY M. C. SELBY Report No, NATIONAL BUREAU OF STANDARDS CRPL-8-2. CENTRAL RADIO PROPAGATION LABORATORY WASHINGTON 25, D. C. HIGH-FREQUENCY VOLTAGE MEASUREMENTS By M, C. Selby Preface This report on r-f measurements contains material written for inclusion in a Handbook of Physical Measurements to be published by the National Bureau of Stand¬ ards . The objectives ares (l) to present an up-to-date conspectus of fundamental techniques used in scientific research, laboratory and commercial measurements as well as their relative merits, (2) to cover all principles and methods that have met with any degree of success but not necessarily to compile all available material in encyclopedical form, (3) to meet the need of the professional worker and graduate student somewhat more comprehensively than the presently available handbooks do, A considerable amount of the material presented is based on work done at this Bureau, Bibliography is omitted because the references given leading in turn to further references and bibliography are considered adequate. Recognition and thanks are due to the authors listed in the references for their kind permission to quote some of these data and reproduce some drawings and curves, as well as to the N. B. S, editorial readers for valuable suggestions and cooperation. Contents Preface List of figures Introductory note 1, Accurate high-precision methods based on d-c measurements (a) Power measurements (b) Current meter and resistance (c) Cathode-ray beam deflection (d) Electrostatic voltmeter 2, Accurate moderate precision methods (a) Vacuum tube voltmeter (b) Non-thermionic rectifiers 3, Pulse-peak voltage measurement (a) Cathode-ray deflection (b) Diode peak voltmeters (o've r) 4.
    [Show full text]
  • Chapter 2 Radio Receiver Characteristics
    Source: Communications Receivers: DSP, Software Radios, and Design Chapter 1 Basic Radio Considerations 1.1 Radio Communications Systems The capability of radio waves to provide almost instantaneous distant communications without interconnecting wires was a major factor in the explosive growth of communica- tions during the 20th century. With the dawn of the 21st century, the future for communi- cations systems seems limitless. The invention of the vacuum tube made radio a practical and affordable communications medium. The replacement of vacuum tubes by transistors and integrated circuits allowed the development of a wealth of complex communications systems, which have become an integral part of our society. The development of digital signal processing (DSP) has added a new dimension to communications, enabling sophis- ticated, secure radio systems at affordable prices. In this book, we review the principles and design of modern single-channel radio receiv- ers for frequencies below approximately 3 GHz. While it is possible to design a receiver to meet specified requirements without knowing the system in which it is to be used, such ig- norance can prove time-consuming and costly when the inevitable need for design compro- mises arises. We strongly urge that the receiver designer take the time to understand thor- oughly the system and the operational environment in which the receiver is to be used. Here we can outline only a few of the wide variety of systems and environments in which radio re- ceivers may be used. Figure 1.1 is a simplified block diagram of a communications system that allows the transfer of information between a source where information is generated and a destination that requires it.
    [Show full text]
  • Radio Receiver Design
    Radio Receiver Design Robert C. Dixon MARCEL DEKKER, INC. Radio Receiver Design ELECTRICAL ENGINEERING AND ELECTRONICS ,4 Series of Reference Books and Textbooks EXECUTIVE EDITORS Marlin 0. Thurston William Midendorf Department of Electrical Engineering Department of Electrical The Ohio State University and Computer Engineering Columbus, Ohio University of Cincinnati Cincinnati. Ohio EDITORIAL BOARD Maurice Bellanger Nairn A. Kheir TClCcommunications, RadioClectriques, Department of Electrical and et TClCphoniques (TRT) Systems Engineering Le Plessis-Robinson, France Oakland University Rochester, Michigan Norman B. Fuqua Reliability Analysis Center Pradeep Khosla Griffiss Air Force Base, New York Carnegie-Mellon University Pittsburgh, Pennsylvania Glenn Zelniker Z-Systems, Inc. Gainesville, Florida 1. Rational Fault Analysis, edited by Richard Saeks and S. R. Liberty 2. Nonparametric Methods in Communications, edited by P. Papantoni- Kazakos and Dimitri Kazakos 3. Interactive Pattern Recognition, Yi-tzuu Chien 4. Solid-state Electronics, Lawrence E. Murr 5. Electronic, Magnetic, and Thermal Properties of Solid Materials, Klaus Schroder 6. Mag netic- Bu b bl e Memory Tec hno1 og y , Hsu Chang 7. Transformer and lnductor Design Handbook, Colonel Wm. T. McL yman 8. Electromagnetics: Classical and Modern Theory and Applications, Samuel Seely and Alexander 0.Poularikas 9. One-Dimensional Digital Signal Processing, Chi- Tsung Chen 10. Interconnected Dynamical Systems, Raymond A. DeCarlo and Richard Saeks 11 Modern Digital Control Systems, Raymond G. Jacquot 12. Hybrid Circuit Design and Manufacture, Roydn D. Jones 13. Magnetic Core Selection for Transformers and Inductors: A User's Guide to Practice and Specification, Colonel Wm. T. McLyman 1 4. Static ar\d Rotating Electromagnetic Devices, Richard H. Engelmann 1 5.
    [Show full text]
  • General-Purpose Inverter Technologies Inverter User’S Success Stories Nowadays, Fuji Electric Inverters Are Indispensable to Your Systems
    Whole Number 182 General-Purpose Inverter Technologies Inverter user’s success stories Nowadays, Fuji Electric Inverters are indispensable to your systems. Research laboratory equipment We are assured of precise control Commercial-use washing machines with these inverters. Even with the large volumes of wash, our machines can start up Automated parking garage powerfully. Our powerful inverters enable vehicles to be lifted very smoothly. Rotary press for printing machine The inverter assures stable, high-speed operation of the machine. Warehouse conveyor system Our heavy cargo is conveyed Mini-conveyor system smoothly. The key is using inverters. It doesn’t matter how much fish I load on the conveyor, it always carries them smoothly. Sushi-serving rotary conveyor system Our compact and easy-to-operate inverters are also at work here. FVR-E9S FRENIC5000P9S FVR-C9S FRENIC5000G9S series series series series Fuji Electric can provide you with the products best suited to meet your requirements. The torque-vector-control type FRENIC5000G9S series is For mini-conveyors and ventilation fans, use the FVR-C9S ideal for use in washing machines for commercial use and series which offers you simplified operation and low cost. automated parking garages. Fuji Electric can supply you with inverters conforming with the The FRENIC5000P9S series is best suited for variable-speed EN Standards, UL Standards and/or the cUL Standards. applications such as fans, and pumps. The FVR-E9S series featuring high environmental protection performance is suitable for
    [Show full text]
  • Wide Frequency Range Superheterodyne Receiver Design and Simulation
    Wide Frequency Range Superheterodyne Receiver Design and Simulation Chen-Yu Hsieh A Thesis In The Department of Electrical and Computer Engineering Presented in Partial Fulfillment of the Requirements For the Degree of Master of Applied Science at Concordia University Montreal, Quebec, Canada January 2011 © Chen-Yu Hsieh, 2011 CONCORDIA UNIVERSITY SCHOOL OF GRADUATE STUDIES This is to certify that the thesis prepared By: Chen-Yu Hsieh Entitled: “Wide Frequency Range Superheterodyne Receiver Design and Simulation” and submitted in partial fulfillment of the requirements for the degree of Master of Applied Science Complies with the regulations of this University and meets the accepted standards with respect to originality and quality. Signed by the final examining committee: ________________________________________________ Chair Dr. D. Qiu ________________________________________________ Examiner, External Dr. Y. Zeng, CIISE To the Program ________________________________________________ Examiner Dr. A. K. Elhakeem ________________________________________________ Supervisor Dr. Y. R. Shayan Approved by: ___________________________________________ Dr. W. E. Lynch, Chair Department of Electrical and Computer Engineering ____________20_____ ___________________________________ Dr. Robin A. L. Drew Dean, Faculty of Engineering and Computer Science ii Abstract Wide Frequency Range Superheterodyne Receiver Design and Simulation Chen-Yu Hsieh The receiver is the backbone of modern communication devices. The primary purpose of a reliable receiver is to recover the desired signal from a wide spectrum of transmitted sources. A general radio receiver usually consists of two parts, the radio frequency (RF) front-end and the demodulator. RF front-end receiver is roughly defined as the entire segment until the analog-to-digital converter (ADC) placed before digital demodulation. Theoretically, a radio receiver must be able to accommodate several tradeoffs such as spectral efficiency, low noise figure (NF), low power consumption, and high power gain.
    [Show full text]