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Microwave Magazine, IEEE

Issue 7 • Date Dec. 2009

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Displaying Results 1 - 25 of 31
  • IEEE Microwave Magazine - Front cover

    Page(s): C1
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    Freely Available from IEEE
  • Table of contents

    Page(s): 3 - 4
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  • Let's have some fun [From the Editor's Desk]

    Page(s): 6
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  • Inspiring future engineers and scientists [President's column]

    Page(s): x2
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  • Power amplifiers in advanced technology [From the Guest Editor's Desk]

    Page(s): 24 - 26
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  • Cancer and the environment [Microwave Surfing]

    Page(s): 28 - 28, 101
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  • Bessel waives [Microwave Bytes]

    Page(s): 30 - 117
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (760 KB) |  | HTML iconHTML  

    The paper discussed the definition and difference between phase modulation and frequency modulation given the equation and the connection of frequency modulation to power amplifier theory. View full abstract»

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  • Vacuum tube amplifiers

    Page(s): 38 - 51
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4966 KB) |  | HTML iconHTML  

    This article gives a brief overview of the common vacuum electronic tube amplifiers used in high-power transmitters. Only three types of devices [travelling wave tubes (TWTs) including helix and coupled-cavity types, microwave power modules (MPMs), and klystrons] are covered, with emphasis on the recent advance in the millimeter-wave band. View full abstract»

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  • Behavioral modeling and predistortion

    Page(s): 52 - 64
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3570 KB) |  | HTML iconHTML  

    In this article, a thorough overview of behavioral modeling and predistortion of dynamic nonlinearities in RF PAs and transmitters was presented. The sensitivity of the DUT behavior to the characteristics of the stimulus was reviewed to ensure appropriate conditions for accurate observation. Nearly all state-of-the-art behavioral models were described and their relative performance and complexity discussed. Similarities and specifics of behavioral modeling and digital predistortion were presented. Thereby, digital predistortion can be seen as a behavioral modeling problem for which performance assessment is much more straightforward. For DUT behavioral modeling, there is no comprehensive metric that allows the model performance evaluation while taking into account the model accuracy in predicting all the three components of the DUT behavior (in-band distortion, static nonlinearity and memory effects). Finally, a software digital predistortion solution that enables closed-loop wideband linearization was briefly presented with excellent linearization capabilities when amplifying a 12-carrier 60-MHZ wide WCDMA signal. View full abstract»

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  • Practical waveform engineering

    Page(s): 65 - 76
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2070 KB) |  | HTML iconHTML  

    RF I-V waveform measurement and engineering systems are now finally enabling practical waveform engineering to be directly undertaken with systems capable of supporting continuous wave stimulus reaching a high level of maturity. On-going research and development activities are presently addressing the multitone requirement. The availability of RF I-V measurement and engineering capability extends the characterization opportunities for both high-frequency/speed transistor technology developers and circuit/system designers; terminal waveforms are the unifying theoretical link between transistor technology, circuit design, and system performance. Design support can involve the direct utilization of such a measurement system in the design investigation/evaluation loop of either power transistor technology or PAs. This eliminates the black box design processes and allows for the development of new intelligent design processes that are completely founded on theoretical waveform analysis. Alternatively, it can also indirectly support the amplifier investigation/evaluation loop by supporting the development or improving the accuracy of nonlinear transistor models or by providing CAD-accessible behavioral or behavioral model parameter datasets. W can now only hope that, triggered by the availability of RF waveform measurement and engineering systems, we will see a renaissance in theoretical waveform mathematical analysis addressing not only power and efficiency but also design sensitivity and linearity. View full abstract»

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  • Linear power and efficiency at microwave and millimeter-wave using twta based microwave power modules [Application notes]

    Page(s): 78 - 89
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (6088 KB) |  | HTML iconHTML  

    The results in this article clearly indicate the importance of millimeter-wave power module (MPM) technology and illustrate the enormous value of combining an MPM with a linearizer. This combination makes linearized MPMs highly attractive for commercial and government communications applications. A linearized-MPM can provide significantly higher power and efficiency for a comparable linearity in a lighter weight and more compact package than alternate options. The linearizer allows an MPM to provide four times the output power for many linear applications, and more than a 10 dB improvement in two-carrier linearity over much of its power range. For currently available MPMs, linearization allows operation with common digital modulations with a spectral regrowth of greater than 30 dB at an output power of 50 W with an overall efficiency of 25%. Even greater benefits are provided for complex digitally modulated signals as wideband code division multiple access (WCDMA). This MPM can be housed in an 820 cubic cm volume, 2.3 kg in weight and allows operation over multi-octave bandwidths. View full abstract»

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  • High Frequency and Microwave Circuit Design (Nelson, C.; 2008) [Book Review]

    Page(s): 90 - 92
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  • Fundamentals of High Frequency Analog CMOS Analog Integrated Circuits (Leblebici, D. and Leblebici, Y.) [Book Review]

    Page(s): 92
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  • Recently published books

    Page(s): 94
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  • MTT-S awards 22 fellowships to promising students in microwave engineering [Education News]

    Page(s): 96 - 100
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  • Technical coordinating committee [TCC tidbids]

    Page(s): 102
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  • Member and geographic activities (MGA) committee report [Around the globe]

    Page(s): 104 - 108
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  • MTT-S Ombudsman

    Page(s): 112 - 113
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  • Microwave new products [New Products]

    Page(s): 114 - 117
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  • Conference calendar

    Page(s): 118
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  • Year end index

    Page(s): 120 - 130
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  • RF Power Amplifiers Feature in IMS2009 Student Paper Prize

    Page(s): 26
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  • ARFTG 75th Microwave Measurement Conference - call for papers

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  • IMS2010

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Aims & Scope

IEEE Microwave Magazine is intended to serve primarily as a source of information of interest to professionals in the field of microwave theory and techniques.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
John Wood
Maxim Integrated Products, Inc.

San Jose, CA      USA
john.wood@ieee.org
Phone:+1 480 577 0927