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Amplifiers

A Broadband Hybrid Solid-state and TWT Amplifier

Development of a broadband microwave amplifier for testing in the 800 MHz to 18 GHz frequency range
Amplifier Research
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Test applications that require microwave power from 1 to 18 GHz are usually addressed by two amplifiers, a solid-state unit to cover the low frequency range and a traveling-wave tube amplifier (TWTA) for the higher range. The input signal must be switched between the two amplifiers and, if there...
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Research@mwjournal.com

<I>Microwave Journal</I>'s second annual overview of microwave technology research projects currently being investigated by European academic institutions and commercial organizations
Richard Mumford, Microwave Journal European Editor
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Today's investment in and commitment to meaningful, commercially viable research will determine the shape and prosperity of tomorrow's microwave industry. Following its introduction in 2001 the second Microwave Journal guide to European research projects highlights the studies being undertaken by academic and commercial establishments to develop the innovations that...
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Design of a Generic 2.5 W, 60 Percent Bandwidth, C-band MMIC Amplifier

Description of the design and test data of a generic 2.5 W, two-stage, C-band MMIC power amplifier
Inder J. Bahl, M/A-COM Inc.
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During the past decade, there has been significant progress in monolithic power amplifiers operating at RF and microwave frequencies over narrow and broadbands for both commercial and military applications. For numerous applications, including handsets, VSAT and transmit/receive modules, these amplifiers are produced in large quantities using MESFET, HBT and...
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Low Cost Millimeter-wave Packaged MMICs

A surface-mount device-packaged MMIC chipset for 26 GHz point-to-point and point-to-multipoint radio links is featured
United Monolithic Semiconductors S.A.S.
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Cover Feature Low Cost Millimeter-wave Packaged MMICs United Monolithic Semiconductors S.A.S. Orsay Cedex, France Millimeter-wave technology is being recognized as having potential for emerging markets, such as broadband radio links for cellular base station backhaul networking and automotive safety systems. For such development to occur, however, the requested volumes...
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LDMOS Linearity and Reliability

Introduction to a self-aligned shadow isolated LDMOS device designed to improve linearity and reliability
Jed Rice
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Technical Features LDMOS Linearity and Reliability Laterally diffused metal-oxide-semiconductor (LDMOS) devices have been available as high power, low frequency amplifiers for almost three decades. The original devices had problems with linearity and reliability. More recent developments have improved the device performance and make LDMOS suitable in cellular base station...
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Q- and V-band MMIC Low Noise Amplifiers

Demonstration of a design method for Q- and V-band low noise amplifiers based on a distributed pHEMT model and exact simulation
Byung-Jun Jang, In-Bok Yom and Seong-Pal Lee
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Technical Feature Q- and V-band MMIC Low Noise Amplifiers This article describes MMIC low noise amplifiers for millimeter-wave applications using 0.15 µ m pHEMT technology. The design emphasis is on the active device model. The deficiency of conventional device models is identified. A distributed device model has been adapted...
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Gain for Compressed Amplifiers

Examination of two approaches to the concept of gain, differential and ratiometric in compressed amplifiers
Earl McCune
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Tutorial Gain for Compressed Amplifiers There is growing interest in operating amplifiers into compression to achieve higher power-conversion efficiencies. It becomes constructive then to revisit the concept of amplifier gain, because when an amplifier operates in compression the general assumption that the output signal is directly proportional to the...
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A Distributed Amplifier for 40 Gbps Fiber-optic Communications Systems

Description of a distributed amplifier for a LiNbO<sub>3</sub> modulator driver using double-doped AlGaAs/AlGaAs pseudomorphic HEMTs
H. Shigematsu, M. Sato, T. Hirose and Y. Watanabe
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Technical Feature A Distributed Amplifier for 40 Gbps Fiber-optic Communications Systems H. Shigematsu, M. Sato, T. Hirose and Y. Watanabe Fujitsu Laboratories Ltd. Atsugi, Japan In recent years, the rapid development of multimedia communications has generated a strong demand for high speed and high capacity transmission systems. Wavelength-division multiplexing...
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Design of a Predistortive High Power Amplifier Using Carrier Complex Power Series Analysis

Introduction to a new carrier complex power series for linearizing the distortion effects of a high power amplifier
Yong-Chae Jeong and Sang-Young Yun
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Technical Feature Design of a Predistortive High Power Amplifier Using Carrier Complex Power Series Analysis In this article, a new carrier complex power series for linearizing the distortion effects of a high power amplifier (HPA) is proposed. The amplitude (AM-to-AM) and phase (AM-to-PM) nonlinear characteristics of the HPA are...
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WCDMA Application of Gain Blocks

Description of the detailed operating characteristics of InGaP HBT gain block products that are widely used in 2G, 2.5G and 3G applications
EiC Corp.
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Product Feature WCDMA Application of Gain Blocks EiC Corp. Fremont, CA This article deals with the detailed operating characteristics of InGaP HBT gain block products that are widely used in 2G, 2.5G and 3G applications, using 3G WCDMA as the example. The linearity, expressed by adjacent channel leakage ratio...
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