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Semiconductors / Integrated Circuits

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 Āµ 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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Fibercom Clock Timing - A Review of PLL Solutions

Presentation of the emergence of photonic timing devices using phase-locked loops (PLL) for signal generation with challenges in jitter performance, size, power and cost
Bar-Giora Goldberg
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Tutorial Fibercom Clock Timing - A Review of PLL Solutions Bar-Giora Goldberg Peregrine Semiconductor Corp. San Diego, CA The fiber optics telecommunications market (called here photonics) has experienced huge growth in the last few years. Being a two-level digital transmission format, the requirements for clocking, timing, retiming and sometimes...
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An EM Simulator for MEMS and Real Life MMICs

Introduction to a low cost software package used to address the 3D EM analysis of structures involving complex substrates as encountered in common MMIC design
MEM Research
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Product Feature An EM Simulator for MEMS and Real Life MMICs MEM Research Spoltore, Pescara, Italy Generally speaking, there are two large families of commercially available electromagnetic (EM) solvers. The first one is a general-purpose set, covering the analysis of arbitrarily shaped structures and using finite elements or differences,...
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System-level Filter Design Methodology for WLAN-OFDM Transceivers

Presentation of system-level filter design methodology to efficiently constrain the implementation loss and complexity of a digital orthogonal frequency division multiplex (OFDM) transceiver
B. Debaillie, B. Come, W. Eberle, S. Donnay and H. Minami
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Technical Feature System-level Filter Design Methodology for WLAN-OFDM Transceivers Orthogonal frequency division multiplex (OFDM)-based WLAN standards target wireless communications in the 5 GHz band for consumer multimedia applications. Digital OFDM transceiver ICs, based on frequency domain equalization, have been presented. However, it is still a challenge to design a...
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A New Planar Coupled-line Balun for Microwave Applications

Presentation of a simple and effective way to relax the narrow spacing requirement between coupled lines in conventional planar Marchand baluns
Jwo-Shiun Sun and Guan-Yu Chen
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Technical Note A New Planar Coupled-line Balun for Microwave Applications This article presents a novel inward collateral coupled-line balun. The new design provides an effective and simple way to avoid the narrow line spacing used in conventional planar Marchand baluns. A new structure with l /4 collateral coupled-lines has...
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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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Monolithic RF Matrix Switches

Introduction to a new line of fully monolithic RF matrix switches for cellular infrastructure applications
Peregrine Semiconductor Corp.
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Product Feature Monolithic RF Matrix Switches Peregrine Semiconductor Corp. San Diego, CA A new line of fully monolithic 4 x 6 RF matrix switches for cellular infrastructure applications has been introduced. The parts feature low insertion loss, very high port-to-port isolation and serial programmability. These designs represent the state-of-the-art...
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A Low Cost Oscillator for Fiber-optic Applications

Introduction to a new oscillator for use in synchronous optical network applications
TRAK Microwave Corp.
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Product Feature A Low Cost Oscillator for Fiber-optic Applications A new, low cost oscillator has been introduced for use in synchronous optical network (SONET/SDH) OC-192 applications. The new frequency source utilizes an ultra-low noise active device technology that allows the oscillator to achieve very low overall phase noise performance....
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Temperature Variable Attentuator for Millimeter-wave Applications

A temperature variable attenuator designed for millimeter-wave applications is featured
EMC Technology Inc.
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Cover Feature Temperature Variable Attenuator for Millimeter-wave Applications EMC Technology Inc. Cherry Hill, NJ The ThermopadĀ® temperature variable attenuator (TVA) has gained widespread popularity among RF and microwave circuit designers as a simple solution to compensate gain variation over temperature. The TVA is a special case of the absorptive...
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