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Industry News

Orthogonal Frequency Division Multiplex Overview

Explanation of the improvement gained by applying space diversity techniques to the orthogonal frequency division multiplex system in a multipath fading environment
Ali Zamanian
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Technical Feature Orthogonal Frequency Division Multiplex Overview Ali Zamanian Fluor Corp. Wireless broadband, also called wireless cable, was developed to provide local access to small business and residential users for the delivery of high quality digital data, video and voice services. Orthogonal frequency division multiplex (OFDM) is a modulation...
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Regrowth of Data Spectral Sidelobes from AM/PM Effects and Hard Limiting

Framework for analyzing and predicting the power spectral sidelobe regrowth from soft saturating amplification of data signals having small percentage carrier ripple
Frank Amoroso
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Technical Feature Regrowth of Data Spectral Sidelobes from AM/PM Effects and Hard Limiting Frank Amoroso Santa Ana, CA A previous article 1 set forth a framework for analyzing and predicting the power spectral sidelobe regrowth from soft saturating amplification of data signals having small percentage carrier ripple. The results...
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Design of a Low Phase Noise Ku-band Oscillator Using a SiGe HBT

Presentation of the characteristics of a commercially available SiGe heterojunction bipolar transistor used in an oscillator operating at Ku-band
Myrianne Regis, Hugues Lafontaine, Steve Kovacic, Gilles Cibiel, Olivier Llopis
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Technical Feature Design of a Low Phase Noise Ku-band Oscillator Using a SiGe HBT Myrianne Regis, Hugues Lafontaine and Steve Kovacic SiGe Semiconductor Ottawa, ON, Canada Gilles Cibiel and Olivier Llopis LAAS-CNRS Toulouse, France In the past decade, the demand for microwave, millimeter-wave and wireless communication systems has rapidly...
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Lossy Linearizers for Reduction of Nonlinear Distortion

Description of a technique used for reducing distortion components in nonlinear electronic or electro-optic devices
Somnath Mukherjee, Mridul K. Pal, Ralph Inducta
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Technical Feature Lossy Linearizers for Reduction of Nonlinear Distortion This article describes a technique for reducing distortion components in nonlinear electronic or electro-optic devices. The linearizer circuits are capable of generating both even- or odd-order distortion, or any combination thereof. Both compressive (180°) and expansive (0°) nonlinearity can be...
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Design of a Novel Vector Modulator

Introduction to a vector modulator that controls magnitude and phase of an input signal
Yong-Chae Jeong
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Technical Feature Design of a Novel Vector Modulator A vector modulator that controls magnitude and phase of an input signal is proposed in this article. The previous magnitude and phase-controlling circuits, composed of an attenuator and a phase shifter, permit phase and gain cross-coupling. The proposed modulator, which is...
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Linearity Requirements for MMICs for 16 Through 128 QAM ETSI Compliant Radios

Introduction to the regulatory and operational issues which influence linearity requirements and frequency planning aspects of high frequency microwave radios used for point-to-point or point-to-multipoint systems
Jim Harvey
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Special Report Linearity Requirements for MMICs for 16 Through 128 QAM ETSI Compliant Radios Jim Harvey Mimix Broadband Webster, TX This article highlights some of the regulatory and operational issues that influence linearity requirements and frequency planning aspects of high frequency microwave radios used for point-to-point or point-to-multipoint systems....
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RAWCON2001 Conference Report

A recap of the 2001 IEEE Radio and Wireless Conference held August 19 to 22 in Waltham, MA
Michael S. Heutmaker
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Special Report RAWCON2001 Conference Report RAWCON2001 Highlights Interdisciplinary Wireless Data Technology Michael S. Heutmaker RAWCON2001 General Chair The 2001 IEEE Radio and Wireless Conference (RAWCON2001), held in Waltham, MA, on August 19 to 22, 2001, explored interdisciplinary aspects of RF technology and wireless communications. This year several elements of...
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Fractional-N Synthesizers

Description of fractional-N synthesizers and the associated systems used to implement the technology in commercially available products
David Owen
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Technical Feature Fractional-N Synthesizers David Owen IFR Systems Inc. Wichita, KS Fig. 1 A basic fractional-N system with no jitter correction based on a single accumulator. Fractional-N synthesizers have been used for many years to improve the performance of indirect frequency synthesizers. A simple indirect synthesizer consists of a...
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New Products

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New Products COMPONENTS Digital Attenuators The model AA107-310 and AA109-310 GaAs IC five-big digital attenuators feature serial to parallel silicon drivers as well as low loss, high attenuator accuracy and high IP3. The attenuators are designed for use in basestations, wireless data and wireless local loop applications. The AA107-310...
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Around the Circuit

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Around the Circuit INDUSTRY NEWS National Starch and Chemical , a member of the ICI Group , has acquired selected product line and technologies from the Advanced Polymers Business of Honeywell International Inc. Terms were not disclosed. Allgon AB has reached an agreement with National Semiconductor Corp. (NSC) whereby...
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