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Application Note The Evolving Wireless Standards poster and application note are based on IEEE 802.16e mobile WiMAX. As a quick reference guide, the wireless poster highlights a range of information on the latest cellular and wireless connectivity technologies and applications. The “IEEE 802.16e WiMAX OFDMA Signal Measurements and Troubleshooting”...
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An Eight-element 6 to 18 GHz SiGe BiCMOS RFIC Phased-array Receiver

The University of California at San Diego (UCSD) recently developed a silicon RFIC covering the 6 to 18 GHz frequency range that is capable of controlling the phase and gain of eight elements in a phased-array receiver. The chip is only 2.3 x 2.4 mm, c...
Phased arrays allow the electronic steering of an antenna beam in any direction and with high antenna gain by controlling the phase at each antenna element. This beam steering technique is much more compact and much faster than mechanically steered arrays. Furthermore, phased arrays allow the creation of deep...
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AR RF Microwave Instrumentation Completes $2.2 M Building Expansion

A new 15,000 sq. ft. building has been completed at the site of <B>AR</B>'s worldwide headquarters in Souderton, PA.
A new 15,000 sq. ft. building has been completed at the site of AR 's worldwide headquarters in Souderton, PA. The three-story building houses the accounting department, customer service and a new machine shop on the first floor; expanded production facilities on the second floor; and a meeting room...
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Anite and Beceem Announce WiMAX™ Collaboration

Anite</B>, a leader in testing technology for the wireless industry, and <B>Beceem Communications Inc.</B>, a leading provider of chipsets for the mobile broadband market, announced that they have entered into a collaboration to enable customers to mor...
Anite , a leader in testing technology for the wireless industry, and Beceem Communications Inc. , a leading provider of chipsets for the mobile broadband market, announced that they have entered into a collaboration to enable customers to more effectively use their respective products. The collaboration is built upon...
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COMSOL Becomes SolidWorks Solution Partner

SolidWorks Corp.</B>, a leader in 3D CAD technology, and <B>COMSOL</B>, a worldwide leader in multiphysics simulation software, have strengthened their ties: SolidWorks has named COMSOL as one of its select Solution Partners.
SolidWorks Corp. , a leader in 3D CAD technology, and COMSOL , a worldwide leader in multiphysics simulation software, have strengthened their ties: SolidWorks has named COMSOL as one of its select Solution Partners. This program provides SolidWorks users with access to integrated products and services that can further...
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Efficiency Comparison of a Digitally Predistorted and a Feed-forward Linearized Doherty Amplifier with Crest Factor Reduction

This article provides a direct performance comparison between a Doherty digital predistorted (DPD) amplifier and a Doherty feed-forward linearized power amplifier (DFFLPA) under various crest factor reduction levels. Based on experimental results at an...
The increasing importance of spectral efficiency in mobile communication services, such as wideband code division multiple access (WCDMA) and orthogonal frequency division multiplexing (OFDM), has resulted in a fluctuating signal envelope. The large peak-to-average power ratio (PAPR) of these modulations requires base station power amplifiers to have a high...
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An Adaptive Baseband Digital Predistortion System for an RF Power Amplifier

In this article, a baseband digital predistortion (DPD) radio frequency (RF) power amplifier (PA), based on the complex gain compensation and adaptive algorithm, is investigated. First, the nonlinear characters of the power amplifier are described. Nex...
With the rapid growth of modern wireless communication technologies and markets, higher spectrum efficiency is required for higher data rates and larger capacity. As a result, high order digital modulations with high peak-to-average ratio are usually adopted to meet these requirements. Therefore, the dynamic range and linearity of the...
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100 W GaN HEMT Modeling

Recent improvements in GaN HEMT device technology have enabled unprecedented power levels for solid-state amplification. Devices are now capable of exceeding 100 W in a single package.<sup>1</sup> The need for accurate models for these devices has beco...
GaN devices now operate at much higher bias conditions than traditional PHEMTs or HBTs, and also dissipate DC power and generate RF power at much higher densities. Due to high RF and DC power levels, it was found that conventional CW device characterization and modeling techniques are no longer...
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