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Industry News

The Commercial Market

The Commercial Market Bluetooth to Ramp Up in Market Outside of Mobile Handsets While mobile handsets are expected to account for approximately two-thirds of the Bluetooth devices that will ship in 2002, and cordless headsets will also be a growing category, Allied Business Intelligence's (ABI) new Bluetooth report notes...
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The Book End

Wireless Communications - Principles and Practice, Second Edition Theodore S. Rappaport Prentice Hall PTR 707 pages; $92 ISBN: 0-13-042232-0 The second edition of this book has been written to initiate the newcomer to wireless personal communications, one of the fastest growing fields in the engineering world. Technical concepts which...
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RF/Microwave Manipulators for Precise Test Probe Measurements

In today's fast paced semiconductor industry making accurate and reliable measurements at microwave frequencies is critical to successful product development operations. Microwave measurements enable engineers to characterize both the linear and nonlinear behavior of devices, providing critical performance information. Precise probe contact is a necessity to obtain accurate test...
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New Substrate Technology for High Performance Circuits and Systems

A new substrate technology has been developed that addresses the dense component placement, high heat dissipation, harsh environments and high frequencies associated with high performance devices such as microwave amplifiers for base stations, broadband amplifiers designed into multi-media networks, and high power microwave power combiners with on-board terminations. The...
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A Minimalist Approach to Feedforward Multi-carrier Linear Power Amplifiers

A feedforward multi-carrier linear power amplifier with 60 W maximum average output is featured
Atmospheric propagation attenuation is known to be higher in the 2.1 GHz band than in the cellular band. Thus, to overcome this performance disadvantage and to maximize cell coverage and capacity, Unity Wireless System's first feedforward multi-carrier linear power amplifier (MCLPA) product has been designed with a high 60...
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A Fully-integrated 5 GHz 0.18 µm CMOS VCO for 802.11a WLAN Applications

This article presents a fully-integrated 5 GHz CMOS voltage-controlled oscillator (VCO) for a U-NII band 802.11a WLAN application. The VCO core circuit uses only PMOS fabricated with the 0.18 mm 1P6M standard CMOS process to obtain better phase noise p...
Due to the fast growing demand for broadband wireless communications, the operating frequency is moving toward the 5 GHz U-NII band. With a maximum data rate of 54 Mbps, the IEEE 802.11a wireless LAN (WLAN) standard specifies a 300 MHz allocation of spectrum in the 5 GHz range that...
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Understanding W-CDMA Modulation Quality Measurements

There are many ways of characterizing W-CDMA transmitter performance. However, the Third Generation Partnership Project (3GPP) specifications require two measurements to verify the in-channel modulation quality of W-CDMA transmitters - error vector magnitude (EVM) and peak code domain power (peak CDE). This article explores the purpose behind these key...
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2002 Editorial Index

ANTENNAS Chuang, Huey-Ru, Liang-Chen Kuo, Chi-Chang Lin and Wen-Tzu Chen "A 2.4 GHz Polarization-diversity Planar Printed Dipole Antenna for WLAN and Wireless Communication Applications," No. 6, p. 50. Gunnels, Robert "Axial Ratio Measurements of Single Circularly Polarized Antennas," No. 1, p. 124. Izadian, Jamal S. "QFHA Antennas for Satellite...
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High Efficiency Class B, E and F Power Amplifiers: The Magic of Parallel Circuits

Modern commercial and military communication systems require high efficiency, long term operating conditions. For this purpose, the power amplifiers, as final and highly current-consuming transmitter elements, are developed using the high efficiency class B, F or E modes of operation, depending on the technical requirements. In class B operation,...
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A Measurement-based Behavioral Model for I/Q RF Modulators

This article describes a nonlinear behavioral modeling technique for application to I/Q modulated communication channels. The model data was gathered by independent measurements of an I/Q modulator and amplifier, using vector signal generators and anal...
The W-CDMA standard expresses transmit quality in terms of EVM and ACLR, and receive quality in bit error ratio (BER). These quality measurements are simple scalar numbers representing a very complicated system. Modern communications channels (still) consist of a number of concatenated functions such as baseband (BB) processor, DAC,...
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