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Industry News

Workshops & Courses

April 1, 2001
WORKSHOPS & COURSES Emerging IT Technologies: An Enterprise-focused Vision * Topics: ERP and supply chain management, data warehouse and data mining, decision support systems and artificial intelligence, e-commerce, extranets/intranets, events calendaring, work flow, program management and risk management. Fee: $1495. * Site: Pasadena, CA * Dates: May 8­11, 2001...
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A Linear LDMOS Amplifier for 3GPP Applications

An introduction to BLF2022-90, a single-ended 90W N-channel linear base station amplifier
March 1, 2001
PRODUCT FEATURE A Linear LDMOS Amplifier for 3GPP Applications Philips Semiconductor Foxboro, MA W ith the introduction of digital modulation formats and the trend towards multi-carrier amplifiers, base station power amplifiers require the use of transistors with high peak power capability. The amplifier is required to meet stringent linearity...
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A 2.7 GHz RF/IF Gain and Phase Detector

A new gain/phase detector used to measure the gain ratio and phase difference between two signals
March 1, 2001
PRODUCT FEATURE A 2.7 GHz RF/IF Gain and Phase Detector Analog Devices Inc. Norwood, MA G ain and phase are fundamental properties of all radio systems. The need to measure these parameters is exemplified through the ubiquitous use of vector analyzers. The AD8302 gain/phase detector integrated circuit was developed...
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A New Approach to Wireless Propagation Prediction

The development of a new propagation and prediction software tool called Wireless InSite
March 1, 2001
PRODUCT FEATURE A New Approach to Wireless Propagation Prediction Remcom Inc. State College, PA Fig. 1 Three-dimensional orthographic view of downtown Rosslyn, VA showing transmitter antenna locations and field strength along the receiver routes. A software tool has been developed that provides accurate, site-specific radio signal predictions for urban...
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Low Cost Antenna Measurement Systems

A series of user-friendly, accurate and cost-effective antenna pattern measurement systems
March 1, 2001
PRODUCT FEATURE Low Cost Antenna Measurement Systems HVS Technologies Inc. State College, PA Fig. 1 The new HVS antenna measurement system.  A new family of low cost systems for antenna pattern measurements has been developed. These systems, shown in Figure 1, come with complete hardware and user-friendly software for...
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CAD of a Compact Monopulse Comparator Network Using Planar Magic Tee Junctions for Airborne Slotted Array Antennas

Development and use of planar magic tee junctions for airborne slotted array applications
March 1, 2001
TECHNICAL FEATURE CAD of a Compact Monopulse Comparator Network Using Planar Magic Tee Junctions for Airborne Slotted Array Antennas The operating principle and design of compact, non-standard, reduced height waveguide planar magic tee junctions are described. The distinguishing feature of these components is the placement of the difference port...
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Thermal Modeling of Heterojunction Bipolar Transistors with Pulsed I-V Measurements

An extraction procedure for thermal parameters of high power heterojunction bipolar transitors with pulsed I-V measurements
March 1, 2001
TECHNICAL FEATURE Thermal Modeling of Heterojunction Bipolar Transistors with Pulsed I-V Measurements An extraction procedure for thermal parameters of high power heterojunction bipolar transistors (HBT) with pulsed I-V measurements is presented. The pulsed measurements become essential to model thermal effect and frequency dispersion of high frequency devices. The measurement...
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A Four-port Microwave Measurement System to Speed On-wafer Calibration and Test

Description of a new multiport calibration technique utilizing a four-port wafer-probe system
March 1, 2001
TECHNICAL FEATURE A Four-port Microwave Measurement System to Speed On-wafer Calibration and Test A four-port measurement system comprising an inexpensive coaxial switch matrix and a comprehensive free software package extends the capabilities of a user's two-port automatic network analyzer and probe station to three- and four-port measurements. The software...
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Exploiting Filter Symmetry

The manifestation of physical and response symmetry in electric-wave filters
March 1, 2001
TECHNICAL FEATURE Exploiting Filter Symmetry Randall W. Rhea Eagleware Corp. Norcross, GA S ymmetry is an element of beauty. Besides it's esthetic appeal, symmetry is practical. Symmetry has two important manifestations in electric-wave filters: symmetry with respect to element values mirrored about the input and output (physical symmetry) and...
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Nyquist Quadrature Frequency Shift Keying for Spectral Efficiency

In-depth discussion of NQFSK, a constant carrier output modulation format with excellent spectral containment
March 1, 2001
TECHNICAL FEATURE Nyquist Quadrature Frequency Shift Keying for Spectral Efficiency Frank Amoroso Santa Ana, CA T he selection of a data modulation scheme for radio transmission usually involves a trade among a number of parameters, including communications efficiency (bit error rate (BER) vs. signal-to-noise ratio), bandwidth efficiency and factors...
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