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Subsystems and Systems

A Compact W-CDMA RF Front End

Introduction to a complete RF front end assembly that meets environmental requirements for base station service
July 1, 2002
As the environments in which cell sites are located becomes more constricted, designers of base stations for third-generation networks are faced with challenges such as increased functional integration and other size-reduction techniques similar to those of their mobile phone counterparts. The model FEU-WCDMA1 is a W-CDMA RF front end...
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QFHA Antennas for Satellite Radio and Mobile Phone Applications

Presentation of a specific quadrifilar helical antenna design for satellite radios, along with a planar design for an integrated BFN90 beam forming network
July 1, 2002
Quadrifilar helical antennas (QFHA) are one of the best candidates to provide a high gain, shaped beam with excellent circular polarization axial ratio for satellite radio and mobile satellite phone systems. One of the most compelling reasons to use these antennas for digital radio and mobile satellite systems is...
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The Use of Intermodulation Tables for Mixer Simulations

Use of intermodulation table files to accurately predict the output frequency content of an up-converting or down-converting mixer in system simulations
April 1, 2002
Technical Feature The Use of Intermodulation Tables for Mixer Simulations The use of intermodulation table (IMT) files can lead to accurate prediction of the output frequency content of an up-converting or down-converting mixer in system simulations. For best results, custom IMT files should be constructed from mixer output spectrum...
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A Portable Base Station Installation and Commissioning Test System

Introduction to a base transceiver station test system capable of providing adaptable on-site testing for the verification of transmit and receive paths of base stations
March 1, 2002
Product Feature A Portable Base Station Installation and Commissioning Test System Racal Instruments Limited Slough, UK Testing in the field puts singular rigorous demands on both the engineer and test equipment used, with the installation and commissioning of field installed base stations presenting particular challenges. Specific considerations include being...
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A Complete Spectral System Analysis for RF/Microwave Engineers

A new spectral domain system simulator is featured
March 1, 2002
Cover Feature A Complete Spectral System Analysis for RF/Microwave Engineers Eagleware Corp. Norcross, GA Historically, RF and microwave system designers have been forced to resort to a hodgepodge of commercial and custom-written software to characterize and simulate the frequency-domain behavior of complex RF systems and subsystems. This approach tends...
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Measurement of On-wafer Transistor Noise Parameters Without a Tuner Using Unrestricted Noise Sources

Presentation of a method for calibrating the four noise parameters of a noise receiver that does not require a tuner
March 1, 2002
Technical Feature Measurement of On-wafer Transistor Noise Parameters Without a Tuner Using Unrestricted Noise Sources This article presents a method for calibrating the four noise parameters of a noise receiver which does not require a tuner. The method permits using general (mismatched) noise sources, which may present very different...
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Two-tone vs. Single-tone Measurement of Second-order Nonlinearity

Use of a method to correctly locate the second-order intercept point (IP2) from one- and two-tone tests
March 1, 2002
Technical Feature Two-tone vs. Single-tone Measurement of Second-order Nonlinearity Darioush Agahi, William Domino and Nooshin Vakilian Conexant Systems Inc. Newport Beach, CA This article describes how to correctly find the second-order intercept point (IP2) from one- and two-tone tests, and presents measurement results in support of the theory. Relation...
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Designing a Bluetooth Transceiver in RF CMOS

Presentation of a design methodology used to facilitate the rapid prototyping and design of an RFIC
February 1, 2002
Technical Feature Designing a Bluetooth Transceiver in RF CMOS Bob Koupal and Marshall Wang Signia Technologies Milpitas, CA Cory Edelman Agilent Technologies Westlake Village, CA The design of a 2.4 GHz Bluetooth transceiver RFIC in CMOS requires careful verification of key performance criteria at all stages of the design...
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Intermodulation Products for a Mixer Subjected to a Multi-carrier Signal

Use of a nonlinear mixer model to demonstrate how a transient simulation is used to predict the behavior of intermodulation products in a multi-carrier environment
February 1, 2002
Technical Feature Intermodulation Products for a Mixer Subjected to a Multi-carrier Signal Applying a multi-carrier signal to a mixer leads to a large range of intermodulation products. To perform a link budget of a multi-carrier transmit-receive system, it is important to predict the location and magnitude of those intermodulation...
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Cost-effective Wireless Antenna Measurement Systems

Introduction to two new antenna measurements systems for single- or dual-axis antenna pattern measurements in the wireless frequency ranges
January 1, 2002
Product Feature Cost-effective Wireless Antenna Measurement Systems MI Technologies Duluth, GA Two new antenna measurement systems have recently been introduced that add to the MI-3600 antenna measurement product line. The MI-3600 family is comprised of 20 antenna measurement systems for single- or dual-axis antenna pattern measurements in the popular...
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