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Software & CAD

Using Load Pull Analysis and Device Model Validation to Improve MMIC Power Amplifier Design Methodologies

This article describes a methodology for the design of a 2 GHz monolithic microwave integrated circuit (MMIC) power amplifier (PA) using a heterojunction bipolar transistor (HBT) process. It is based on the use of modern software tools and advanced loa...
November 1, 2002
There is certainly no shortage of information about designing power amplifiers these days, and several books address the subject quite admirably. 1-6 However, as well as these books cover the theory and underlying logic of such designs, they do not tell the reader precisely how to do it. As...
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Considerations in Capacitor-pairing to Obtain Nonstandard Part Values

November 1, 2002
Series- and parallel-combining of surface-mount capacitors is a standard approach to realize semi-arbitrary capacitance when designing a printed circuit board layout. This pairing of components is often necessary as surface-mount parts are available in only a limited number of fixed values, such as 0.5, 1.0, 2.0 pF. This article...
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Balancing the Budgets: The Importance of Dedicated Software for System Design

November 1, 2002
The International Telecommunication Union (ITU) standard Wideband Code-Division Multiple Access (WCDMA) was derived from code-division multiple access (CDMA), and is officially known today as IMT-2000 direct spread. It is a third-generation (3G) mobile wireless technology offering much higher data speeds to mobile and portable wireless devices than commonly offered...
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A CAD Tool Utilizing Fast Hybrid MM/FE/MoM FD Techniques

A three-dimensional electromagnetic-based CAD software tool is featured on this month's cover
September 1, 2002
To meet the rapidly increasing demand for advanced microwave components and antennas in wireless terrestrial and satellite-based communications, accurate and efficient CAD tools are critical. Due to efforts made during the 1990s - the decade of global 3D electromagnetic (EM) field solvers - the task of accurate analysis of...
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The Design of Bandpass Filters Considering Frequency Dependence of Inverters

In general, practical inverters have frequency-dependent impedance or admittance. The equivalent circuits of several widely used inverters are investigated, consisting of ideal inverters plus frequency-dependent real and/or immittance parts. One of the...
September 1, 2002
By using impedance or admittance inverters, microwave bandpass filters can be designed more conveniently with only one kind of resonator. Theoretically, the inverters have to be frequency independent. However, this is not true for practical cases. One of the most serious degradations in frequency response of a bandpass filter...
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Research@mwjournal.com

<I>Microwave Journal</I>'s second annual overview of microwave technology research projects currently being investigated by European academic institutions and commercial organizations
September 1, 2002
Today's investment in and commitment to meaningful, commercially viable research will determine the shape and prosperity of tomorrow's microwave industry. Following its introduction in 2001 the second Microwave Journal guide to European research projects highlights the studies being undertaken by academic and commercial establishments to develop the innovations that...
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SAW Voltage-controlled Oscillators

Presentation of applications that use voltage-controlled surface acoustic wave oscillator technology to provide high performance telecom solutions
September 1, 2002
Voltage-controlled surface acoustic wave (SAW) oscillators (VCSO) have been used for many years in both commercial and military applications. The low phase noise allows frequency multiplication to higher frequencies for use as sources, such as local oscillators in radar and other microwave systems. The excellent tuning linearity provides outstanding...
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A Simulation Builder for Versatile Framework Integration

Introduction to a versatile simulation builder designed to integrate industry-strength simulation technology with external design frameworks
August 1, 2002
As the complexity of wireless systems grows and requirements become more demanding, the task facing analog/RF engineers is not getting any easier. In today's rapid-paced working environment, time-to-market demands accurate and fast results from device simulations. To meet these demands for the effective management and analysis of design data...
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A Revolution in the Time Domain

A new modeling and design package for time domain software is featured on this month's cover
August 1, 2002
CST MICROWAVE STUDIO® Version 4 (CST MWS) is a major new release of the company's flagship 3D EM microwave modeling and design package. Over 1400 changes, enhancements and new features have been added to make this already powerful tool truly comprehensive and an invaluable resource. The microwave design engineer...
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Diclad Liquid Crystalline Polymer Circuit Material for Multilayer PCBs

A new liquid crystalline polymer circuit material for multilayer PCBs is featured on this month's cover
July 1, 2002
In today's age of high speed Internet, high frequency wireless and wireline communications, conventional materials are reaching their performance limits. Copper-based electrical connections are being limited by the dielectric properties of the insulating layer. Solutions using optical connections are available but are too expensive. Liquid crystalline polymers (LCP) are...
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