Flexible Software For Hard Times

Nov. 17, 2009
Many designs within these pages begin in software. More specifically, high-frequency designers now rely on software simulation tools to predict the performance of a design, or calculate the dimensions of transmission lines in a microstrip ...

Many designs within these pages begin in software. More specifically, high-frequency designers now rely on software simulation tools to predict the performance of a design, or calculate the dimensions of transmission lines in a microstrip matching network, or create a high-quality-factor (Q) notch in a bandreject filter. Their software tools have evolved from home-grown code to more complex software "environments" combining circuit, system, electromagnetic (EM) simulators, and layout tools, as a sort of software-based method of "double-checking" deisgns.

Of course, with the growing sophistication of these software tools comes a corresponding increase in price. For larger companies, the higher cost of software is not an issue, since computer-aided-engineering (CAE) software is now an essential and accepted part of the high-frequency design process. But for smaller companies, or individuals with an entrepreneurial bent, the cost of a complete suite of CAE design tools can be prohibitive.

When funds are limited, there is still hope, since this industry offers a variety of free software programs. For designers of frequency synthesizers based on phase-locked loops (PLLs), for example, PLLSim is a free PLL simulator available from a number of different sites, while ADIsimPLL is a free design from Analog Devices based on the use of that company's synthesizer integrated circuits (ICs). The site www.microwavers.org offers a number of free software programs, including a transmission-line calculator, a microwave simulator, a synthesizer simulator andnot to be confused with their Advanced Design System (ADS) suite of design toolsthe classic ApCAD from Agilent Technologies.

Microwave Software offers six software programs at around $30 or less. The software programs include a Smith-Chart-based impedance-matching program (Smith- Match), a frequency-domain circuit-analysis tool (Sceptre), and a matching-network optimization program (OptiMatch). R. A. Wood Associates provides a number of low-cost tools, including RF Path Analysis Toolkit, SpurFinder, and RFSpecTest. Free trial versions are available on the R. A. Wood web site.

Even well-established software suppliers often offer free trial versions of their software, such as the EM simulator Sonnet Lite from Sonnet Software and Microwave Office and EM simulator AXIEM from AWR.

Of course, the old adage that "you get what you pay for" is usually true. But for some designs, basic software tools may be all that is needed, and without the sophisticated price tag.

About the Author

Jack Browne | Technical Contributor

Jack Browne, Technical Contributor, has worked in technical publishing for over 30 years. He managed the content and production of three technical journals while at the American Institute of Physics, including Medical Physics and the Journal of Vacuum Science & Technology. He has been a Publisher and Editor for Penton Media, started the firm’s Wireless Symposium & Exhibition trade show in 1993, and currently serves as Technical Contributor for that company's Microwaves & RF magazine. Browne, who holds a BS in Mathematics from City College of New York and BA degrees in English and Philosophy from Fordham University, is a member of the IEEE.

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