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This blog post by instructor Rick Lyons investigates the clever properties of the number 9.
These seminar notes give a good discussion of the principles of phase noise. Specifically the authors describe the difference between measuring phase noise directly or using phase/frequency demodulation techniques. The notes describe details about the limitations and equipment performance requirements for making phase noise measurements using a variety of techniques. Since these notes are from an older archive, the latest techniques involving the use of correlation are not described.
This short film by Muppet creator Jim Henson depicts a form of "artificial intelligence" as it was envisioned in 1963. The sequence showing the robot gathering vast amounts of data is perhaps prescient of our present-day web crawlers, marketing databases, and government intelligence agencies?
Everything RF is a product-focused website intended to help users find RF components more easily.
RF Globalnet is a product-focused website that helps simplify your search for RF components. You can also view white papers and app notes organized by industry segment.
Everything RF has a page dedicated to calculators for RF applications. These include:
eCalc was formerly its own product/website but more recently has been incorporated into the EEWeb collection of engineering tools. It is a streamlined multi-function calculator, with unit conversion and several built-in scientific constants, that can be customized to suit the users preferences (including RPN operation!). The free online version runs without any special plug-ins required. Downloadable versions can be purchased for Windows and Mac OS (free trial available).
The electronics and electrical engineering tools section of the EEWeb site features several online calculators for RF and PCB related problems. The page also features links to graph paper templates (standard, log/log, etc.) that you can download and print as well as reference sheets on trigonometric identities, algebra, and integrals.
Logarithmic amplifiers provide an output voltage that is logarithmically scaled relative to the amplitude envelope of the input signal. Historically these have been used to provide logarithmic Y-axis scaling to spectrum analyzer displays, for example. This app note describes the basic block diagram and principles of operation of a log amplifier.
Converting a phase noise specification to jitter is often desirable for digital designers and others used to working in the time domain. This app note describes the principles of phase noise as well as deriving the conversion to jitter. A useful list of references is also included.