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About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024
Webmaster:
    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Hittite's (now Analog Devices) Mixer Spurious Product Calculator App

Analog Devices' (formerly Hittite's) Mixer Spurious Calculator App - RF CafeNote: Hyperlinks all around the Internet pointing to Hittite's infamous Mixer Spurious Product Calculator broke suddenly when Analog Devices swallowed them up in 2014. For a while you could find it as the ADI Mixer-Spur Graphical Representation tool on the ADI website, but now it is gone, too, and even the WaybackMachine does not have a capture of it.

Marki Microwave now has a much nicer Spur Calculator.

 

Hittite's online JavaScript app for finding mixer spurious products has been around for many years, but in case you have forgotten about it or have never seen it, now is a good time to bookmark the page. It uses a format pioneered by Collins Radio back in the middle of the last century that plots the RF/LO and IF/LO harmonics as straight lines, and then draws a rectangle within them that represents the limits of the output frequency band. Any spurious product lines that pass through the rectangle are inband at the output, and hence cannot be filtered out after the fact. I dubbed the chart a "Spur Web" in my DOS-based RF Workbench program back around 1990. It was, I believe, the first time that chart format had ever been implemented in software with a graphical user interface.

 

 

Posted November 12, 2012 (update April 2, 2021)

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