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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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Cheap GaN
Kirt's Cogitations™ #78

RF Cafe University"Factoids," "Kirt's Cogitations," and "Tech Topics Smorgasbord" are all manifestations of my rantings on various subjects relevant (usually) to the overall RF Cafe theme. All may be accessed on these pages:

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Cheap GaN

Scientists at Sumitomo Electric Industries has figured out how to grow gallium nitride (GaN) crystals on inexpensive GaN substrates rather than on sapphire or silicon carbide substrates. Lattice dislocations (imperfect matching between GaN and the sapphire or SiC) cause inefficiencies in the operation of the blue laser diode applications that GaN is predominantly used for. GaN crystals grown on GaN substrates are nearly perfect. Still, GaN is expensive at around $10k for a 2" wafer compared to around $200 for a Si wafer 4-6 times as large. Roughly 1000 diodes can be produced from a 2" wafer, making the die cost alone about $10. Blue lasers can yield a storage capacity of 27 GB on a standard DVD (a 6x increase). Don't expect to find one of these babies in the next Sunday sale flyer PC system because the first production DVD drives are now selling for about $3800 from Sony.
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