Interesting new pHEMTs

Phil Hobbs · 2018-06-29T15:18:14+00:00

So Broadcom and CEL axed all their 3-GHz class pHEMTs, but CEL has introduced some interesting new 12 GHz ones, e.g. . That one has a typical 0.3 dB noise figure at 12 GHz! I'll have to get a few and measure their 1/f noise. The SKY65050 (which you can still get) has about a 30 MHz 1/f corner, but is otherwise very nice. So hopefully these ones don't have 100 MHz corners. As with most pHEMTs, it has a horribly low drain impedance of about 200 ohms, and like most SS microwave parts, it has a low V_DSmax (4V). It would make a dynamite cascode with a BFP640 though, if I can keep it from oscillating. The 3-GHz pHEMTs are very well behaved by themselves. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510

Jun 29, 2018 22 Replies

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krw 8 years ago

Murata has the curves, too, but they're stingy with them. They also have "powdered metal" "ferrites" that have much flatter saturation curves (like the powdered metal inductors but lossy like a ferrite bead).

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John Larkin 8 years ago

Just use a second one of the one that you are measuring.

I do that to measure the nonlinearity of ceramic caps. Measure capacitance of two in series and tweak the bias at midpoint.

John Larkin Highland Technology, Inc trk jlarkin att highlandtechnology dott com http://www.highlandtechnology.com

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<698839253X6D445TD 8 years ago

This site has some nice scope traces (scroll down):

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