Sweet characteristics.
- posted
8 years ago
Sweet characteristics.
A typical ft of 42 GHz makes it fast, but you've been able to buy parts just as fast for quite a while now. What makes it worth commenting on?
-- Bill Sloman, Sydney
Looks good and cheap and in stock. I might have to get a few.
Yup. I use its little brother (BFP640) a fair amount as the cascode device for 10-mA class pHEMTs. They're pretty squirrelly though--high gain and sup er-high fT makes them want very badly to oscillate around 14 GHz. Usually I just put a Murata BLM18BB-series 5- or 10-ohm bead in the base, which make s them behave.
Trashes the BW of course, but their other virtues survive: high gain and re ally amazing linearity.
The pHEMT/SiGe cascode is very close to the ideal RF device--the only drawb ack is the high 1/f corner.
Cheers
Phil Hobbs
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