Thanks, Pieter. This would be for business but I also still have a few dozen because I bought them before they became difficult to obtain. Lots of (mostly European) hobby shops actually still carry them. They are excellent parts for hobby electronics. Thing is, we need better LF noise than the BF245 could provide.
The Wikipedia entry matches my usage of the word pretty much exactly. For example, stating a "repeatability" specification in large print while the actual accuracy specification is elsewhere in small print and you have to add several error terms to *that* number to get the actual worst-case error.
Best regards, Spehro Pefhany
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speff@interlog.com Info for manufacturers: http://www.trexon.com
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It's just a one-pager what I found but yes, the IF9031 and others do look nice. Might have to call them up to see how they are sold. The distributors I looked at don't carry that manufacturer.
Yes, Phil had already mentioned that one iand it's an excellent JFET. Toshiba doesn't seem to be a big believer in SMT though. But we can probably cram one in there, the others don't have to be that good.
It ain't my favorite because it's single-sourced. Usually RF FETs aren't that great at audio.
with some of the modern day rap music I hear blasting out of these cars going by while they attempt to knock out my windows with that distorted base, I would thing that noise factor in the audio spectrum would be attractive!
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"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5
Without something to support the supposition, yes, I think it is. Many parts designed specifically for RF work have rather terrible audio noise figures. The 1/f noise may well start at 10kHz or even above. The equipment we build that covers to 100MHz and above often has rather poor low-audio-range noise performance, but then very few of our customers are looking with this equipment below 1MHz even.
People like NXP's BF862, but you don't like NXP (by the way I've seen their bipolar discretes fab. Second biggest discretes fab in the world, after Rohm, and continuously expanding). Specced 0.8nV/rtHz @ 100kHz (a lot of good that'll do you).
As a dual I've got NXPs PMBFJ620 in my drawer but haven't tried it out yet. Datasheet says 6nV/rtHz @ 100Hz.
Ciss of the 862 is roughly 2x that of the 620, so I'd expect the 862 to be less noisy than the 620 (but that's not even a hand-waving deduction any more, it's more like arms-flailing).
Then there are of course things like Interfet's IF3601 (single) and IF3602 (dual, 0.3nV/rtHz @ 100Hz), but it's my hunch that you're not keen on spending big $$$ on something in a TO-99 can.
I really hate it when they tout a fancy new chip, you scoot over to Digikey and then there ain't none. Whereas Costco, Walmart and others stuff their shelves before placing any ads. At least as far as I am concerned semi mfgs have blown countless Dollars on ads where I looked once and never returned. Same for fantasy pricing. Remember when TI mentioned under MSP430 "starting at 49c" whereas in reality the lowliest version cost almost a buck in qties?
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