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Old 22nd February 2013, 09:58 AM   #191
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Like I said. Tooo compllicated
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Old 22nd February 2013, 12:46 PM   #192
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Back to our regularly scheduled pgm...
ZM Same as last time with the addition of a .25 ohm Rs, X= Vds, Y= Ids
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Old 22nd February 2013, 12:54 PM   #193
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sorry - I disregarded fact that you're primary interested in low current & low voltage area ;

in that case - choose bigger , arbitrary for start , value for Rs

say 3R3 , then build from that

gain will suffer , but who cares
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Old 22nd February 2013, 12:55 PM   #194
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Not bad there ZM I guess a little more Ids would be representative of our typical operating point.
Comparing my first graph to one with a source resistor (of ZM's Choice), we easily see the no Rsource configuration was begining to get much higher gain at higher current. The Vgs applied was nice even intervals of .1V. If the gain were stable or flat across the range I was testing, the the curves would also be at equal intervals. As can be seen in the graph with the Rs of .25
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Old 22nd February 2013, 12:57 PM   #195
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those are olde triode tricks , from yore tricksters

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Old 22nd February 2013, 01:36 PM   #196
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So ZM, you want to see up to 4 or 5A. I kinda like this Rs value. I'll start with that...
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Old 22nd February 2013, 01:44 PM   #197
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nope - I'm just implying which value(s) for RS , to investigate low I/U region

I'm not wanting to see anything particularly
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Old 22nd February 2013, 01:58 PM   #198
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If there ate no more requests I'm going to run it up towards 20Vds and a few amps Id.
Then I want to try the R085
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Old 22nd February 2013, 03:45 PM   #199
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Run away!
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Old 22nd February 2013, 06:18 PM   #200
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Quote:
Originally Posted by Semisouthfan View Post

I will attend PCIM-Europe this year (again) and listen (again) to Infineon announce this JFET. How many times now? These devices were developed by a small German company called SiCED that Siemens and Infineon invested in. They've been trying to find a market for these things for 10 years. I bought some when they were made by SiCED, which Infineon then acquired. I'm trying to find the parts lost in my lab somewhere to see if they might be good for audio. I remember they weren't much good for switching due to depletion mode with very negative pinch-off voltage. Infineon is trying to fix that by selling a dedicated gate driver chip and giving it a catchy name like "CoolSiC" to co-market with their "CoolMOS" brand super-junction silicon MOSFETs. For audio, it's all in the saturation characteristics. Depletion mode is like a tube, so many audio folks won't care. I don't think they will be cheap.

If you do not find them in you lab I could have a look in mine and borrow you some. I think I am to busy and not experienced enough for audio applications ;-)
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