We have IGBT's but what about the reverse? A mosfet like device who's gate is current controlled? This might not seem very useful but they would remove the need for special drivers?
- posted
14 years ago
Current controlled fet?
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- posted
14 years ago
BJT. Verrrry special technology.
-- www.wescottdesign.com
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14 years ago
Not really much of a stretch... integrated lateral PNP's include a plate (gate) over the base region, so they are MOS-like but with base current. ...Jim Thompson
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- posted
14 years ago
Or if you want another 4-layer structure, they make SCRs, and complementary to IGBTs, they also make IG SCRs (I forget the proper acronym).
Structurally, a BJT is indeed analogous. That reminds me, I need to find a four-lead MOSFET and see if I can use its substrate as base of an NPN. I'm guessing beta is poor, but might be equal in both directions.
Tim
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- posted
14 years ago
Tim - looking for an isolation transistor for a "wired-or" bus? If so, look at some of the 2 transistor 6 pin devices from Rohm & ? & ? - don't rember the names. Both way gain isn't shown in the specs & you'll need to get them and measure for that spec. The ones I've seen were quite effective on a 5v bus.
Hul
Tim Williams wrote: