Probably so. (Having a mostly-bipolar circuit design background and an advanced-CMOS processing background, I often expect the two to be closer than they actually are.)
Maybe the MOS devices are complementary to placate the bipolar ones. ;)
Cheers
Phil Hobbs
Sno-o-o-ort ;-)
My preferred world, at least for Analog, is BiCMOS. ...Jim Thompson
Okay, so the doping gradient would actually make the EB depletion zone thicker then, which ought to increase V_CEO vs V_CBO. What accounts for the lower breakdown voltage if the doping is really the same?
The only other things I can think of push the other way--the reverse beta is a bit lower because the effective base width is wider when depleting the graded junction. The emitter leakage is beta_R times the actual base leakage current, so even if V_CES = V_EBS, V_CEO would be less than V_EBO.
Cheers
Phil Hobbs
I'm not sure. Been a _very_ long time since I cracked open a copy of Al Phillips' book... like maybe the mid '60's, when I had his course, taught by the author himself, at Motorola SPD. (Googling him to make sure I spelled his last name properly, looks like he went on to found Western Digital ~1970) ...Jim Thompson
Posers, pretenders? :)
At least Si-PMOS isn't as bad as, say, GaAs PMOS, which as I understand it, might as well be like using toobs (N-vacuum only* ;) ).
*Some day I want a bell jar with hard-vac stuff, a bottle of hydrogen, and a proton gun, so I can try making a "P-type" tube. Guessing the performance (perveance or something equivalent, and transit time) are going to be atrocious, by approximately a factor of 2000.(Then try it with deuterium, and see if it's even worse?)
(...Then try it with D-T mix, and a really high voltage target? :D )
Tim
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Well there is epitaxial layers that have been used as active region material. Not done very frequently though, ISTR there were some issues with dopant concentration control. Or maybe i am just imagining this.
?-)
No. Just confused ;-) Expitaxy is regularly used now for collector regions. I've seen some experimentation with using it for base as well, but so far I've not seen it in a commercial release. ...Jim Thompson
Synchrotrons routinely use positron fill instead of negative electrons; there's a trick with negative-work-function interaction that makes the beam easier to refrigerate, and enhances storage lifetime.
Mainly, though, this is a larger-than-a-bell-jar kind of operation.
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