22 Jun
2004
22 Jun
'04
2:16 a.m.
I'd guess that power transistors of that size
aren't very vulnerable to
radiation,
They are as the active region is still very small.
(I suspect) much of a valve's rad-hardening is due
to sheer size,
It is.
Lee.
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22 Jun
22 Jun
1:51 p.m.
New subject: Modern Electronics (was Re: List charter mods & headcount...
(I suspect)
much of a valve's rad-hardening is due to sheer size,
It is. 
4:43 p.m.
New subject: Modern Electronics (was Re: List charter mods & headcount...
On Tue, 22 Jun 2004, Tony Duell wrote:
I am not convinced. I remember reading that the tiny field-emission
vavles etched into a silicon chip (which, BTW, are smaller than the mean
free path of an electron in air at stmospheric pressure so they don't
need to be evacuated) are considerably more radiation hard than
conventional transistors on the same chip.
-tony
I'm not convinced either...
I think the problem with semiconductors is that the radiation ionizes (creates
carrier pairs) in the semiconductor, in a vacuum tube, there is nothing to
ionize (though photo-electric currents are possible)
Peter Wallace
(I suspect) much of a valve's rad-hardening is due
to sheer size,
It is. 
5:12 p.m.
New subject: Modern Electronics (was Re: List charter mods & headcount...
Strictly speaking, aren't gaseous and solid state devices
both semiconductors? They conduct electricity conditionally
in both cases.
John A.
7:02 p.m.
New subject: Modern Electronics (was Re: List charter mods & headcount...
Strictly speaking, aren't gaseous and solid state
devices both
semiconductors? They conduct electricity conditionally in both
cases.
sem?i?con?duc?tor
n.
1. Any of various solid crystalline substances, such as germanium or
silicon, having electrical conductivity greater than insulators
but less than good conductors, and used especially as a base
material for computer chips and other electronic devices.
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23 Jun
23 Jun
2:52 a.m.
New subject: Modern Electronics (was Re: List charter mods & headcount...
>>>> "John" == John Allain
<allain(a)panix.com> writes:
John> Strictly speaking, aren't gaseous and solid state devices both
John> semiconductors? They conduct electricity conditionally in both
John> cases.
Yes, but that's not what "semiconductor" means. Semiconductor
describes the material of which the device is built, not the device
action.
Semiconductors are things with a small positive bandgap, as opposed to
insulators, which have a large bandgap, and conductors, which have
none.
paul
22 Jun
22 Jun
6:08 p.m.
New subject: Modern Electronics (was Re: List charter mods & headcount...
(I suspect) much of a valve's rad-hardening is due
to sheer size,
It is.
7369
days inactive
7370
days old
6 comments
6 participants
participants (6)
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allain＠panix.com -
ard＠p850ug1.demon.co.uk -
Lee.Davison＠merlincommunications.com -
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