From: Daku on
Could some electronics guru provides some URLs for authentic buffered
FET logic and/or direct coupled FET logic ? Thanks in advance.
From: Tim Williams on
Google "74HC application note". 74HC is always buffered (but there is the
occasional 74HCU which is specifically unbuffered). Ditto for 4000 series
logic, CD4001BE is buffered, -UBE is unbuffered.

Tim

--
Deep Friar: a very philosophical monk.
Website: http://webpages.charter.net/dawill/tmoranwms

"Daku" <dakupoto(a)gmail.com> wrote in message
news:2f106665-962a-445b-a176-5f856faab9dc(a)o7g2000prg.googlegroups.com...
> Could some electronics guru provides some URLs for authentic buffered
> FET logic and/or direct coupled FET logic ? Thanks in advance.


From: John Larkin on
On Wed, 11 Aug 2010 00:45:25 -0700 (PDT), Daku <dakupoto(a)gmail.com>
wrote:

>Could some electronics guru provides some URLs for authentic buffered
>FET logic and/or direct coupled FET logic ? Thanks in advance.

Like GaAs DCFL, the GigaLogic stuff? That was depletion load, I think,
like old-old NMOS stuff. Power hog.

John

From: Tim Williams on
"John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in
message news:gcq566pvub8jtqbtirn8oiu6s0rbt5ge1s(a)4ax.com...
> Like GaAs DCFL, the GigaLogic stuff? That was depletion load, I think,
> like old-old NMOS stuff. Power hog.

Yuck, GaAs logic. It sounds like a good idea, until your signal has to
change back.

Silicon PMOS aren't terrible, good enough to make high speed CMOS with.
They're almost impossible to find discrete though. I haven't been able to
find a P type 2N7002 for the same price.

The suckiness of PFETs is directly related to the bandgap. Silicon is
moderate, so PFETs are okay. GaAs and GaN make shitty PFETs. I can only
imagine how poorly SiC and diamond PFETs will work, when they come along.
I suppose they may already exist in the laboratory, I don't know.
Curiously, this seems to imply that Ge-CMOS would be quite nice indeed,
but the leakage is something else.

Tim

--
Deep Friar: a very philosophical monk.
Website: http://webpages.charter.net/dawill/tmoranwms


From: markp on

"Tim Williams" <tmoranwms(a)charter.net> wrote in message
news:XZC8o.1154$co1.1062(a)newsfe11.iad...
> "John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in
> message news:gcq566pvub8jtqbtirn8oiu6s0rbt5ge1s(a)4ax.com...
>> Like GaAs DCFL, the GigaLogic stuff? That was depletion load, I think,
>> like old-old NMOS stuff. Power hog.
>
> Yuck, GaAs logic. It sounds like a good idea, until your signal has to
> change back.
>
> Silicon PMOS aren't terrible, good enough to make high speed CMOS with.
> They're almost impossible to find discrete though. I haven't been able to
> find a P type 2N7002 for the same price.

You mean PMOS as in P-channel MOSFET? Is that enhancement mode? There are
certainly quite a few P channel enhancement mode MOSFETs around, I tend to
use the BSS84 as a P-channel equivalent of the 2N7002. They are pretty close
in price, certainly not significantly more, and multi-sourced.

>
> The suckiness of PFETs is directly related to the bandgap. Silicon is
> moderate, so PFETs are okay. GaAs and GaN make shitty PFETs. I can only
> imagine how poorly SiC and diamond PFETs will work, when they come along.
> I suppose they may already exist in the laboratory, I don't know.
> Curiously, this seems to imply that Ge-CMOS would be quite nice indeed,
> but the leakage is something else.
>
> Tim
>


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