----- Original Message -----

From: Doug Hale

To: Electronics_101@...

Sent: Monday, October 29, 2001 12:54 PM

Subject: [Electronics_101] No metal in MOS?

The context of no metal had to do with fabrication of the transistor,
not interconnecting them.

MOS means metal oxide semiconductor.. the metal oxide forms the
transistor gate. A poly gate transistor
has the metal oxide replaced with poly-silicon. We still cal it a MOS
transistor - either due to tradition - or because PSS is harder to
say(ha ha). (and CPSS? instead of CMOS would even be worse)


Doug Hale


Kevin Vannorsdel wrote:

>For RAM processes?? This is interesting... are you saying you use NO metal
>interconnects in RAM?? Even for power distribution??
>
>Very curious.? KV.
>
>________________________________________________
>?? Kevin Vannorsdel???? IBM Arm Electronics Development
> 408-256-6492??? Tie 276-6492??? kv@...??? KF6YCI
>
>Please respond to Electronics_101@...
>To:????
>cc:
>Subject:??????? Re: [Electronics_101] Re: Fuses--for kevin;-)
>
>
>
>
>hey ,
>
>just to add...now we use polysilicon instead of the? metal...:-)
>
>Regards :-),
>
>--himanshu sharma
>----- Original Message -----
>From:? Kevin Vannorsdel
>To: Electronics_101@...
>Sent: Monday, October 29, 2001 9:54? PM
>Subject: Re: [Electronics_101] Re: Fuses? vs. resistors
>
>I'm new to this group so missed the CMOS topic (which I? would have
>enjoyed)...? CMOS transistors use metal as interconnects? -? mainly
>aluminum.? The latest silicon processes are beginning? to use Copper as
>interconnects.? This is fairly widely publicized so? you may all know
>this.
>
>The CMOS transistor itself is made of standard P? and N type silicon?
>(with
>various doping levels) along with? Poly-Silicon for the gate and a bunch
>of
>silicon dioxide for the gate? dielectric.
>
>Metal is still a very important issue in IC design.?? See my previous
>comments on? electromigration...
>
>KV.
>
>________________________________________________
>??? Kevin Vannorsdel???? IBM Arm Electronics? Development
>408-256-6492??? Tie 276-6492???? kv@...??? KF6YCI
>
>Please respond to? Electronics_101@...
>To:????? Electronics_101@...
>cc:
>Subject:??????? Re: [Electronics_101]? Re: Fuses vs. resistors
>
>
>
>heros,
>
>>or that the length? of a wire has nothing to do with resistence
>>? -? mark
>>
>>>But I do find it surprising that one who likes to? get things stated
>>>
>>correctly does not want a wire to be called a? resistor!!
>>
>
>Since these quotes are all mixed up and shortened I don't? know who said
>what
>and for certain what he said. Here's my parting shot? on the fuze,
>resistor,
>etc. topic.
>I was wrong when I originally? said that a fuze has no resistance, and of
>course the resistance is? required for it to fuze, i.e. blow, when it's
>rated
>current passes? through it.? That something has resistance doesn't make it
>
>a
>resistor. If it did we'd have to call everything that is not an? insulator
>
>a
>resistors, transformers, wires, fuzes, etc. A resistor is? not simply a
>device
>that has resistance but one in which resistance is? utilized as part of
>the
>circuit design, to achieve a voltage drop when? connected in series, to
>bypass
>current in a device when in parallel,? i.e. shunt like the old D'Arsonval
>(SP?) analog meters when used to measure? current. Someone earlier said
>that
>CMOS devices actually no longer use? Metal, I don't know whether that is
>so,
>but we don't stop calling them? CMOS, which may be why I didn't know that
>metal is no longer used in their? manufacture.
>
>Anyway, that's my swan song on the? issue.
>
>Jim
>
>
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