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:
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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
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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.
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Kevin Vannorsdel IBM Arm Electronics Development
408-256-6492 Tie 276-6492 kv@... KF6YCI
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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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