Electronics > Projects, Designs, and Technical Stuff
CPU Clock Speed based on MOSFET Physics Gate Length, Electic Field...
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T3sl4co1l:
I've heard it suggested (as if to imply practicality...) that a ZISC could run at perhaps 40GHz.

Basic ops on a ZISC are terrifying illustrations of theoretical CS; a single addition takes hundreds of cycles, IIRC.

Tim
viperidae:
Why would you ignore turbo frequencies?
The silicon is perfectly capable of running at the higher speeds, the only issue is thermal.

Kilrah:
Yep, hadn't seen that mention in the OP... But if you care about what the process limitations are you should indeed actually be looking ONLY at turbo speeds.

Base clocks have nothing to do with process, they're just an arbitrary limit set to satisfy the specced TDP.
Wimberleytech:

--- Quote ---
Rds(on) (or more directly, mobility) has a positive tempco.  Vgs(th) also has a negative tempco, so higher voltages are needed, to some extent.  Capacitance stays mostly... well, it has a tempco, but not as strong, AFAIK.


--- End quote ---

Mobility has a negative tempco (T-1.5)
Thus R has a positive tempco

I know you know this...just correcting for the record.
Wimberleytech:

--- Quote from: T3sl4co1l on December 12, 2018, 05:59:33 pm ---
I wonder if the advantage is completely swamped by the dominant resistance in interconnects and such small transistors.


--- End quote ---

Yes, I believe interconnect (R and C) are a big factor in hitting the speed bump.
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