25 ms·
It wasn't really a matter of twisting. The phrase "Moore's Law" got coined in an interview at the same 1975 conference where Dennard presented on his scaling l
by Symmetry 4y ago
It wasn't really a matter of twisting. The phrase "Moore's Law" got coined in an interview at the same 1975 conference where Dennard presented on his scaling laws and has never referred just to the first periodic doubling Moore noted in his 1965 paper.
- vlovich123 4y agoBack then, the transistor switching speed was 1:1 correlated with size and the sizes we're talking about then the size dominated (capacitance between gate & source). That decoupled in the late 90s / early 00s (if my recollection of news is correct) & kept getting more decoupled. These days you can have a switching speed of 604 Ghz but that doesn't translate to overall clock speed (dominated by critical path latency of your pipeline) + there's thermal issues. Disclaimer: Not an EE / HW designer. Going off of memory from tech news + some university courses (info may be incorrect / stale).
- Symmetry 4y agoIt was more that leakage current (i.e. thermal issues) and velocity saturation suddenly becoming constraints on how much you could increase switching speed along with the difficulty of high frequency clock distribution. Your individual transistor switching speed is always going to be a lot faster than your clock speed because a pipeline stage has to be made up of many layers of transistors to get anything useful done (including latch the signal at the clock edge!) and each transistor will typically drive multiple others. I was seriously considering being a chip engineer for a while and did my master's thesis on adder design.
- mardifoufs 4y agoWhat made you change your mind?
- Symmetry 4y agoRealizing that I'd be a small cog in a large team for most of my career down that path.