this post was submitted on 19 Oct 2025
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Programming
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This is discussed around the 27 min mark of the video with Dr. Steven Bos, particularly in maintaining voltage thresholds for signal propagation when using multiple devices, in context of logic, memory, and communication use cases. Interestingly, for example, GDDR7 and USB 4.2 already use physical ternary signals.
Edit: signal to noise ratio is also discussed at the 40min mark, also with respect to increasing information density vs complexity from higher symbol bandwidth, or terms of radix vs frequency.
They use QAM and similar because it's the best way to transmit data over a small number of long wires. Exactly the opposite of wires inside a CPU.