Many things change in the transition from good old baseband, logic-emulating non-return-to-zero (NRZ) signaling to 4-level pulse-amplitude modulation (PAM4): We get three eye diagrams instead of one, ...
Non-return-to-zero (NRZ), non-return-to-zero-inverted (NRZI), return-to-zero (RZ), and Manchester are popular serial encoding mechanisms. Each has different characteristics that make it useful in ...
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