Kandou Touts Multi-Signal Chords

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Attendees at ISSCC’s opening-night demonstration suites were privy to testing of a special long-reach serdes developed by a Lausanne, Switzerland, startup offering new interface-signaling technologies. Kandou Bus will offer IP for use in everything from internal interposers to chip-to-chip interconnects. By employing correlated signals over a varying number of wires, the company can exceed the 25/32Gbps limit of present serdes at a lower power than traditional two-wire implementations.

Loring Wirbel, The Linley Group (Networking Report and Microprocessor Report)

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The next generation’s modulation - PAM-4, NRZ, or ENRZ?

Holden explained how the ENRZ electrical interface uses four wires to transmit three bits using the codes ±{+1, -1/3, -1/3, -1/3}. That is, any pair or wires can carry the +1 code and the other -1/3 codes travel between any other pairs of wires. At 37.3 Gbaud, ENRZ can deliver 112.3 Gbps as where NRZ would need 56 Gbaud to achieve the same rate, if that’s even possible with NRZ.

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