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Comfortable
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re: Who holds power in wireless charging?
Comfortable   10/31/2012 3:44:11 PM
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...forgot to comment why a toothbrush-type application makes sense. This is an application where the charger functionality is hidden. The toothbrush charger is primarily a storage socket to keep your toothbrush off the counter - and oh by the way it also charges. A portable phone doesn't always sit on the charger pad. You have to go out of your way to put your phone where you normally don't store it. Another bigger application is a floormat electric car battery charger. Again, you park you car on the garage floor - and oh by the way the mat on the floor couples the charge while you are parked.

Comfortable
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re: Who holds power in wireless charging?
Comfortable   10/31/2012 3:37:09 PM
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Apple has already said they have no plans for wireless charging. And their reasoning is sound: one still needs to plug a charger into the wall. And as far as a universal charging standard: that already exists. It's called USB and is used by everyone in the business. If wireless charging makes sense, it will be in applications that are similar to a toothbrush - a charging solution that's been around for more than one decade.

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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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