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resistion
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SAR rating?
resistion   8/4/2014 10:35:59 PM
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I share tb100's safety concern. What would be the effective SAR rating for this charger?

tb100
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focusing RF power
tb100   8/4/2014 9:24:42 PM
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I'm a little leary of transmitting focused RF power. On the other hand you could put your burrito on top of your phone so it would receive some of that focused power to heat it up.

On a more serious note, I've always wondered if a tiny, very-low-power device could harvest power from all the RF being broadcast all over the place these days: WiFi at 2.4GHz, 5GHz, all the various cell frequencies, even the old UHF,VHF radio and television.

Certainly it is possible to build a tank circuit to capture some of this power. I'm just wondering if it is enough to do anything with. Maybe you could have a sensor that just collects miscellaneous RF power for a few hours, then it could broadcast its data for a few microseconds.

rick merritt
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Limited but cool
rick merritt   8/4/2014 6:40:21 PM
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Who else is targeting this RF approach?

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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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