I spent a lot of time working with embedded wireless devices at my last job, so you'd think I'd have learned these things. Or at least, that it would have sunk in
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A lot of recent 802.11 chipsets are entirely standard CMOS processes. I guess as far as being able to make cheap products that has been a big innovation, being able to make 2.4/5 ghz radio stuff without special semiconductors.
Not sure that would really be necessarily ESD safe either on the antenna.
I would think a less cheapass design could be a lot more ESD-safe. I wonder if a high-pass filter with a 1ghz cutoff would help a lot.
I think you're right about the receive path, RF mixing, and transmit signal generation stages, but more exotic substrates are still commonly used in the RF PA for high-output (above about 5-10 dBm) devices. The particular device I have the most experience with, the highly quirky uPG2250T5N, is GaAs; another device (a Skyworks part) we used in a different project was InGaP.
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Not sure that would really be necessarily ESD safe either on the antenna.
I would think a less cheapass design could be a lot more ESD-safe. I wonder if a high-pass filter with a 1ghz cutoff would help a lot.
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