aaron_do
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First of all, peak voltage depends on the impedance level. Usually there is some VSWR specification for the standard. For instance, the transceiver may need to work for a VSWR of 5:1, and not explode with a VSWR of 10:1. So for a 50-ohm system with a VSWR of 10:1, you are potentially looking at 500 ohms.
Power = V2/R
You should also take into account the peak-average power ratio. It depends on the modulation scheme. For a sine wave it is 3 dB. But I'm guessing that for 802.11g it's higher.
Lastly, the peak voltage that you are actually going to get in your circuit can be highly dependent on the implementation. It depends on things like the harmonic content of the signal, and also whether or not there are any transmission lines between the components.
Hope I haven't missed anything out, and feel free to correct me anywhere...
cheers, Aaron
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