We use AD8318, I would like to know this device actually detects the power, i.e Is this a thermal power detector, diode based detector etc. Thank you in advance.
I moved your question to the RF and Microwave community. Someone from here will be able address your concern.
It does not detector power inherently; it is a voltage responding part. We specify it in dBm's (i.e. Vout vs. Pin) with a shunt input resistor on the eval board to create an equivalent 50 Ohms looking into the part, but this is merely a convention. You could just as easily specify it in dBV's or Vrms, i.e. Vout vs. Vin (dBV or Vrms).
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