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A high-pass filter can become a F-to-V converter. It needs careful adjusting in order to create a rolloff curve that resembles linear response. Output is AC.
The simulation demonstrates the raw concept. It might require some ingenuity to adapt it to your purposes.
If you want DC output, then some kind of peak detector is needed. Ordinarily it could be a diode-RC network, although it may be difficult to design for frequencies as fast as 3 GHz.
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