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Is there any formula/equation i could use to estimate the voltage induced at the input from the RF signals?

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  • \$\begingroup\$ What antenna? What frequency? \$\endgroup\$ – Andy aka Dec 5 '18 at 8:45
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This circuit depends on the MOSFETS, in the first differential pair of the CA3130, acting as rectifiers albeit not very good rectifiers, because the fundamental MOSFET bandwidth depends upon channel-spacing from source-to-drain but the rectification depends upon the junctions of the MOSFET, such as the source-bulk isolation-junctions and not on the channel-spacing.

And the part number ---CA3130--- is a part number from the 1970s (thus 40+ years ago). To presume the same process is used today is not a good presumption.

Summary ---- you are asking about the UHF (30-300MHz) and SHF (300 to 3,000MHz) rectification efficiency of isolation-diodes of unknown doping profile and of unknown biasing condition (both voltage and idling currents).

Answer: no.

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