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Magnitude of IQ demodulator

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watertreader

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Hi,

Is there any commercially available circuit that you can get for obtaining the magnitude of an IQ demodulated signal R = (I^2 + Q^2)^0.5 ?

Most of the circuit i see is in digital implementation... using an digital IC to obtain the magnitude... how about analog one? could we just use some diode?

Thanks
 

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