what is the function of square law device and bandpass filter??
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Square law device is used, to eliminate the need of generating carrier at receiver end as demodulator. result of a square law will have desired component as well as harmonics. to suppress these harmonics, bandpass filter (sometimes low pass) is used.
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square law device are mainly used in modulater and detector and The band pass filter used in modulater is centered at the frequency of carriers wave.
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