Square-law detector

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In electronic signal processing, a square law detector is a device that produces an output proportional to the square of some input.[1] For example, in demodulating radio signals, a semiconductor diode can be used as a square law detector, providing an output voltage proportional to the square of the amplitude of the input voltage over some range of input amplitudes. A square law detector responds to the power of the input electrical signal.


  1. ^ IEEE Std. 100 Authoritative Dictionary of Standards Terms Seventh Edition, IEEE, 2000, ISBN 0738126012,Square law detection