English: A simple
envelope detector circuit, used to
demodulateamplitude modulated (AM) radio signals in
AM radio receivers. It consists of a
semiconductor diode(D) with a bypass
capacitor. The diode allows current to pass in only one direction,
rectifying the AC radio signal to a pulsing DC current, whose peak value is proportional to the modulation. The capacitor C charges up to the peak value of the pulses, following the envelope of the modulation. It serves as a
low pass filter, smoothing the pulsing current, removing the pulses of radio frequency carrier, leaving the audio frequency modulation.
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