Explain the detection of am signal using envelope detector?

Question: Explain the detection of am signal using envelope detector?

An envelope detector is a circuit that can be used to detect the amplitude modulation (AM) signal from a carrier wave. The AM signal consists of a carrier wave that has been modulated by a message signal, resulting in variations in the amplitude of the carrier wave. The envelope detector works by extracting the envelope of the modulated signal, which contains the message signal.

The envelope detector circuit typically consists of a diode, a resistor, and a capacitor. The modulated signal is fed to the diode, which only allows current to flow in one direction. The resistor is used to limit the current flow, and the capacitor is used to store charge.

When the modulated signal is positive, the diode conducts and charges the capacitor to the positive peak of the modulated signal. When the modulated signal is negative, the diode does not conduct, and the capacitor discharges slowly through the resistor. This results in a DC voltage across the capacitor that represents the envelope of the modulated signal.

To extract the message signal, a low-pass filter is used to remove the carrier frequency and any other high-frequency components. The resulting signal is a replica of the original message signal that was used to modulate the carrier wave.

In summary, the envelope detector is a simple and effective way to extract the message signal from an AM signal. It works by detecting the envelope of the modulated signal, which contains the message signal, and then using a low-pass filter to extract the message signal.

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