Detectors 100
Detectors 100 : Particle Detectors: (4.6) Detector (Radio): (1) Amplitude Modulation Detectors: (1. 1) Envelope Detector: One major technique is known as envelope detection. The simplest form of envelope detector is the diode detector that consists of a diode connected between the input and output of the circuit, with a resistor and capacitor in parallel from the output of the circuit to the ground to form a low pass filter. If the resistor and capacitor are correctly chosen, the output of this circuit will approximate a voltage-shifted version of the original signal. An early form of envelope detector was the cat's whisker, which was used in the crystal set radio receiver. A later version using a crystal diode is still used in crystal radio sets today. The limited frequency response of the headset eliminates the RF component, making the low pass filter unnecessary
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