Howtosignalprocessing
- What is the role of an envelope detector in a FM demodulator?
- Why the envelope detector is so popular in AM demodulation?
- How does envelope detector circuit work?
- What is envelope detection method?
What is the role of an envelope detector in a FM demodulator?
An envelope detector can be used to demodulate a previously modulated signal by removing all high frequency components of the signal. The capacitor and resistor form a low-pass filter to filter out the carrier frequency.
Why the envelope detector is so popular in AM demodulation?
The main advantage of this form of AM Demodulator is that it is very simple and cheap! Just one diode, one capacitor, and one resistor. That's why it is used so often. However, it does suffer from some practical problems.
How does envelope detector circuit work?
The capacitor in the circuit stores up charge on the rising edge, and releases it slowly through the resistor when the signal falls. The diode in series rectifies the incoming signal, allowing current flow only when the positive input terminal is at a higher potential than the negative input terminal.
What is envelope detection method?
This envelope detection method involves squaring the input signal and sending this signal through a lowpass filter. Squaring the signal effectively demodulates the input by using itself as its own carrier wave.
