Design a single-sideband AM modulator and demodulator units based on following rules. Design Principles: bandwidth of filter you will design will be 6kHz in case of double sideband solutions. the carrier frequency is 4MHz. a) Determine the values of elements (if any; R, C, and L) used in the circuits. b) In case of noise (added to the modulated signal, What can be the SNR at i/p stage of demodulator? What can be the SNR at o/p stage of demodulator?
Design a single-sideband AM modulator and demodulator units based on following rules.
Design Principles:
- bandwidth of filter you will design will be 6kHz in case of double sideband solutions.
- the carrier frequency is 4MHz.
a) Determine the values of elements (if any; R, C, and L) used in the circuits.
b) In case of noise (added to the modulated signal,
- What can be the SNR at i/p stage of demodulator?
- What can be the SNR at o/p stage of demodulator?
Part (a):
There are various ways to detect the amplitude. But we will consider the simplest method that is known as a envelop detector. In an envelop detector, a diode is connected in series with parallel combined a resistor and the capacitor. The following diagram is the envelope detector circuit.
In the above circuit diagram, the diode rectifies the input modulated signal. When the input signal increases, the capacitor starts to store the energy. When the input signal decreases, the capacitor begins to release the energy. The time constant of the circuit is given by:
Part (b):
Consider the SSBSC modulated wave is given by:
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