Instructions for Amplitude Modulation (AM)

Step 1: Click on 'Generate Message' button to generate input message signal
Step 2: Then click on 'Generate Carrier' button to generate carrier signal
Step 3: The carrier frequency has to be more than the message frequency and You can change frequencies using sliders
Step 4: Click on 'Generate Amplitude Modulated Signal' button to generate Amplitude Modulated Signal
Here, 'm' represents the modulation index. The frequency spectrum is shown for a modulation index of 1.

SYNC

TTL

sin(wt)

G (Gain):

1

A

g(DC):

1

B

GA+gB

m =

X

Y

kXY

+5V

DC

O/P

sin(wt)

DC

GND

DC

GND

Message Frequency (Hz)

50

Carrier Frequency (Hz)

500

Instructions for Amplitude Demodulation

Step 1: Tunable LPF's Cutoff frequency works in accordance with the Message frequency
Step 2: You can Demodulate the AM Signal clicking on the 'Perform AM Demodulation' button
Step 3: Click on the 'Show Frequency Spectrums' button to see spectrums of the message, AM modulated and demodulated signal

CH2-B

AM Signal

REF

COMPARATOR

RECTIFIER

DIODE + LPF

RC LPF

CLK

TUNE

GAIN

IN

OUT