Lab 5: Amplitude Modulation and Demodulation

Amplitude Modulation Connection Diagram on the Analog Discovery 2
This lab introduces students to communications theory with amplitude modulation and demodulation. Students will explore the mathematical theory behind amplitude modulation and use the Analog Discovery 2 to visualize the effects of amplitude modulation in the time and frequency domains. Then, students will use LabVIEW to program an AM demodulator and use it to explore and visualize the effects of the modulation coefficient on the quality of the demodulated signal and the effects of different parameters (such as windowing and averaging) on the Fast Fourier Transform (FFT). Advanced students can challenge themselves to build a system to send data between two Analog Discovery 2s or to build an analog AM demodulator.
by National Instruments


This is lab 5 of 7 in the course, Complementary Labs for Electrical Engineering.


  • Amplitude Modulation and Demodulation Lab Manual
  • Amplitude Modulation and Demodulation VIs



  • Introductory Communications Theory

Related Resources


These labs have related concepts that can expand student experience.

Analog Discovery 2

Gives students access to a 100 MS/s oscilloscope, a logic analyzer, and six other instruments in a pocket-sized lab device.


LabVIEW is systems engineering software for applications that require test, measurement, and control with rapid access to hardware and data insights.

Required Software

Download Academic Software, Learn About Software Licensing

  • LabVIEW 2015 or later
  • Digilent WaveForms 2015
  • Digilent WaveForms VIs


Required Hardware

Purchase Engineering Education Products

  • Analog Discovery 2 - NI Edition
  • Jumper Wires
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