NI-Tutorial-3002

NI-Tutorial-3002 - Document Type: Tutorial NI Supported:...

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1/3 www.ni.com Amplitude Modulation 1. 2. 3. 4. 5. 6. Overview This tutorial is part of the National Instruments Measurement Fundamentals series. Each tutorial in this series teaches you a specific topic of common measurement applications by explaining the theory and giving practical examples. This tutorial covers an introduction to RF, wireless, and high-frequency signals and systems. For the complete list of tutorials, return to the , or for more RF tutorials, refer to the . For more information about NI Measurement Fundamentals main page NI RF Fundamentals main subpage National Instruments RF products, visit . www.ni.com/rf Table of Contents Amplitude Modulation Mathematical Background Types of AM Modulation Reality Check Related Products Conclusion Amplitude Modulation Modulation is the process of varying a higher frequency carrier wave to transmit information. Though it is theoretically possible to transmit baseband signals (or information) without modulating it, it is far more efficient to send data by modulating it onto a higher frequency "carrier wave." Higher frequency waves require smaller antennas, use the available bandwidth more efficiently, and are flexible enough to carry different types of data. AM radio stations transmit audio signals, which range from 20 Hz to 20 kHz, using carrier waves that range from 500 kHz to 1.7 MHz. If we were to transmit audio signals directly we would need an antenna that is around 10,000 km! Modulation techniques can be broadly divided into analog modulation and digital modulation. Amplitude (AM) is one form of analog modulation. modulation Figure 1. Basic Stages of AM Mathematical Background The carrier signal is generally a high-frequency sine wave. There are three parameters of a sine wave that can be varied: amplitude, frequency, and phase. Any of these can be modulated, or
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NI-Tutorial-3002 - Document Type: Tutorial NI Supported:...

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