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Build Your Own Transistor Radios by Ronald Quan

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Chapter 16In-Phase and Quadrature (IQ) Signals

This chapter will explore amplitude modulation in a little more detail. The objectives are

1. To take a brief look at broadcast amplitude-modulated (AM) signals

2. To examine double-sideband suppressed carrier (DSBSC) AM signals

3. To use the DSBSC signal to generate I and Q signals

4. To determine how I and Q signals are demodulated

5. To apply I and Q signals to software-defined radios (SDRs)

Broadcast AM signals are generally modulated with a carrier signal and an audio signal. There is only one phase of carrier signal, and in the standard envelope detection of the AM radio signal, this phase information is normally not used. The standard AM signal is known as an amplitude-modulated signal with ...

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