DEMODULATION - INAOE

3-1 CHAPTER 3 DEMODULATIONLEARNING OBJECTIVESUpon completion of this chapter you will be able to:1. Describe cw detector circuit operations for the heterodyne and regenerative Discuss the requirements for recovery of intelligence from an AM signal and describe the theoryof operation of the following AM demodulators: series-diode, shunt-diode, common-emitter, Describe fm DEMODULATION circuit operation for the phase-shift and gated-beam discriminatorsand the ratio-detector Describe phase DEMODULATION circuit operation for the peak, low-pass filter, and chapters 1 and 2 you studied how to apply intelligence (modulation) to an rf-carrier wave. Carriermodulation allows the transmission of modulating frequencies without the use of transmission wire as amedium. However, for the communication process to be completed or to be useful, the intelligence mustbe recovered in its original form at the receiving site. The process of re-creating original modulatingfrequencies (intelligence) from the rf carrier is referred to as DEMODULATION or DETECTION.

telephone headset or a loudspeaker. Consider the heterodyne reception of the code letter A, as shown in figure 3-3, view (A). The code consists of a short burst of cw energy (dot) followed by a longer burst (dash). Assume that the frequency of the received cw signal is 500 kilohertz. The locally generated oscillations are adjusted to a frequency

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