Abstract
This chapter discusses demodulators as the purpose of a detector or demodulator circuit is to recover the intelligence impressed on the radio carrier wave at the transmitter. They are also sometimes called second detectors in superheterodyne receivers. In a superheterodyne receiver the detector or demodulator circuit is placed between the IF amplifier and the audio amplifier. This position is the same in AM, FM, pulse modulation, and digital receivers although in digital receivers the demodulator might be in a circuit called a modem. The chapter further explains many types of detectors, such as AM envelope doctors, double sideband and single sideband suppresses carrier demodulators, and FM/PM detectors.
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