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Page 1Fernando FigueroaWeek 3 AM Receiver Short PaperECT 263DeVry University Professor Robert Ziccardi
Page 2AM ReceiverThe most conventional receivers operated today are the super heterodyne type. They commonlyconsist of Antenna, RF amplifier, Local Oscillator and Mixer, IF Section, & Detector and Amplifier. The necessity for these subsystems can be comprehended when one contemplates the simple and inadequate tuned radio frequency amplifier. The system is set up to receive and detect an Amplitude Modulated Signal. An Amplitude Modulation system alters the amplitude of the carrier in step to the amplitude transforms a modulating signal. The difference in the amplitude of the signal is the intellect, while the carrier is used to communicate the information. The most straightforward system of the receiver and aids to show the basic blocks and their function. The way in which the receiver works can be seen by following the signal as it distributes through the receiver. Front end amplifier and tuning blocksignals insert the front-end circuitry from the antenna. This circuit block performs two main functions. The local oscillator may consist of a variable frequency oscillator that can be tuned by altering the setting on a variable capacitor. Alternatively, it may be a frequency synthesizer that will enable greater levels of stability and setting accuracy. When the signals leave the mixer, they enter the IF stages. These stages contain most of the amplification in the receiver as well as the filtering that enables signals on one frequency to be separated from those on the next. Filters may consist simply of LC tuned