AM/FM radio receiver
Radio receivers receive radio signals from local radio stations that transmit their signal over an assigned frequency at a prescribed power level. Amplitude modulated (AM) radio transmission is the oldest and simplest form of modulation. In AM radios, the amplitude of the carrier wave is made to vary corresponding to the fluctuations of a sound wave, a television image, or other information which is to be conveyed. The FM (frequency modulation) radio frequency band typically extends from about 87 to 104 MHz. In FM stereo radio reception, a broadcast FM stereo signal is decoded or demodulated to produce right and left channel audio outputs. Commercial AM and FM broadcast bands include a plurality of evenly spaced channels. A particular broadcast station is allocated a unique channel to conduct broadcasting within an assigned frequency range. With the development of integrated circuits (IC), both AM and FM radio circuits have been integrated into one chip. Radio receiver systems having a plurality of receivers for different radio frequencies, also known as multichannel radio receivers, are fed from one common antenna or a plurality of antennas, each of which is individually assigned to one of the plurality of receivers. Radio receivers having optional AM operation (amplitude modulation) and FM operation (frequency modulation) may have both AM and FM preselector stages downstream from a common preselection filter at the antenna input. The AM preselector stage includes an AM high frequency (HF) selection circuit and the FM preselector stage includes at least one FM HF selection circuit. In a dual-band radio receiver, such as an AM/FM receiver, separate processing components must be maintained for each separate broadcast band being received.
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