To tune in an am broadcast station operating at a

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Unformatted text preview: plication than is needed for this fairly simple and straightforward problem!] Antenna IFband ­passfilter andamplifierfor kHz RFfilterand amplifier Audiodetectorand amplifier Speaker (adjustable) Figure 5: Structure of a typical radio receiver. Practical radio receivers typically use several stages in their demodulation process, in order to manage various design tradeoffs. The baseband signal in AM is allowed to carry frequencies in the range of −5 kHz to 5 kHz, which is adequate for music and speech. To tune in an AM broadcast station operating at a carrier frequency of fc kHz, we would like to select from the “radio frequency” (RF) signal picked up by the antenna only those frequencies in the ranges fc ± 5 kHz and −fc ± 5 kHz, as no other parts of the received signal are relevant. This would require building a very good bandpass filter for the antenna signal to go through, but the pass band of the filter would have to be shifted around in frequency as we tuned from one station to another — and this turns out to be...
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This document was uploaded on 03/17/2014 for the course ELECTRICAL 6.02 at MIT.

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