Transcription of a APPLICATION NOTE AN-543 - Analog Devices
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a APPLICATION NOTE AN-543 - Analog Devices
AAN-543 APPLICATION NOTEOne Technology Way Box 9106 Norwood, MA 02062-9106 781/329-4700 World Wide Web Site: following describes the implementation of a highquality all-digital FM RF generator for use with audio fre-quency input signals. The FM RF signal output is in thebroadcast FM band and can be monaural or modulators have been with us since the time ofMajor Edwin H. Armstrong (sometimes known as thefather of FM) and his classic 1936 paper on the first put down on paper the fundamental concept of afixed center frequency that is varied per a constant de-viation ratio that is independent of the frequency of themodulating signal. FM became very popular becausemuch of the noise generated in nature exhibits AM char-acteristics. The signal-to-noise ratio of an FM signal willbe found to exceed that of an AM signal due to the im-provement ratio related to the deviation ratio. We are allfamiliar with the wideband FM broadcast band and itssuperior sound quality and noise immunity when com-pared with AM FM modulators typically employ an oscillatorwith a varactor diode in the tuned circuit.
–2– AN-543 The EZ-KIT Lite contains an Analog Devices ADSP-2181 KS-133 16-bit DSP with 16K × 24 of program memory RAM and 16K × 16 of data memory RAM.
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