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 Delta Sigma Enhanced, Low SFDR, Area Efficient Digital FM Modulator - مرکز دانلود ایران میکرو

Delta Sigma Enhanced, Low SFDR, Area Efficient Digital FM Modulator

In this paper, a new low SFDR digital frequency modulator is presented. For high frequency resolution and performance, the design is based on a
12- bit phase value direct digital synthesizer (DDS). The DDS is enhanced by a one-bit second order digital delta sigma modulator to achieve high SFDR by reduction of the spur coming from phase truncation. This modulator removes the periodic phase truncation errors by noise shaping and dithering. For Area efficiency, the area of look up table ROM is highly reduced by using compression algorithms and quarter phase symmetry of sinusoidal signals

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