4. Direct digital synthesis
The principle of the digital direct synthesizer (DDS) is shown in figure 15 .
The output of the R-bit phase accumulator addresses a ROM (read-only memory) containing an M-bit tabulated representation of the sine function. This ROM converts the phase information produced by the accumulator into a digital value representing the signal amplitude. An S-bit digital-to-analog converter (DAC) then translates this digital value to deliver the analog signal of frequency ν S = (n/d)ν E with d = 2 R . The signal obtained corresponds to the sampling of the ideal...
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Direct digital synthesis
Direct analog synthesis
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