Direct Digital Synthesizer with an On-Chip D/A-Converter
Traditional designs of high bandwidth frequency synthesizers employ the use of the PLL. The DDS provides many significant advantages over PLL approaches. Fast settling time, sub-Hertz frequency resolution, continuous-phase switching response and low phase noise are features easily obtainable in DDS systems. Although the principle of the DDS has been known for many years [Tie71], the DDS did not play a dominant role in wideband frequency generation until recently. Earlier DDSs were limited to producing narrow bands of closely spaced frequencies, due to limitations of digital logic and D/A-converter technologies. Recent advantages in integrated circuit (IC) technologies have brought about remarkable process in this area.
KeywordsPhase Noise Clock Frequency Phase Accumulator CORDIC Algorithm Spurious Free Dynamic Range
Unable to display preview. Download preview PDF.