Sharif Digital Repository

Direct digital synthesizers (DDS) are one type of frequency synthesizer that are used for creating arbitrary waveforms from a reference clock with fixed-frequency and have various applications in signal generators, local oscillators in telecommunication systems, mixers, modulators and part of phase-locked loop.Despite of numerous advantages of direct digital synthesizers like high accuracy, fast switching ability, low power consumption and etc, beacuse of some available alternative errors in its structure like phase truncation, Inside band of desired output signal, independent unwanted signals namely spur were created. Spurs creat trouble in the use of sensor or radar systems and limit the...