术是继直接频率合成和间接频率合成之后，随着数字集成电路和微电子技术的发展而迅速发展起来的第三代频率合成技术。DDS技术具有相对带宽宽、频-operation is the direct and indirect frequency synthesizer frequency synthesis, With digital integrated circuits and microelectronic technology development and the rapid development of the third generation of frequency synthesis technology. DDS technology is relatively wide bandwidth, frequency