应用dds技术可实现相位连续的快速频率切换。
DDS technology can switch frequency fastly in phase continuous.
模块中的相位累加器，使系统具有较高的频率分辨率，可实现快速频率切换，很容易实现频率、相位和幅度的数控调制，有广泛的应用价值。
The phase adder in the model is widely applied which could enable system to hold high frequency revolution, fast frequency switching, and easily digital modulating of the signal's phase and amplitude.
现代无线通信要求频率综合器同时满足快速切换时间，小信道宽度和低噪声性能三方面的要求。
Modern wireless communication requires that the frequency synthesizer should have fast settling time, small channel width and low phase noise.
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