Abstract
This paper proposes a method to improve the phase noise of a X-band sweep source. It is based on a PLL(Phase-locked loop) circuit driven by a DDS(Direct Digital Synthesizer), and an offset source is introduced in the PLL circuit. The DDS is used to generate low-frequency sweep signal, the PLL circuit is used to multiply the low-frequency sweep signal, and the offset is introduced to decrease the phase noise. This method decreases the phase noise of the sweep source greatly.
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