| A Design of X band Frequency Hopping Synthesizer using DDS Spurious Reduction Method |
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Kun-Sup Kwon |
| DDS 불요파 제거 알고리즘을 이용한 X 대역 주파수 도약 합성기 설계 |
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권건섭 |
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국방과학연구소 |
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| Abstract |
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In this paper we propose a design method of X band frequency hopping synthesizer in terms of phase noise and settling time with DDS driven PLL architecture, which has the advantages of high frequency resolution, fast settling time and small size. In addition, a noble method is proposed to remove the synthesizer output spurious signals due to superposition effect of DDS. The spurious signal which depend on its normalized frequency of DDS, can be dominant if they occur within the PLL loop bandwidth. We verify that the sources of that spurious signals are quasi-amplitude modulation and superposition effect, and suggest that such signals can be eliminated by intentionally creating frequency errors in the developed synthesizer. |
| Key Words:
DDS, Phase Noise, Settling Time, Superposition Effect, PLL |
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