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This article presents a novel multimode cascaded frequency division structure for a low‐spur wide‐bandwidth fractional‐N frequency synthesizer. In order to reduce fractional spur, the new ∆‐∑ modulators are designed as a three‐order structure and each of them is composed of a three‐bit three‐order hybrid feedback ∆‐∑ modulator. Besides, a mixing phase‐locked loop structure is designed to effectively...
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