COMPARISON OF SIGMA-DELTA MODULATOR FOR FRACTIONAL-N PLL FREQUENCY SYNTHESIZER

• 作 者: Mao Xiaojian Yang Huazhong Wan
• 机 构: DepartmentofElectronicEngineering
• 出 处: 电子科学学刊：英文版
• 发表日期: 2007年3期
• 关键词: 频率合成器 非整数锁相回路 Σ-Δ调制器 比较研究 Fractional-N Frequency synthesizer Phase Locked Loop
• 基金项目: Supported in part by the National Natural Science Foundation of China （No. 60025101, No.90207001, and No. 90307016）.

This paper investigates the design of digital Sigma-Delta Modulator (SDM) for fractional-N frequency synthesizer. Characteristics of SDMs are compared through theory analysis and simulation. The curve of maximum-loop-bandwidth vs. maximum-phase-noise is s