一种高分辨率∑△小数分频频率合成器  

A High Resolution Sigma-Delta Fractional-N Frequency Synthesizer

作　　者：郭桂良[1] 杜占坤[1] 高海军[1] 杨洪文[1] 易青[1] 朱思奇[1] 阎跃鹏[1] 

机构地区：[1]中国科学院微电子研究所电子系统总体技术研究室,北京100029

出　　处：《固体电子学研究与进展》2009年第4期515-519,共5页Research & Progress of SSE

摘　　要：提出了一种采用新型分频器的小数分频频率合成器。该频率合成器与传统的小数分频频率合成器相比具有稳定时间快、工作频率高和频率分辨率高的优点。设计基于TSMC0.25μm2.5V1P5MCMOS工艺,采用sig-ma-delta调制的方法实现。经测量得到该频率合器工作频率在2.400～2.850GHz之间,相位噪声低于-95dBc/Hz@100kHz,最小频率步进小于30Hz,开关时间小于50μs,满足多数无线通信系统的要求。A fractional-N frequency synthesizer with novel dividers is proposed. Compared with traditional fractional-N frequency synthesizer, the design shows good performance of fast settling time, high resolution with maximum working frequencies. The fractional-N frequency synthesizer with 3-order sigma-delta modulator is realized in TSMC 0.25 t^m 2.5 V CMOS pro- cess. The working frequency is between 2. 400 GHz to 2. 850 GHz. The measured phase noise is lower than -95 dBc/Hz at 100 kHz offset, with ultra-small step size less than 30 Hz and the switching time of less than 30 μs, which meets the requirements for most wireless communication systems.

关 键 词：∑-△调制器 小数分频频率合成器 噪声整形 分频器 

分 类 号：TN742[电子电信—电路与系统]