1.6GHz24位4阶2-$小数分频频率合成器.PDF

36 5 Vol1 36, l 5 2006 10 Micr oelectr onics O t1 2006 1.6 GHz 2442-$ 黄 进, 皇甫红军, 张 兴, 黄 如 ( , 518055) : 介绍了一种3 V 0. 35 Lm BiCM OS 工艺实现的1. 6 GHz 小数分频频率合成器它采用 新 的24 位4 阶2- $ 调制结构数字调制器, 以减少频率合成器的带内相位噪声锁定频率切换时 间, 在获得高达20 MH z 鉴相频率的同时, 能达到小于1 Hz 的频率分辨率仿真结果表明, 它的锁 定范围是1. 615~ 1. 675 GHz, 环路带宽100 kHz, 带内相位噪声低于- 90 dB / Hz, 锁定频率切换 时间小于25 Ls, 可以很好地满足 个人手持电话系统PHS 标准的应用该电路功耗为20 mW, 芯 片面积1. 7 mm @ 0. 8 mm, 其中, 2- $ 调制部分所占面积为1 mm @ 0. 4 mm : 2- $ 调制; 小数分频; 频率合成器; 鉴频器; 环路滤波器 : T N402; T N74 : A : 1004-3365( 2006) 05-0683-05 A 1.6 GHz Fractiona-l NFrequencySynthesizer witha24-b th 4 -Order 2-$ odulator HUANG Jin, HUA NGFU Hong-jun, ZHANG Xing, HUANG Ru ( S he nz h en Gra duat e Sc hool, P ek ing Univ . , S he nz h en, G uang dong 518055, P. R. Chi na) Abstract: A 1. 6 GHz 2- $ fra tional-n frequen y synthesizer is presented, whi h is implemented in 3- V 0. 35-Lm BiCMOS pro ess. A novel 24-b fourth-order 2- $ modulator is employ ed to a hieve low in-band phase-noise, agile sw it hing, and fine frequen y resolut ion less than 1 H z with 20 M Hz referen e frequen y has been a hieved. Simula- tion results show that the proposed system has a rapid sw it hing time of 25 Ls, whi h meets the requirements of the personal mobile system( PH S) standard. The synthesizer has a 1. 8% frequen y tuning range from 1. 615 GH z to 1. 645 GH z. It dissipates 20 mW of pow er and o upies an a tive area of 1. 7 mm @ 0. 8 mm in luding 1 mm @ 0. 4 mm 2-