文档介绍：上海交通大学
硕士学位论文
CMOS 电感电容压控振荡器设计
姓名:毛懿鸿
申请学位级别:硕士
专业:软件工程(集成电路设计方向)
指导教师:周健军
20080101
上海交通大学工程硕士学位论文
CMOS 电感电容压控振荡器设计
摘要
全球定位系统(Global Positioning System, GPS)广泛用于交通导航
以及手机定位等方面,而其便携式和手持化的需求使 GPS 接收机前端芯
片具有相当大的应用价值。
频率合成器是无线接收机中的重要模块,而压控振荡器作为频率合
成器的核心电路,其功耗和输出相位噪声直接影响到整个系统的性能,
是接收机的设计难点。由于大规模数字集成电路的制造通常采用 CMOS
工艺,因此 CMOS 压控振荡器是 GPS 接收机芯片的研究重点。
针对压控振荡器在制造时存在的工艺偏差以及温度、电源电压对输
出频率的影响,可以采用频带选择电路对其调谐范围进行扩展,并能够
在初始频率偏差较大的情况下减小频率合成器的锁定时间,并且不会增
加振荡器增益而使输出相位噪声性能变差。
本文采用的研究方法是先对设计的电路进行理论分析和模型建立,
并使用仿真工具对电路进行验证和优化。
仿真结果表明,本文中设计的压控振荡器电路能够满足 GPS 系统指
标,并具有较低的功耗。
关键词:电感电容压控振荡器,频带选择,相位噪声,全球定位系统
上海交通大学工程硕士学位论文
CMOS LC VOLTAGE-CONTROLLED
OSCILLATOR
ABSTRACT
Global Positioning System has been widely used in positioning of
vehicles and cellular phones. These portable applications can be realized by
wireless receiver front-end chipset.
Frequency synthesizer is one of the most important modules in receiver
system and its performance on power consumption and output phase noise is
mostly dependent on voltage-controlled oscillator. As most of the large-scale
digital integrated circuits are fabricated in CMOS process, CMOS receiver
front-end system has also e more and more popular so that it can be
integrated with digital circuits. Thus, CMOS voltage-controlled oscillator
es the key point in receiver front-end design.
A VCO core circuit for GPS receiver is presented in this thesis. Because
the output frequency of VCO may change due to process mismatch in
fabrication as well as temperature and power supply, a switch capacitor array
for coursing tuning is also included in the VCO to increase the tuning range
without increasing the VCO’s tuning gain, which will degrade the noise
performance of frequency synthesizer, and to reduce the setting time in case
of large initial phase error. Coarse calibration logic is also designed, not only
for GPS, but also for further rese