摘要
运用负阻模型分析石英晶体振荡器,设计实现了一种用于数字电视接收芯片的数控石英晶体振荡器(DCXO)。该DCXO采用Pierce结构,利用基带与振荡器的反馈环路产生的6位自动频率控制信号对振荡器的频率漂移进行校准,得到长期稳定的频率输出。电路采用TSMC混合/RF0.13μm CMOS工艺实现,中心频率为24MHz。在1.2V电源电压下的仿真结果显示:数控范围72×10-6@24MHz,调节精度1×10-6/step,启动时间约900μs,振荡器振荡峰值为0.8V;在偏离中心频率1kHz和10kHz处的相位噪声分别为-141dBc和-155dBc。该振荡器除石英晶体外,均集成在片内。
A digitally controlled crystal oscillator （DCXO） in digital TV receiver IC was designed. In this DCXO, Pierce architecture was adopted, in which frequency drift was corrected by 6-bit automatic frequency control signal generated by feedback loop of the base-band and oscillator to obtain a long-term stable frequency output. Results from simulation based on TSMC＇s mixed/RF 0. 13μm CMOS process showed that the oscillator had a tuning range of 72×10^-6 at 24 MHz, a frequency step per AFC code of 1×10^-6 , a start-up time of about 900 9s, and a peak-to- peak oscillation amplitude of 0. 8 V; and the phase noise of the circuit at 1 kHz and 10 kHz were -141 dBc and -155 dBc, respectively. The DCXO were all integrated into a digital TV receiver IC, except the quartz crystal.
出处
《微电子学》
CAS
CSCD
北大核心
2009年第3期367-370,共4页
Microelectronics
基金
科技部科技型中小企业技术创新基金(07C26223201317)
教育部新世纪优秀人才支持计划(NCET-06-0484)
江苏省自然科学基金(BK2007026)资助项目
关键词
负阻模型
数控晶体振荡器
自动频率控制
Negative resistance model
Digitally-controlled crystal oscillator
Automatic frequency control
