一种高精度低温漂振荡器设计

Design of a High-precise and Low-temperature-drift Oscillator

针对无线通信和微机械传感器系统对时钟相位噪声的要求,设计了一种高精度低温漂的振荡器电路设计。利用Leeson线形相位噪声模型分析相位噪声,降低了主要噪声源,达到优化相位噪声的目的。该电路在华润上华0.18μm工艺平台上流片验证。测试结果显示,电源电压在2.2~3.6 V变化,温度在-35~85℃变化,频率变化为-2%^+0.5%;相位噪声-116 d Bc@1 k Hz;4 000个周期的抖动在-1.2%^+1.2%。该电路已成功集成到微机械陀螺仪控制芯片中。

According to the requirement of clock phase noise of wireless communication and micro mechanical sensor system design,the design of a high precision low temperature drift oscillator circuit. Analysis of phase noise using Leeson linear phase noise model,reduce the main noise source,to optimize the phase noise of the objective. The circuit is taped out in Huarun China 0. 18 μm technology platform. Test results show that the power supply voltage from 3. 6 V changes and temperature from the change of-35 ~ 85 ℃,the frequency change-2% ~ 0. 5%; phase noise-116 d Bc@ 1 k Hz; 4 000 cycle jitter at-1. 2% ~ ＋ 1. 2%. The circuit is successfully integrated into the micro mechanical gyroscope control chip.