A 16 MHz, 59.2 ppm/A degrees C CMOS DLL-Assisted VCO with Improved Frequency Stability Towards Single Chip Wireless IOT
A 16 MHz, 59.2 ppm/A degrees C CMOS DLL-Assisted VCO with Improved Frequency Stability Towards Single Chip Wireless IOT
复制标题
16 MHz、59.2 ppm/A°C CMOS DLL 辅助 VCO，具有针对单芯片无线 IOT 的更高频率稳定性
DOI：
10.1007/s11036-016-0716-6
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Yu Hang
中科院分区：
文献类型：
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作者：
Li Yan;Zhen Cao;Liu Shaohua;Jiang Lai;Yu Hang
报道了一种16 MHz、高稳定的压控振荡器(VCO)。所提出的压控振荡器由三个交叉耦合RC级组成，并且完全兼容标准的CMOS工艺。设计中采用了负温度系数的正偏置PN结来补偿频率漂移。此外，还利用紧跟压控振荡器的延迟锁定环(DLL)进一步提高了温度变化引起的输出稳定性。设计的电路采用CMOS0.18μm工艺实现，并通过实验验证。测试结果表明，在25~120℃温度范围内，动态链接库辅助压控振荡器的输出变化小于0.56%，相当于59.2ppm/°C。与没有动态链接库辅助的相同压控振荡器相比，动态链接库辅助的压控振荡器的输出标准偏差仅为6.816 kHz，提高了~16.6%。
A 16 MHz, highly stable voltage controlled oscillator (VCO) is reported in this paper. The proposed VCO consists of three cross-coupled RC stages, and is fully compatible with standard CMOS process. A positively biased PN junction with negative temperature coefficient is incorporated in the design to compensate frequency drift. In addition, a delay locked loop (DLL) directly following the VCO is utilized to further improve the output stability caused by temperature variations. The designed circuit was implemented using CMOS 0.18 μm technology, and was validated through experiments. Measurement results show that the DLL-assisted VCO output variation across the 25~120 °C temperature range is less than 0.56 %, corresponding to 59.2 ppm/°C. It also shows that the output standard deviation of the DLL-assisted VCO is only 6.816 KHz, ~ 16.6 % better compared with the same VCO without DLL’s assistance.