采用PMOS底部电流源的低功耗电流自调整压控振荡器

This paper presents the design and implementation of a current self-adjusted VCO with low power consumption. In the proposed VCO, a bottom PMOS current source instead of a top one is adopted to decrease the tail noise. A current self-adjusted technique without additional external control signals is taken to ensure the VCO starts up in the whole band while keeping the power consumption relatively low. Meanwhile, the phase noise of the VCO at the low frequency （high Cvar） can be reduced by the technique. The circuit is implemented in 0.18 μm CMOS technology. The proposed VCO exhibits low power consumption of 〈1.6 mW at a 1.5 V supply voltage and a tuning range from 11.79 to 12.53 GHz. The measured phase noise at 1 MHz offset from the frequency 11.79 GHz is-104.7 dBc/Hz, and the corresponding FOM is -184.2 dBc/Hz.     

基于模糊理论的原有道路结构性能评价方法

从三分法的基本原理出发,建立了原有道路结构性能的模糊综合评价模型,并将其应用于实际工程的道路结构性能评价.最后将评价结论与常规的线性加权法的结果进行了对比分析,表明应用模糊评价模型的评价结论更加符合实际情况,值得推广.