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在研究电流复用(CR)压控振荡器(VCO)中的振幅补偿技术的基础上,提出了一种改进的自发式跨导匹配(m-STM)技术。由于CR VCO结构的非对称性,难免导致两个差分输出振荡幅度的不平衡。相比较于传统的STM技术,m-STM技术消耗的净空电压更低,因而更适合于低电压工作。基于0.18μm RF CMOS工艺,对该VCO进行了设计与芯片实现,测试结果表明本文所设计实现VCO取得了2.05~2.68GHz的宽振荡频率范围,调谐范围高达26.3%,并且在2.4GHz载频处,相位噪声低至-117.6dBc/Hz@1MHz,而电路仅消耗了0.8mW的功耗。
Based on the study of the amplitude compensation technique in current-controlled (CR) voltage-controlled oscillators (VCOs), an improved spontaneous transconductance matching (m-STM) technique is proposed. Due to the asymmetry of the CR VCO structure, it is inevitable that the amplitude of the two differential outputs will be unbalanced. Compared to the traditional STM technology, m-STM technology consumes less headroom and is therefore more suitable for low-voltage operation. Based on the 0.18μm RF CMOS process, the VCO is designed and implemented. The test results show that the designed VCO achieves a wide oscillation frequency range of 2.05 ~ 2.68GHz with a tuning range of up to 26.3% and a 2.4GHz carrier frequency , Phase noise as low as -117.6dBc / Hz@1MHz, while the circuit consumes only 0.8mW of power.