应用于WSN的0.5V 4.8GHz CMOS LC VCO设计

0.5 V 4.8 GHz CMOS LC VCO for WSN application

为设计一个可应用于无线传感网的0.5V4.8GHz CMOS LC压控振荡器,采用传统差分负阻结构的电感电容VCO核心电路,添加开关电容阵列增大VCO的调谐范围,利用升压电路和反相器的组合提高控制信号产生电路的性能,通过调节负阻管的宽长比等方法来优化VCO的相位噪声性能,保证VCO能在0.5V的低供电电压下稳定工作,相位噪声达到-119.3dBc/Hz@1MHz,VCO的频率调谐范围为4.3～5.3GHz,相位噪声小于-115dBc/Hz@1 MHz,最低可达-121.2dBc/Hz@1 MHz,核心电路电流约为2.6mA,满足无线传感网的应用要求。

A 0.5 V 4.8 GHz CMOS LC VCO for WSN application was designed. The VCO uses traditional differential negative-resistance structure. With a switched capacitor array, VCO achieves a large tuning range. Thanks to the combination of voltage-boosting circuit, VCO can have a control voltage larger than the supply voltage. Several technologies like width-length-ratio-adjusting of the transistors were used to optimize phase noise performance. The VCO uses 0. 13μm CMOS technology. The proposed VCO achieves a phase noise less than --115 dBc/Hz@1MHz, and --121.2 dBc/Hz at most and consumes about 2.6 mA core current at 0.5 voltage supply. The performance of VCO meets the requirement of the design target.