【摘要】 设计了一个应用于超宽带脉冲无线电(IR-UWB)通信系统的数控环形振荡器(DCRO).DCRO采用3调谐,包括电压粗调谐和开关变容管精调谐,逐级提高调谐精度.提出了一种新型延时单元,采用多环路结构,提高了环形振荡器的振荡频率,降低了功耗.设计采用CSMC 0.18μm互补金属氧化物半导体工艺,电源电压1.8V,使用SpectreRF仿真验证,数控环形振荡器的调谐范围为3～8.6GHz,调谐精度为2MHz,当工作频率在8.6GHz时,偏离主频10MHz处相位噪声为-112.4dBc/Hz,功耗为20mW.更多还原

【Abstract】 In this paper,a digitally controlled ring oscillator(DCRO) for ultra-wideband impulse radio(IR-UWB) communication system is presented.Three-stage tuning method is applied in the DCRO,including coarse voltage tuning and fine switched varactor tuning.A novel delay cell is proposed and multiple-loop architecture is utilized for ring oscillator,allowing to obtain high operation frequency and low power consumption.Under CSMC 0.18μm CMOS process,when the supply voltage is 1.8V,the DCRO has a wide frequency tuning range from 3 to 8.6GHz and a frequency resolution of 2MHz.At 8.6GHz,the circuit achieves a phase noises of-112.4dBc/Hz at 10MHz offset.The total power consumption is 20mW.更多还原