基于自注入耦合技术的超低相位噪声QVCO

An Ultra-Low-Phase Noise Quadrature Voltage-Controlled Oscillator Based on Self-Injection-Coupled Technique

基于标准0.18μm CMOS工艺,提出并验证了一种改进的用于多相位振荡器的耦合方法。将一种先进的自注入耦合(SIC)技术,用于耦合两个电流复用差分压控振荡器(VCO)。相比较于传统的并联耦合正交VCO(QVCO)而言,所提出的采用SIC技术的QVCO在没有增加功耗的前提下,表现出了更低的相位噪声。所提出的SIC-QVCO在16.41GHz振荡频率下,相位噪声为-119.7dBc/Hz@1MHz,并且调谐范围高达1.66GHz,直流电源电压和电流分别为1.8V和5.28mA,芯片尺寸为0.3mm×0.9mm。

An improved coupled method for multiphase oscillator is proposed and demonstrated in a standard 0.18/~m CMOS technology. A self-injection-coupling （SIC） technique is used to couple two current- reused differential voltage-controlled oscillators （VCOs）. Compared with the conventional parallel-coupled quadrature VCO （QVCO）, the proposed QVCO using the SIC technique presents low phase noise without in- creasing dc power consumption. At the oscillating frequency of 16.41 GHz, the proposed SIC-QVCO shows a low phase noise of --119.7 dBc/Hz at 1-MHz offset frequency and a tuning range of 1.66 G Hz. The dc supply voltage and current consumption are 1.8 V and 5.28 mA respectively. The chip size of the proposed SIC-QV- CO is 0.3 mm×0.9 mm.