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设计了一种新型的低相位噪声低功耗Colpitts正交压控振荡器(QVCO)。此QVCO采用电流开关技术降低相位噪声,采用跨导增强技术改善核心电路的起振条件,并基于器件重用技术实现电路的反向注入锁定。提出的Colpitts QVCO比交叉耦合LC VCO的相位噪声更低,并且比传统QVCO的相位噪声、正交相位精度以及调谐范围的性能更优。最终基于0.18μm CMOS工艺流片实现的Colpitts QVCO在1.5 V工作电压下,功耗为0.9 m W,振荡频率为4.8~5.6 GHz,调谐范围高达15.4%,在中心振荡频率5.2 GHz处的相位噪声为-115.8 d Bc/Hz@1 MHz,正交相位误差为0.3°,此QVCO的芯片面积为0.5 mm×1 mm。
A novel low phase noise low power Colpitts Quadrature Voltage Controlled Oscillator (QVCO) is designed. The QVCO uses current switching technology to reduce phase noise, transconductance enhancement technology to improve the core circuit of the start-up conditions, and based on device reuse technology to achieve the reverse injection of the circuit lock. The proposed Colpitts QVCO has lower phase noise than cross-coupled LC VCOs and better performance than the traditional QVCO’s phase noise, quadrature phase accuracy and tuning range. Finally, based on a 0.18μm CMOS process chip, the Colpitts QVCO consumes 0.9 mW at a 1.5 V operating voltage, oscillating at 4.8-5.6 GHz with a tuning range of up to 15.4% and phase noise at a center frequency of 5.2 GHz Is -115.8 d Bc / Hz @ 1 MHz, the quadrature phase error is 0.3 °, and the chip area of this QVCO is 0.5 mm × 1 mm.