基于CMOS工艺的低相位噪声LC压控振荡器

A Low Phase-Noise LC voltage Controlled Oscillator in CMOS Technology

介绍了一种用于锁相环型频率合成器的单片集成LC压控振荡器。该压控振荡器在传统的电路结构基础上进行了改进，在保证调谐范围的前提下，有效地降低了相位噪声。压控振荡器使用了片上集成螺旋电感，采用中芯国际（SMIC）0．35μm 1P6M混合信号CMOS工艺。测试结果表明，该压控振荡器的可调频率为303．55GHz，在3．55GHz中心频率附近的相位噪声达到-128dBe／Hz（600kHz），整个压控振荡器的工作电压为3．3V，工作电流为13mA。

A monolithic LC voltage controlled oscillator （VCO） for PLL frequency synthesizer is presented. On designing the VCO, several optimizations have been added to the traditional circuit architecture, which efficiently reduces phase noise on the basis of sufficient tuning range. Using on-chip spiral inductors, the VCO was implemented in SMIC＇s 0. 35μm 1P6M mixed-signal CMOS technology. Measured results show that the VCO has a tunable frequency of 3 GHz to 3. 55 GHz. Phase noise in the vicinity of the center frequency （3. 55 GHz） reaches -128 dBc/ Hz at 600 kHz offset. The VCO operates under a supply voltage of 3. 3 V and consumes 13 mA of current.