一种低相位噪声的正交电感电容压控振荡器的设计  

Design of a low phase noise quadrature LC voltage-controlled oscillator

作　　者：罗永双 赵唯辰 林福江[1] Luo Yongshuang;Zhao Weichen;Lin Fujiang(School of Information Science and Technology,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学技术大学信息科学技术学院,安徽合肥230026

出　　处：《信息技术与网络安全》2020年第5期58-62,共5页Information Technology and Network Security

摘　　要：在相同的功耗下,串联耦合正交电感电容压控振荡器相位噪声性能优于并联耦合电感电容压控振荡器。但是在传统的串联耦合正交电感电容压控振荡器中,LC谐振腔中存在45°的相位偏移使得其相位噪声被恶化。因此提出一种交流偏置的串联耦合正交电感电容压控振荡器。该振荡器中的LC谐振腔的相移接近0°,并且耦合MOS管的低频噪声上变频的相位噪声部分受到抑制。所以该交流偏置的串联耦合正交电感电容压控振荡器可以获得较好的相位噪声性能。所提出的正交电感电容压控振荡器在TSMC 180 nm CMOS工艺下设计完成。其输出频率调谐范围为2.34 GHz^2.60 GHz,电源电压为1.8 V,功耗约为11.2 mW。输出频率为2.58 GHz时,3 MHz频偏处的相位噪声为-140.1 dBc/Hz,相较于传统串联耦合正交振荡器优化了6.4 dB。该振荡器的品质因子为188.3 dBc/Hz,平均相位误差为0.05°。Series-coupled quadrature LC voltage-controlled oscillator(SQVCO)has a better phase noise performance than parallel-coupled quadrature LC voltage-controlled oscillator(PQVCO)with the same power dissipation.But the phase noise of the conventional SQVCO is deteriorated because of a 45°phase shift in the LC resonator.An ac-biased SQVCO is proposed in this paper.Phase shift in the LC resonator of the proposed SQVCO is close to 0°.Besides,the upconversion of the flicker noise of the coupling MOS transistors to phase noise is suppressed.Thus the proposed ac-biased SQVCO can achieve an excellent phase noise performance.A 2.34 GHz^2.60 GHz proposed SQVCO is designed in TSMC 180 nm CMOS process.The average power dissipation is about 11.2 mW under 1.8 V supply voltage.The phase noise at 3 MHz offset from 2.58 GHz is-140.1 dBc/Hz,which is 6.4 dB lower than that of the conventional SQVCO.And the figure-of-merit(FoM)of it is 188.3 dBc/Hz.The average phase error is 0.05°.

关 键 词：CMOS集成电路 正交压控振荡器 相位噪声 相位误差 低频噪声 

分 类 号：TN432[电子电信—微电子学与固体电子学]