低相噪、低功耗连续调谐双核压控振荡器  

Low phase nosie and low power consumption continuous tuning dual-core voltage-controlled oscillator

作　　者：李英男 Li Yingnan(School of Microelectronics,Tianjin University,Tianjin,300072,China)

机构地区：[1]天津大学微电子学院,天津300072

出　　处：《南京大学学报（自然科学版）》2020年第2期290-295,共6页Journal of Nanjing University（Natural Science）

摘　　要：采用GF 55 nm CMOS工艺,设计一种可应用于调频连续波(Frequency Modulated Continuous Wave,FMCW)雷达系统中的低相噪、低功耗连续调谐双核电感电容压控振荡器(Voltage-Controlled Oscillator,VCO).该VCO通过三线圈变压器将两个振荡核心和缓冲放大器相互耦合.通过双核耦合结构实现了低相位噪声,同时也保证了较宽的连续频率调谐范围.采用电流复用技术,将缓冲放大器通过中心抽头变压器与核心电路耦合,大幅降低了由双核结构引起的高功耗,同时为电路提供了较高的输出功率,解决了双核耦合VCO的质量因数(Figure of Merit,FoM)普遍较差的问题.后仿结果表明,该VCO实现了28 G^32 GHz的13%的连续频率调谐范围,相位噪声在1 MHz偏移下低至-105 dBc·Hz-1.在1. 2 V电源电压下,包括缓冲放大器在内的总直流功耗仅为13. 5 mW,输出功率可达4. 5 dBm.电路实现了183 dBc·Hz-1的FoM.A low phase noise and low power consumption continuous tuning dual-core inductor-capacitive voltage-controlled oscillator(VCO) for Frequency Modulated Continuous Wave(FMCW) radar system is designed in GF 55 nm CMOS technology. The VCO couples the two oscillating cores and the buffer amplifier to each other through a three-coil transformer. Low phase noise is achieved by dual core operation with a wide continuous frequency tuning range. In order to reduce the high power consumption caused by the dual cores and provide high output power, we adopt center-tapped transformer and current reused technique to integrate cross couple pair and buffer amplifier. This circuit solves the problem of generally poor figure of merit(FoM) of dual-core coupled VCO. The post-simulation result shows that the VCO achieves a13% continuous tuning range from 28 G^32 GHz,and the phase noise is as low as-105 dBc·Hz-1 at 1 MHz offset. Total dc power consumption including buffer amplifier is only 13.5 mW for 1.2 V supplied voltage. The peak output power is 4.5 dBm. The circuit achieves a FoM of 183 dBc·Hz-1.

关 键 词：压控振荡器 双核 电流复用 变压器 

分 类 号：TN722.5[电子电信—电路与系统]