UHF RFID读写器中低噪声宽带VCO的设计  

A Low Phase Noise and Wide-band VCO for UHF RFID Reader

作　　者：张启帆[1] 王建伟[1] 石春琦[1] 张润曦[1] 

机构地区：[1]华东师范大学微电子电路与系统研究所,上海200062

出　　处：《固体电子学研究与进展》2015年第2期150-155,共6页Research & Progress of SSE

基　　金：国家自然科学基金资助项目(61306034;61302005);华东师范大学科创基金资助项目(78210082)

摘　　要：基于0.18μm CMOS工艺,设计了一款可用于UHF RFID读写器的低相位噪声、宽带的压控振荡器(VCO)。使用全集成、低输出噪声和高电源抑制比(PSRR)的低压差线性稳压器(LDO)为VCO供电;采用4bit电阻偏置型开关电容阵列拓宽了频带,减少了寄生二极管引入的损耗,有效提升了VCO的相位噪声性能。测试结果表明:LDO输出2.5V电压的条件下,整个电路消耗电流为4.8mA时,压控振荡器的输出频率可在3.12GHz至4.21GHz(增幅30.5%)的范围内变化。在载波3.6GHz频偏200kHz和1 MHz时相位噪声分别为:-109.9dBc/Hz和-129dBc/Hz。Based on the 0.18μm CMOS process,a low phase noise voltage-controlled oscillator（VCO）with wide-band for UHF RFID reader was presented.The VCO was supplied by a fully integrated low-output-noise and high power supply rejection ratio（PSRR）low-dropout linear regulator（LDO）.To widen the output frequency range,a 4bit resistor-biased switch capacitor array（SCA）was used.The resistor-biased switch capacitor reduced losses introduced by the parasitic diodes and improved the VCO phase noise performance.Measurement results show that：the whole circuit consumes a current of about 4.8 mA with 2.5Vpower supply of LDO.The output frequency of VCO could change from 3.12 GHz to 4.21GHz（increase by 30.5%）.The circuit achieves a phase noise of-109.9dBc/Hz at 200 kHz offset and-129dBc/Hz at 1 MHz offset with the 3.6GHz center frequency.

关 键 词：压控振荡器 宽摆幅 低噪声 开关电容阵列 

分 类 号：TN752[电子电信—电路与系统] TN431.2