UHF RFID阅读器中线性化调谐增益压控振荡器设计

Design of Voltage Controlled Oscillator with Linearized Tuning-Gain for UHF RFID Transceiver IC

基于标准0.18μm RF-CMOS工艺,实现了一个可应用于UHF RFID阅读器的低相位噪声、线性化调谐增益(KVCO)、恒定子带间距的压控振荡器。该振荡器包括开关变容管阵列和开关电容阵列,实现了调谐增益线性化及子带间距恒定化。仿真结果表明,当压控振荡器在1.52GHz至2.16 GHz(35.5%)的频率范围变化时,调谐增益从40 MHz/V变化到51 MHz/V(21.5%),子带间距变化为34 MHz到51 MHz,相位噪声在1.8GHz时为-133.8dBc/Hz@1MHz。在低压差线性稳压器(LDO)输出电压为2.5V的条件下,整个电路消耗电流约5.2mA。

Based on standard 0.18 μm RF-CMOS process,a low phase noise VCO with linearized tuning-gain and constant bandwidth for UHF RFID reader was presented.Switched varactor array（SVA） and switched capacitor array（SCA） were introduced to realize tuning-gain linearization and constant bandwidth.Simulation results showed that,for frequencies varying from 1.52 GHz to 2.16 GHz（35.5%）,the VCO had a tuning gain from 40 MHz/V to 51 MHz/V（21.5%）,a bandwidth varying from 34 MHz to 51 MHz and a phase noise of-133.8 dBc/Hz at 1 MHz offset from 1.8 GHz operating frequency.The whole circuit consumed a current of about 5.2 mA from a 2.5 V LDO biased power supply.