应用于UHF RFID阅读器中低相位噪声LC VCO设计
Design of a Low-Phase-Noise LC VCO for UHF RFID Reader
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摘要: 设计了一种应用于860~960MHz UHF RFID阅读器低相位噪声的CMOS LC压控振荡器.电路经过一个SCL结构的1/2分频器输出四相正交信号.电路设计采用SMIC 0.18μm CMOS工艺库和Cadence SpectreRF仿真器.仿真结果表明:VCO在分频前,实现了调频范围为1620~2020MHz;在振荡频率为1.8GHz时,相位噪声为-127.5dBc/Hz@1MHz;VCO经过2分频电路后,实现了调频范围为810~1010MHz;在频率900MHz,其相位噪声-133.5dBc/Hz@1MHz.Abstract: A low phase noise CMOS LC Voltage Controlled Oscillator for 860~960MHz UHF RFID (Radio Frequency Identification) reader is designed.The quadrature output differential signal is achieved through SCL (Source-Coupled Logic) frequency divider by two.The circuit is implemented with the SMIC 0.18μm CMOS technology and the simulator of Cadence SpectreRF.The simulation results show the frequency range from 1620~2020MHz before frequency divider and phase noise of-127.5dBc/Hz@1MHz offset at oscillation frequency of 1.8GHz.VCO has the frequency rang from 810~1010MHz after frequency divider by two and the phase noise of-133.5dBc/Hz@1MHz offset at the frequency of 900MHz.
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