Abstract

A low phase noise CMOS LC VCO (Voltage controlled oscillator) for UHF RFID (Radio Frequency Identification) reader is designed. The quadrature output differential signal is achieved through Source-Coupled-Logic frequency divider-by-two circuit. The circuit is implemented with the SMIC 0.18um MOS technology and the simulator of Cadence SpectreRF. The simulation results show that the frequency range of VCO is from 1620MHz to 2020MHz before frequency divider and phase noise of −127.5dBc/Hz at 1MHz offset at oscillation frequency of 1.8GHz. The frequency rang of VCO is from 810MHz to 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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