An Improved Low Phase Noise LC-VCO with Wide Frequency Tuning Range Used in CPPLL

Xiaofeng Wang, Zhiyu Wang, Haoming Li, Rongqian Tian, Jiarui Liu, Faxin Yu


Based on TSMC 0.18μm CMOS process, a complementary cross-coupled differential LC voltage controlled oscillator (LC-VCO) used in charge pump phase-locked loop (CPPLL) frequency synthesizer for satellite receiver with low phase noise and wide frequency tuning range is designed and implemented. The VCO adopts self-bias structure to remove flicker noise produced by tail current. Programmable LC tanks are introduced at the common source of cross-couple transistors to eliminate second harmonics of resonant frequency. Distributed biasing is applied for a wider linear tuning range. An optimized switch is proposed to lower on-resistance. The measured results show that the VCO exhibits a 53.8% tuning range from 1.02GHz to 1.77GHz. From the carrier frequency of 1.4 GHz, the phase noise of the VCO can reach -131.2 dBc/Hz at 1MHz offset. The core circuit consumes 7.7mA with 1.8V supply voltage.


low phase noise, wide tuning range, distributed biasing, optimized switch

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