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

作者：Wang, Xiaofeng; Wang, Zhiyu; Li, Haoming; Tian, Rongqian; Liu, Jiarui^*; Yu, Faxin

来源：Informacije Midem-Journal of Microelectronics Electronic Components and Materials, 2017, 47(4): 247-253.

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

Based on TSMC 0.18 mu m 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.

• 出版日期2017-12
• 单位浙江大学