中国邮电高校学报(英文) ›› 2012, Vol. 19 ›› Issue (6): 118-122.doi: 10.1016/S1005-8885(11)60326-9

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Fully integrated low phase noise multi-band LC-tank voltage controlled oscillator with switched-capacitor resonator

李斌1,樊祥宁2,王志功3   

  1. School of Information Science and Engineering, Southeast University, Nanjing 210096, China
  • 收稿日期:2012-03-26 修回日期:2012-09-23 出版日期:2012-12-31 发布日期:2012-12-14
  • 通讯作者: 樊祥宁 E-mail:xnfan@seu.edu.cn
  • 基金资助:

    This work was supported by the Project of the State Key Development Program for Basic Research of China (2010CB327404).

Fully integrated low phase noise multi-band LC-tank voltage controlled oscillator with switched-capacitor resonator

  1. School of Information Science and Engineering, Southeast University, Nanjing 210096, China
  • Received:2012-03-26 Revised:2012-09-23 Online:2012-12-31 Published:2012-12-14
  • Contact: Xiangning Fan E-mail:xnfan@seu.edu.cn
  • Supported by:

    This work was supported by the Project of the State Key Development Program for Basic Research of China (2010CB327404).

摘要:

This paper presents the design and implementation of a fully integrated low noise multi-band LC-tank voltage-controlled-oscillator (VCO). Multi-band operation is achieved by using switched-capacitor resonator. Additional three-bit binary weighted capacitor array is also used to extend frequency tuning range in each band. To lower phase noise, two noise filters are added and a linear varactor is adopted. Implemented in a 0.18 μm complementary-metal- oxide-semiconductor (CMOS) process, the VCO achieves a frequency tuning range covering 2.26~2.48 GHz, 2.48~ 2.78 GHz, 2.94~3.38 GHz, and 3.45~4.23 GHz while occupies a chip area of 0.52 mm2. With a 1.8 V power supply, it draws a current of 10.9 mA, 10.6 mA, 8.8 mA, and 6.2 mA from the lowest band to the highest band respectively. The measured phase noise is 109~ 120 dBc/Hz and 121~ 131 dBc/Hz at a 1 MHz and 2.5 MHz offset from the carrier, respectively.

关键词:

VCO, multi-band, phase noise, linear varactor, CMOS

Abstract:

This paper presents the design and implementation of a fully integrated low noise multi-band LC-tank voltage-controlled-oscillator (VCO). Multi-band operation is achieved by using switched-capacitor resonator. Additional three-bit binary weighted capacitor array is also used to extend frequency tuning range in each band. To lower phase noise, two noise filters are added and a linear varactor is adopted. Implemented in a 0.18 μm complementary-metal- oxide-semiconductor (CMOS) process, the VCO achieves a frequency tuning range covering 2.26~2.48 GHz, 2.48~ 2.78 GHz, 2.94~3.38 GHz, and 3.45~4.23 GHz while occupies a chip area of 0.52 mm2. With a 1.8 V power supply, it draws a current of 10.9 mA, 10.6 mA, 8.8 mA, and 6.2 mA from the lowest band to the highest band respectively. The measured phase noise is 109~ 120 dBc/Hz and 121~ 131 dBc/Hz at a 1 MHz and 2.5 MHz offset from the carrier, respectively.

Key words:

VCO, multi-band, phase noise, linear varactor, CMOS

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