SEMICONDUCTOR INTEGRATED CIRCUITS

A low-power and low-phase-noise LC digitally controlled oscillator featuring a novel capacitor bank

Tian Huanhuan, Li Zhiqiang, Chen Pufeng, Wu Rufei and Zhang Haiying

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Abstract: A monolithic low-power and low-phase-noise digitally controlled oscillator (DCO) based on a symmetric spiral inductor with center-tap and novel capacitor bank was implemented in a 0.18 μm cmos process with six metal layers. A third new way to change capacitance is proposed and implemented in this work. Results show that the phase noise at 1 MHz offset frequency is below –122.5 dBc/Hz while drawing a current of only 4.8 mA from a 1.8 V supply. Also, the DCO can work at low supply voltage conditions with a 1.6 V power supply and 4.1 mA supply current for the DCO's core circuit, achieving a phase-noise of –121.5 dBc/Hz at offset of 1 MHz. It demonstrates that the supply pushing of DCO is less than 10 MHz/V.

Key words: digitally controlled oscillator

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    Received: 18 August 2015 Revised: 30 July 2010 Online: Published: 01 December 2010

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      Tian Huanhuan, Li Zhiqiang, Chen Pufeng, Wu Rufei, Zhang Haiying. A low-power and low-phase-noise LC digitally controlled oscillator featuring a novel capacitor bank[J]. Journal of Semiconductors, 2010, 31(12): 125003. doi: 10.1088/1674-4926/31/12/125003 Tian H H, Li Z Q, Chen P F, Wu R F, Zhang H Y. A low-power and low-phase-noise LC digitally controlled oscillator featuring a novel capacitor bank[J]. J. Semicond., 2010, 31(12): 125003. doi:  10.1088/1674-4926/31/12/125003.Export: BibTex EndNote
      Citation:
      Tian Huanhuan, Li Zhiqiang, Chen Pufeng, Wu Rufei, Zhang Haiying. A low-power and low-phase-noise LC digitally controlled oscillator featuring a novel capacitor bank[J]. Journal of Semiconductors, 2010, 31(12): 125003. doi: 10.1088/1674-4926/31/12/125003

      Tian H H, Li Z Q, Chen P F, Wu R F, Zhang H Y. A low-power and low-phase-noise LC digitally controlled oscillator featuring a novel capacitor bank[J]. J. Semicond., 2010, 31(12): 125003. doi:  10.1088/1674-4926/31/12/125003.
      Export: BibTex EndNote

      A low-power and low-phase-noise LC digitally controlled oscillator featuring a novel capacitor bank

      doi: 10.1088/1674-4926/31/12/125003
      • Received Date: 2015-08-18
      • Accepted Date: 2010-04-11
      • Revised Date: 2010-07-30
      • Published Date: 2010-11-25

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