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A low-phase-noise ring oscillator with coarse and fine tuning in a standard CMOS process

Gao Haijun, Sun Lingling, Kuang Xiaofei and Lou Liheng

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Abstract: A low-phase-noise wideband ring oscillator with coarse and fine tuning techniques implemented in a standard 65 nm CMOS process is presented. Direct frequency modulation in the ring oscillator is analyzed and a switched capacitor array is introduced to produce the lower VCO gain required to suppress this effect. A two-dimensional high-density stacked MOM-capacitor was adopted as the switched capacitor to make the proposed ring VCO compatible with standard CMOS processes. The designed ring VCO exhibits an output frequency from 480 to 1100 MHz, resulting in a tuning range of 78%, and the measured phase noise is --120 dBc/Hz @ 1 MHz at 495 MHz output. The VCO core consumes 3.84 mW under a 1.2 V supply voltage and the corresponding FOM is --169 dBc/Hz.

Key words: ring oscillatorswitched capacitor arrayphase noiseMOM-capacitorstandard CMOS

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    Received: 20 August 2015 Revised: 04 April 2012 Online: Published: 01 July 2012

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      Gao Haijun, Sun Lingling, Kuang Xiaofei, Lou Liheng. A low-phase-noise ring oscillator with coarse and fine tuning in a standard CMOS process[J]. Journal of Semiconductors, 2012, 33(7): 075004. doi: 10.1088/1674-4926/33/7/075004 Gao H J, Sun L L, Kuang X F, Lou L H. A low-phase-noise ring oscillator with coarse and fine tuning in a standard CMOS process[J]. J. Semicond., 2012, 33(7): 075004. doi: 10.1088/1674-4926/33/7/075004.Export: BibTex EndNote
      Citation:
      Gao Haijun, Sun Lingling, Kuang Xiaofei, Lou Liheng. A low-phase-noise ring oscillator with coarse and fine tuning in a standard CMOS process[J]. Journal of Semiconductors, 2012, 33(7): 075004. doi: 10.1088/1674-4926/33/7/075004

      Gao H J, Sun L L, Kuang X F, Lou L H. A low-phase-noise ring oscillator with coarse and fine tuning in a standard CMOS process[J]. J. Semicond., 2012, 33(7): 075004. doi: 10.1088/1674-4926/33/7/075004.
      Export: BibTex EndNote

      A low-phase-noise ring oscillator with coarse and fine tuning in a standard CMOS process

      doi: 10.1088/1674-4926/33/7/075004
      Funds:

      The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

      The National Basic Research Program of China (973 Program)

      • Received Date: 2015-08-20
      • Accepted Date: 2012-02-27
      • Revised Date: 2012-04-04
      • Published Date: 2012-06-27

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