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A time-domain digitally controlled oscillator composed of a free running ring oscillator and flying-adder

Liu Wei, Li Wei, Ren Peng, Lin Qinglong, Zhang Shengdong and Wang Yangyuan

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Abstract: A time-domain digitally controlled oscillator (DCO) is proposed. The DCO is composed of a free-running ring oscillator (FRO) and a two lap-selectors integrated flying-adder (FA). With a coiled cell array which allows uniform loading capacitances of the delay cells, the FRO produces 32 outputs with consistent tap spacing for the FA as reference clocks. The FA uses the outputs from the FRO to generate the output of the DCO according to the control number, resulting in a linear dependence of the output period, instead of the frequency on the digital controlling word input. Thus the proposed DCO ensures a good conversion linearity in a time-domain, and is suitable for time-domain all-digital phase locked loop applications. The DCO was implemented in a standard 0.13 μm digital logic CMOS process. The measurement results show that the DCO has a linear and monotonic tuning curve with gain variation of less than 10%, and a very low root mean square period jitter of 9.3 ps in the output clocks. The DCO works well at supply voltages ranging from 0.6 to 1.2 V, and consumes 4 mW of power with 500 MHz frequency output at 1.2 V supply voltage.

Key words: all-digital phase-locked loops

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    Received: 18 August 2015 Revised: 29 April 2009 Online: Published: 01 September 2009

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      Liu Wei, Li Wei, Ren Peng, Lin Qinglong, Zhang Shengdong, Wang Yangyuan. A time-domain digitally controlled oscillator composed of a free running ring oscillator and flying-adder[J]. Journal of Semiconductors, 2009, 30(9): 095004. doi: 10.1088/1674-4926/30/9/095004 Liu W, Li W, Ren P, Lin Q L, Zhang S D, Wang Y Y. A time-domain digitally controlled oscillator composed of a free running ring oscillator and flying-adder[J]. J. Semicond., 2009, 30(9): 095004. doi: 10.1088/1674-4926/30/9/095004.Export: BibTex EndNote
      Citation:
      Liu Wei, Li Wei, Ren Peng, Lin Qinglong, Zhang Shengdong, Wang Yangyuan. A time-domain digitally controlled oscillator composed of a free running ring oscillator and flying-adder[J]. Journal of Semiconductors, 2009, 30(9): 095004. doi: 10.1088/1674-4926/30/9/095004

      Liu W, Li W, Ren P, Lin Q L, Zhang S D, Wang Y Y. A time-domain digitally controlled oscillator composed of a free running ring oscillator and flying-adder[J]. J. Semicond., 2009, 30(9): 095004. doi: 10.1088/1674-4926/30/9/095004.
      Export: BibTex EndNote

      A time-domain digitally controlled oscillator composed of a free running ring oscillator and flying-adder

      doi: 10.1088/1674-4926/30/9/095004
      • Received Date: 2015-08-18
      • Accepted Date: 2009-03-12
      • Revised Date: 2009-04-29
      • Published Date: 2009-08-28

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