J. Semicond. > 2012, Volume 33 > Issue 10 > 105008

SEMICONDUCTOR INTEGRATED CIRCUITS

A wideband LC-VCO with small VCO gain variation and adaptive power control

Li Bin, Fan Xiangning and Wang Zhigong

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DOI: 10.1088/1674-4926/33/10/105008

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Abstract: A wideband LC tank voltage-controlled-oscillator (VCO) is proposed. To solve the impacts of wideband operation on VCO gain (KVCO) variation and start-up constraint, a binary-weighted varactor array and a binary-weighted negative resistance array all with optimal unit values are designed. Implemented in a 0.18 μm CMOS process, the proposed VCO shows a frequency tuning range from 1.9 to 3.1 GHz, with a current consumption varying accordingly from 14.2 to 4 mA from a 1.8 V supply. With the proposed KVCO suppression technique, the KVCO varies from 50 to 60 MHz/V in the entire frequency range. The measured phase noise is -117 dBc/Hz at a 1 MHz offset from a 3 GHz carrier.

Key words: LC-VCO

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    Received: 20 August 2015 Revised: 06 May 2012 Online: Published: 01 October 2012

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      Li Bin, Fan Xiangning, Wang Zhigong. A wideband LC-VCO with small VCO gain variation and adaptive power control[J]. Journal of Semiconductors, 2012, 33(10): 105008. doi: 10.1088/1674-4926/33/10/105008 ****Li B, Fan X N, Wang Z G. A wideband LC-VCO with small VCO gain variation and adaptive power control[J]. J. Semicond., 2012, 33(10): 105008. doi: 10.1088/1674-4926/33/10/105008.
      Citation:
      Li Bin, Fan Xiangning, Wang Zhigong. A wideband LC-VCO with small VCO gain variation and adaptive power control[J]. Journal of Semiconductors, 2012, 33(10): 105008. doi: 10.1088/1674-4926/33/10/105008 ****
      Li B, Fan X N, Wang Z G. A wideband LC-VCO with small VCO gain variation and adaptive power control[J]. J. Semicond., 2012, 33(10): 105008. doi: 10.1088/1674-4926/33/10/105008.

      A wideband LC-VCO with small VCO gain variation and adaptive power control

      DOI: 10.1088/1674-4926/33/10/105008
      Funds:

      The National Basic Research Program of China (973 Program)

      • Received Date: 2015-08-20
      • Accepted Date: 2012-03-20
      • Revised Date: 2012-05-06
      • Published Date: 2012-09-10

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