SEMICONDUCTOR INTEGRATED CIRCUITS
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
| 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
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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.
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