| 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.
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A wideband LC-VCO with small VCO gain variation and adaptive power control
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.-
Keywords:
- LC-VCO
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References
[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] -
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