| Citation: |
Xu Conghui, Xi Jingtian, Lu Lei, Yang Yuqing, Tan Xi, Yan Na, Min Hao. A 4.2–5 GHz, low phase noise LC-VCO with constant bandwidth and small tuning gain[J]. Journal of Semiconductors, 2009, 30(9): 095002. doi: 10.1088/1674-4926/30/9/095002
Xu C H, Xi J T, Lu L, Yang Y Q, Tan X, Yan N, Min H. A 4.2–5 GHz, low phase noise LC-VCO with constant bandwidth and small tuning gain[J]. J. Semicond., 2009, 30(9): 095002. doi: 10.1088/1674-4926/30/9/095002.
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A 4.2–5 GHz, low phase noise LC-VCO with constant bandwidth and small tuning gain
doi: 10.1088/1674-4926/30/9/095002
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Abstract
As the tuning frequency of an integrated LC-voltage controlled oscillator (LC-VCO) increases, it is difficult to co-design the active negative resistance core and the varactor to achieve wideband frequency range, low phase noise, constant bandwidth and small tuning gain together. The presented VCO solves the problem by designing a set of changeable varactor units. The whole VCO was implemented in a 0.18 μm CMOS process. The measured result shows –120 dBc/Hz phase noise at 1 MHz offset. The measured tuning range is from 4.2 to 5 GHz and the tuning gain is 8–10 MHz/V. The VCO draws 4 mA from a 1.5 V supply voltage.-
Keywords:
- VCO
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Proportional views
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