| Citation: |
Xiao Shimao, Ma Chengyan, Ye Tianchun. A novel 2.95–3.65 GHz CMOS LC-VCO using tuning curve compensation[J]. Journal of Semiconductors, 2009, 30(10): 105001. doi: 10.1088/1674-4926/30/10/105001
Xiao S M, Ma C Y, Ye T C. A novel 2.95–3.65 GHz CMOS LC-VCO using tuning curve compensation[J]. J. Semicond., 2009, 30(10): 105001. doi: 10.1088/1674-4926/30/10/105001.
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A novel 2.95–3.65 GHz CMOS LC-VCO using tuning curve compensation
doi: 10.1088/1674-4926/30/10/105001
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Abstract
This paper presents a new CMOS LC-VCO with a 2.95–3.65 GHz tuning range. The large tuning range is achieved by tuning curve compensation using a novel varactor configuration, which is mainly composed of four accumulation-mode MOS varactors (A-MOS) and two bias voltages. The proposed varactor has the advantages of optimizing quality factor and tuning range simultaneously, linearizing the effective capacitance and thus greatly reducing the amplitude-to-phase modulation (AM-PM) conversion. The circuit is validated by simulations and fabricated in a standard 0.18 μm 1P6M CMOS process. Measured phase noise is lower than –91 dBc at 100 kHz offset from a 3.15 GHz carrier while measured tuning range is 21.5% as the control voltage varies from 0 to 1.8 V. The VCO including buffers consumes 2.8 mA current from a 1.8 V supply.-
Keywords:
- CMOS,
- A-MOS,
- voltage-controlled oscillator
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References
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Proportional views
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